0001110805-22-000008 | 10-K | XBRL Viewer

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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 5,637	$ 153,625
Accounts receivable	135,126	133,473
Inventories	16,644	11,059
Prepaid and other current assets	27,135	25,400
Total current assets	184,542	323,557
Property, plant and equipment, at cost	5,728,848	6,164,742
Accumulated depreciation and amortization	(2,187,206)	(2,207,230)
Property, plant and equipment, net	3,541,642	3,957,512
Intangible assets, net	557,785	630,209
Goodwill	732,356	766,416
Other long-term assets, net	140,007	139,324
Total assets	5,156,332	5,817,018
Current liabilities:
Accounts payable	82,446	71,731
Current portion of finance lease obligations	3,848	3,839
Accrued interest payable	34,139	50,847
Accrued liabilities	79,818	77,770
Taxes other than income tax	14,475	16,998
Total current liabilities	214,726	221,185
Long-term debt, less current portion	3,183,555	3,593,496
Deferred income tax liability	11,831	13,011
Other long-term liabilities	147,956	157,825
Total liabilities	3,558,068	3,985,517
Commitments and contingencies (Note 14)
Series D preferred limited partners (23,246,650 units outstanding as of December 31, 2021 and 2020) (Note 17)	616,439	599,542
Partners’ equity (Note 18):
Common limited partners (109,986,273 and 109,468,127 common units outstanding as of December 31, 2021 and 2020, respectively)	299,502	572,314
Accumulated other comprehensive loss	(73,978)	(96,656)
Total partners' equity	981,825	1,231,959
Total liabilities, mezzanine equity and partners' equity	5,156,332	5,817,018
Series A Preferred Limited Partner [Member]
Partners’ equity (Note 18):
Preferred limited partners	218,307	218,307
Series B Preferred Limited Partner [Member]
Partners’ equity (Note 18):
Preferred limited partners	371,476	371,476
Series C Preferred Limited Partner [Member]
Partners’ equity (Note 18):
Preferred limited partners	$ 166,518	$ 166,518

CONSOLIDATED BALANCE SHEETS (parenthetical) - shares	Dec. 31, 2021	Dec. 31, 2020	Jul. 13, 2018	Jun. 29, 2018
Series D preferred units outstanding	23,246,650	23,246,650	7,486,209	15,760,441
Limited partners common units outstanding	109,986,273	109,468,127
Series A Preferred Limited Partner [Member]
Preferred units outstanding	9,060,000	9,060,000
Series B Preferred Limited Partner [Member]
Preferred units outstanding	15,400,000	15,400,000
Series C Preferred Limited Partner [Member]
Preferred units outstanding	6,900,000	6,900,000

CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Total revenues	$ 1,618,500	$ 1,481,564	$ 1,498,021
Costs and expenses:
Asset impairment losses	154,908	0	0
Goodwill impairment loss	34,060	225,000	0
General and administrative expenses (excluding depreciation and amortization expense)	113,207	102,716	107,855
Other depreciation and amortization expense	7,792	8,625	8,360
Total costs and expenses	1,382,046	1,272,462	1,107,105
Operating income	236,454	209,102	390,916
Interest expense, net	(213,985)	(229,054)	(183,070)
Loss on extinguishment of debt	0	(141,746)	0
Other income (expense), net	19,644	(34,622)	3,742
Income (loss) from continuing operations before income tax expense (benefit)	42,113	(196,320)	211,588
Income tax expense	3,888	2,663	4,754
Income (loss) from continuing operations, net of tax	38,225	(198,983)	206,834
Income (loss) from discontinued operations, net of tax	0	0	(312,527)
Net income (loss)	$ 38,225	$ (198,983)	$ (105,693)
Basic net income (loss) per common unit (Note 19)
Continuing operations	$ (0.99)	$ (3.15)	$ 0.60
Discontinued operations	0	0	(2.90)
Total net income (loss) per common unit	(0.99)	(3.15)	(2.30)
Diluted net income (loss) per common unit (Note 19)
Continuing operations	(0.99)	(3.15)	0.60
Discontinued operations	0	0	(2.90)
Total net income (loss) per common unit	$ (0.99)	$ (3.15)	$ (2.30)
Basic weighted-average common units outstanding	109,585,635	109,155,117	107,789,030
Diluted weighted-average common units outstanding	109,585,635	109,155,117	107,854,699
Service [Member]
Revenues:
Total revenues	$ 1,157,410	$ 1,205,494	$ 1,148,167
Costs and expenses:
Operating expenses (excluding depreciation and amortization expense)	388,078	403,579	404,682
Depreciation and amortization expense	266,588	276,476	264,564
Total costs associated with service revenues/Cost associated with product sales	654,666	680,055	669,246
Product [Member]
Revenues:
Total revenues	461,090	276,070	349,854
Costs and expenses:
Total costs associated with service revenues/Cost associated with product sales	$ 417,413	$ 256,066	$ 321,644

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income (loss)	$ 38,225	$ (198,983)	$ (105,693)
Other comprehensive income (loss):
Foreign currency translation adjustment	601	1,410	3,527
Net gain (loss) on pension and other postretirement benefit adjustments, net of income tax (expense) benefit of ($61), $28 and $14	16,413	(4,144)	(1,314)
Change in unrealized loss on cash flow hedges	0	(30,291)	(19,045)
Reclassification of loss on cash flow hedges to interest expense, net	5,664	4,265	3,814
Total other comprehensive income (loss)	22,678	(28,760)	(13,018)
Comprehensive income (loss)	$ 60,903	$ (227,743)	$ (118,711)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Income tax (expense) benefit	$ (61)	$ 28	$ 14

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income (loss)	$ 38,225	$ (198,983)	$ (105,693)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	274,380	285,101	281,460
Amortization of unit-based compensation	14,209	11,477	14,386
Amortization of debt related items	12,490	11,463	5,209
(Gain) loss from sale or disposition of assets	(61)	38,084	3,499
Gain from insurance recoveries	(14,860)	0	0
Asset and goodwill impairment losses	188,968	225,000	336,838
Loss on extinguishment of debt	0	141,746	0
Deferred income tax (benefit) expense	(1,369)	212	(476)
Changes in current assets and current liabilities (Note 20)	(14,147)	11,928	(44,765)
Decrease (increase) in other long-term assets	9,867	(8,101)	22,020
(Decrease) increase in other long-term liabilities	(6,636)	7,920	(1,407)
Other, net	412	151	(2,314)
Net cash provided by operating activities	501,478	525,998	508,757
Cash Flows from Investing Activities:
Capital expenditures	(181,133)	(198,079)	(533,568)
Change in accounts payable related to capital expenditures	1,264	(10,645)	(12,731)
Proceeds from insurance recoveries	9,372	0	0
Proceeds from sale or disposition of assets	246,475	110,640	228,152
Other, net	0	0	(1,100)
Net cash (used in) provided by investing activities	75,978	(98,084)	(319,247)
Cash Flows from Financing Activities:
Proceeds from Term Loan, net of discount and issuance costs	0	463,045	0
Proceeds from note offerings, net of issuance costs	0	1,182,035	491,580
Proceeds from other long-term debt borrowings	977,000	883,748	659,300
Proceeds from short-term debt borrowings	0	52,000	307,500
Term Loan repayment, including debt extinguishment costs	0	(601,316)	0
Other long-term debt repayments	(1,389,700)	(1,813,963)	(928,900)
Short-term debt repayments	0	(57,500)	(320,500)
Proceeds from issuance of common units	0	0	15,000
Distributions to preferred unitholders	(127,551)	(124,622)	(121,693)
Distributions to common unitholders	(175,263)	(196,203)	(258,354)
Proceeds from (payments for) termination of interest rate swaps	0	(49,225)	0
Payment of tax withholding for unit-based compensation	(3,384)	(10,028)	(8,771)
Decrease in cash book overdrafts	(142)	(2,288)	(3,752)
Other, net	(6,539)	(17,067)	(9,060)
Net cash provided by (used in) financing activities	(725,579)	(291,384)	(177,650)
Effect of foreign exchange rate changes on cash	136	916	(524)
Net increase (decrease) in cash, cash equivalents and restricted cash	(147,987)	137,446	11,336
Cash, cash equivalents and restricted cash as of the beginning of the period	162,426	24,980	13,644
Cash, cash equivalents and restricted cash as of the end of the period	$ 14,439	$ 162,426	$ 24,980

CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY AND MEZZANINE EQUITY - USD ($) $ in Thousands	Total	Accumulated Other Comprehensive Loss [Member]	Preferred Limited Partner [Member]	Common Limited Partner [Member]	Series D Preferred Limited Partner [Member]
Partners' capital - beginning balance at Dec. 31, 2018	$ 2,257,731	$ (54,878)	$ 756,301	$ 1,556,308
Temporary equity - beginning balance at Dec. 31, 2018	563,992
Partners' capital and temporary equity - beginning balance at Dec. 31, 2018	2,821,723
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	(105,693)	0	64,134	(227,386)
Net income (loss), excluding portion attributable to temporary equity	(163,252)
Net income, temporary equity					$ 57,559
Other comprehensive income (loss)	(13,018)	(13,018)	0	0
Cash distributions to partners			(64,134)	(258,354)
Distributions to partners, temporary equity					(57,559)
Issuance of units	15,000	0		15,000
Unit-based compensation	20,766	0	0	20,766
Series D Preferred Unit accretion, common	(18,085)			(18,085)
Series D Preferred Unit accretion, preferred					18,085
Series D Preferred Unit accretion, total	0
Other	(444)	0	0	(444)
Other, temporary equity					(142)
Other, including temporary equity	(586)
Partners' capital - ending balance at Dec. 31, 2019	1,776,210	(67,896)	756,301	1,087,805
Temporary equity - ending balance at Dec. 31, 2019	581,935
Partners' capital and temporary equity - ending balance at Dec. 31, 2019	2,358,145
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	(198,983)	0	64,134	(323,865)
Net income (loss), excluding portion attributable to temporary equity	(259,731)
Net income, temporary equity					60,748
Other comprehensive income (loss)	(28,760)	(28,760)	0	0
Cash distributions to partners			(64,134)	(196,203)
Distributions to partners, temporary equity					(60,748)
Unit-based compensation	22,219	0	0	22,219
Series D Preferred Unit accretion, common	(17,626)			(17,626)
Series D Preferred Unit accretion, preferred					17,626
Series D Preferred Unit accretion, total	0
Other	(16)	0	0	(16)
Other, temporary equity					(19)
Other, including temporary equity	(35)
Partners' capital - ending balance at Dec. 31, 2020	1,231,959	(96,656)	756,301	572,314
Temporary equity - ending balance at Dec. 31, 2020	599,542
Partners' capital and temporary equity - ending balance at Dec. 31, 2020	1,831,501
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	38,225	0	63,982	(89,174)
Net income (loss), excluding portion attributable to temporary equity	(25,192)
Net income, temporary equity					63,417
Other comprehensive income (loss)	22,678	22,678	0	0
Cash distributions to partners			(63,982)	(175,263)
Distributions to partners, temporary equity					(63,417)
Unit-based compensation	8,528	0	0	8,528
Series D Preferred Unit accretion, common	(16,903)			(16,903)
Series D Preferred Unit accretion, preferred					16,903
Series D Preferred Unit accretion, total	0
Other	0	0	0	0
Other, temporary equity					$ (6)
Other, including temporary equity	(6)
Partners' capital - ending balance at Dec. 31, 2021	981,825	$ (73,978)	$ 756,301	$ 299,502
Temporary equity - ending balance at Dec. 31, 2021	616,439
Partners' capital and temporary equity - ending balance at Dec. 31, 2021	$ 1,598,264

CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY AND MEZZANINE EQUITY (parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Limited Partner [Member]
Cash distributions paid, per unit	$ 1.60	$ 1.80	$ 2.40

ORGANIZATION AND OPERATIONS	12 Months Ended
ORGANIZATION AND OPERATIONS	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION AND OPERATIONS	ORGANIZATION AND OPERATIONS Organization NuStar Energy L.P. (NYSE: NS) is a Delaware limited partnership primarily engaged in the transportation, terminalling and storage of petroleum products and renewable fuels and the transportation of anhydrous ammonia. Unless otherwise indicated, the terms “NuStar Energy,” “NS,” “the Partnership,” “we,” “our” and “us” are used in this report to refer to NuStar Energy L.P., to one or more of our consolidated subsidiaries or to all of them taken as a whole. Our business is managed under the direction of the board of directors of NuStar GP, LLC, the general partner of our general partner, Riverwalk Logistics, L.P., both of which are indirectly wholly owned subsidiaries of ours. Operations We conduct our operations through our subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). We have three business segments: pipeline, storage and fuels marketing. Pipeline. We own 3,205 miles of refined product pipelines and 2,230 miles of crude oil pipelines, as well as 5.6 million barrels of crude oil storage capacity, which comprise our Central West System. In addition, we own 2,500 miles of refined product pipelines, consisting of the East and North Pipelines, and a 2,000-mile ammonia pipeline, which comprise our Central East System. The East and North Pipelines have storage capacity of 7.4 million barrels. We charge tariffs on a per barrel basis for transporting refined products, crude oil and other feedstocks in our refined product and crude oil pipelines and on a per ton basis for transporting anhydrous ammonia in the Ammonia Pipeline. Storage. We own terminal and storage facilities in the United States, Canada and Mexico, with 44.2 million barrels of storage capacity. Our terminal and storage facilities provide storage, handling and other services on a fee basis for refined products, crude oil, specialty chemicals, renewable fuels and other liquids. Fuels Marketing. The fuels marketing segment includes our bunkering operations in the Gulf Coast, as well as certain of our blending operations associated with our Central East System. Recent Developments Point Tupper Terminal Sale Agreement. On February 11, 2022, we entered into an agreement to sell the equity interests in our wholly owned subsidiaries that own our Point Tupper terminal facility to EverWind Fuels for $60.0 million. The terminal facility has a storage capacity of 7.8 million barrels and is included in the storage segment. We expect to complete the sale in the first half of 2022 and will utilize the sales proceeds to improve our debt metrics. Please refer to Note 25 for more information. Debt Amendments. On January 28, 2022, we amended and restated our $1.0 billion unsecured revolving credit agreement to extend the maturity to April 27, 2025, replace the LIBOR-based interest rate and modify other terms. Also on January 28, 2022, we amended our $100.0 million receivables financing agreement to extend the scheduled termination date to January 31, 2025, replace the LIBOR-based interest rate and modify other terms. Please refer to Note 12 for more information. Eastern U.S. Terminals Disposition. On October 8, 2021, we completed the sale of nine U.S. terminal and storage facilities, including all our North East Terminals and one terminal in Florida (the Eastern U.S. Terminal Operations) to Sunoco LP for $250.0 million in cash (the Eastern U.S. Terminals Disposition). We recorded asset and goodwill impairment losses of $95.7 million and $34.1 million, respectively, in the third quarter of 2021. Please see Note 4 for further discussion. Houston Pipeline Impairment. In the third quarter of 2021, we recorded a long-lived asset impairment charge of $59.2 million related to the southern section of our Houston refined product pipeline. Please see Note 4 for further discussion. Senior Notes. On November 1, 2021, we repaid our $250.0 million of 4.75% senior notes due February 1, 2022 with proceeds from the Eastern U.S. Terminals Disposition. On February 1, 2021 we repaid our $300.0 million of 6.75% senior notes at maturity with borrowings under our Revolving Credit Agreement. Other Events Selby Terminal Fire. On October 15, 2019, our terminal facility in Selby, California experienced a fire that destroyed two storage tanks and temporarily shut down the terminal. The property damage was isolated, and in the fourth quarter of 2019, we incurred losses of $5.4 million, which represent the aggregate amount of our deductibles under various insurance policies. We received insurance proceeds of $28.5 million and $35.0 million, for the years ended December 31, 2021 and 2020, respectively. Gains from business interruption insurance of $4.0 million, $6.7 million and $1.3 million for the years ended December 31, 2021, 2020 and 2019, respectively, are included in “Operating expenses” in the consolidated statements of income (loss). For the year ended December 31, 2021, we recorded a gain of $14.9 million for the amount by which the insurance recoveries exceeded our expenses incurred to date, which is included in “Other income (expense), net” in the consolidated statements of income (loss). Insurance proceeds related to cleanup costs and business interruption are included in “Cash flows from operating activities” in the consolidated statements of cash flows. In addition, we received $5.8 million of insurance proceeds in January 2022. We believe we have adequate insurance to offset additional costs. Sale of Texas City Terminals. On December 7, 2020, we sold the equity interests in our wholly owned subsidiaries that owned two terminals in Texas City, Texas for $106.0 million. We recorded a non-cash loss of $34.7 million and utilized the sales proceeds to improve our debt metrics. Please refer to Note 4 for further discussion. Senior Notes. On September 14, 2020, NuStar Logistics issued $600.0 million of 5.75% senior notes due October 1, 2025 and $600.0 million of 6.375% senior notes due October 1, 2030. We received proceeds of $1,182.0 million, net of issuance costs of $18.0 million, which we used to repay outstanding borrowings under the Term Loan, as defined below, as well as outstanding borrowings under our revolving credit agreement. On September 1, 2020, we repaid our $450.0 million of 4.80% senior notes at maturity with borrowings under our revolving credit agreement. Please refer to Note 12 for further discussion. Term Loan Credit Agreement. On April 19, 2020, NuStar Energy and NuStar Logistics entered into an unsecured term loan credit agreement with certain lenders and Oaktree Fund Administration, LLC, as administrative agent for the lenders (the Term Loan). The Term Loan provided for an aggregate commitment of up to $750.0 million pursuant to a three-year unsecured term loan credit facility. On April 21, 2020 we drew $500.0 million, which we repaid on September 16, 2020. The repayment required certain contractual premiums, and we recognized a loss of $137.9 million in the third quarter of 2020. On February 16, 2021, we terminated the Term Loan. Please refer to Note 12 for further discussion about the Term Loan. Sale of St. Eustatius Operations. On July 29, 2019, we sold our St. Eustatius terminal and bunkering operations (the St. Eustatius Operations) for net proceeds of approximately $230.0 million (the St. Eustatius Disposition). In 2019, we recorded long-lived asset and goodwill impairment charges totaling $336.8 million related to the St. Eustatius Operations in “Loss from discontinued operations, net of tax” on our consolidated statement of loss. In the second quarter of 2019, we determined the St. Eustatius Operations and the European operations, which we sold in 2018, met the requirements to be reported as discontinued operations, and as a result, we reclassified certain balances to assets held for sale and liabilities held for sale and certain revenues and expenses to discontinued operations for all applicable periods presented.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2021
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Consolidation The accompanying consolidated financial statements represent the consolidated operations of the Partnership and our subsidiaries. Inter-partnership balances and transactions have been eliminated in consolidation. The operations of certain pipelines and terminals in which we own an undivided interest are proportionately consolidated in the accompanying consolidated financial statements. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. On an ongoing basis, management reviews its estimates based on currently available information. Management may revise estimates due to changes in facts and circumstances. Cash and Cash Equivalents Cash equivalents are all highly liquid investments with an original maturity of three months or less when acquired. Accounts Receivable Trade receivables are carried at amortized cost, net of a valuation allowance for current expected credit losses. We extend credit to certain customers after review of various credit indicators, including the customer’s credit rating, and obtain letters of credit, guarantees or collateral as deemed necessary. We monitor our ongoing credit exposure through active review of customer balances against contract terms and due dates and pool customer receivables based upon days outstanding, which is our primary credit risk indicator. Our review activities include timely account reconciliations, dispute resolution and payment confirmations. Inventories Inventories consist of petroleum products, materials and supplies. Inventories are valued at the lower of cost or net realizable value. Cost is determined using the weighted-average cost method. Our inventory, other than materials and supplies, consists of one end-product category, petroleum products, which we include in the fuels marketing segment. Accordingly, we determine lower of cost or net realizable value adjustments on an aggregate basis. Materials and supplies are valued at the lower of average cost or net realizable value. Restricted Cash As of December 31, 2021 and 2020, we have restricted cash representing legally restricted funds that are unavailable for general use totaling $8.8 million, which is included in “Other long-term assets, net” on the consolidated balance sheet. Property, Plant and Equipment We record additions to property, plant and equipment, including reliability and strategic capital expenditures, at cost. Repair and maintenance costs associated with existing assets that are minor in nature and do not extend the useful life of existing assets are charged to operating expenses as incurred. Depreciation of property, plant and equipment is recorded on a straight-line basis over the estimated useful lives of the related assets. When property or equipment is retired, sold or otherwise disposed of, the difference between the carrying value and the net proceeds is recognized in “Other income (expense), net” or “Loss from discontinued operations, net of tax” in the consolidated statements of income (loss) in the year of disposition. We capitalize overhead costs and interest costs incurred on funds used to construct property, plant and equipment while the asset is under construction. The overhead costs and capitalized interest are recorded as part of the asset to which they relate and are amortized over the asset’s estimated useful life as a component of depreciation expense. Leases - Lessee We lease assets used in our operations, including land, docks, and marine vessels. We record all leases on our consolidated balance sheet except for those leases with an initial term of 12 months or less, which are expensed on a straight-line basis over the lease term. We use judgment in determining the reasonably certain lease term and consider factors such as the nature and utility of the leased asset, as well as the importance of the leased asset to our operations. We calculate the present value of our lease liabilities based upon our incremental borrowing rate unless the rate implicit in the lease is readily determinable. For all of our asset classes except the other pipeline and terminal equipment asset class, we combine lease and non-lease components and account for them as a single lease component. Certain of our leases are subject to variable payment arrangements, the most notable of which include: •dockage and wharfage charges, which are based on volumes moved over leased docks and are included in our calculation of our lease payments based on minimum throughput volume requirements. We recognize charges on excess throughput volumes in profit or loss in the period in which the obligation for those payments is incurred; and •consumer price index adjustments, which are measured and included in the calculation of our lease payments based on the consumer price index at the commencement date. We recognize changes in lease payments as a result of changes in the consumer price index in profit or loss in the period in which those payments are made. See Note 15 for further discussion of our lessee arrangements. Goodwill We assess goodwill for impairment annually on October 1, or more frequently if events or changes in circumstances indicate it might be impaired. We have the option to first assess qualitative factors to determine whether it is necessary to perform a quantitative goodwill impairment test. We elected to bypass the qualitative assessment for all reporting units as of October 1, 2021 and October 1, 2020 and performed quantitative assessments, resulting in the determination that goodwill was not impaired. We measure goodwill impairment as the excess of each reporting unit’s carrying value over its fair value, not to exceed the carrying amount of goodwill for that reporting unit. The carrying value of each reporting unit equals the total identified assets (including goodwill) less the sum of each reporting unit’s identified liabilities. We used reasonable and supportable methods to assign the assets and liabilities to the appropriate reporting units in a consistent manner. As of December 31, 2021 and 2020, our reporting units to which goodwill has been allocated consisted of the following: •crude oil pipelines; •refined product pipelines; and •terminals, excluding our Point Tupper facility and our refinery crude storage tanks. Please see Notes 4 and 10 for a discussion of the balances of and changes in the carrying amount of goodwill. We recognize an impairment of goodwill if the carrying value of a reporting unit that contains goodwill exceeds its estimated fair value. In order to estimate the fair value of the reporting unit, including goodwill, management must make certain estimates and assumptions that affect the total fair value of the reporting unit including, among other things, an assessment of market conditions, projected cash flows, discount rates and growth rates. Management’s estimates of projected cash flows related to the reporting unit include, but are not limited to, future earnings of the reporting unit, assumptions about the use or disposition of the asset, estimated remaining life of the asset, and future expenditures necessary to maintain the asset’s existing service potential. We calculate the estimated fair value of each of our reporting units using a weighted-average of values calculated using an income approach and a market approach. The income approach involves estimating the fair value of each reporting unit by discounting its estimated future cash flows using a discount rate that would be consistent with a market participant’s assumption. The market approach bases the fair value measurement on information obtained from observed stock prices of public companies and recent merger and acquisition transaction data of comparable entities. Management’s estimates are based on numerous assumptions about future operations and market conditions, which we believe to be reasonable but are inherently uncertain. The uncertainties underlying our assumptions and estimates could differ significantly from actual results, including with respect to the duration and severity of the COVID-19 pandemic, which could lead to a different determination of the fair value of our assets. We will continue to monitor the business and consider additional interim analysis of goodwill as appropriate. Impairment of Long-Lived Assets We review long-lived assets, including property, plant and equipment, for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. We evaluate recoverability using undiscounted estimated net cash flows generated by the related asset or asset group. If the results of that evaluation indicate that the undiscounted cash flows are less than the carrying amount of the asset (i.e., the asset is not recoverable) we perform an impairment analysis. If our intent is to hold the asset for continued use, we determine the amount of impairment as the amount by which the net carrying value exceeds its fair value. If our intent is to sell the asset, and the criteria required to classify an asset as held for sale are met, we determine the amount of impairment as the amount by which the net carrying amount exceeds its fair value less costs to sell. See Note 4 for a discussion of our long-lived asset impairment charges. We believe that the carrying amounts of our long-lived assets as of December 31, 2021 are recoverable. Income Taxes We are a limited partnership and generally are not subject to federal or state income taxes. Accordingly, our taxable income or loss, which may vary substantially from income or loss reported for financial reporting purposes, is generally included in the federal and state income tax returns of our partners. For transfers of publicly held common units subsequent to our initial public offering, we have made an election permitted by Section 754 of the Internal Revenue Code (the Code) to adjust the common unit purchaser’s tax basis in our underlying assets to reflect the purchase price of the units. This results in an allocation of taxable income and expenses to the purchaser of the common units, including depreciation deductions and gains and losses on sales of assets, based upon the new unitholder’s purchase price for the common units. We conduct certain of our operations through taxable wholly owned corporate subsidiaries. We account for income taxes related to our taxable subsidiaries using the asset and liability method. Under this method, we recognize deferred tax assets and liabilities for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. We measure deferred taxes using enacted tax rates expected to apply to taxable income in the year those temporary differences are expected to be recovered or settled. We recognize a tax position if it is more likely than not that the tax position will be sustained, based on the technical merits of the position, upon examination. We record uncertain tax positions in the financial statements at the largest amount of benefit that is more likely than not to be realized. We had no unrecognized tax benefits as of December 31, 2021 and 2020. NuStar Energy and certain of its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. For U.S. federal and state purposes, as well as for our major non-U.S. jurisdictions, tax years subject to examination are 2016 through 2020, according to standard statute of limitations. Asset Retirement Obligations We record a liability for asset retirement obligations at the fair value of the estimated costs to retire a tangible long-lived asset at the time we incur that liability, which is generally when the asset is purchased, constructed or leased, when we have a legal obligation to incur costs to retire the asset and when a reasonable estimate of the fair value of the obligation can be made. If a reasonable estimate cannot be made at the time the liability is incurred, we record the liability when sufficient information is available to estimate the fair value. We have asset retirement obligations with respect to certain of our assets due to various legal obligations to clean and/or dispose of those assets at the time they are retired. However, these assets can be used for an extended and indeterminate period of time as long as they are properly maintained and/or upgraded. It is our practice and current intent to maintain our assets and continue making improvements to those assets based on technological advances. As a result, we believe that our assets have indeterminate lives for purposes of estimating asset retirement obligations because dates or ranges of dates upon which we would retire these assets cannot reasonably be estimated at this time. When a date or range of dates can reasonably be estimated for the retirement of any asset, we estimate the costs of performing the retirement activities and record a liability for the fair value of these costs. We also have legal obligations in the form of leases and right-of-way agreements, which require us to remove certain of our assets upon termination of the agreement. However, these lease or right-of-way agreements generally contain automatic renewal provisions that extend our rights indefinitely or we have other legal means available to extend our rights. Liabilities for conditional asset retirement obligations related to the retirement of terminal assets with lease and right-of-way agreements were not material as of December 31, 2021 and 2020. Environmental Remediation Costs Environmental remediation costs are expensed and an associated accrual established when site restoration and environmental remediation and cleanup obligations are either known or considered probable and can be reasonably estimated. These environmental obligations are based on estimates of probable undiscounted future costs using currently available technology and applying current regulations, as well as our own internal environmental policies. The environmental liabilities have not been reduced by possible recoveries from third parties. Environmental costs include initial site surveys, costs for remediation and restoration and ongoing monitoring costs, as well as fines, damages and other costs, when applicable and estimable. Adjustments to initial estimates are recorded, from time to time, to reflect changing circumstances and estimates based upon additional information developed in subsequent periods. Revenue Recognition Revenue-Generating Activities. Revenues for the pipeline segment are derived from interstate and intrastate pipeline transportation of refined products, crude oil and anhydrous ammonia and the applicable pipeline tariff on a per barrel basis for crude oil or refined products and on a per ton basis for ammonia. Revenues generated from product sales in the pipeline segment relate to surplus pipeline loss allowance volumes. Revenues for the storage segment include fees for tank storage agreements, under which a customer agrees to pay for a certain amount of storage in a tank over a period of time (storage terminal revenues), and throughput agreements, under which a customer pays a fee per barrel for volumes moving through our terminals (throughput terminal revenues). Our terminals also provide blending, additive injections, handling and filtering services for which we charge additional fees. Certain of our facilities charge fees to provide marine services such as pilotage, tug assistance, line handling, launch service, emergency response services and other ship services (all of which are considered optional services). We are considered to be the lessor in certain revenue contracts. To the extent that a contract contains both lease and non-lease components, such as when we provide both storage capacity and optional services to a customers, we combine the lease and non-lease components and account for the transaction based on the predominant component. Revenues for the fuels marketing segment are derived from the sale of petroleum products. Within our pipeline and storage segments, we provide services on uninterruptible and interruptible bases. Uninterruptible services within our pipeline segment typically result from contracts that contain take-or-pay minimum volume commitments (MVCs) from the customer. Contracts with MVCs obligate the customer to pay for that minimum amount. If a customer fails to meet its MVC for the applicable service period, the customer is obligated to pay a deficiency fee based upon the shortfall between the actual volumes transported or stored and the MVC for that service period (deficiency payments). In exchange, those contracts with MVCs obligate us to stand ready to transport volumes up to the customer’s MVC. Within our storage segment, uninterruptible services arise from contracts containing a fixed monthly fee for the portion of storage capacity reserved by the customer. These contracts require that the customer pay the fixed monthly fee, regardless of whether or not it uses our storage facility (i.e., take-or-pay obligation), and that we stand ready to store that volume. Interruptible services within our pipeline and storage segments are generally provided when and to the extent we determine the requested capacity is available. The customer typically pays a per-unit rate for the actual quantities of services it receives. For the majority of our contracts, we recognize revenue in the amount to which we have a right to invoice. Generally, payment terms do not exceed 30 days. Performance Obligations. The majority of our contracts contain a single performance obligation. For our pipeline segment, the single performance obligation encompasses multiple activities necessary to deliver our customers’ products to their destinations. Typically, we satisfy this performance obligation over time as the product volume is delivered in or out of the pipelines. Certain of our pipeline segment customer contracts include an incentive pricing structure, which provides a discounted rate for the remainder of the contract once the customer exceeds a cumulative volume. The ability to receive discounted future services represents a material right to the customer, which results in a second performance obligation in those contracts. The performance obligation for our storage segment consists of multiple activities necessary to receive, store and deliver our customers’ products. We typically satisfy this performance obligation over time as the product volume is delivered in or out of the tanks (for throughput terminal revenues) or with the passage of time (for storage terminal revenues). Product sales contracts generally include a single performance obligation to deliver specified volumes of a commodity, which we satisfy at a point in time, when the product is delivered and the customer obtains control of the commodity. Optional services described in our contracts do not provide a material right to the customer, and are not considered a separate performance obligation in the contract. If and when a customer elects an optional service, and the terms of the contract are otherwise met, those services become part of the existing performance obligation. Transaction Price. For uninterruptible services, we determine the transaction price at contract inception based on the guaranteed minimum amount of revenue over the term of the contract. For interruptible services and optional services, we determine the transaction price based on our right to invoice the customer for the value of services provided to the customer for the applicable period. In certain instances, our customers reimburse us for capital projects, in arrangements referred to as contributions in aid of construction, or CIAC. Typically, in these instances, we receive upfront payments for future services, which are included in the transaction price of the underlying service contract. We collect taxes on certain revenue transactions to be remitted to governmental authorities, which may include sales, use, value-added and some excise taxes. These taxes are not included in the transaction price and are, therefore, excluded from revenues. Allocation of Transaction Price. We allocate the transaction price to the single performance obligation that exists in the vast majority of our contracts with customers. For the few contracts that have a second performance obligation, such as those that include an incentive pricing structure, we calculate an average rate based on the estimated total volumes to be delivered over the term of the contract and the resulting estimated total revenue to be billed using the applicable rates in the contract. We allocate the transaction price to the two performance obligations by applying the average rate to product volumes as they are delivered to the customer over the term of the contract. Determining the timing and amount of volumes subject to these incentive pricing contracts requires judgment that can impact the amount of revenue allocated to the two separate performance obligations. We base our estimates on our analysis of expected future production information available from our customers or other sources, which we update at least quarterly. Some of our MVC contracts include provisions that allow the customer to apply deficiency payments to future service periods (the carryforward period). In those instances, we have not satisfied our performance obligation as we still have the obligation to perform those services, subject to contractual and/or capacity constraints, at the customer’s request. At least quarterly, we assess the customer’s ability to utilize any deficiency payments during the carryforward period. If we receive a deficiency payment from a customer that we expect the customer to utilize during the carryforward period, we defer that amount as a contract liability. We will consider the performance obligation satisfied and allocate any deferred deficiency payments to our performance obligation when the customer utilizes the deficiency payment, the carryforward period ends or we determine the customer cannot or will not utilize the deficiency payment (i.e. breakage). If our contract does not allow the customer to apply deficiency payments to future service periods, we allocate the deficiency payment to the already satisfied portion of the performance obligation. Income Allocation Our partnership agreement contains provisions for the allocation of net income to the unitholders. Our net income for each quarterly reporting period is first allocated to the preferred limited partner unitholders in an amount equal to the earned distributions for the respective reporting period. We allocate the remaining net income or loss among the common unitholders. Basic and Diluted Net Income (Loss) Per Common Unit Basic and diluted net income (loss) per common unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partners and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include restricted units awarded under our long-term incentive plans. We compute basic net income (loss) per common unit by dividing net income (loss) attributable to our common limited partners by the weighted-average number of common units outstanding during the period. We compute diluted net income (loss) per common unit by dividing net income (loss) attributable to our common limited partners by the sum of (i) the weighted-average number of common units outstanding during the period and (ii) the effect of dilutive potential common units outstanding during the period. Dilutive potential common units include contingently issuable performance units awarded and the Series D Preferred Units. See Note 22 for additional information on our performance units, Note 17 for additional information on our Series D Preferred Units and Note 19 for the calculation of basic and diluted net income (loss) per common unit. Derivative Financial Instruments When we apply hedge accounting, we formally document all relationships between hedging instruments and hedged items. This process includes identification of the hedging instrument and the hedged transaction, the nature of the risk being hedged and how the hedging instrument’s effectiveness will be assessed. To qualify for hedge accounting, at inception of the hedge we assess whether the derivative instruments that are used in our hedging transactions are expected to be highly effective in offsetting changes in cash flows. Throughout the designated hedge period and at least quarterly, we assess whether the derivative instruments are highly effective and continue to qualify for hedge accounting. We enter into the forward-starting swaps in order to hedge the risk of changes in the interest payments attributable to changes in the benchmark interest rate during the period from the effective date of the swap to the issuance of the forecasted debt. For forward-starting interest rate swaps designated and qualifying as cash flow hedges, we recognize the fair value of each interest rate swap in the consolidated balance sheets. We record changes in the fair value of the hedge as a component of accumulated other comprehensive income (loss) (AOCI), to the extent those cash flow hedges remain highly effective. If at any point a cash flow hedge ceases to qualify for hedge accounting, changes in the fair value of the hedge are recognized in “Interest expense, net” from that date forward. The amount accumulated in AOCI is amortized into “Interest expense, net” as the forecasted interest payments occur or if the interest payments are probable not to occur. We classify cash flows associated with our derivative instruments as operating cash flows in the consolidated statements of cash flows, except for receipts or payments associated with terminated forward-starting interest rate swap agreements, which are included in cash flows from financing activities. See Note 16 for additional information regarding our derivative financial instruments. Unit-based Compensation Unit-based compensation for our long-term incentive plans is recorded in our consolidated balance sheets based on the fair value of the awards granted and recognized as compensation expense primarily on a straight-line basis over the requisite service period. Forfeitures of our unit-based compensation awards are recognized as an adjustment to compensation expense when they occur. Unit-based compensation expense is included in “General and administrative expenses” on our consolidated statements of income (loss). Most of our currently outstanding awards are classified as equity awards as we intend to settle these awards through the issuance of our common units. See Note 22 for additional information regarding our unit-based compensation. Foreign Currency Translation The functional currencies of our foreign subsidiaries are the local currencies of the countries in which the subsidiaries are located. The assets and liabilities of our foreign subsidiaries with local functional currencies are translated to U.S. dollars at period-end exchange rates, and income and expense items are translated to U.S. dollars at weighted-average exchange rates in effect during the period. These translation adjustments are included in “Accumulated other comprehensive loss” in the equity section of the consolidated balance sheets. Gains and losses on foreign currency transactions are included in “Other income (expense), net” in the consolidated statements of income (loss). Reclassifications We have reclassified certain previously reported amounts in the consolidated financial statements and notes to conform to current-period presentation.

NEW ACCOUNTING PRONOUNCEMENTS	12 Months Ended
NEW ACCOUNTING PRONOUNCEMENTS	Dec. 31, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
NEW ACCOUNTING PRONOUNCEMENTS	NEW ACCOUNTING PRONOUNCEMENTS Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity In August 2020, the Financial Accounting Standards Board (FASB) issued guidance intended to simplify the accounting for convertible instruments by eliminating certain accounting models for convertible debt instruments and convertible preferred stock, requiring the calculation of diluted earnings-per-unit to include the effect of potential unit settlement for any convertible instruments that may be settled in either cash or units, and amending the disclosure requirements for convertible instruments. The guidance is effective for annual periods beginning after December 15, 2021, and early adoption was permitted for annual periods beginning after December 15, 2020. Amendments may be applied using either a modified retrospective approach or a fully retrospective approach. We adopted the amended guidance on January 1, 2022 using the modified retrospective approach. While the amended guidance did not have a material impact on our financial position, results of operations, or disclosures at adoption, changes to the earnings-per-unit guidance could result in changes to our diluted net income (loss) per common unit. Reference Rate Reform In March 2020, the FASB issued guidance intended to provide relief to companies impacted by reference rate reform. The amended guidance provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The publication of U.S. dollar LIBOR rates for the most common tenors is expected to cease after publication on June 30, 2023. As of December 31, 2021, approximately $0.6 billion of our variable-rate debt uses LIBOR as a benchmark for establishing the interest rate. In addition, the distribution rates on our Series A, B and C preferred units convert from fixed rates to floating rates based on LIBOR, beginning in December 2021, June 2022 and December 2022, respectively. The FASB’s guidance is effective as of March 12, 2020 through December 31, 2022. We adopted the guidance on the effective date on a prospective basis. The guidance did not have an impact on our financial position, results of operations or disclosures at transition, but we will continue to evaluate its impact on contracts modified on or before December 31, 2022.

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS

12 Months Ended

Dec. 31, 2021

Discontinued Operations and Disposal Groups [Abstract]

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS

Eastern U.S. Terminals Disposition

On August 1, 2021, we entered into an agreement (the Purchase Agreement) to sell the Eastern U.S. Terminal Operations to Sunoco LP for $250.0 million in cash. The Eastern U.S. Terminal Operations include terminals in the following locations; Jacksonville, Florida; Andrews Air Force Base, Maryland; Baltimore, Maryland; Piney Point, Maryland; Virginia Beach, Virginia; Paulsboro, New Jersey; and Blue Island, Illinois, as well as both Linden, New Jersey terminals. The Eastern U.S. Terminal Operations had an aggregate storage capacity of 14.8 million barrels and were included in the storage segment. We determined these assets were no longer synergistic with our core assets. The Eastern U.S. Terminal Operations did not qualify for reporting as discontinued operations, as the sale did not represent a strategic shift that would have a major effect on our operations or financial results. We closed the sale on October 8, 2021 and used the proceeds from the sale to reduce debt and thereby improve our debt metrics.

The Eastern U.S. Terminal Operations met the criteria to be classified as held for sale upon our entrance into the Purchase Agreement during the third quarter of 2021. At that time, we allocated goodwill of $34.1 million to the Eastern U.S. Terminal Operations based on its fair value relative to the terminals reporting unit, with which it had been fully integrated. We tested the allocated goodwill for impairment by comparing the fair value of the Eastern U.S. Terminal Operations to its carrying value. The results of our goodwill impairment test indicated that the carrying value of the Eastern U.S. Terminal Operations exceeded its fair value, and we recognized a related goodwill impairment charge of $34.1 million in the third quarter of 2021 to reduce the allocated goodwill to $0. The goodwill impairment loss is reported in “Goodwill impairment losses” on the consolidated statement of income for the year ended December 31, 2021. We believe that the sales price of $250.0 million provided a

reasonable indication of the fair value of the Eastern U.S. Terminal Operations as it represents an exit price in an orderly transaction between market participants. The sales price is a quoted price for identical assets and liabilities in a market that is not active and, thus, our fair value estimate falls within Level 2 of the fair value hierarchy.

We compared the remaining carrying value of the Eastern U.S. Terminal Operations, after its goodwill impairment, to its fair value less costs to sell. We recognized an asset impairment loss of $95.7 million in the third quarter of 2021, which is reported in “Asset impairment losses” on the consolidated statement of income for the year ended December 31, 2021. The asset impairment loss included $23.9 million related to intangible assets representing customer contracts and relationships.

Houston Pipeline Impairment

In the third quarter of 2021, we recorded a long-lived asset impairment charge of $59.2 million within our pipeline segment related to our refined product pipeline extending from Mt. Belvieu, Texas to Corpus Christi, Texas (the Houston Pipeline). During the third quarter of 2021, we identified an indication of impairment related to the southern section of the Houston Pipeline, specifically that its physical condition would require significant investment in order to pursue commercial opportunities. Consequently, we separated the pipeline into two distinct assets: the northern and southern sections. Our estimate of the undiscounted cash flows associated with the southern section indicated it was not recoverable. Due to the factors described above, we determined the carrying value of the southern section exceeded its fair value, and reduced its carrying value to $0. We recorded the asset impairment charge in “Asset impairment losses” on the consolidated statement of income for the year ended December 31, 2021. We determined that the northern portion of the pipeline was not impaired.

Sale of Texas City Terminals

On December 7, 2020, we sold the equity interests in our wholly owned subsidiaries that owned two terminals in Texas City, Texas for $106.0 million (the Texas City Sale). The two terminals had an aggregate storage capacity of 3.0 million barrels and were previously included in our storage segment. We recorded a non-cash loss of $34.7 million in “Other income (expense), net” on our consolidated statement of loss for the year ended December 31, 2020 and utilized the sales proceeds to reduce debt and thereby improve our debt metrics.

Sale of St. Eustatius Operations

On July 29, 2019, we sold the St. Eustatius Operations for net proceeds of approximately $230.0 million. The St. Eustatius Disposition included a 14.3 million barrel storage and terminalling facility and related assets on the island of St. Eustatius in the Caribbean Netherlands. We previously reported the terminal operations in our storage segment and the bunkering operations in our fuels marketing segment. We recognized a non-cash loss on the sale of $3.9 million in “Loss from discontinued operations, net of tax” on the consolidated statement of loss for the year ended December 31, 2019.

Impairments. On January 28, 2019, the U.S. Department of the Treasury’s Office of Foreign Assets Control added Petroleos de Venezuela, S.A. (PDVSA), at the time a customer at the St. Eustatius facility, to its List of Specially Designated Nationals and Blocked Persons (the SDN List). The inclusion of PDVSA on the SDN List required us to wind down our contracts with PDVSA. Prior to winding down such contracts, PDVSA was the St. Eustatius terminal’s largest customer. The effect of the sanctions issued against PDVSA, combined with the progression in the sale negotiations that occurred during March 2019, resulted in triggering events that caused us to evaluate the long-lived assets and goodwill associated with the St. Eustatius terminal and bunkering operations for potential impairment.

With respect to the terminal operations long-lived assets, our estimates of future expected cash flows included the possibility of a near-term sale, as well as continuing to operate the terminal. The carrying value of the terminal’s long-lived assets exceeded our estimate of the total expected cash flows, indicating the long-lived assets were potentially impaired. To determine an impairment amount, we estimated the fair value of the long-lived assets for comparison to the carrying amount of those assets. Our estimate of the fair value considered the expected sales price as well as estimates generated from income and market approaches using a market participant’s assumptions. The estimated fair values resulting from the market and income approaches were consistent with the expected sales price. Therefore, we concluded that the estimated sales price, which was less than the carrying amount of the long-lived assets, represented the best estimate of fair value at March 31, 2019, and we recorded a long-lived asset impairment charge of $297.3 million in the first quarter of 2019 to reduce the carrying value of the assets to their estimated fair value. We recorded an additional impairment charge of $8.4 million in the second quarter of 2019, mainly due to additional capital expenditures incurred in that quarter.

With respect to the goodwill in the Statia Bunkering reporting unit, which consisted of our bunkering operations at the St. Eustatius terminal facility, we estimated the fair value based on the expected sales price discussed above, which is inclusive of the bunkering operations. As a result, we concluded the goodwill was impaired. We measured the goodwill impairment as the

difference between the reporting unit’s carrying value and its fair value. Therefore, we recognized a goodwill impairment charge of $31.1 million in the first quarter of 2019 to reduce the goodwill to $0 for the Statia Bunkering reporting unit.

The impairment charges are included in “Loss from discontinued operations, net of tax” on the consolidated statement of loss for the year ended December 31, 2019.

Discontinued Operations. During the second quarter of 2019, we determined the assets and liabilities associated with the St. Eustatius Operations met the criteria to be classified as held for sale. We determined the St. Eustatius Operations met the requirements to be reported as discontinued operations since the St. Eustatius Disposition and the sale of the European operations in November 2018 together represented a strategic shift that will have a major impact on our operations and financial results. These sales were part of our plan to improve our debt metrics and partially fund capital projects to grow our core business in North America. Accordingly, we reclassified certain balances to assets held for sale and liabilities held for sale. The consolidated statement of loss for the year ended December 31, 2019 reflects the St. Eustatius Operations as discontinued operations.

The following is a reconciliation of the major classes of line items included in “Loss from discontinued operations, net of tax” on the consolidated statements of income (loss):


	Year Ended December 31, 2019
	(Thousands of Dollars)



Revenues	$	248,981
Costs and expenses:





Cost of revenues	220,595
Impairment losses	336,838
General and administrative expenses (excluding depreciation and amortization expense)	1,231

Total costs and expenses	558,664
Operating loss	(309,683)
Interest income, net	32
Other expense, net	(2,775)
Loss from discontinued operations before income tax expense	(312,426)
Income tax expense	101
Loss from discontinued operations, net of tax	$	(312,527)

The consolidated statements of cash flows have not been adjusted to separately disclose cash flows related to discontinued operations. The following table presents selected cash flow information associated with our discontinued operations:


	Year Ended December 31, 2019
	(Thousands of Dollars)
Capital expenditures	$	(27,954)

Significant noncash operating activities and other adjustments:
Depreciation and amortization expense	$	8,536
Asset impairment losses	$	305,715
Goodwill impairment loss	$	31,123
Loss from sale of the St. Eustatius Operations	$	3,942

REVENUE FROM CONTRACTS WITH CUSTOMERS

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

REVENUE FROM CONTRACTS WITH CUSTOMERS

Contract Assets and Contract Liabilities

The following table provides information about contract assets and contract liabilities from contracts with customers:


	2021				2020				2019
	Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,694	$	(22,019)	$	2,140	$	(21,083)	$	2,066	$	(21,579)
Noncurrent portion	932		(47,537)		1,003		(40,289)		539		(38,945)
Held for sale	—		—		—		—		—		(25,357)
Total	3,626		(69,556)		3,143		(61,372)		2,605		(85,881)

Activity:
Additions	3,888		(41,121)		5,686		(69,830)		4,890		(52,957)
Transfer to accounts receivable	(3,977)		—		(4,828)		—		(4,352)		—
Transfer to revenues, including amounts reported in discontinued operations	(697)		49,207		(375)		61,646		—		77,466

Total	(786)		8,086		483		(8,184)		538		24,509

Balances as of December 31:
Current portion	2,336		(15,443)		2,694		(22,019)		2,140		(21,083)
Noncurrent portion	504		(46,027)		932		(47,537)		1,003		(40,289)

Total	$	2,840	$	(61,470)	$	3,626	$	(69,556)	$	3,143	$	(61,372)

Contract assets relate to performance obligations satisfied in advance of scheduled billings. Current contract assets are included in “Other current assets” and noncurrent contract assets are included in “Other long-term assets, net” on the consolidated balance sheets. Contract liabilities relate to payments received in advance of satisfying performance obligations under a contract, which mainly result from contracts with an incentive pricing structure, CIAC payments and contracts with MVCs. The current portion of contract liabilities are included in “Accrued liabilities” and the noncurrent portion of contract liabilities are included in “Other long-term liabilities” on the consolidated balance sheets.

Remaining Performance Obligations

The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of December 31, 2021 (in thousands of dollars):


2022	$	413,612
2023	277,278
2024	187,995
2025	131,877
2026	89,103
Thereafter	92,064
Total	$	1,191,929

Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to customer contracts that have fixed pricing and fixed volume terms and conditions, generally including contracts with MVC payment obligations.

Disaggregation of Revenues

The following table disaggregates our revenues:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	331,485	$	329,105	$	316,417
Refined products and ammonia pipelines (excluding lessor revenues)	430,753		387,793		376,588
Total pipeline segment revenues from contracts with customers	762,238		716,898		693,005
Lessor revenues	—		1,925		8,825
Total pipeline segment revenues	762,238		718,823		701,830

Storage segment:
Throughput terminals	122,331		136,632		114,243
Storage terminals (excluding lessor revenues)	263,883		316,496		298,984
Total storage segment revenues from contracts with customers	386,214		453,128		413,227
Lessor revenues	41,454		41,314		40,774
Total storage segment revenues	427,668		494,442		454,001

Fuels marketing segment:
Revenues from contracts with customers	428,608		268,345		342,215

Consolidation and intersegment eliminations	(14)		(46)		(25)

Total revenues	$	1,618,500	$	1,481,564	$	1,498,021

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

+ Details

ALLOWANCE FOR CREDIT LOSSES

12 Months Ended

Dec. 31, 2021

Allowance for Credit Loss [Abstract]

ALLOWANCE FOR CREDIT LOSSES

The balance of and changes in the allowance for credit losses consisted of the following:


	Year Ended December 31,
	2020		2019
	(Thousands of Dollars)
Balance as of beginning of year	$	72	$	9,412
Current period provision for credit losses	441		2,322
Write-offs charged against the allowance	(513)		(11,662)


Balance as of end of year	$	—	$	72

Activity for the year ended December 31, 2021 was immaterial and the balance as of December 31, 2021 was $0.

INVENTORIES

12 Months Ended

Dec. 31, 2021

Inventory Disclosure [Abstract]

INVENTORIES

Inventories consisted of the following:


	December 31,
	2021		2020
	(Thousands of Dollars)
Petroleum products	$	12,456	$	7,394
Materials and supplies	4,188		3,665
Total	$	16,644	$	11,059

We purchase petroleum products for resale. Our petroleum products consist of intermediates, gasoline, distillates and other petroleum products. Materials and supplies mainly consist of blending and additive chemicals and maintenance materials used in our pipeline and storage segments.

PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following:


	Estimated Useful Lives			December 31,
				2021		2020
	(Years)			(Thousands of Dollars)
Land, buildings and improvements	0	-	40	$	366,525	$	440,358
Pipelines, storage and terminals	15	-	40	4,897,041		5,253,507
Rights-of-way	20	-	40	353,262		359,441
Construction in progress				112,020		111,436
Total				5,728,848		6,164,742
Less accumulated depreciation and amortization				(2,187,206)		(2,207,230)
Property, plant and equipment, net				$	3,541,642	$	3,957,512

Capitalized interest costs added to property, plant and equipment, including amounts related to discontinued operations, totaled $3.9 million, $4.9 million and $8.9 million for the years ended December 31, 2021, 2020 and 2019, respectively. Depreciation and amortization expense for property, plant and equipment totaled $220.4 million, $228.8 million and $226.0 million for the years ended December 31, 2021, 2020 and 2019, respectively, including depreciation and amortization expense reported in “Loss from discontinued operations, net of tax” on the consolidated statements of income (loss).

INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2021

Intangible Assets, Net (Excluding Goodwill) [Abstract]

INTANGIBLE ASSETS

Intangible assets consisted of the following:


	Weighted-Average Amortization Period	December 31, 2021				December 31, 2020
		Cost		Accumulated Amortization		Cost		Accumulated Amortization
	(Years)	(Thousands of Dollars)
Customer contracts and relationships	17	$	793,900	$	(237,579)	$	863,900	$	(235,205)
Other	47	2,359		(895)		2,359		(845)
Total		$	796,259	$	(238,474)	$	866,259	$	(236,050)

Intangible assets are recorded at fair value as of the date acquired. All of our intangible assets are amortized on a straight-line basis. Amortization expense for intangible assets was $48.5 million for the year ended December 31, 2021 and $51.4 million for each of the years ended December 31, 2020 and 2019. The estimated aggregate amortization expense is $44.0 million for 2022 and $38.0 million for each of the years 2023 through 2026.

GOODWILL

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL

The balances of and changes in the carrying amount of goodwill by segment were as follows:


	Pipeline		Storage		Total
	(Thousands of Dollars)
Balances as of January 1, 2020	$	704,231	$	301,622	$	1,005,853

Activity for the year ended December 31, 2020:
Goodwill impairment loss on crude oil pipelines	(225,000)		—		(225,000)
Texas City Sale	—		(14,437)		(14,437)

Balances as of December 31, 2020:
Goodwill	704,231		287,185		991,416
Accumulated impairment loss	(225,000)		—		(225,000)
Net goodwill	479,231		287,185		766,416

Activity for the year ended December 31, 2021:
Goodwill impairment loss on Eastern U.S. Terminal Operations	—		(34,060)		(34,060)

Balances as of December 31, 2021:
Goodwill	704,231		253,125		957,356
Accumulated impairment loss	(225,000)		—		(225,000)
Net goodwill	$	479,231	$	253,125	$	732,356

Eastern U.S. Terminals Operations. On October 8, 2021, we completed the sale of the Eastern U.S. Terminals Operations. In the third quarter of 2021, the Eastern U.S. Terminal Operations met the criteria to be classified as held for sale, and we tested the allocated goodwill for impairment. We recognized a goodwill impairment charge of $34.1 million in the third quarter of 2021. Please see Note 4 for additional information on the disposition.

Texas City Sale. On December 7, 2020, we completed the Texas City Sale and the goodwill associated with the sold terminals was included in the calculation of the loss on sale. Please see Note 4 for additional information on the sale.

2020 Impairment. In March 2020, the COVID-19 pandemic and actions taken by the Organization of Petroleum Exporting Countries and other oil-producing nations (OPEC+) resulted in severe disruptions in the capital and commodities markets, which led to significant decline in our unit price. As a result, our equity market capitalization fell significantly. The decline in crude oil prices and demand for petroleum products also led to a decline in expected earnings from some of our goodwill reporting units. These factors and others related to COVID-19 and OPEC+ caused us to conclude there were triggering events that occurred in March 2020 that required us to perform a goodwill impairment test as of March 31, 2020. We recognized a goodwill impairment charge of $225.0 million in the first quarter of 2020, which is reported in the pipeline segment. Our assessment did not identify any other reporting units at risk of a goodwill impairment.

We calculated the estimated fair value of each of our reporting units using a weighted-average of values determined from an income approach and a market approach. The income approach involves estimating the fair value of each reporting unit by discounting its estimated future cash flows using a discount rate that would be consistent with a market participant’s assumption. The market approach bases the fair value measurement on information obtained from observed stock prices of public companies and recent merger and acquisition transaction data of comparable entities. In order to estimate the fair value of goodwill, management must make certain estimates and assumptions that affect the total fair value of the reporting unit including, among other things, an assessment of market conditions, projected cash flows, discount rates and growth rates. Management’s estimates of projected cash flows related to the reporting unit include, but are not limited to, future earnings of the reporting unit, assumptions about the use or disposition of assets included in the reporting unit, estimated remaining lives of those assets, and future expenditures necessary to maintain the assets’ existing service potential. The assumptions in the fair value measurement reflect the current market environment, industry-specific factors and company-specific factors.

The decline in expected earnings from certain of our long-lived assets was also an indicator that the carrying values of these long-lived assets may not be recoverable. Prior to performing the goodwill impairment test, we tested these long-lived assets for recoverability and determined they were fully recoverable as of March 31, 2020.

Management’s estimates are based on numerous assumptions about future operations and market conditions, which we believe to be reasonable but are inherently uncertain. The uncertainties underlying our assumptions and estimates could differ significantly from actual results, including with respect to the duration and severity of the COVID-19 pandemic.

ACCRUED LIABILITIES

12 Months Ended

Dec. 31, 2021

Accrued Liabilities, Current [Abstract]

ACCRUED LIABILITIES

Accrued liabilities consisted of the following:


	December 31,
	2021		2020
	(Thousands of Dollars)
Employee wages and benefit costs	$	40,209	$	27,805
Revenue contract liabilities	15,443		22,019

Operating lease liabilities	10,346		10,890

Environmental costs	3,378		5,371

Other	10,442		11,685
Accrued liabilities	$	79,818	$	77,770

DEBT

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

DEBT

Short-term debt consisted of the current portion of finance leases, with balances of $3.8 million as of December 31, 2021 and 2020. Please refer to Note 15 for additional information.

Long-term debt consisted of the following:


				December 31,
	Maturity			2021		2020
				(Thousands of Dollars)
Revolving Credit Agreement	April 27, 2025 (a)			$	110,500	$	—
6.75% senior notes	February 1, 2021			—		300,000
4.75% senior notes	February 1, 2022			—		250,000
5.75% senior notes	October 1, 2025			600,000		600,000
6.00% senior notes	June 1, 2026			500,000		500,000
5.625% senior notes	April 28, 2027			550,000		550,000
6.375% senior notes	October 1, 2030			600,000		600,000
Subordinated Notes	January 15, 2043			402,500		402,500
GoZone Bonds	2038	thru	2041	322,140		322,140
Receivables Financing Agreement	January 31, 2025 (a)			83,800		57,000
Net fair value adjustments, unamortized discounts and unamortized debt issuance costs		N/A		(38,315)		(42,382)
Total long-term debt (excluding finance leases)				3,130,625		3,539,258
Finance leases (refer to Note 15)				52,930		54,238

Long-term debt, less current portion				$	3,183,555	$	3,593,496

(a)On January 28, 2022, the maturity date on the Revolving Credit Agreement was extended from October 27, 2023 to April 27, 2025 and the scheduled termination date of the Receivables Financing Agreement was extended from September 20, 2023 to January 31, 2025.

The long-term debt repayments (excluding finance leases) as of December 31, 2021 are due as follows (in thousands of dollars):


2022	$	—
2023 (a)	194,300
2024	—
2025	600,000
2026	500,000
Thereafter	1,874,640
Total repayments	3,168,940
Net fair value adjustments, unamortized discounts and unamortized debt issuance costs	(38,315)
Total long-term debt (excluding finance leases)	$	3,130,625

Interest payments totaled $220.0 million, $207.2 million and $183.8 million for the years ended December 31, 2021, 2020 and 2019, respectively, related to debt obligations. We amortized an aggregate of $7.9 million, $11.4 million and $6.5 million of debt issuance costs and debt discount combined for the years ended December 31, 2021, 2020 and 2019, respectively.

Revolving Credit Agreement

As of December 31, 2021, NuStar Logistics’ $1.0 billion revolving credit agreement (the Revolving Credit Agreement) had $884.8 million available for borrowing and $110.5 million borrowings outstanding. Letters of credit issued under the Revolving Credit Agreement totaled $4.7 million as of December 31, 2021. Letters of credit limit the amount we can borrow under the Revolving Credit Agreement. Obligations under the Revolving Credit Agreement are guaranteed by NuStar Energy and NuPOP.

The Revolving Credit Agreement is subject to maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements, which may limit the amount we can borrow to an amount less than the total amount available for borrowing. For the rolling period ending December 31, 2021, the maximum allowed consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) may not exceed 5.00-to-1.00 and the minimum consolidated interest coverage ratio (as defined in the Revolving Credit Agreement), must not be less than 1.75-to-1.00. The Revolving Credit Agreement also contains customary restrictive covenants, such as limitations on indebtedness, liens, mergers, asset transfers and certain investing activities. As of December 31, 2021, we believe that we are in compliance with the covenants in the Revolving Credit Agreement.

Prior to the amendment on January 28, 2022, described below, the Revolving Credit Agreement bore interest, at our option, based on an alternative base rate or a LIBOR-based rate. The interest rate on the Revolving Credit Agreement is subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. In August of 2020, Moody’s Investor Service Inc. downgraded our credit rating from Ba2 to Ba3. This rating downgrade caused the interest rate on our Revolving Credit Agreement to increase by 0.25% effective August 2020. The interest rate on the Revolving Credit Agreement and certain fees under the Receivables Financing Agreement, defined below, are the only debt arrangements that are subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. As of December 31, 2021, our weighted-average interest rate under our Revolving Credit Agreement was 2.9%. During the year ended December 31, 2021, the weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 2.7%.

On January 28, 2022, we amended and restated our unsecured Revolving Credit Agreement to, among other things: (i) extend the maturity date from October 27, 2023 to April 27, 2025; (ii) increase the maximum amount of letters of credit capable of being issued from $400.0 million to $500.0 million; (iii) replace LIBOR benchmark provisions with customary secured overnight financing rate, or SOFR, benchmark provisions; (iv) remove the 0.50x increase permitted in our consolidated debt coverage ratio for certain rolling periods in which an acquisition for aggregate net consideration of at least $50.0 million occurs; and (v) add baskets and exceptions to certain negative covenants. On April 6, 2020, we amended the Revolving Credit Agreement to allow for certain transactions related to the GoZone Bonds discussed below. On March 6, 2020, we amended the Revolving Credit Agreement to, among other things, reduce the total amount available for borrowing from $1.2 billion to $1.0 billion and increase the rates included in the definition of Applicable Rate contained in the Revolving Credit Agreement.

Notes

NuStar Logistics Senior Notes. On November 1, 2021, we repaid our $250.0 million of 4.75% senior notes due February 1, 2022 with proceeds from the Eastern U.S. Terminals Disposition. We repaid our $300.0 million of 6.75% senior notes due February 1, 2021 and our $450.0 million of 4.8% senior notes due September 1, 2020 with borrowings under our Revolving Credit Agreement.

On September 14, 2020, NuStar Logistics issued $600.0 million of 5.75% senior notes due October 1, 2025 and $600.0 million of 6.375% senior notes due October 1, 2030. We received proceeds of $1,182.0 million, net of issuance costs of $18.0 million, which we used to repay outstanding borrowings and the early repayment premiums under the Term Loan, as defined below, as well as outstanding borrowings under our Revolving Credit Agreement. The issuance of the 5.75% and 6.375% senior notes bolstered our liquidity to address our senior note maturities that we repaid in 2021. On May 22, 2019, NuStar Logistics issued $500.0 million of 6.0% senior notes due June 1, 2026. We received net proceeds of $491.6 million, which we used to repay outstanding borrowings under our Revolving Credit Agreement.

Interest is payable semi-annually in arrears for the $600.0 million of 5.75% senior notes, $500.0 million of 6.0% senior notes, $550.0 million of 5.625% senior notes and $600.0 million of 6.375% senior notes (collectively, the NuStar Logistics Senior Notes).

The NuStar Logistics Senior Notes do not have sinking fund requirements. These notes rank equally with existing senior unsecured indebtedness and senior to existing subordinated indebtedness of NuStar Logistics and contain restrictions on NuStar Logistics’ ability to incur secured indebtedness unless the same security is also provided for the benefit of holders of the NuStar Logistics Senior Notes. In addition, the NuStar Logistics Senior Notes limit the ability of NuStar Logistics and its subsidiaries to, among other things, incur indebtedness secured by certain liens, engage in certain sale-leaseback transactions and engage in certain consolidations, mergers or asset sales. At the option of NuStar Logistics, the NuStar Logistics Senior Notes may be redeemed in whole or in part at any time at a redemption price, plus accrued and unpaid interest to the redemption date. If we undergo a change of control, as defined in the supplemental indentures for the NuStar Logistics Senior Notes, each holder of the applicable senior notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes repurchased, plus any accrued and unpaid interest to the date of repurchase. The NuStar Logistics Senior Notes are fully and unconditionally guaranteed by NuStar Energy and NuPOP.

NuStar Logistics Subordinated Notes. NuStar Logistics’ $402.5 million of fixed-to-floating rate subordinated notes are due January 15, 2043 (the Subordinated Notes). The Subordinated Notes are fully and unconditionally guaranteed on an unsecured and subordinated basis by NuStar Energy and NuPOP. Effective January 15, 2018, the interest rate on the Subordinated Notes switched to an annual rate equal to the sum of the three-month LIBOR for the related quarterly interest period, plus 6.734% payable quarterly, commencing April 15, 2018, unless payment is deferred in accordance with the terms of the notes. NuStar Logistics may elect to defer interest payments on the Subordinated Notes on one or more occasions for up to five consecutive years. Deferred interest will accumulate additional interest at a rate equal to the interest rate then applicable to the Subordinated Notes until paid. If NuStar Logistics elects to defer interest payments, NuStar Energy cannot declare or make cash distributions to its unitholders during the period that interest payments are deferred. As of December 31, 2021, the interest rate was 6.9%.

The Subordinated Notes do not have sinking fund requirements and are subordinated to existing senior unsecured indebtedness of NuStar Logistics and NuPOP. The Subordinated Notes do not contain restrictions on NuStar Logistics’ ability to incur additional indebtedness, including debt that ranks senior in priority of payment to the notes. In addition, the Subordinated Notes do not limit NuStar Logistics’ ability to incur indebtedness secured by liens or to engage in certain sale-leaseback transactions. Effective January 15, 2018, we may redeem the Subordinated Notes in whole or in part at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest to the redemption date.

Gulf Opportunity Zone Revenue Bonds

In 2008, 2010 and 2011, the Parish of St. James, Louisiana issued Revenue Bonds Series 2008, Series 2010, Series 2010A, Series 2010B and Series 2011 associated with our St. James terminal expansions pursuant to the Gulf Opportunity Zone Act of 2005 for an aggregate $365.4 million (collectively, the GoZone Bonds). Following the issuances, the proceeds were deposited with a trustee and were disbursed to us upon our request for reimbursement of expenditures related to our St. James terminal. On March 4, 2020, NuStar Logistics repaid $43.3 million of GoZone Bonds with unused funds, which had been held in trust. NuStar Logistics is obligated to make payments in amounts sufficient to pay the principal of, premium, if any, interest and certain other payments on, the GoZone Bonds.

On June 3, 2020, NuStar Logistics completed the reoffering and conversion of the GoZone Bonds through supplements to the original indentures governing the GoZone Bonds and supplements to the original agreements between NuStar Logistics and the Parish of St. James, which, among other things, converted the interest rate from a weekly rate to a long-term rate. In connection with the reoffering and conversion, we terminated the letters of credit previously issued by various individual banks on our behalf to support the payments required in connection with the GoZone Bonds, and NuStar Energy and NuPOP guaranteed NuStar Logistics’ obligations with respect to the GoZone Bonds. We did not receive any proceeds from the reoffering, and the reoffering did not increase our outstanding debt.

The following table summarizes the GoZone Bonds outstanding as of December 31, 2021:

Series

Date Issued

Amount
Outstanding

Interest Rate

Mandatory
Purchase Date

Maturity Date

(Thousands of Dollars)

Series 2008

June 26, 2008

55,440

6.10

June 1, 2030

June 1, 2038

Series 2010

July 15, 2010

100,000

6.35

n/a

July 1, 2040

Series 2010A

October 7, 2010

43,300

6.35

n/a

October 1, 2040

Series 2010B

December 29, 2010

48,400

6.10

June 1, 2030

December 1, 2040

Series 2011

August 9, 2011

75,000

5.85

June 1, 2025

August 1, 2041

Total

322,140

Interest on the GoZone Bonds accrues from June 3, 2020 and is payable semi-annually on June 1 and December 1 of each year, beginning December 1, 2020. The holders of the Series 2008, Series 2010B and Series 2011 GoZone Bonds are required to tender their bonds at the applicable mandatory purchase date in exchange for 100% of the principal plus accrued and unpaid interest, after which these bonds will potentially be remarketed with a new interest rate established. Each of the Series 2010 and Series 2010A GoZone Bonds is subject to redemption on or after June 1, 2030 by the Parish of St. James, at our option, in whole or in part, at a redemption price of 100% of the principal amount to be redeemed plus accrued interest. The Series 2008, Series 2010B and Series 2011 GoZone Bonds are not subject to optional redemption.

NuStar Logistics’ agreements with the Parish of St. James related to the GoZone Bonds contain (i) customary restrictive covenants that limit the ability of NuStar Logistics and its subsidiaries, to, among other things, create liens or enter into sale-leaseback transactions, consolidations, mergers or asset sales and (ii) a change of control provision that provides each holder the right to require the trustee, with funds provided by NuStar Logistics, to repurchase all or a portion of that holder’s GoZone Bonds upon a change of control at a price equal to 101% of the aggregate principal amount repurchased, plus any accrued and unpaid interest.

Receivables Financing Agreement

NuStar Energy and NuStar Finance LLC (NuStar Finance), a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $100.0 million receivables financing agreement with a third-party lender (the Receivables Financing Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (together with the Receivables Financing Agreement, the Securitization Program). Under the Securitization Program, certain of NuStar Energy’s wholly owned subsidiaries (collectively, the Originators), sell their accounts receivable to NuStar Finance on an ongoing basis, and NuStar Finance provides the newly acquired accounts receivable as collateral for its revolving borrowings under the Receivables Financing Agreement. NuStar Energy provides a performance guarantee in connection with the Securitization Program. The amount available for borrowing is based on the availability of eligible receivables and other customary factors and conditions. The Securitization Program contains various customary affirmative and negative covenants and default, indemnification and termination provisions, and the Receivables Financing Agreement provides for acceleration of amounts owed upon the occurrence of certain specified events. NuStar Finance’s sole activity consists of purchasing such receivables and providing them as collateral under the Securitization Program. NuStar Finance is a separate legal entity and the assets of NuStar Finance, including these accounts receivable, are not available to satisfy the claims of creditors of NuStar Energy, the Originators or their affiliates.

On January 28, 2022, the Receivables Financing Agreement was amended to, among other things: (i) extend the scheduled termination date from September 20, 2023 to January 31, 2025; (ii) reduce the floor rate in the calculation of our borrowing rates; and (iii) replace provisions related to the LIBOR rate of interest with references to SOFR rates of interest. On September 3, 2020, the Receivables Financing Agreement was amended to, among other things: (i) reduce the amount available for borrowing from $125.0 million to $100.0 million, (ii) provide that the failure to satisfy the consolidated debt coverage ratio, as

defined in the Revolving Credit Agreement, would constitute an Event of Default as defined in the Receivables Financing Agreement, and (iii) increase the interest rate.

Prior to the January 28, 2022 amendment described above, borrowings by NuStar Finance under the Receivables Financing Agreement bore interest at the applicable bank rate, as defined under the Receivables Financing Agreement. Following the amendment, borrowings under the Receivables Financing Agreement bear interest, at NuStar Finance’s option, at a base rate or a SOFR rate, each as defined in the Receivables Financing Agreement. As of December 31, 2021 and 2020, accounts receivable totaling $119.2 million and $110.6 million, respectively, were included in the Securitization Program. The weighted average interest rate related to outstanding borrowings under the Securitization Program during the year ended December 31, 2021 was 2.3%.

Term Loan Credit Agreement

On April 19, 2020, NuStar Energy and NuStar Logistics entered into an unsecured term loan credit agreement with certain lenders and Oaktree Fund Administration, LLC, as administrative agent for the lenders. The Term Loan provided for an aggregate commitment of up to $750.0 million pursuant to a three-year unsecured term loan credit facility. NuStar Logistics drew $500.0 million (the Initial Loan) on April 21, 2020 (the Initial Loan Funding Date). We utilized the proceeds from the Initial Loan, net of the original issue discount of $22.5 million (3.0% of the total commitment) and issuance costs of $14.4 million, to repay outstanding borrowings under our Revolving Credit Agreement. The Term Loan bolstered our liquidity to address near-term senior note maturities.

On September 16, 2020, we used a portion of the net proceeds from the issuance of the 5.75% and 6.375% senior notes to repay the $500.0 million of outstanding borrowings under the Term Loan and pay related early repayment premiums totaling $97.6 million. We also recognized costs of $40.3 million related to unamortized debt issuance costs, unamortized discount and a commitment fee, which resulted in a loss from extinguishment of debt of $137.9 million in the third quarter of 2020. On February 16, 2021, we terminated the Term Loan.

Outstanding borrowings bore interest at an aggregate rate of 12.0% per annum, and the Term Loan was subject to a commitment fee in the amount of 5.0% per annum on the average daily undrawn amount of $250.0 million until April 19, 2021.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI http://asc.fasb.org/topic&trid=2208564

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1E
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

+ Details

HEALTH, SAFETY AND ENVIRONMENTAL MATTERS

12 Months Ended

Dec. 31, 2021

Environmental Remediation Obligations [Abstract]

HEALTH, SAFETY AND ENVIRONMENTAL MATTERS

Our operations are subject to extensive international, federal, state and local environmental laws and regulations, in the U.S. and in the other countries in which we operate, including those relating to the discharge of materials into the environment, waste management, remediation, the characteristics and composition of fuels, climate change and greenhouse gases. Our operations are also subject to extensive health, safety and security laws and regulations, including those relating to worker and pipeline safety, pipeline and storage tank integrity and operations security. The principal environmental, health, safety and security risks associated with our operations relate to unauthorized emissions into the air, releases into soil, surface water or groundwater, personal injury and property damage. We have adopted policies, practices, systems and procedures designed to comply with the laws and regulations, and to help minimize and mitigate these risks, limit the liability that could result from such events, prevent material environmental or other damage, ensure the safety of our employees and the public and secure our pipelines, terminals and operations. Compliance with environmental, health, safety and security laws, regulations and related permits increases our capital expenditures and operating expenses, and violation of these laws, regulations or permits could result in significant civil and criminal liabilities, injunctions or other penalties. Future governmental action and regulatory initiatives could result in more restrictive laws and regulations, which could increase required capital expenditures and operating expenses. The risk of additional compliance expenditures, expenses and liabilities are inherent to government-regulated industries, including midstream energy. As a result, there can be no assurances that significant expenditures, expenses and liabilities will not be incurred in the future.

Most of our pipelines are subject to federal regulation by one or more of the following governmental agencies: the Federal Energy Regulatory Commission (the FERC), the Surface Transportation Board (the STB), the Department of Transportation (DOT), the Environmental Protection Agency (EPA) and the Department of Homeland Security. Additionally, our pipelines are subject to the respective jurisdictions of the states those lines traverse.

Environmental and safety exposures and liabilities are difficult to assess and estimate due to unknown factors such as the timing and extent of remediation, the determination of our liability in proportion to other parties, improvements in cleanup technologies and the extent to which environmental and safety laws and regulations may change in the future. Although environmental and safety costs may have a significant impact on the results of operations for any single period, we believe that such costs will not have a material adverse effect on our financial position.

The balance of and changes in the accruals for environmental matters were as follows:


	Year Ended December 31,
	2021		2020
	(Thousands of Dollars)
Balance as of the beginning of year	$	8,373	$	7,938
Additions to accrual	2,044		3,692
Payments	(2,669)		(3,257)

Balance as of the end of year	$	7,748	$	8,373

Accruals for environmental matters are included in the consolidated balance sheets as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Accrued liabilities	$	3,378	$	5,371
Other long-term liabilities	4,370		3,002
Accruals for environmental matters	$	7,748	$	8,373

COMMITMENTS, CONTINGENCIES AND UNCERTAINTIES

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS, CONTINGENCIES AND UNCERTAINTIES

Commitments

Future minimum rental payments applicable to all noncancellable purchase obligations as of December 31, 2021 are as follows:


	Payments Due by Period
	2022		2023		2024		2025		2026		Thereafter		Total
	(Thousands of Dollars)
Purchase obligations	$	10,606	$	5,125	$	2,226	$	1,552	$	753	$	5,466	$	25,728

Our purchase obligations primarily consist of an eleven-year chemical supply agreement related to our pipelines that terminates in 2022 and various service agreements with information technology providers.

Contingencies

We have contingent liabilities resulting from various litigation, claims and commitments. We record accruals for loss contingencies when losses are considered probable and can be reasonably estimated. Legal fees associated with defending the Partnership in legal matters are expensed as incurred. We accrued $0.1 million and $2.6 million for contingent losses as of December 31, 2021 and 2020, respectively. The amount that will ultimately be paid related to such matters may differ from the recorded accruals, and the timing of such payments is uncertain. We evaluate each contingent loss at least quarterly, and more frequently as each matter progresses and develops over time, and we do not believe that the resolution of any particular claim or proceeding, or all matters in the aggregate, would have a material adverse effect on our results of operations, financial position or liquidity.

Uncertainties

The coronavirus, or COVID-19, had a severe negative impact on global economic activity during 2020, significantly reducing demand for petroleum products and increasing the volatility of crude oil prices, beginning in March 2020. While the U.S. economy has demonstrated signs of stabilization and improvement in 2021, ongoing uncertainty surrounding the COVID-19 pandemic has caused and may continue to cause volatility and could have a significant impact on management’s estimates and assumptions in 2022 and beyond.

LEASE ASSETS AND LIABILITIES

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Lessee, operating leases [Text Block]

LEASE ASSETS AND LIABILITIES

Lessee Arrangements

Our operating leases consist primarily of land and dock leases at various terminal facilities. As of December 31, 2021, land and dock leases have remaining terms generally of up to four years and include options to extend, some up to twenty years, which we are reasonably certain to exercise. During 2020, we modified three leases for marine vessels at our Point Tupper terminal facility in order to extend their lease terms by five years. The modifications and related remeasurements resulted in additional lease liabilities and right-of-use assets totaling $20.1 million.

The primary component of our finance lease portfolio is a dock at our Corpus Christi North Beach terminal facility, which includes a commitment for minimum dockage and wharfage throughput volumes. The dock lease has a remaining term of approximately four years and three additional five-year renewal periods, all of which we are reasonably certain to exercise.

Right-of-use assets and lease liabilities included in our consolidated balance sheet were as follows:


		December 31,
	Balance Sheet Location	2021		2020
		(Thousands of Dollars)
Right-of-Use Assets:
Operating	Other long-term assets, net	$	76,867	$	87,443
Finance	Property, plant and equipment, net of accumulated amortization of $13,561 and $8,444	$	71,002	$	73,319

Lease Liabilities:
Operating:
Current	Accrued liabilities	$	10,346	$	10,890
Noncurrent	Other long-term liabilities	65,060		74,899
Total operating lease liabilities		$	75,406	$	85,789
Finance:
Current	Current portion of finance lease obligations	$	3,848	$	3,839
Noncurrent	Long-term debt, less current portion	52,930		54,238
Total finance lease liabilities		$	56,778	$	58,077

As of December 31, 2021, maturities of our operating and finance lease liabilities were as follows:


	Operating Leases		Finance Leases
	(Thousands of Dollars)
2022	$	12,252	$	5,831
2023	10,960		5,705
2024	10,656		5,217
2025	8,705		4,424
2026	5,876		3,979
Thereafter	48,542		52,399
Total lease payments	$	96,991	$	77,555
Less: Interest	21,585		20,777
Present value of lease liabilities	$	75,406	$	56,778

Costs incurred for leases, including costs associated with discontinued operations, were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Operating lease cost	$	15,323	$	16,814	$	29,167
Finance lease cost:
Amortization of right-of-use assets	$	5,251	$	4,700	$	3,748
Interest expense on lease liability	$	2,081	$	2,201	$	2,212
Short-term lease cost	$	14,198	$	15,359	$	19,140
Variable lease cost	$	4,939	$	8,653	$	6,990
Total lease cost	$	41,792	$	47,727	$	61,257

The table below presents additional information regarding our leases.


	2021						2020						2019
	Operating Leases			Finance Leases			Operating Leases			Finance Leases			Operating Leases			Finance Leases
	(Thousands of Dollars, Except Term and Rate Data)
For the year ended December 31:
Cash outflows from operating activities	$	12,829		$	2,090		$	14,487		$	2,208		$	27,567		$	2,027
Cash outflows from financing activities	$	—		$	4,244		$	—		$	4,981		$	—		$	3,700
Right-of-use assets obtained in exchange for lease liabilities	$	3,278		$	3,173		$	20,830		$	3,077		$	2,153		$	4,430
As of December 31:
Weighted-average remaining lease term (in years)	13			18			13			19			15			20
Weighted-average discount rate	3.2		%	3.6		%	3.2		%	3.7		%	3.6		%	3.7		%

Lessee, finance leases [Text Block]

LEASE ASSETS AND LIABILITIES

Lessee Arrangements

Right-of-use assets and lease liabilities included in our consolidated balance sheet were as follows:


		December 31,
	Balance Sheet Location	2021		2020
		(Thousands of Dollars)
Right-of-Use Assets:
Operating	Other long-term assets, net	$	76,867	$	87,443
Finance	Property, plant and equipment, net of accumulated amortization of $13,561 and $8,444	$	71,002	$	73,319

Lease Liabilities:
Operating:
Current	Accrued liabilities	$	10,346	$	10,890
Noncurrent	Other long-term liabilities	65,060		74,899
Total operating lease liabilities		$	75,406	$	85,789
Finance:
Current	Current portion of finance lease obligations	$	3,848	$	3,839
Noncurrent	Long-term debt, less current portion	52,930		54,238
Total finance lease liabilities		$	56,778	$	58,077

As of December 31, 2021, maturities of our operating and finance lease liabilities were as follows:


	Operating Leases		Finance Leases
	(Thousands of Dollars)
2022	$	12,252	$	5,831
2023	10,960		5,705
2024	10,656		5,217
2025	8,705		4,424
2026	5,876		3,979
Thereafter	48,542		52,399
Total lease payments	$	96,991	$	77,555
Less: Interest	21,585		20,777
Present value of lease liabilities	$	75,406	$	56,778

Costs incurred for leases, including costs associated with discontinued operations, were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Operating lease cost	$	15,323	$	16,814	$	29,167
Finance lease cost:
Amortization of right-of-use assets	$	5,251	$	4,700	$	3,748
Interest expense on lease liability	$	2,081	$	2,201	$	2,212
Short-term lease cost	$	14,198	$	15,359	$	19,140
Variable lease cost	$	4,939	$	8,653	$	6,990
Total lease cost	$	41,792	$	47,727	$	61,257

The table below presents additional information regarding our leases.


	2021						2020						2019
	Operating Leases			Finance Leases			Operating Leases			Finance Leases			Operating Leases			Finance Leases
	(Thousands of Dollars, Except Term and Rate Data)
For the year ended December 31:
Cash outflows from operating activities	$	12,829		$	2,090		$	14,487		$	2,208		$	27,567		$	2,027
Cash outflows from financing activities	$	—		$	4,244		$	—		$	4,981		$	—		$	3,700
Right-of-use assets obtained in exchange for lease liabilities	$	3,278		$	3,173		$	20,830		$	3,077		$	2,153		$	4,430
As of December 31:
Weighted-average remaining lease term (in years)	13			18			13			19			15			20
Weighted-average discount rate	3.2		%	3.6		%	3.2		%	3.7		%	3.6		%	3.7		%

Lessor, operating leases [Text Block]

Lessor Arrangements

We have entered into certain revenue arrangements where we are considered to be the lessor. Under the largest of these arrangements, we lease certain of our storage tanks in exchange for a fixed fee, subject to an annual consumer price index adjustment. The operating leases commenced on January 1, 2017, and have initial terms of 10 years with successive automatic renewal terms. We recognized lease revenues from these leases of $41.5 million, $41.3 million, and $40.8 million for the years ended December 31, 2021, 2020, and 2019, respectively, which are included in “Service revenues” in the consolidated statements of income (loss). As of December 31, 2021, we expect to receive minimum lease payments totaling $195.6 million, based upon the consumer price index as of the adoption date. We will recognize these payments ratably over the remaining initial lease term.

The table below presents cost, accumulated depreciation and useful life information related to our storage lease assets, which are included in our “Pipeline, storage and terminals” asset class within property, plant and equipment:


	Estimated Useful Life	December 31,
		2021		2020
	(Years)	(Thousands of Dollars)
Lease storage assets, at cost	30	$	246,841	$	241,664
Less accumulated depreciation		(139,200)		(130,217)
Lease storage assets, net		$	107,641	$	111,447

DERIVATIVES AND FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

FAIR VALUE MEASUREMENTS

DERIVATIVES AND FAIR VALUE MEASUREMENTS

Derivative Instruments

We utilize various derivative instruments to manage our exposure to interest rate risk and commodity price risk. Our risk management policies and procedures are designed to monitor interest rates, futures and swap positions and over-the-counter positions, as well as physical commodity volumes, grades, locations and delivery schedules, to help ensure that our hedging activities address our market risks.

Commodity Price Risk. The results of operations for the fuels marketing segment depend largely on the margin between our cost and the sales prices of the products we market. Therefore, the results of operations for this segment are more sensitive to changes in commodity prices compared to the operations of the pipeline and storage segments. Since our fuels marketing operations expose us to commodity price risk, we enter into derivative instruments to mitigate the effect of commodity price fluctuations on our operations. Derivative financial instruments associated with commodity price risk with respect to our petroleum product inventories and related firm commitments to purchase and/or sell such inventories were not material for any period presented.

Interest Rate Risk. We were a party to certain interest rate swap agreements to manage our exposure to changes in interest rates, which consisted of forward-starting interest rate swap agreements related to forecasted debt issuances. We entered into these swaps in order to hedge the risk of fluctuations in the required interest payments attributable to changes in the benchmark interest rate during the period from the effective date of the swap to the issuance of the forecasted debt. Under the terms of the swaps, we paid a weighted-average fixed rate and received a rate based on the three-month USD LIBOR. These swaps qualified as cash flow hedges, and we designated them as such. We recorded mark-to-market adjustments as a component of AOCI, and the amount in AOCI is recognized in “Interest expense, net” as the forecasted interest payments occur or if the interest payments are probable not to occur. In June 2020, in connection with the reoffering and conversion of the GoZone Bonds, we terminated forward-starting interest rate swaps with an aggregate notional amount of $250.0 million and paid $49.2 million, which will be amortized into “Interest expense, net” as the related forecasted interest payments occur. The termination payments are included in cash flows from financing activities on the consolidated statements of cash flows. Please see Note 2 for additional information. In conjunction with the early repayment of our $250.0 million 4.75% senior notes due February 1, 2022 in the fourth quarter of 2021, we reclassified a loss of $0.8 million from AOCI to “Interest expense, net.”

The remaining fair value amounts associated with unwound interest rate swap agreements are presented in the table below. These amounts are amortized ratably over the remaining life of the related debt instrument into “Interest expense, net” on the consolidated statements of income (loss).


		December 31,
Unwound Interest Rate Swap Agreements	Balance Sheet Location	2021		2020
		(Thousands of Dollars)

Fixed-to-floating	Long-term debt, less current portion	$	—	$	1,363
Forward-starting	Accumulated other comprehensive loss	$	(36,486)	$	(42,150)

Our forward-starting interest rate swaps had the following impact on earnings:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Change in unrealized loss on cash flow hedges	$	—	$	(30,291)	$	(19,045)
Reclassification of loss on cash flow hedges to interest expense, net	$	5,664	$	4,265	$	3,814

As of December 31, 2021, we expect to reclassify a loss of $2.1 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swap agreements.

Fair Value Measurements

We segregate the inputs used in measuring fair value into three levels: Level 1, defined as observable inputs such as quoted prices for identical assets or liabilities in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets that are not active; and Level 3, defined as unobservable inputs for which little

or no market data exists. We consider counterparty credit risk and our own credit risk in the determination of all estimated fair values.

We recognize cash equivalents, receivables, payables and debt in our consolidated balance sheets at their carrying amounts. The fair values of these financial instruments, except for long-term debt other than finance leases, approximate their carrying amounts. The estimated fair values and carrying amounts of the long-term debt, excluding finance leases, were as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Fair value	$	3,459,153	$	3,799,378
Carrying amount	$	3,130,625	$	3,539,258

We have estimated the fair value of our publicly traded notes based upon quoted prices in active markets; therefore, we determined that the fair value of our publicly traded notes falls in Level 1 of the fair value hierarchy. With regard to our other debt, for which a quoted market price is not available, we have estimated the fair value using a discounted cash flow analysis using current incremental borrowing rates for similar types of borrowing arrangements and determined that the fair value falls in Level 2 of the fair value hierarchy. The carrying value includes net fair value adjustments, unamortized discounts and unamortized debt issuance costs.

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

12 Months Ended

Dec. 31, 2021

Temporary Equity Disclosure [Abstract]

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

Series D Preferred Units Issued and Outstanding

On June 26, 2018, the Partnership entered into a purchase agreement (the Series D Preferred Unit Purchase Agreement) with investment funds, accounts and entities (collectively, the Purchasers) managed by EIG Management Company, LLC and FS/EIG Advisors, LLC to issue and sell Series D Cumulative Convertible Preferred Units (Series D Preferred Units) in a private placement. The following is a summary of our Series D Preferred Units issued and outstanding as of December 31, 2021:


	Original Issuance Date	Number of Units Issued and Outstanding	Purchase Price per Unit
Initial Closing	June 29, 2018	15,760,441	$	25.38
Second Closing	July 13, 2018	7,486,209	$	25.38
Total		23,246,650

The Series D Preferred Units rank equal to other classes of preferred units and senior to common units in the Partnership with respect to distribution rights and rights upon liquidation. The Series D Preferred Units generally vote on an as-converted basis with the common units and have certain class voting rights with respect to a limited number of matters as set forth in the partnership agreement. The Partnership is required to use its commercially reasonable efforts to register the Series D Preferred Units after the second anniversary of the Initial Closing, no later than one year after receipt of a written request from holders holding a majority of the Series D Preferred Units to register the Series D Preferred Units. If the Partnership fails to cause such registration statement to become effective by the applicable date, the Partnership will be required to pay certain amounts to the holders as liquidated damages.

Series D Preferred Units Distributions

Distributions on the Series D Preferred Units are payable out of any legally available funds, accrue and are cumulative from the issuance dates and are payable on the 15th day (or next business day) of each of March, June, September and December, beginning September 17, 2018, to holders of record on the first business day of each payment month. The distribution rates on the Series D Preferred Units are as follows: (i) 9.75%, or $57.6 million, per annum ($0.619 per unit per distribution period) for the first two years; (ii) 10.75%, or $63.4 million, per annum ($0.682 per unit per distribution period) for years three through five; and (iii) the greater of 13.75%, or $81.1 million, per annum ($0.872 per unit per distribution period) or the distribution per common unit thereafter. While the Series D Preferred Units are outstanding, the Partnership will be prohibited from paying distributions on any junior securities, including the common units, unless full cumulative distributions on the Series D Preferred Units (and any parity securities) have been, or contemporaneously are being, paid or set aside for payment through the most recent Series D Preferred Unit distribution payment date. Any Series D Preferred Unit distributions in excess of $0.635 per unit may be paid, in the Partnership’s sole discretion, in additional Series D Preferred Units, with the remainder paid in cash.

If we fail to pay in full any Series D Preferred Unit distribution amount, then, until we pay such distributions in full, the applicable distribution rate for each of those distribution periods shall be increased by $0.048 per Series D Preferred Unit. In addition, if we fail to pay in full any Series D Preferred Unit distribution amount for three consecutive distribution periods, then until we pay such distributions in full: (i) each holder of the Series D Preferred Units may elect to convert its Series D Preferred Units into common units on a one-for-one basis, plus any unpaid Series D distributions, (ii) one person selected by the holders holding a majority of the outstanding Series D Preferred Units shall become an additional member of our board of directors and (iii) we will not be permitted to incur any indebtedness (as defined in the Revolving Credit Agreement) or engage in any acquisitions or asset sales in excess of $50.0 million without the consent of the holders holding a majority of the outstanding Series D Preferred Units. In addition, we will permanently lose the ability to pay any part of the distributions on the Series D Preferred Units in the form of additional Series D Preferred Units.

In January 2022, our board of directors declared a distribution of $0.682 per Series D Preferred Unit to be paid on March 15, 2022.

Series D Preferred Units Conversion and Redemption Features

On or after June 29, 2020, each holder of Series D Preferred Units may convert all or any portion of its Series D Preferred Units into common units on a one-for-one basis (plus any unpaid Series D distributions), subject to anti-dilution adjustments, at any time, but not more than once per quarter, so long as any conversion is for at least $50.0 million based on the Purchase Price per Unit (or such lesser amount representing all of a holder’s Series D Preferred Units).

The Partnership may redeem all or any portion of the Series D Preferred Units, in an amount not less than $50.0 million for cash at a redemption price equal to, as applicable: (i) $31.73 per Series D Preferred Unit at any time on or after June 29, 2023 but prior to June 29, 2024; (ii) $30.46 per Series D Preferred Unit at any time on or after June 29, 2024 but prior to June 29, 2025; (iii) $29.19 per Series D Preferred Unit at any time on or after June 29, 2025; plus, in each case, the sum of any unpaid distributions on the applicable Series D Preferred Unit plus the distributions prorated for the number of days elapsed (not to exceed 90) in the period of redemption (Series D Partial Period Distributions). The holders have the option to convert the units prior to such redemption as discussed above.

Additionally, at any time on or after June 29, 2028, each holder of Series D Preferred Units will have the right to require the Partnership to redeem all of the Series D Preferred Units held by such holder at a redemption price equal to $29.19 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions. If a holder of Series D Preferred Units exercises its redemption right, the Partnership may elect to pay up to 50% of such amount in common units (which shall be valued at 93% of a volume-weighted average trading price of the common units); provided, that the common units to be issued do not, in the aggregate, exceed 15% of NuStar Energy’s common equity market capitalization at the time.

Series D Preferred Units Change of Control

Upon certain events involving a change of control, each holder of the Series D Preferred Units may elect to: (i) convert its Series D Preferred Units into common units on a one-for-one basis, plus any unpaid Series D distributions; (ii) require the Partnership to redeem its Series D Preferred Units for an amount equal to the sum of (a) $29.82 per Series D Preferred Unit plus (b) any unpaid Series D distributions plus (c) the applicable distribution amount for the distribution periods ending after the change of control event and prior to (but including) the fourth anniversary of the Initial Closing; (iii) if the Partnership is the surviving entity and its common units continue to be listed, continue to hold its Series D Preferred Units; or (iv) if the Partnership will not be the surviving entity, or it will be the surviving entity but its common units will cease to be listed, require the Partnership to use its commercially reasonable efforts to deliver a security in the surviving entity that has substantially similar terms as the Series D Preferred Units; however, if the Partnership is unable to deliver a mirror security, each holder is still entitled to option (i) or (ii) above.

Series D Preferred Units Accounting Treatment

The Series D Preferred Units include redemption provisions at the option of the holders of the Series D Preferred Units and upon a Series D Change of Control (as defined in the partnership agreement), which are outside the Partnership’s control. Therefore, the Series D Preferred Units are presented in the mezzanine section of the consolidated balance sheets. The Series D Preferred Units have been recorded at their issuance date fair value, net of issuance costs. We reassess the presentation of the Series D Preferred Units in our consolidated balance sheets on a quarterly basis.

The Series D Preferred Units are subject to accretion from their carrying value at the issuance date to the redemption value, which is based on the redemption right of the Series D Preferred Unit holders that may be exercised at any time on or after June 29, 2028, using the effective interest method over a period of ten years. In the calculation of net income per unit, the

accretion is treated in the same manner as a distribution and deducted from net income to arrive at net income attributable to common units.

PARTNERS' EQUITY

12 Months Ended

Dec. 31, 2021

Partners' Capital Notes [Abstract]

PARTNERS' EQUITY

PARTNERS’ EQUITY

Series A, B and C Preferred Units

The following is a summary of our Series A, Series B and Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively the Series A, B and C Preferred Units) issued and outstanding as of December 31, 2021:


Units	Original Issuance Date	Number of Units Issued and Outstanding	Price per Unit		Fixed Distribution Rate per Annum (as a Percentage of the $25.00 Liquidation Preference per Unit)		Fixed Distribution Rate per Unit per Annum		Fixed Distribution per Annum (in thousands of dollars)		Optional Redemption Date/Date at Which Distribution Rate Becomes Floating	Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit)
Series A Preferred Units	November 25, 2016	9,060,000	$	25.00	8.50	%	$	2.125	$	19,252	December 15, 2021	Three-month LIBOR plus 6.766%
Series B Preferred Units	April 28, 2017	15,400,000	$	25.00	7.625	%	$	1.90625	$	29,357	June 15, 2022	Three-month LIBOR plus 5.643%
Series C Preferred Units	November 30, 2017	6,900,000	$	25.00	9.00	%	$	2.25	$	15,525	December 15, 2022	Three-month LIBOR plus 6.88%

The Series A Preferred Units switched from a fixed distribution rate to a floating rate on December 15, 2021, with the floating rate set forth below for the period indicated:


Period	Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)

December 15, 2021 - March 14, 2022	$	0.43606	$	3,951

Distributions on the Series A, B and C Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or the next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month. The Series A, B and C Preferred Units rank equal to each other and to the Series D Preferred Units, and senior to all of our other classes of equity securities with respect to distribution rights and rights upon liquidation.

In January 2022, our board of directors declared quarterly distributions with respect to the Series A, B and C Preferred Units to be paid on March 15, 2022.

We may redeem any of our outstanding Series A, B and C Preferred Units at any time on or after the optional redemption date set forth above for each series of the Series A, B and C Preferred Units, in whole or in part, at a redemption price of $25.00 per unit plus an amount equal to all accumulated and unpaid distributions to, but not including, the date of redemption, whether or not declared. We may also redeem the Series A, B and C Preferred Units upon the occurrence of certain rating events or a change of control as defined in our partnership agreement. In the case of the latter instance, if we choose not to redeem the Series A, B and C Preferred Units, those preferred unitholders may have the ability to convert their Series A, B and C Preferred Units to common units at the then applicable conversion rate. Holders of the Series A, B and C Preferred Units have no voting rights except for certain exceptions set forth in our partnership agreement.

Common Units

Issuances of Common Units. In the fourth quarter of 2019, we issued 527,426 common units at a price of $28.44 per unit to William E. Greehey, Chairman of the Board of Directors of NuStar GP, LLC. We used the proceeds of $15.0 million from the sale of these units for general partnership purposes.

The following table shows the balance of and changes in the number of our common units outstanding:


	Year Ended December 31,
	2021	2020	2019
Balance as of the beginning of year	109,468,127	108,527,806	107,225,156
Issuance of units	—	—	527,426
Unit-based compensation (refer to Note 22 for discussion)	518,146	940,321	775,224
Balance as of the end of year	109,986,273	109,468,127	108,527,806

Cash Distributions. We make quarterly distributions to common unitholders of 100% of our “Available Cash,” generally defined as cash receipts less cash disbursements, including distributions to our preferred units, and cash reserves established by the general partner, in its sole discretion. These quarterly distributions are declared and paid within 45 days subsequent to each quarter-end. The common unitholders receive a distribution each quarter as determined by the board of directors, subject to limitation by the distributions in arrears, if any, on our preferred units.

The following table summarizes information about cash distributions to our common limited partners applicable to the period in which the distributions were earned:


	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
Quarter ended:
December 31, 2021	$	0.40	$	44,008	February 8, 2022	February 14, 2022
September 30, 2021	0.40		43,814		November 8, 2021	November 12, 2021
June 30, 2021	0.40		43,814		August 6, 2021	August 12, 2021
March 31, 2021	0.40		43,834		May 10, 2021	May 14, 2021
Year ended December 31, 2021	$	1.60	$	175,470

Year ended December 31, 2020	$	1.60	$	174,873
Year ended December 31, 2019	$	2.40	$	259,136

Accumulated Other Comprehensive Income (Loss)

The balance of and changes in the components included in AOCI were as follows:


	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of January 1, 2019	$	(47,299)	$	(893)	$	(6,686)	$	(54,878)
Other comprehensive income (loss) before reclassification adjustments	3,527		(19,045)		1,000		(14,518)
Net gain on pension costs reclassified into other income, net	—		—		(2,314)		(2,314)
Net loss on cash flow hedges reclassified into interest expense, net	—		3,814		—		3,814

Other comprehensive income (loss)	3,527		(15,231)		(1,314)		(13,018)
Balance as of December 31, 2019	(43,772)		(16,124)		(8,000)		(67,896)
Other comprehensive income (loss) before reclassification adjustments	1,410		(30,291)		(2,924)		(31,805)
Net gain on pension costs reclassified into other income, net	—		—		(1,220)		(1,220)
Net loss on cash flow hedges reclassified into interest expense, net	—		4,265		—		4,265

Other comprehensive income (loss)	1,410		(26,026)		(4,144)		(28,760)
Balance as of December 31, 2020	(42,362)		(42,150)		(12,144)		(96,656)
Other comprehensive income before reclassification adjustments	601		—		17,721		18,322
Net gain on pension costs reclassified into other income, net	—		—		(1,308)		(1,308)
Net loss on cash flow hedges reclassified into interest expense, net	—		5,664		—		5,664

Other comprehensive income	601		5,664		16,413		22,678
Balance as of December 31, 2021	$	(41,761)	$	(36,486)	$	4,269	$	(73,978)

NET INCOME (LOSS) PER COMMON UNIT

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

NET INCOME (LOSS) PER COMMON UNIT

As discussed in Note 17, the Series D Preferred Units are convertible into common units at the option of the holder at any time on or after June 29, 2020. As such, we calculated the dilutive effect of the Series D Preferred Units using the if-converted method. The effect of the assumed conversion of the Series D Preferred Units outstanding was antidilutive for each of the years ended December 31, 2021, 2020 and 2019; therefore, we did not include such conversion in the computation of diluted net (loss) income per common unit.

Contingently issuable performance units are included as dilutive potential common units if it is probable that the performance measures will be achieved, unless to do so would be antidilutive. For the years ended December 31, 2021 and 2020, we determined that it was probable that the performance measures would be achieved, but the effect would be antidilutive; therefore, we did not include any contingently issuable performance units as dilutive common units in the computation below.

The following table details the calculation of net income (loss) per common unit:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income (loss)	$	38,225	$	(198,983)	$	(105,693)
Distributions to preferred limited partners	(127,399)		(124,882)		(121,693)
Distributions to common limited partners	(175,470)		(174,873)		(259,136)
Distribution equivalent rights to restricted units	(2,396)		(2,093)		(2,659)
Distributions in excess of income (loss)	$	(267,040)	$	(500,831)	$	(489,181)

Distributions to common limited partners	$	175,470	$	174,873	$	259,136
Allocation of distributions in excess of income (loss)	(267,040)		(500,831)		(489,181)
Series D Preferred Unit accretion (refer to Note 17)	(16,903)		(17,626)		(18,085)
Net loss attributable to common units	$	(108,473)	$	(343,584)	$	(248,130)

Basic weighted-average common units outstanding	109,585,635		109,155,117		107,789,030

Diluted common units outstanding:
Basic weighted-average common units outstanding	109,585,635		109,155,117		107,789,030
Effect of dilutive potential common units	—		—		65,669
Diluted weighted-average common units outstanding	109,585,635		109,155,117		107,854,699

Basic and diluted net loss per common unit	$	(0.99)	$	(3.15)	$	(2.30)

SUPPLEMENTAL CASH FLOW INFORMATION

12 Months Ended

Dec. 31, 2021

Supplemental Cash Flow Information [Abstract]

STATEMENTS OF CASH FLOWS

SUPPLEMENTAL CASH FLOW INFORMATION

Changes in current assets and current liabilities were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	(2,105)	$	14,589	$	(23,480)

Inventories	(5,585)		1,340		(866)

Prepaid and other current assets	(1,710)		(3,326)		(5,103)
Increase (decrease) in current liabilities:
Accounts payable	10,202		(25,455)		8,068

Accrued interest payable	(16,708)		12,922		1,632
Accrued liabilities	4,448		7,886		(19,740)
Taxes other than income tax	(2,689)		3,972		(5,276)

Changes in current assets and current liabilities	$	(14,147)	$	11,928	$	(44,765)

The above changes in current assets and current liabilities differ from changes between amounts reflected in the applicable consolidated balance sheets due to:

•the change in the amount accrued for capital expenditures;

•the effect of foreign currency translation;

•payments for the termination of interest rate swaps included in cash flows from financing activities;

•the effect of accrued compensation expense paid with fully vested common unit awards;

•the reclassification of certain assets and liabilities to “Assets held for sale” and “Liabilities held for sale” on the consolidated balance sheets (please refer to Note 4 for additional discussion); and

•current assets and current liabilities disposed of during the period.

Cash flows related to interest and income taxes were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	218,181	$	204,511	$	176,859
Cash paid for income taxes, net of tax refunds received	$	5,491	$	3,260	$	6,817

Restricted cash is included in "Other long-term assets, net" on the consolidated balance sheets. “Cash, cash equivalents and restricted cash” on the consolidated statements of cash flows was included in the consolidated balance sheets as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Cash and cash equivalents	$	5,637	$	153,625
Other long-term assets, net	8,802		8,801
Cash, cash equivalents and restricted cash	$	14,439	$	162,426

EMPLOYEE BENEFIT PLANS

12 Months Ended

Dec. 31, 2021

Retirement Benefits [Abstract]

EMPLOYEE BENEFIT PLANS

Thrift Plans

The NuStar Thrift Plan (the Thrift Plan) is a qualified defined contribution plan that became effective June 26, 2006. Participation in the Thrift Plan is voluntary and open to substantially all our domestic employees upon their dates of hire. Thrift Plan participants can contribute from 1% up to 30% of their total annual compensation to the Thrift Plan in the form of pre-tax and/or after tax employee contributions. We make matching contributions in an amount equal to 100% of each participant’s employee contributions up to a maximum of 6% of the participant’s total annual compensation. The matching contributions to the Thrift Plan for the years ended December 31, 2021, 2020 and 2019 totaled $7.6 million, $7.8 million and $7.6 million, respectively.

The NuStar Excess Thrift Plan (the Excess Thrift Plan) is a nonqualified deferred compensation plan that became effective July 1, 2006. The Excess Thrift Plan provides benefits to those employees whose compensation and/or annual contributions under the Thrift Plan are subject to the limitations applicable to qualified retirement plans under the Code.

We also maintain other defined contribution plans for certain international employees located in Canada. We maintained plans for international employees in the Caribbean Netherlands prior to the St. Eustatius Disposition on July 29, 2019. For the years ended December 31, 2021, 2020 and 2019, our costs for these plans totaled $0.6 million, $0.5 million and $0.9 million, respectively.

Pension and Other Postretirement Benefits

The NuStar Pension Plan (the Pension Plan) is a qualified non-contributory defined benefit pension plan that provides eligible U.S. employees with retirement income as calculated under a cash balance formula. Under the cash balance formula, benefits are determined based on age, years of vesting service and interest credits, and employees become fully vested in their benefits upon attaining three years of vesting service. Prior to January 1, 2014, eligible employees were covered under either a cash balance formula or a final average pay formula (FAP). Effective January 1, 2014, the Pension Plan was amended to freeze the FAP benefits as of December 31, 2013, and going forward, all eligible employees are covered under the cash balance formula discussed above.

We also maintain an excess pension plan (the Excess Pension Plan), which is a nonqualified deferred compensation plan that provides benefits to a select group of management or other highly compensated employees. Neither the Excess Thrift Plan nor the Excess Pension Plan is intended to constitute either a qualified plan under the provisions of Section 401 of the Code or a funded plan subject to the Employee Retirement Income Security Act.

The Pension Plan and Excess Pension Plan are collectively referred to as the Pension Plans in the tables and discussion below. Our other postretirement benefit plans include a contributory medical benefits plan for U.S. employees who retired prior to April 1, 2014 and, for employees who retire on or after April 1, 2014, a partial reimbursement for eligible third-party health care premiums. We use December 31 as the measurement date for our pension and other postretirement plans.

The changes in the benefit obligation, the changes in fair value of plan assets, the funded status and the amounts recognized in the consolidated balance sheets for our Pension Plans and other postretirement benefit plans as of and for the years ended December 31, 2021 and 2020 were as follows:


	Pension Plans				Other Postretirement Benefit Plans
	2021		2020		2021		2020
	(Thousands of Dollars)
Change in benefit obligation:
Benefit obligation, January 1	$	186,685	$	167,257	$	14,680	$	13,196
Service cost	9,978		9,174		593		529
Interest cost	4,084		4,693		326		399
Benefits paid (a)	(19,366)		(9,520)		(257)		(281)
Participant contributions	—		—		44		44
Actuarial (gain) loss	(694)		15,081		884		793
Other	(780)		—		—		—
Benefit obligation, December 31	$	179,907	$	186,685	$	16,270	$	14,680
Change in plan assets:
Plan assets at fair value, January 1	$	182,727	$	159,036	$	—	$	—
Actual return on plan assets	26,425		21,758		—		—
Employer contributions	52		11,453		213		237
Benefits paid (a)	(19,366)		(9,520)		(257)		(281)
Participant contributions	—		—		44		44
Plan assets at fair value, December 31	$	189,838	$	182,727	$	—	$	—
Reconciliation of funded status:
Fair value of plan assets at December 31	$	189,838	$	182,727	$	—	$	—
Less: Benefit obligation at December 31	179,907		186,685		16,270		14,680
Funded status at December 31	$	9,931	$	(3,958)	$	(16,270)	$	(14,680)
Amounts recognized in the consolidated balance sheets (b):
Other long-term assets, net	$	14,945	$	—	$	—	$	—
Accrued liabilities	(467)		(382)		(442)		(352)
Other long-term liabilities	(4,547)		(3,576)		(15,828)		(14,328)
Net pension asset (liability)	$	9,931	$	(3,958)	$	(16,270)	$	(14,680)

Accumulated benefit obligation	$	171,899	$	181,263	$	16,270	$	14,680

(a)Benefit payments for the year ended December 31, 2021 include lump-sum payments of $9.6 million to participants of the Pension Plans following the Eastern U.S. Terminals Disposition on October 8, 2021 and the Texas City Sale on December 7, 2020.

(b)For the Pension Plan, since assets exceed the present value of expected benefit payments for the next 12 months, all of the liability is noncurrent. For the Excess Pension Plan and the other postretirement benefit plans, since there are no assets, the current liability is the present value of expected benefit payments for the next 12 months; the remainder is noncurrent.

The actuarial (gain) loss related to the benefit obligation for our pension plans was primarily attributable to an increase in the discount rates used to determine the benefit obligation from 2.84% to 3.10% in 2021 and a decrease from 3.34% to 2.84% in 2020. The fair value of our plan assets is affected by the return on plan assets resulting primarily from the performance of equity and bond markets during the period.

The Excess Pension Plan has no plan assets and an accumulated benefit obligation of $4.3 million and $3.8 million as of December 31, 2021 and 2020, respectively. The accumulated benefit obligation is the present value of benefits earned to date, while the projected benefit obligation may include future salary increase assumptions. The projected benefit obligation for the Excess Pension Plan was $5.0 million and $3.8 million as of December 31, 2021 and 2020, respectively.

The components of net periodic benefit cost (income) related to our Pension Plans and other postretirement benefit plans were as follows:


	Pension Plans						Other Postretirement Benefit Plans
	Year Ended December 31,						Year Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of Dollars)
Service cost	$	9,978	$	9,174	$	9,549	$	593	$	529	$	431
Interest cost	4,084		4,693		5,480		326		399		453
Expected return on plan assets	(9,233)		(8,972)		(8,015)		—		—		—
Amortization of prior service credit	(2,057)		(2,057)		(2,057)		(1,145)		(1,145)		(1,145)
Amortization of net actuarial loss	2,279		1,845		846		176		137		42
Other	(561)		136		—		—		—		—
Net periodic benefit cost (income)	$	4,490	$	4,819	$	5,803	$	(50)	$	(80)	$	(219)

We amortize prior service costs and credits on a straight-line basis over the average remaining service period of employees expected to receive benefits under our Pension Plans and other postretirement benefit plans (“Amortization of prior service credit” in table above). We amortize the actuarial gains and losses that exceed 10% of the greater of the projected benefit obligation or market-related value of plan assets (smoothed asset value) over the average remaining service period of active employees expected to receive benefits under our Pension Plans and other postretirement benefit plans (“Amortization of net actuarial loss” in table above).

The service cost component of net periodic benefit cost (income) is reported in “General and administrative expenses” and “Operating expenses” on the consolidated statements of income (loss), and the remaining components of net periodic benefit cost (income) are reported in “Other income (expense), net.”

Adjustments to other comprehensive income (loss) related to our Pension Plans and other postretirement benefit plans were as follows:


	Pension Plans						Other Postretirement Benefit Plans
	Year Ended December 31,						Year Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of Dollars)
Net unrecognized gain (loss) arising during the year:
Net actuarial gain (loss)	$	18,666	$	(2,159)	$	2,545	$	(884)	$	(793)	$	(1,559)

Net (gain) loss reclassified into income:
Amortization of prior service credit	(2,057)		(2,057)		(2,057)		(1,145)		(1,145)		(1,145)
Amortization of net actuarial loss	2,279		1,845		846		176		137		42
Other	(561)		—		—		—		—		—
Net gain reclassified into income	(339)		(212)		(1,211)		(969)		(1,008)		(1,103)

Income tax (expense) benefit	(61)		28		14		—		—		—
Total changes to other comprehensive income (loss)	$	18,266	$	(2,343)	$	1,348	$	(1,853)	$	(1,801)	$	(2,662)

The amounts recorded as a component of “Accumulated other comprehensive loss” on the consolidated balance sheets related to our Pension Plans and other postretirement benefit plans were as follows:


	Pension Plans				Other Postretirement Benefit Plans
	December 31,				December 31,
	2021		2020		2021		2020
	(Thousands of Dollars)
Unrecognized actuarial loss	$	(3,748)	$	(24,878)	$	(4,554)	$	(3,846)
Prior service credit	7,630		10,433		4,884		6,029
Deferred tax asset	57		118		—		—
Accumulated other comprehensive income (loss), net of tax	$	3,939	$	(14,327)	$	330	$	2,183

Investment Policies and Strategies

The investment policies and strategies for the assets of our qualified Pension Plan incorporate a well-diversified approach that is expected to earn long-term returns from capital appreciation and a growing stream of current income. This approach recognizes that assets are exposed to risk, and the market value of the Pension Plan’s assets may fluctuate from year to year. Risk tolerance is determined based on our financial ability to withstand risk within the investment program and the willingness to accept return volatility. In line with the investment return objective and risk parameters, the Pension Plan’s mix of assets includes a diversified portfolio of equity and fixed-income instruments. The aggregate asset allocation is reviewed on an annual basis. As of December 31, 2021, the target allocations for plan assets were 65% equity securities and 35% fixed income investments, with certain fluctuations permitted.

The overall expected long-term rate of return on plan assets for the Pension Plan is estimated using various models of asset returns. Model assumptions are derived using historical data with the assumption that capital markets are informationally efficient. Three models are used to derive the long-term expected returns for each asset class. Since each method has distinct advantages and disadvantages and differing results, an equal weighted average of the methods’ results is used.

Fair Value of Plan Assets

We disclose the fair value for each major class of plan assets in the Pension Plan in three levels: Level 1, defined as observable inputs such as quoted prices for identical assets or liabilities in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets that are not active; and Level 3, defined as unobservable inputs for which little or no market data exists.

The major classes of plan assets measured at fair value for the Pension Plan were as follows:


	December 31, 2021
	Level 1		Level 2		Level 3		Total
	(Thousands of Dollars)
Cash equivalent securities	$	710	$	—	$	—	$	710
Equity securities:
U.S. large cap equity fund (a)	—		110,672		—		110,672
International stock index fund (b)	17,708		—		—		17,708
Fixed income securities:
Bond market index fund (c)	60,748		—		—		60,748
Total	$	79,166	$	110,672	$	—	$	189,838


	December 31, 2020
	Level 1		Level 2		Level 3		Total
	(Thousands of Dollars)
Cash equivalent securities	$	2,125	$	—	$	—	$	2,125
Equity securities:
U.S. large cap equity fund (a)	—		104,857		—		104,857
International stock index fund (b)	20,732		—		—		20,732
Fixed income securities:
Bond market index fund (c)	55,013		—		—		55,013
Total	$	77,870	$	104,857	$	—	$	182,727

(a)This fund is a low-cost equity index fund not actively managed that tracks the S&P 500. Fair values were estimated using pricing models, quoted prices of securities with similar characteristics or discounted cash flows.

(b)This fund tracks the performance of the Total International Composite Index.

(c)This fund tracks the performance of the Barclays Capital U.S. Aggregate Bond Index.

Contributions to the Pension Plans

For the year ended December 31, 2021, we contributed $0.1 million and $0.2 million to the Pension Plans and other postretirement benefit plans, respectively. During 2022, we expect to contribute approximately $9.5 million and $0.4 million to the Pension Plans and other postretirement benefit plans, respectively. We will monitor our funding status in 2022 to determine if any contributions are required by regulations or laws, or with respect to unfunded plans, necessary to fund current benefits.

Estimated Future Benefit Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid for the years ending December 31:


	Pension Plans		Other Postretirement Benefit Plans
	(Thousands of Dollars)
2022	$	10,652	$	442
2023	$	11,232	$	497
2024	$	11,212	$	531
2025	$	12,266	$	582
2026	$	12,109	$	640
2027-2031	$	65,477	$	4,003

Assumptions

The weighted-average assumptions used to determine the benefit obligations were as follows:


	Pension Plans				Other Postretirement Benefit Plans
	December 31,				December 31,
	2021		2020		2021		2020
Discount rate	3.10	%	2.84	%	3.08	%	2.83	%
Rate of compensation increase	3.99	%	3.51	%	n/a		n/a
Cash balance interest crediting rate	2.00	%	2.00	%	n/a		n/a

The weighted-average assumptions used to determine the net periodic benefit cost (income) were as follows:


	Pension Plans						Other Postretirement Benefit Plans
	Year Ended December 31,						Year Ended December 31,
	2021		2020		2019		2021		2020		2019
Discount rate	2.84	%	3.34	%	4.40	%	2.83	%	3.43	%	4.53	%
Expected long-term rate of return on plan assets	6.00	%	6.50	%	6.50	%	n/a		n/a		n/a
Rate of compensation increase	3.51	%	3.51	%	3.51	%	n/a		n/a		n/a
Cash balance interest crediting rate	2.00	%	2.00	%	2.90	%	n/a		n/a		n/a

The assumed health care cost trend rates were as follows:


	December 31,
	2021		2020
Health care cost trend rate assumed for next year	6.84	%	6.84	%
Rate to which the cost trend rate was assumed to decrease (the ultimate trend rate)	5.00	%	5.00	%
Year that the rate reaches the ultimate trend rate	2028		2028

We sponsor a contributory postretirement health care plan for employees who retired prior to April 1, 2014. The plan has an annual limitation (a cap) on the increase of the employer’s share of the cost of covered benefits. The cap on the increase in employer’s cost is 2.5% per year.

- Definition

The entire disclosure for retirement benefits.

+ References

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+ Details

UNIT-BASED COMPENSATION

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

UNIT-BASED COMPENSATION

Overview

2019 LTIP. In April 2019, our common unitholders approved the 2019 Long-Term Incentive Plan (2019 LTIP) for eligible employees, consultants and directors of NuStar Energy L.P., and of NuStar GP, LLC, and their respective affiliates who perform services for us and our subsidiaries. The 2019 LTIP allows for the awarding of (i) options; (ii) restricted units; (iii) distribution equivalent rights (DERs); (iv) performance cash; (v) performance units; and (vi) unit awards. DERs entitle the participant to receive cash equal to cash distributions made on any award prior to its vesting. The 2019 LTIP, as amended and restated on April 29, 2021, permits the granting of awards totaling an aggregate of 5,000,000 common units, and is subject to adjustment. The 2019 LTIP generally will be administered by the compensation committee of our board of directors. As of December 31, 2021, a total of 2,179,072 common units remained available to be awarded under the 2019 LTIP.

Other Plans. We sponsor the NuStar GP, LLC Fifth Amended and Restated 2000 Long-Term Incentive Plan, as amended (2000 LTIP), and the NuStar GP Holdings, LLC Long-Term Incentive Plan, as amended (2006 LTIP). Effective with the approval of the 2019 LTIP in April 2019, the 2000 LTIP and the 2006 LTIP terminated with respect to new grants; however, unvested restricted unit awards granted under the 2000 LTIP and the 2006 LTIP remain outstanding as of December 31, 2021.

The following table summarizes information pertaining to all of our long-term incentive plans:


	Units Outstanding December 31,			Compensation Expense Year Ended December 31,
	2021	2020	2019	2021		2020		2019
				(Thousands of Dollars)
Restricted units:
Domestic employees	2,520,436	2,235,125	1,223,143	$	11,892	$	10,205	$	9,437
Non-employee directors (NEDs)	129,312	98,769	61,349	856		631		774
International employees	21,760	19,987	10,243	139		58		711
Performance awards	33,695	87,122	161,561	3,047		1,291		4,172

Unit awards	—	—	—	4,645		—		22,941
Total	2,705,203	2,441,003	1,456,296	$	20,579	$	12,185	$	38,035

Restricted Units

Our restricted unit awards are considered phantom units, as they represent the right to receive our common units upon vesting. We account for restricted units as either equity-classified awards or liability-classified awards, depending on expected method of settlement. Awards we settle with the issuance of common units upon vesting are equity-classified. Awards we settle in cash upon vesting are liability-classified. We record compensation expense ratably over the vesting period based on the fair value of the common units at the grant date (for domestic employees and NEDs) or the fair value of the common units measured at each reporting period (for international employees). DERs paid with respect to outstanding equity-classified unvested restricted units reduce equity, similar to cash distributions to unitholders, whereas DERs paid with respect to outstanding liability-classified unvested restricted units are expensed. In connection with the DERs for equity awards, we paid $2.4 million, $2.1 million and $2.7 million respectively, in cash, for the years ended December 31, 2021, 2020 and 2019.

Domestic Employees. The outstanding restricted units granted to domestic employees are equity-classified awards and generally vest over five years, beginning one year after the grant date. The fair value of these awards is measured at the grant date.

Non-Employee Directors. The outstanding restricted units granted to NEDs are equity-classified awards that vest over three years. On January 1, 2019 we adopted amended guidance that allows for the fair value of these awards to be measured at the grant date. The unvested restricted units granted to NEDs as of January 1, 2019 were measured at the fair value as of that date. Previously, the fair value of these awards was equal to the market price of our common units at each reporting period.

International Employees. The outstanding restricted units granted to international employees are cash-settled and accounted for as liability-classified awards. These awards vest over three years and the fair value is equal to the market price of our common units at each reporting period. For the year ended December 31, 2021, we granted 10,396 restricted units and 8,344 restricted units vested.

A summary of our equity-classified restricted unit awards is as follows:


	Measured at Grant Date Fair Value
	Number of Units	Weighted-Average Fair Value Per Unit
Nonvested units as of January 1, 2019 (a)	1,088,236	$	29.00

Granted	596,881	26.46
Vested	(328,386)	30.11
Forfeited	(72,239)	28.05
Nonvested units as of December 31, 2019	1,284,492	27.48
Granted	1,454,998	12.10
Vested	(374,847)	28.47
Forfeited	(30,749)	26.75
Nonvested units as of December 31, 2020	2,333,894	17.70
Granted	1,049,081	16.28
Vested	(630,888)	20.07
Forfeited	(102,339)	14.28
Nonvested units as of December 31, 2021	2,649,748	16.57

(a) Upon adoption of amended guidance, nonvested units include 59,752 units issued to NEDs which were measured at a fair value per unit of $20.93.

The total fair value of our equity-classified restricted unit awards vested for the years ended December 31, 2021, 2020 and 2019 was $10.3 million, $4.6 million and $9.3 million, respectively. We issued 460,076, 275,146 and 242,199 common units in connection with these award vestings, net of employee tax withholding requirements, for the years ended December 31, 2021, 2020 and 2019, respectively. Unrecognized compensation cost related to our equity-classified employee awards totaled $42.0 million as of December 31, 2021, which we expect to recognize over a weighted-average period of 3.7 years.

Performance Awards

Performance awards are issued to certain of our key employees and represent either rights to receive our common units or cash upon achieving performance measures for the performance period established by the NuStar GP, LLC Compensation Committee. Achievement of the performance measures determines the rate at which the performance awards convert into our common units or cash, which ranges from zero to 200% for certain awards.

Performance awards vest in three annual increments (tranches), based upon our achievement of the performance measures set by the Compensation Committee during the performance periods that end on December 31 of each applicable year. Therefore, the performance awards are not considered granted for accounting purposes until the Compensation Committee has set the performance measures for each tranche of awards. Performance unit awards are equity-classified awards measured at the grant date fair value. In addition, since the performance unit awards granted do not receive DERs, the grant date fair value of these awards is reduced by the per unit distributions expected to be paid to common unitholders during the vesting period. Performance cash awards are accounted for as a liability but may be settled in common units. We record compensation expense ratably for each vesting tranche over its requisite service period (one year) if it is probable that the specified performance measures will be achieved. Additionally, changes in the actual or estimated outcomes that affect the quantity of performance awards expected to be converted into common units or paid in cash, are recognized as a cumulative adjustment. Performance units vested relate to the performance for the performance period ended December 31 of the previous year.

A summary of our performance awards is shown below:


			Performance Unit Awards
				Granted for Accounting Purposes
	Performance Cash Awards		Total Performance Unit Awards Granted	Performance Unit Awards	Weighted-Average Grant Date Fair Value per Unit
	(Thousands of Dollars)
Outstanding as of January 1, 2019	$	—	158,326	80,690	$	23.43
Granted	—		95,969	74,439	28.01
Vested	—		(80,690)	(80,690)	23.43
Forfeitures	—		(12,044)	—	—
Outstanding as of December 31, 2019	—		161,561	74,439	28.01
Granted	2,167		—	57,448	13.21
Performance adjustment (a)	—		72,951	72,951	28.01
Vested	—		(147,390)	(147,390)	28.01

Outstanding as of December 31, 2020	2,167		87,122	57,448	13.21
Granted	2,254		4,021	33,695	15.79

Vested (b)	(672)		(53,427)	(53,427)	13.21
Forfeitures	(51)		(4,021)	(4,021)	13.21
Outstanding as of December 31, 2021	$	3,698	33,695	33,695	15.79

(a) For the year ended December 31, 2020, common units granted and issued upon vesting of performance units earned at 198% of the 2019 target.

(b) For the year ended December 31, 2021, we settled performance cash awards in common units and issued 26,704 common units, net of employee tax withholding requirements.

The total fair value of our performance unit awards vested for the years ended December 31, 2021, 2020 and 2019 was $0.8 million, $4.2 million and $2.1 million, respectively. For the years ended December 31, 2021, 2020, and 2019 we issued 31,366, 93,440 and 50,054 common units in connection with the performance unit award vestings, net of employee tax withholding requirements, respectively.

On January 27, 2022, we settled performance cash awards in common units, and together with the performance unit awards, we issued 114,618 common units, net of employee tax withholding requirements, respectively.

Unit Awards

Unit awards are equity-classified awards of fully vested common units. We accrued compensation expense in 2021 and 2019 that was paid in unit awards in the first quarters of the respective subsequent years. We base the number of unit awards granted on the fair value of the common units at the grant date. A summary of our unit awards is shown below:


Date of Grant	Grant Date Fair Value		Unit Awards Granted	Common Units Issued, Net of Employee Withholding Tax
	(Thousands of Dollars)
February 2022	$	4,645	280,685	186,190
February and March 2020	$	22,941	834,224	571,735

INCOME TAXES

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

INCOME TAXES

Components of income tax expense related to certain of our continuing operations conducted through separate taxable wholly owned corporate subsidiaries were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Current:
U.S.	$	3,755	$	36	$	3,741
Foreign	221		2,415		1,489
Foreign withholding tax	1,281		—		101
Total current	5,257		2,451		5,331

Deferred:
U.S.	(93)		300		(490)
Foreign	(531)		(621)		(168)
Foreign withholding tax	(745)		533		182
Total deferred	(1,369)		212		(476)

Less: amounts reported in discontinued operations	—		—		101

Income tax expense	$	3,888	$	2,663	$	4,754

The difference between income tax expense recorded in our consolidated statements of income (loss) and income taxes computed by applying the applicable statutory federal income tax rate to income before income tax expense is due to the fact that the majority of our income is not subject to federal income tax due to our status as a limited partnership. We record a tax provision related to the amount of undistributed earnings of our foreign subsidiaries expected to be repatriated.

The tax effects of significant temporary differences representing deferred income tax assets and liabilities were as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Deferred income tax assets:
Net operating losses	$	20,005	$	18,459
Employee benefits	83		134
Environmental and legal reserves	47		105

Capital loss	3,735		10,813
Other	495		834
Total deferred income tax assets	24,365		30,345
Less: Valuation allowance	(23,718)		(28,211)
Net deferred income tax assets	647		2,134

Deferred income tax liabilities:
Property, plant and equipment	(11,884)		(13,772)
Foreign withholding tax	(272)		(1,002)
Other	(322)		(371)
Total deferred income tax liabilities	(12,478)		(15,145)

Net deferred income tax liability	$	(11,831)	$	(13,011)

As of December 31, 2021, our U.S. and foreign corporate operations have net operating loss carryforwards for tax purposes totaling $63.4 million and $6.9 million, respectively, which are subject to various limitations on use and expire in years 2025 through 2034 for U.S. losses and in years 2021 through 2031 for foreign losses. However, U.S. losses generated after December 31, 2017, totaling $9.4 million, can be carried forward indefinitely. As of December 31, 2021, our U.S. corporate operations have a capital loss carryforward for tax purposes totaling $17.7 million, which is subject to limitations on use and expires in 2024. The capital loss carryforward decreased $33.8 million for the year ended December 31, 2021 due to changes in our estimates of loss carryforwards following the Texas City Sale.

As of December 31, 2021 and 2020, we have a valuation allowance of $23.7 million and $28.2 million, respectively, related to our deferred tax assets on net operating losses and capital losses. We estimate the amount of valuation allowance based upon our expectations of taxable income in the various jurisdictions in which we operate and the period over which we can utilize those future deductions. The valuation allowance reflects uncertainties related to our ability to utilize certain net operating loss carryforwards before they expire. In 2021, there was a $4.9 million decrease in the valuation allowance for the U.S. net operating loss and a $0.4 million increase in the foreign net operating loss valuation allowance due to changes in our estimates of the amount of loss carryforwards that will be realized, based upon future taxable income.

The realization of net deferred income tax assets recorded as of December 31, 2021 is dependent upon our ability to generate future taxable income in the United States. We believe it is more likely than not that the net deferred income tax assets as of December 31, 2021 will be realized, based on expected future taxable income.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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+ Details

SEGMENT INFORMATION

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

SEGMENT INFORMATION

Our reportable business segments consist of the pipeline, storage and fuels marketing segments. Our segments represent strategic business units that offer different services and products. We evaluate the performance of each segment based on its respective operating income, before general and administrative expenses and certain non-segmental depreciation and amortization expense. General and administrative expenses are not allocated to the operating segments since those expenses relate primarily to the overall management at the entity level. We are primarily engaged in the transportation, terminalling and storage of petroleum products and renewable fuels and the transportation of anhydrous ammonia. We also market petroleum products.

Results of operations for the reportable segments were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Revenues:
Pipeline	$	762,238	$	718,823	$	701,830




Storage	427,668		494,442		454,001

Fuels marketing	428,608		268,345		342,215
Consolidation and intersegment eliminations	(14)		(46)		(25)
Total revenues	$	1,618,500	$	1,481,564	$	1,498,021

Depreciation and amortization expense:
Pipeline	$	179,088	$	177,384	$	166,991
Storage	87,500		99,092		97,573

Total segment depreciation and amortization expense	266,588		276,476		264,564
Other depreciation and amortization expense	7,792		8,625		8,360
Total depreciation and amortization expense	$	274,380	$	285,101	$	272,924

Operating income:
Pipeline	$	321,472	$	118,429	$	332,480
Storage	24,800		189,781		154,105
Fuels marketing	11,181		12,233		20,578
Consolidation and intersegment eliminations	—		—		(32)
Total segment operating income	357,453		320,443		507,131
General and administrative expenses	113,207		102,716		107,855
Other depreciation and amortization expense	7,792		8,625		8,360


Total operating income	$	236,454	$	209,102	$	390,916

Revenues by geographic area are shown in the table below:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
United States	$	1,582,672	$	1,441,892	$	1,465,135
Foreign	35,828		39,672		32,886
Consolidated revenues	$	1,618,500	$	1,481,564	$	1,498,021

For the years ended December 31, 2021, 2020 and 2019, Valero Energy Corporation accounted for approximately 19%, or $308.5 million, 20%, or $295.1 million, and 21%, or $307.2 million, of our revenues, respectively. These revenues were included in all of our reportable business segments. No other single customer accounted for 10% or more of our consolidated revenues.

Total amounts of property, plant and equipment, net by geographic area were as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
United States	$	3,428,441	$	3,837,550
Foreign	113,201		119,962
Consolidated property, plant and equipment, net	$	3,541,642	$	3,957,512

Total assets by reportable segment were as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Pipeline	$	3,441,272	$	3,609,508
Storage	1,537,037		1,897,167
Fuels marketing	41,562		31,967
Total segment assets	5,019,871		5,538,642

Other partnership assets	136,461		278,376
Total consolidated assets	$	5,156,332	$	5,817,018

Capital expenditures by reportable segment were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Pipeline	$	67,340	$	122,512	$	387,702
Storage	112,043		71,788		141,972

Other partnership assets	1,750		3,779		3,894
Total capital expenditures	$	181,133	$	198,079	$	533,568

Capital expenditures have not been adjusted to separately disclose those capital expenditures related to discontinued operations, which are included in the storage segment totaling $28.0 million for the year ended December 31, 2019.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

SUBSEQUENT EVENT	12 Months Ended
SUBSEQUENT EVENT	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENTOn February 11, 2022, we entered into an agreement to sell the equity interests in our wholly owned subsidiaries that own our Point Tupper terminal facility to EverWind Fuels for $60.0 million. During February 2022, sale negotiations with the potential buyer progressed significantly and management with appropriate authority agreed to the sale. The terminal facility has a storage capacity of 7.8 million barrels and is included in the storage segment. We expect to complete the sale in the first half of 2022 and utilize the sales proceeds to improve our debt metrics. The book value at closing is expected to exceed the agreed purchase price and result in an estimated non-cash loss in the range of $40.0 million to $50.0 million, primarily due to foreign currency translation losses accumulated since the acquisition of the Point Tupper facility in 2005.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2021
Accounting Policies [Abstract]
Consolidation	Consolidation The accompanying consolidated financial statements represent the consolidated operations of the Partnership and our subsidiaries. Inter-partnership balances and transactions have been eliminated in consolidation. The operations of certain pipelines and terminals in which we own an undivided interest are proportionately consolidated in the accompanying consolidated financial statements.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. On an ongoing basis, management reviews its estimates based on currently available information. Management may revise estimates due to changes in facts and circumstances.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash equivalents are all highly liquid investments with an original maturity of three months or less when acquired.
Accounts Receivable	Accounts Receivable Trade receivables are carried at amortized cost, net of a valuation allowance for current expected credit losses. We extend credit to certain customers after review of various credit indicators, including the customer’s credit rating, and obtain letters of credit, guarantees or collateral as deemed necessary. We monitor our ongoing credit exposure through active review of customer balances against contract terms and due dates and pool customer receivables based upon days outstanding, which is our primary credit risk indicator. Our review activities include timely account reconciliations, dispute resolution and payment confirmations.
Inventories	Inventories Inventories consist of petroleum products, materials and supplies. Inventories are valued at the lower of cost or net realizable value. Cost is determined using the weighted-average cost method. Our inventory, other than materials and supplies, consists of one end-product category, petroleum products, which we include in the fuels marketing segment. Accordingly, we determine lower of cost or net realizable value adjustments on an aggregate basis. Materials and supplies are valued at the lower of average cost or net realizable value.
Restricted Cash	Restricted Cash As of December 31, 2021 and 2020, we have restricted cash representing legally restricted funds that are unavailable for general use totaling $8.8 million, which is included in “Other long-term assets, net” on the consolidated balance sheet.
Property, Plant and Equipment	Property, Plant and Equipment We record additions to property, plant and equipment, including reliability and strategic capital expenditures, at cost. Repair and maintenance costs associated with existing assets that are minor in nature and do not extend the useful life of existing assets are charged to operating expenses as incurred. Depreciation of property, plant and equipment is recorded on a straight-line basis over the estimated useful lives of the related assets. When property or equipment is retired, sold or otherwise disposed of, the difference between the carrying value and the net proceeds is recognized in “Other income (expense), net” or “Loss from discontinued operations, net of tax” in the consolidated statements of income (loss) in the year of disposition. We capitalize overhead costs and interest costs incurred on funds used to construct property, plant and equipment while the asset is under construction. The overhead costs and capitalized interest are recorded as part of the asset to which they relate and are amortized over the asset’s estimated useful life as a component of depreciation expense.
Leases - Lessee	Leases - Lessee We lease assets used in our operations, including land, docks, and marine vessels. We record all leases on our consolidated balance sheet except for those leases with an initial term of 12 months or less, which are expensed on a straight-line basis over the lease term. We use judgment in determining the reasonably certain lease term and consider factors such as the nature and utility of the leased asset, as well as the importance of the leased asset to our operations. We calculate the present value of our lease liabilities based upon our incremental borrowing rate unless the rate implicit in the lease is readily determinable. For all of our asset classes except the other pipeline and terminal equipment asset class, we combine lease and non-lease components and account for them as a single lease component. Certain of our leases are subject to variable payment arrangements, the most notable of which include: •dockage and wharfage charges, which are based on volumes moved over leased docks and are included in our calculation of our lease payments based on minimum throughput volume requirements. We recognize charges on excess throughput volumes in profit or loss in the period in which the obligation for those payments is incurred; and •consumer price index adjustments, which are measured and included in the calculation of our lease payments based on the consumer price index at the commencement date. We recognize changes in lease payments as a result of changes in the consumer price index in profit or loss in the period in which those payments are made. See Note 15 for further discussion of our lessee arrangements.
Goodwill	Goodwill We assess goodwill for impairment annually on October 1, or more frequently if events or changes in circumstances indicate it might be impaired. We have the option to first assess qualitative factors to determine whether it is necessary to perform a quantitative goodwill impairment test. We elected to bypass the qualitative assessment for all reporting units as of October 1, 2021 and October 1, 2020 and performed quantitative assessments, resulting in the determination that goodwill was not impaired. We measure goodwill impairment as the excess of each reporting unit’s carrying value over its fair value, not to exceed the carrying amount of goodwill for that reporting unit. The carrying value of each reporting unit equals the total identified assets (including goodwill) less the sum of each reporting unit’s identified liabilities. We used reasonable and supportable methods to assign the assets and liabilities to the appropriate reporting units in a consistent manner. As of December 31, 2021 and 2020, our reporting units to which goodwill has been allocated consisted of the following: •crude oil pipelines; •refined product pipelines; and •terminals, excluding our Point Tupper facility and our refinery crude storage tanks. Please see Notes 4 and 10 for a discussion of the balances of and changes in the carrying amount of goodwill. We recognize an impairment of goodwill if the carrying value of a reporting unit that contains goodwill exceeds its estimated fair value. In order to estimate the fair value of the reporting unit, including goodwill, management must make certain estimates and assumptions that affect the total fair value of the reporting unit including, among other things, an assessment of market conditions, projected cash flows, discount rates and growth rates. Management’s estimates of projected cash flows related to the reporting unit include, but are not limited to, future earnings of the reporting unit, assumptions about the use or disposition of the asset, estimated remaining life of the asset, and future expenditures necessary to maintain the asset’s existing service potential. We calculate the estimated fair value of each of our reporting units using a weighted-average of values calculated using an income approach and a market approach. The income approach involves estimating the fair value of each reporting unit by discounting its estimated future cash flows using a discount rate that would be consistent with a market participant’s assumption. The market approach bases the fair value measurement on information obtained from observed stock prices of public companies and recent merger and acquisition transaction data of comparable entities. Management’s estimates are based on numerous assumptions about future operations and market conditions, which we believe to be reasonable but are inherently uncertain. The uncertainties underlying our assumptions and estimates could differ significantly from actual results, including with respect to the duration and severity of the COVID-19 pandemic, which could lead to a different determination of the fair value of our assets. We will continue to monitor the business and consider additional interim analysis of goodwill as appropriate.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets We review long-lived assets, including property, plant and equipment, for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. We evaluate recoverability using undiscounted estimated net cash flows generated by the related asset or asset group. If the results of that evaluation indicate that the undiscounted cash flows are less than the carrying amount of the asset (i.e., the asset is not recoverable) we perform an impairment analysis. If our intent is to hold the asset for continued use, we determine the amount of impairment as the amount by which the net carrying value exceeds its fair value. If our intent is to sell the asset, and the criteria required to classify an asset as held for sale are met, we determine the amount of impairment as the amount by which the net carrying amount exceeds its fair value less costs to sell. See Note 4 for a discussion of our long-lived asset impairment charges. We believe that the carrying amounts of our long-lived assets as of December 31, 2021 are recoverable.
Income Taxes	Income Taxes We are a limited partnership and generally are not subject to federal or state income taxes. Accordingly, our taxable income or loss, which may vary substantially from income or loss reported for financial reporting purposes, is generally included in the federal and state income tax returns of our partners. For transfers of publicly held common units subsequent to our initial public offering, we have made an election permitted by Section 754 of the Internal Revenue Code (the Code) to adjust the common unit purchaser’s tax basis in our underlying assets to reflect the purchase price of the units. This results in an allocation of taxable income and expenses to the purchaser of the common units, including depreciation deductions and gains and losses on sales of assets, based upon the new unitholder’s purchase price for the common units. We conduct certain of our operations through taxable wholly owned corporate subsidiaries. We account for income taxes related to our taxable subsidiaries using the asset and liability method. Under this method, we recognize deferred tax assets and liabilities for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. We measure deferred taxes using enacted tax rates expected to apply to taxable income in the year those temporary differences are expected to be recovered or settled. We recognize a tax position if it is more likely than not that the tax position will be sustained, based on the technical merits of the position, upon examination. We record uncertain tax positions in the financial statements at the largest amount of benefit that is more likely than not to be realized. We had no unrecognized tax benefits as of December 31, 2021 and 2020. NuStar Energy and certain of its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. For U.S. federal and state purposes, as well as for our major non-U.S. jurisdictions, tax years subject to examination are 2016 through 2020, according to standard statute of limitations.
Asset Retirement Obligations	Asset Retirement Obligations We record a liability for asset retirement obligations at the fair value of the estimated costs to retire a tangible long-lived asset at the time we incur that liability, which is generally when the asset is purchased, constructed or leased, when we have a legal obligation to incur costs to retire the asset and when a reasonable estimate of the fair value of the obligation can be made. If a reasonable estimate cannot be made at the time the liability is incurred, we record the liability when sufficient information is available to estimate the fair value. We have asset retirement obligations with respect to certain of our assets due to various legal obligations to clean and/or dispose of those assets at the time they are retired. However, these assets can be used for an extended and indeterminate period of time as long as they are properly maintained and/or upgraded. It is our practice and current intent to maintain our assets and continue making improvements to those assets based on technological advances. As a result, we believe that our assets have indeterminate lives for purposes of estimating asset retirement obligations because dates or ranges of dates upon which we would retire these assets cannot reasonably be estimated at this time. When a date or range of dates can reasonably be estimated for the retirement of any asset, we estimate the costs of performing the retirement activities and record a liability for the fair value of these costs. We also have legal obligations in the form of leases and right-of-way agreements, which require us to remove certain of our assets upon termination of the agreement. However, these lease or right-of-way agreements generally contain automatic renewal provisions that extend our rights indefinitely or we have other legal means available to extend our rights. Liabilities for conditional asset retirement obligations related to the retirement of terminal assets with lease and right-of-way agreements were not material as of December 31, 2021 and 2020.
Environmental Remediation Costs	Environmental Remediation Costs Environmental remediation costs are expensed and an associated accrual established when site restoration and environmental remediation and cleanup obligations are either known or considered probable and can be reasonably estimated. These environmental obligations are based on estimates of probable undiscounted future costs using currently available technology and applying current regulations, as well as our own internal environmental policies. The environmental liabilities have not been reduced by possible recoveries from third parties. Environmental costs include initial site surveys, costs for remediation and restoration and ongoing monitoring costs, as well as fines, damages and other costs, when applicable and estimable. Adjustments to initial estimates are recorded, from time to time, to reflect changing circumstances and estimates based upon additional information developed in subsequent periods.
Revenue Recognition	Revenue Recognition Revenue-Generating Activities. Revenues for the pipeline segment are derived from interstate and intrastate pipeline transportation of refined products, crude oil and anhydrous ammonia and the applicable pipeline tariff on a per barrel basis for crude oil or refined products and on a per ton basis for ammonia. Revenues generated from product sales in the pipeline segment relate to surplus pipeline loss allowance volumes. Revenues for the storage segment include fees for tank storage agreements, under which a customer agrees to pay for a certain amount of storage in a tank over a period of time (storage terminal revenues), and throughput agreements, under which a customer pays a fee per barrel for volumes moving through our terminals (throughput terminal revenues). Our terminals also provide blending, additive injections, handling and filtering services for which we charge additional fees. Certain of our facilities charge fees to provide marine services such as pilotage, tug assistance, line handling, launch service, emergency response services and other ship services (all of which are considered optional services). We are considered to be the lessor in certain revenue contracts. To the extent that a contract contains both lease and non-lease components, such as when we provide both storage capacity and optional services to a customers, we combine the lease and non-lease components and account for the transaction based on the predominant component. Revenues for the fuels marketing segment are derived from the sale of petroleum products. Within our pipeline and storage segments, we provide services on uninterruptible and interruptible bases. Uninterruptible services within our pipeline segment typically result from contracts that contain take-or-pay minimum volume commitments (MVCs) from the customer. Contracts with MVCs obligate the customer to pay for that minimum amount. If a customer fails to meet its MVC for the applicable service period, the customer is obligated to pay a deficiency fee based upon the shortfall between the actual volumes transported or stored and the MVC for that service period (deficiency payments). In exchange, those contracts with MVCs obligate us to stand ready to transport volumes up to the customer’s MVC. Within our storage segment, uninterruptible services arise from contracts containing a fixed monthly fee for the portion of storage capacity reserved by the customer. These contracts require that the customer pay the fixed monthly fee, regardless of whether or not it uses our storage facility (i.e., take-or-pay obligation), and that we stand ready to store that volume. Interruptible services within our pipeline and storage segments are generally provided when and to the extent we determine the requested capacity is available. The customer typically pays a per-unit rate for the actual quantities of services it receives. For the majority of our contracts, we recognize revenue in the amount to which we have a right to invoice. Generally, payment terms do not exceed 30 days. Performance Obligations. The majority of our contracts contain a single performance obligation. For our pipeline segment, the single performance obligation encompasses multiple activities necessary to deliver our customers’ products to their destinations. Typically, we satisfy this performance obligation over time as the product volume is delivered in or out of the pipelines. Certain of our pipeline segment customer contracts include an incentive pricing structure, which provides a discounted rate for the remainder of the contract once the customer exceeds a cumulative volume. The ability to receive discounted future services represents a material right to the customer, which results in a second performance obligation in those contracts. The performance obligation for our storage segment consists of multiple activities necessary to receive, store and deliver our customers’ products. We typically satisfy this performance obligation over time as the product volume is delivered in or out of the tanks (for throughput terminal revenues) or with the passage of time (for storage terminal revenues). Product sales contracts generally include a single performance obligation to deliver specified volumes of a commodity, which we satisfy at a point in time, when the product is delivered and the customer obtains control of the commodity. Optional services described in our contracts do not provide a material right to the customer, and are not considered a separate performance obligation in the contract. If and when a customer elects an optional service, and the terms of the contract are otherwise met, those services become part of the existing performance obligation. Transaction Price. For uninterruptible services, we determine the transaction price at contract inception based on the guaranteed minimum amount of revenue over the term of the contract. For interruptible services and optional services, we determine the transaction price based on our right to invoice the customer for the value of services provided to the customer for the applicable period. In certain instances, our customers reimburse us for capital projects, in arrangements referred to as contributions in aid of construction, or CIAC. Typically, in these instances, we receive upfront payments for future services, which are included in the transaction price of the underlying service contract. We collect taxes on certain revenue transactions to be remitted to governmental authorities, which may include sales, use, value-added and some excise taxes. These taxes are not included in the transaction price and are, therefore, excluded from revenues. Allocation of Transaction Price. We allocate the transaction price to the single performance obligation that exists in the vast majority of our contracts with customers. For the few contracts that have a second performance obligation, such as those that include an incentive pricing structure, we calculate an average rate based on the estimated total volumes to be delivered over the term of the contract and the resulting estimated total revenue to be billed using the applicable rates in the contract. We allocate the transaction price to the two performance obligations by applying the average rate to product volumes as they are delivered to the customer over the term of the contract. Determining the timing and amount of volumes subject to these incentive pricing contracts requires judgment that can impact the amount of revenue allocated to the two separate performance obligations. We base our estimates on our analysis of expected future production information available from our customers or other sources, which we update at least quarterly. Some of our MVC contracts include provisions that allow the customer to apply deficiency payments to future service periods (the carryforward period). In those instances, we have not satisfied our performance obligation as we still have the obligation to perform those services, subject to contractual and/or capacity constraints, at the customer’s request. At least quarterly, we assess the customer’s ability to utilize any deficiency payments during the carryforward period. If we receive a deficiency payment from a customer that we expect the customer to utilize during the carryforward period, we defer that amount as a contract liability. We will consider the performance obligation satisfied and allocate any deferred deficiency payments to our performance obligation when the customer utilizes the deficiency payment, the carryforward period ends or we determine the customer cannot or will not utilize the deficiency payment (i.e. breakage). If our contract does not allow the customer to apply deficiency payments to future service periods, we allocate the deficiency payment to the already satisfied portion of the performance obligation.
Income Allocation	Income Allocation Our partnership agreement contains provisions for the allocation of net income to the unitholders. Our net income for each quarterly reporting period is first allocated to the preferred limited partner unitholders in an amount equal to the earned distributions for the respective reporting period. We allocate the remaining net income or loss among the common unitholders.
Basic and Diluted Net Income (Loss) per Common Unit	Basic and Diluted Net Income (Loss) Per Common Unit Basic and diluted net income (loss) per common unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partners and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include restricted units awarded under our long-term incentive plans. We compute basic net income (loss) per common unit by dividing net income (loss) attributable to our common limited partners by the weighted-average number of common units outstanding during the period. We compute diluted net income (loss) per common unit by dividing net income (loss) attributable to our common limited partners by the sum of (i) the weighted-average number of common units outstanding during the period and (ii) the effect of dilutive potential common units outstanding during the period. Dilutive potential common units include contingently issuable performance units awarded and the Series D Preferred Units. See Note 22 for additional information on our performance units, Note 17 for additional information on our Series D Preferred Units and Note 19 for the calculation of basic and diluted net income (loss) per common unit.
Derivative Financial Instruments	Derivative Financial Instruments When we apply hedge accounting, we formally document all relationships between hedging instruments and hedged items. This process includes identification of the hedging instrument and the hedged transaction, the nature of the risk being hedged and how the hedging instrument’s effectiveness will be assessed. To qualify for hedge accounting, at inception of the hedge we assess whether the derivative instruments that are used in our hedging transactions are expected to be highly effective in offsetting changes in cash flows. Throughout the designated hedge period and at least quarterly, we assess whether the derivative instruments are highly effective and continue to qualify for hedge accounting. We enter into the forward-starting swaps in order to hedge the risk of changes in the interest payments attributable to changes in the benchmark interest rate during the period from the effective date of the swap to the issuance of the forecasted debt. For forward-starting interest rate swaps designated and qualifying as cash flow hedges, we recognize the fair value of each interest rate swap in the consolidated balance sheets. We record changes in the fair value of the hedge as a component of accumulated other comprehensive income (loss) (AOCI), to the extent those cash flow hedges remain highly effective. If at any point a cash flow hedge ceases to qualify for hedge accounting, changes in the fair value of the hedge are recognized in “Interest expense, net” from that date forward. The amount accumulated in AOCI is amortized into “Interest expense, net” as the forecasted interest payments occur or if the interest payments are probable not to occur. We classify cash flows associated with our derivative instruments as operating cash flows in the consolidated statements of cash flows, except for receipts or payments associated with terminated forward-starting interest rate swap agreements, which are included in cash flows from financing activities. See Note 16 for additional information regarding our derivative financial instruments.
Unit-based Compensation	Unit-based CompensationUnit-based compensation for our long-term incentive plans is recorded in our consolidated balance sheets based on the fair value of the awards granted and recognized as compensation expense primarily on a straight-line basis over the requisite service period. Forfeitures of our unit-based compensation awards are recognized as an adjustment to compensation expense when they occur. Unit-based compensation expense is included in “General and administrative expenses” on our consolidated statements of income (loss). Most of our currently outstanding awards are classified as equity awards as we intend to settle these awards through the issuance of our common units. See Note 22 for additional information regarding our unit-based compensation.
Foreign Currency Translation	Foreign Currency Translation The functional currencies of our foreign subsidiaries are the local currencies of the countries in which the subsidiaries are located. The assets and liabilities of our foreign subsidiaries with local functional currencies are translated to U.S. dollars at period-end exchange rates, and income and expense items are translated to U.S. dollars at weighted-average exchange rates in effect during the period. These translation adjustments are included in “Accumulated other comprehensive loss” in the equity section of the consolidated balance sheets. Gains and losses on foreign currency transactions are included in “Other income (expense), net” in the consolidated statements of income (loss).
Reclassifications	Reclassifications We have reclassified certain previously reported amounts in the consolidated financial statements and notes to conform to current-period presentation.

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS (Tables)

12 Months Ended

Dec. 31, 2021

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations, Supplemental Income Statement Disclosures [Table Text Block]

The following is a reconciliation of the major classes of line items included in “Loss from discontinued operations, net of tax” on the consolidated statements of income (loss):


	Year Ended December 31, 2019
	(Thousands of Dollars)



Revenues	$	248,981
Costs and expenses:





Cost of revenues	220,595
Impairment losses	336,838
General and administrative expenses (excluding depreciation and amortization expense)	1,231

Total costs and expenses	558,664
Operating loss	(309,683)
Interest income, net	32
Other expense, net	(2,775)
Loss from discontinued operations before income tax expense	(312,426)
Income tax expense	101
Loss from discontinued operations, net of tax	$	(312,527)

Discontinued Operations, Selected Cash Flow Information [Table Text Block]

The following table presents selected cash flow information associated with our discontinued operations:


	Year Ended December 31, 2019
	(Thousands of Dollars)
Capital expenditures	$	(27,954)

Significant noncash operating activities and other adjustments:
Depreciation and amortization expense	$	8,536
Asset impairment losses	$	305,715
Goodwill impairment loss	$	31,123
Loss from sale of the St. Eustatius Operations	$	3,942

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

The following table provides information about contract assets and contract liabilities from contracts with customers:


	2021				2020				2019
	Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,694	$	(22,019)	$	2,140	$	(21,083)	$	2,066	$	(21,579)
Noncurrent portion	932		(47,537)		1,003		(40,289)		539		(38,945)
Held for sale	—		—		—		—		—		(25,357)
Total	3,626		(69,556)		3,143		(61,372)		2,605		(85,881)

Activity:
Additions	3,888		(41,121)		5,686		(69,830)		4,890		(52,957)
Transfer to accounts receivable	(3,977)		—		(4,828)		—		(4,352)		—
Transfer to revenues, including amounts reported in discontinued operations	(697)		49,207		(375)		61,646		—		77,466

Total	(786)		8,086		483		(8,184)		538		24,509

Balances as of December 31:
Current portion	2,336		(15,443)		2,694		(22,019)		2,140		(21,083)
Noncurrent portion	504		(46,027)		932		(47,537)		1,003		(40,289)

Total	$	2,840	$	(61,470)	$	3,626	$	(69,556)	$	3,143	$	(61,372)

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]


2022	$	413,612
2023	277,278
2024	187,995
2025	131,877
2026	89,103
Thereafter	92,064
Total	$	1,191,929

Disaggregation of Revenue [Table Text Block]

The following table disaggregates our revenues:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	331,485	$	329,105	$	316,417
Refined products and ammonia pipelines (excluding lessor revenues)	430,753		387,793		376,588
Total pipeline segment revenues from contracts with customers	762,238		716,898		693,005
Lessor revenues	—		1,925		8,825
Total pipeline segment revenues	762,238		718,823		701,830

Storage segment:
Throughput terminals	122,331		136,632		114,243
Storage terminals (excluding lessor revenues)	263,883		316,496		298,984
Total storage segment revenues from contracts with customers	386,214		453,128		413,227
Lessor revenues	41,454		41,314		40,774
Total storage segment revenues	427,668		494,442		454,001

Fuels marketing segment:
Revenues from contracts with customers	428,608		268,345		342,215

Consolidation and intersegment eliminations	(14)		(46)		(25)

Total revenues	$	1,618,500	$	1,481,564	$	1,498,021

ALLOWANCE FOR CREDIT LOSSES (Tables)

12 Months Ended

Dec. 31, 2021

Allowance for Credit Loss [Abstract]

Allowance for Credit Losses [Table Text Block]

The balance of and changes in the allowance for credit losses consisted of the following:


	Year Ended December 31,
	2020		2019
	(Thousands of Dollars)
Balance as of beginning of year	$	72	$	9,412
Current period provision for credit losses	441		2,322
Write-offs charged against the allowance	(513)		(11,662)


Balance as of end of year	$	—	$	72

Activity for the year ended December 31, 2021 was immaterial and the balance as of December 31, 2021 was $0.

INVENTORIES (Tables)

12 Months Ended

Dec. 31, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory Table [Text Block]

Inventories consisted of the following:


	December 31,
	2021		2020
	(Thousands of Dollars)
Petroleum products	$	12,456	$	7,394
Materials and supplies	4,188		3,665
Total	$	16,644	$	11,059

PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Property, plant and equipment consisted of the following:


	Estimated Useful Lives			December 31,
				2021		2020
	(Years)			(Thousands of Dollars)
Land, buildings and improvements	0	-	40	$	366,525	$	440,358
Pipelines, storage and terminals	15	-	40	4,897,041		5,253,507
Rights-of-way	20	-	40	353,262		359,441
Construction in progress				112,020		111,436
Total				5,728,848		6,164,742
Less accumulated depreciation and amortization				(2,187,206)		(2,207,230)
Property, plant and equipment, net				$	3,541,642	$	3,957,512

INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2021

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]

Intangible assets consisted of the following:


	Weighted-Average Amortization Period	December 31, 2021				December 31, 2020
		Cost		Accumulated Amortization		Cost		Accumulated Amortization
	(Years)	(Thousands of Dollars)
Customer contracts and relationships	17	$	793,900	$	(237,579)	$	863,900	$	(235,205)
Other	47	2,359		(895)		2,359		(845)
Total		$	796,259	$	(238,474)	$	866,259	$	(236,050)

GOODWILL (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

The balances of and changes in the carrying amount of goodwill by segment were as follows:


	Pipeline		Storage		Total
	(Thousands of Dollars)
Balances as of January 1, 2020	$	704,231	$	301,622	$	1,005,853

Activity for the year ended December 31, 2020:
Goodwill impairment loss on crude oil pipelines	(225,000)		—		(225,000)
Texas City Sale	—		(14,437)		(14,437)

Balances as of December 31, 2020:
Goodwill	704,231		287,185		991,416
Accumulated impairment loss	(225,000)		—		(225,000)
Net goodwill	479,231		287,185		766,416

Activity for the year ended December 31, 2021:
Goodwill impairment loss on Eastern U.S. Terminal Operations	—		(34,060)		(34,060)

Balances as of December 31, 2021:
Goodwill	704,231		253,125		957,356
Accumulated impairment loss	(225,000)		—		(225,000)
Net goodwill	$	479,231	$	253,125	$	732,356

ACCRUED LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2021

Accrued Liabilities, Current [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued liabilities consisted of the following:


	December 31,
	2021		2020
	(Thousands of Dollars)
Employee wages and benefit costs	$	40,209	$	27,805
Revenue contract liabilities	15,443		22,019

Operating lease liabilities	10,346		10,890

Environmental costs	3,378		5,371

Other	10,442		11,685
Accrued liabilities	$	79,818	$	77,770

DEBT (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt consisted of the following:


				December 31,
	Maturity			2021		2020
				(Thousands of Dollars)
Revolving Credit Agreement	April 27, 2025 (a)			$	110,500	$	—
6.75% senior notes	February 1, 2021			—		300,000
4.75% senior notes	February 1, 2022			—		250,000
5.75% senior notes	October 1, 2025			600,000		600,000
6.00% senior notes	June 1, 2026			500,000		500,000
5.625% senior notes	April 28, 2027			550,000		550,000
6.375% senior notes	October 1, 2030			600,000		600,000
Subordinated Notes	January 15, 2043			402,500		402,500
GoZone Bonds	2038	thru	2041	322,140		322,140
Receivables Financing Agreement	January 31, 2025 (a)			83,800		57,000
Net fair value adjustments, unamortized discounts and unamortized debt issuance costs		N/A		(38,315)		(42,382)
Total long-term debt (excluding finance leases)				3,130,625		3,539,258
Finance leases (refer to Note 15)				52,930		54,238

Long-term debt, less current portion				$	3,183,555	$	3,593,496

Schedule of Maturities of Long-term Debt [Table Text Block]

The long-term debt repayments (excluding finance leases) as of December 31, 2021 are due as follows (in thousands of dollars):


2022	$	—
2023 (a)	194,300
2024	—
2025	600,000
2026	500,000
Thereafter	1,874,640
Total repayments	3,168,940
Net fair value adjustments, unamortized discounts and unamortized debt issuance costs	(38,315)
Total long-term debt (excluding finance leases)	$	3,130,625

Schedule of GoZone Bonds [Table Text Block]

The following table summarizes the GoZone Bonds outstanding as of December 31, 2021:

Series

Date Issued

Amount
Outstanding

Interest Rate

Mandatory
Purchase Date

Maturity Date

(Thousands of Dollars)

Series 2008

June 26, 2008

55,440

6.10

June 1, 2030

June 1, 2038

Series 2010

July 15, 2010

100,000

6.35

n/a

July 1, 2040

Series 2010A

October 7, 2010

43,300

6.35

n/a

October 1, 2040

Series 2010B

December 29, 2010

48,400

6.10

June 1, 2030

December 1, 2040

Series 2011

August 9, 2011

75,000

5.85

June 1, 2025

August 1, 2041

Total

322,140

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

HEALTH, SAFETY AND ENVIRONMENTAL MATTERS (Tables)

12 Months Ended

Dec. 31, 2021

Environmental Remediation Obligations [Abstract]

Schedule of Environmental Accrual Rollforward [Table Text Block]

The balance of and changes in the accruals for environmental matters were as follows:


	Year Ended December 31,
	2021		2020
	(Thousands of Dollars)
Balance as of the beginning of year	$	8,373	$	7,938
Additions to accrual	2,044		3,692
Payments	(2,669)		(3,257)

Balance as of the end of year	$	7,748	$	8,373

Environmental Accruals By Balance Sheet Location [Table Text Block]

Accruals for environmental matters are included in the consolidated balance sheets as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Accrued liabilities	$	3,378	$	5,371
Other long-term liabilities	4,370		3,002
Accruals for environmental matters	$	7,748	$	8,373

COMMITMENTS, CONTINGENCIES AND UNCERTAINTIES (Tables)

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Payments for Operating Leases and Purchase Obligations [Table Text Block]

Future minimum rental payments applicable to all noncancellable purchase obligations as of December 31, 2021 are as follows:


	Payments Due by Period
	2022		2023		2024		2025		2026		Thereafter		Total
	(Thousands of Dollars)
Purchase obligations	$	10,606	$	5,125	$	2,226	$	1,552	$	753	$	5,466	$	25,728

LEASE ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Schedule of Right-of-Use Assets and Lease Liabilities

Right-of-use assets and lease liabilities included in our consolidated balance sheet were as follows:


		December 31,
	Balance Sheet Location	2021		2020
		(Thousands of Dollars)
Right-of-Use Assets:
Operating	Other long-term assets, net	$	76,867	$	87,443
Finance	Property, plant and equipment, net of accumulated amortization of $13,561 and $8,444	$	71,002	$	73,319

Lease Liabilities:
Operating:
Current	Accrued liabilities	$	10,346	$	10,890
Noncurrent	Other long-term liabilities	65,060		74,899
Total operating lease liabilities		$	75,406	$	85,789
Finance:
Current	Current portion of finance lease obligations	$	3,848	$	3,839
Noncurrent	Long-term debt, less current portion	52,930		54,238
Total finance lease liabilities		$	56,778	$	58,077

Maturity Analysis of Lease Liabilities

As of December 31, 2021, maturities of our operating and finance lease liabilities were as follows:


	Operating Leases		Finance Leases
	(Thousands of Dollars)
2022	$	12,252	$	5,831
2023	10,960		5,705
2024	10,656		5,217
2025	8,705		4,424
2026	5,876		3,979
Thereafter	48,542		52,399
Total lease payments	$	96,991	$	77,555
Less: Interest	21,585		20,777
Present value of lease liabilities	$	75,406	$	56,778

Lease Cost

Costs incurred for leases, including costs associated with discontinued operations, were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Operating lease cost	$	15,323	$	16,814	$	29,167
Finance lease cost:
Amortization of right-of-use assets	$	5,251	$	4,700	$	3,748
Interest expense on lease liability	$	2,081	$	2,201	$	2,212
Short-term lease cost	$	14,198	$	15,359	$	19,140
Variable lease cost	$	4,939	$	8,653	$	6,990
Total lease cost	$	41,792	$	47,727	$	61,257

Additional Lease Information

The table below presents additional information regarding our leases.


	2021						2020						2019
	Operating Leases			Finance Leases			Operating Leases			Finance Leases			Operating Leases			Finance Leases
	(Thousands of Dollars, Except Term and Rate Data)
For the year ended December 31:
Cash outflows from operating activities	$	12,829		$	2,090		$	14,487		$	2,208		$	27,567		$	2,027
Cash outflows from financing activities	$	—		$	4,244		$	—		$	4,981		$	—		$	3,700
Right-of-use assets obtained in exchange for lease liabilities	$	3,278		$	3,173		$	20,830		$	3,077		$	2,153		$	4,430
As of December 31:
Weighted-average remaining lease term (in years)	13			18			13			19			15			20
Weighted-average discount rate	3.2		%	3.6		%	3.2		%	3.7		%	3.6		%	3.7		%

Assets Leased to Others


	Estimated Useful Life	December 31,
		2021		2020
	(Years)	(Thousands of Dollars)
Lease storage assets, at cost	30	$	246,841	$	241,664
Less accumulated depreciation		(139,200)		(130,217)
Lease storage assets, net		$	107,641	$	111,447

DERIVATIVES AND FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Unwound Interest Rate Swap Agreements [Table Text Block]


		December 31,
Unwound Interest Rate Swap Agreements	Balance Sheet Location	2021		2020
		(Thousands of Dollars)

Fixed-to-floating	Long-term debt, less current portion	$	—	$	1,363
Forward-starting	Accumulated other comprehensive loss	$	(36,486)	$	(42,150)

Derivative Instruments, Gain (Loss) [Table Text Block]

Our forward-starting interest rate swaps had the following impact on earnings:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Change in unrealized loss on cash flow hedges	$	—	$	(30,291)	$	(19,045)
Reclassification of loss on cash flow hedges to interest expense, net	$	5,664	$	4,265	$	3,814

Fair Value and Carrying Value of Debt [Table Text Block]

The estimated fair values and carrying amounts of the long-term debt, excluding finance leases, were as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Fair value	$	3,459,153	$	3,799,378
Carrying amount	$	3,130,625	$	3,539,258

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS (Tables)

12 Months Ended

Dec. 31, 2021

Temporary Equity Disclosure [Abstract]

Schedule of Series D Preferred Units [Table Text Block]

The following is a summary of our Series D Preferred Units issued and outstanding as of December 31, 2021:


	Original Issuance Date	Number of Units Issued and Outstanding	Purchase Price per Unit
Initial Closing	June 29, 2018	15,760,441	$	25.38
Second Closing	July 13, 2018	7,486,209	$	25.38
Total		23,246,650

PARTNERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2021

Distribution Made to Limited Partner [Line Items]

Schedule of Preferred Units [Table Text Block]


Units	Original Issuance Date	Number of Units Issued and Outstanding	Price per Unit		Fixed Distribution Rate per Annum (as a Percentage of the $25.00 Liquidation Preference per Unit)		Fixed Distribution Rate per Unit per Annum		Fixed Distribution per Annum (in thousands of dollars)		Optional Redemption Date/Date at Which Distribution Rate Becomes Floating	Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit)
Series A Preferred Units	November 25, 2016	9,060,000	$	25.00	8.50	%	$	2.125	$	19,252	December 15, 2021	Three-month LIBOR plus 6.766%
Series B Preferred Units	April 28, 2017	15,400,000	$	25.00	7.625	%	$	1.90625	$	29,357	June 15, 2022	Three-month LIBOR plus 5.643%
Series C Preferred Units	November 30, 2017	6,900,000	$	25.00	9.00	%	$	2.25	$	15,525	December 15, 2022	Three-month LIBOR plus 6.88%

The Series A Preferred Units switched from a fixed distribution rate to a floating rate on December 15, 2021, with the floating rate set forth below for the period indicated:


Period	Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)

December 15, 2021 - March 14, 2022	$	0.43606	$	3,951

Schedule of Common Units [Table Text Block]

The following table shows the balance of and changes in the number of our common units outstanding:


	Year Ended December 31,
	2021	2020	2019
Balance as of the beginning of year	109,468,127	108,527,806	107,225,156
Issuance of units	—	—	527,426
Unit-based compensation (refer to Note 22 for discussion)	518,146	940,321	775,224
Balance as of the end of year	109,986,273	109,468,127	108,527,806

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The balance of and changes in the components included in AOCI were as follows:


	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of January 1, 2019	$	(47,299)	$	(893)	$	(6,686)	$	(54,878)
Other comprehensive income (loss) before reclassification adjustments	3,527		(19,045)		1,000		(14,518)
Net gain on pension costs reclassified into other income, net	—		—		(2,314)		(2,314)
Net loss on cash flow hedges reclassified into interest expense, net	—		3,814		—		3,814

Other comprehensive income (loss)	3,527		(15,231)		(1,314)		(13,018)
Balance as of December 31, 2019	(43,772)		(16,124)		(8,000)		(67,896)
Other comprehensive income (loss) before reclassification adjustments	1,410		(30,291)		(2,924)		(31,805)
Net gain on pension costs reclassified into other income, net	—		—		(1,220)		(1,220)
Net loss on cash flow hedges reclassified into interest expense, net	—		4,265		—		4,265

Other comprehensive income (loss)	1,410		(26,026)		(4,144)		(28,760)
Balance as of December 31, 2020	(42,362)		(42,150)		(12,144)		(96,656)
Other comprehensive income before reclassification adjustments	601		—		17,721		18,322
Net gain on pension costs reclassified into other income, net	—		—		(1,308)		(1,308)
Net loss on cash flow hedges reclassified into interest expense, net	—		5,664		—		5,664

Other comprehensive income	601		5,664		16,413		22,678
Balance as of December 31, 2021	$	(41,761)	$	(36,486)	$	4,269	$	(73,978)

Common Limited Partner [Member]

Distribution Made to Limited Partner [Line Items]

Distributions Made to Limited Partner, by Distribution [Table Text Block]

The following table summarizes information about cash distributions to our common limited partners applicable to the period in which the distributions were earned:


	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
Quarter ended:
December 31, 2021	$	0.40	$	44,008	February 8, 2022	February 14, 2022
September 30, 2021	0.40		43,814		November 8, 2021	November 12, 2021
June 30, 2021	0.40		43,814		August 6, 2021	August 12, 2021
March 31, 2021	0.40		43,834		May 10, 2021	May 14, 2021
Year ended December 31, 2021	$	1.60	$	175,470

Year ended December 31, 2020	$	1.60	$	174,873
Year ended December 31, 2019	$	2.40	$	259,136

NET INCOME (LOSS) PER COMMON UNIT (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Net Income (Loss) Per Unit [Text Block]

The following table details the calculation of net income (loss) per common unit:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income (loss)	$	38,225	$	(198,983)	$	(105,693)
Distributions to preferred limited partners	(127,399)		(124,882)		(121,693)
Distributions to common limited partners	(175,470)		(174,873)		(259,136)
Distribution equivalent rights to restricted units	(2,396)		(2,093)		(2,659)
Distributions in excess of income (loss)	$	(267,040)	$	(500,831)	$	(489,181)

Distributions to common limited partners	$	175,470	$	174,873	$	259,136
Allocation of distributions in excess of income (loss)	(267,040)		(500,831)		(489,181)
Series D Preferred Unit accretion (refer to Note 17)	(16,903)		(17,626)		(18,085)
Net loss attributable to common units	$	(108,473)	$	(343,584)	$	(248,130)

Basic weighted-average common units outstanding	109,585,635		109,155,117		107,789,030

Diluted common units outstanding:
Basic weighted-average common units outstanding	109,585,635		109,155,117		107,789,030
Effect of dilutive potential common units	—		—		65,669
Diluted weighted-average common units outstanding	109,585,635		109,155,117		107,854,699

Basic and diluted net loss per common unit	$	(0.99)	$	(3.15)	$	(2.30)

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

12 Months Ended

Dec. 31, 2021

Supplemental Cash Flow Information [Abstract]

Schedule of Changes in Current Assets and Liabilities [Table Text Block]

Changes in current assets and current liabilities were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	(2,105)	$	14,589	$	(23,480)

Inventories	(5,585)		1,340		(866)

Prepaid and other current assets	(1,710)		(3,326)		(5,103)
Increase (decrease) in current liabilities:
Accounts payable	10,202		(25,455)		8,068

Accrued interest payable	(16,708)		12,922		1,632
Accrued liabilities	4,448		7,886		(19,740)
Taxes other than income tax	(2,689)		3,972		(5,276)

Changes in current assets and current liabilities	$	(14,147)	$	11,928	$	(44,765)

Schedule of Supplemental Cash Flow Information [Table Text Block]

Cash flows related to interest and income taxes were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	218,181	$	204,511	$	176,859
Cash paid for income taxes, net of tax refunds received	$	5,491	$	3,260	$	6,817

Schedule of Cash and Cash Equivalents [Table Text Block]


	December 31,
	2021		2020
	(Thousands of Dollars)
Cash and cash equivalents	$	5,637	$	153,625
Other long-term assets, net	8,802		8,801
Cash, cash equivalents and restricted cash	$	14,439	$	162,426

EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2021

Retirement Benefits [Abstract]

Disclosures for our Pension Plans and other postretirement benefit plans


	Pension Plans				Other Postretirement Benefit Plans
	2021		2020		2021		2020
	(Thousands of Dollars)
Change in benefit obligation:
Benefit obligation, January 1	$	186,685	$	167,257	$	14,680	$	13,196
Service cost	9,978		9,174		593		529
Interest cost	4,084		4,693		326		399
Benefits paid (a)	(19,366)		(9,520)		(257)		(281)
Participant contributions	—		—		44		44
Actuarial (gain) loss	(694)		15,081		884		793
Other	(780)		—		—		—
Benefit obligation, December 31	$	179,907	$	186,685	$	16,270	$	14,680
Change in plan assets:
Plan assets at fair value, January 1	$	182,727	$	159,036	$	—	$	—
Actual return on plan assets	26,425		21,758		—		—
Employer contributions	52		11,453		213		237
Benefits paid (a)	(19,366)		(9,520)		(257)		(281)
Participant contributions	—		—		44		44
Plan assets at fair value, December 31	$	189,838	$	182,727	$	—	$	—
Reconciliation of funded status:
Fair value of plan assets at December 31	$	189,838	$	182,727	$	—	$	—
Less: Benefit obligation at December 31	179,907		186,685		16,270		14,680
Funded status at December 31	$	9,931	$	(3,958)	$	(16,270)	$	(14,680)
Amounts recognized in the consolidated balance sheets (b):
Other long-term assets, net	$	14,945	$	—	$	—	$	—
Accrued liabilities	(467)		(382)		(442)		(352)
Other long-term liabilities	(4,547)		(3,576)		(15,828)		(14,328)
Net pension asset (liability)	$	9,931	$	(3,958)	$	(16,270)	$	(14,680)

Accumulated benefit obligation	$	171,899	$	181,263	$	16,270	$	14,680

The components of net periodic benefit cost (income)

The components of net periodic benefit cost (income) related to our Pension Plans and other postretirement benefit plans were as follows:


	Pension Plans						Other Postretirement Benefit Plans
	Year Ended December 31,						Year Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of Dollars)
Service cost	$	9,978	$	9,174	$	9,549	$	593	$	529	$	431
Interest cost	4,084		4,693		5,480		326		399		453
Expected return on plan assets	(9,233)		(8,972)		(8,015)		—		—		—
Amortization of prior service credit	(2,057)		(2,057)		(2,057)		(1,145)		(1,145)		(1,145)
Amortization of net actuarial loss	2,279		1,845		846		176		137		42
Other	(561)		136		—		—		—		—
Net periodic benefit cost (income)	$	4,490	$	4,819	$	5,803	$	(50)	$	(80)	$	(219)

Adjustments recognized in other comprehensive (loss) income

Adjustments to other comprehensive income (loss) related to our Pension Plans and other postretirement benefit plans were as follows:


	Pension Plans						Other Postretirement Benefit Plans
	Year Ended December 31,						Year Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of Dollars)
Net unrecognized gain (loss) arising during the year:
Net actuarial gain (loss)	$	18,666	$	(2,159)	$	2,545	$	(884)	$	(793)	$	(1,559)

Net (gain) loss reclassified into income:
Amortization of prior service credit	(2,057)		(2,057)		(2,057)		(1,145)		(1,145)		(1,145)
Amortization of net actuarial loss	2,279		1,845		846		176		137		42
Other	(561)		—		—		—		—		—
Net gain reclassified into income	(339)		(212)		(1,211)		(969)		(1,008)		(1,103)

Income tax (expense) benefit	(61)		28		14		—		—		—
Total changes to other comprehensive income (loss)	$	18,266	$	(2,343)	$	1,348	$	(1,853)	$	(1,801)	$	(2,662)

The amounts recorded as a component of accumulated other comprehensive (loss) income


	Pension Plans				Other Postretirement Benefit Plans
	December 31,				December 31,
	2021		2020		2021		2020
	(Thousands of Dollars)
Unrecognized actuarial loss	$	(3,748)	$	(24,878)	$	(4,554)	$	(3,846)
Prior service credit	7,630		10,433		4,884		6,029
Deferred tax asset	57		118		—		—
Accumulated other comprehensive income (loss), net of tax	$	3,939	$	(14,327)	$	330	$	2,183

Schedule of fair value of plan assets

The major classes of plan assets measured at fair value for the Pension Plan were as follows:


	December 31, 2021
	Level 1		Level 2		Level 3		Total
	(Thousands of Dollars)
Cash equivalent securities	$	710	$	—	$	—	$	710
Equity securities:
U.S. large cap equity fund (a)	—		110,672		—		110,672
International stock index fund (b)	17,708		—		—		17,708
Fixed income securities:
Bond market index fund (c)	60,748		—		—		60,748
Total	$	79,166	$	110,672	$	—	$	189,838


	December 31, 2020
	Level 1		Level 2		Level 3		Total
	(Thousands of Dollars)
Cash equivalent securities	$	2,125	$	—	$	—	$	2,125
Equity securities:
U.S. large cap equity fund (a)	—		104,857		—		104,857
International stock index fund (b)	20,732		—		—		20,732
Fixed income securities:
Bond market index fund (c)	55,013		—		—		55,013
Total	$	77,870	$	104,857	$	—	$	182,727

(b)This fund tracks the performance of the Total International Composite Index.

(c)This fund tracks the performance of the Barclays Capital U.S. Aggregate Bond Index.

Schedule of expected benefit payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid for the years ending December 31:


	Pension Plans		Other Postretirement Benefit Plans
	(Thousands of Dollars)
2022	$	10,652	$	442
2023	$	11,232	$	497
2024	$	11,212	$	531
2025	$	12,266	$	582
2026	$	12,109	$	640
2027-2031	$	65,477	$	4,003

Assumptions used to determine the benefit obligations

The weighted-average assumptions used to determine the benefit obligations were as follows:


	Pension Plans				Other Postretirement Benefit Plans
	December 31,				December 31,
	2021		2020		2021		2020
Discount rate	3.10	%	2.84	%	3.08	%	2.83	%
Rate of compensation increase	3.99	%	3.51	%	n/a		n/a
Cash balance interest crediting rate	2.00	%	2.00	%	n/a		n/a

Assumptions used to determine the net periodic benefit cost (income)

The weighted-average assumptions used to determine the net periodic benefit cost (income) were as follows:


	Pension Plans						Other Postretirement Benefit Plans
	Year Ended December 31,						Year Ended December 31,
	2021		2020		2019		2021		2020		2019
Discount rate	2.84	%	3.34	%	4.40	%	2.83	%	3.43	%	4.53	%
Expected long-term rate of return on plan assets	6.00	%	6.50	%	6.50	%	n/a		n/a		n/a
Rate of compensation increase	3.51	%	3.51	%	3.51	%	n/a		n/a		n/a
Cash balance interest crediting rate	2.00	%	2.00	%	2.90	%	n/a		n/a		n/a

Schedule of assumed health care cost trend rates

The assumed health care cost trend rates were as follows:


	December 31,
	2021		2020
Health care cost trend rate assumed for next year	6.84	%	6.84	%
Rate to which the cost trend rate was assumed to decrease (the ultimate trend rate)	5.00	%	5.00	%
Year that the rate reaches the ultimate trend rate	2028		2028

UNIT-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of long-term incentive plan compensation expense

The following table summarizes information pertaining to all of our long-term incentive plans:


	Units Outstanding December 31,			Compensation Expense Year Ended December 31,
	2021	2020	2019	2021		2020		2019
				(Thousands of Dollars)
Restricted units:
Domestic employees	2,520,436	2,235,125	1,223,143	$	11,892	$	10,205	$	9,437
Non-employee directors (NEDs)	129,312	98,769	61,349	856		631		774
International employees	21,760	19,987	10,243	139		58		711
Performance awards	33,695	87,122	161,561	3,047		1,291		4,172

Unit awards	—	—	—	4,645		—		22,941
Total	2,705,203	2,441,003	1,456,296	$	20,579	$	12,185	$	38,035

Restricted unit award activity

A summary of our equity-classified restricted unit awards is as follows:


	Measured at Grant Date Fair Value
	Number of Units	Weighted-Average Fair Value Per Unit
Nonvested units as of January 1, 2019 (a)	1,088,236	$	29.00

Granted	596,881	26.46
Vested	(328,386)	30.11
Forfeited	(72,239)	28.05
Nonvested units as of December 31, 2019	1,284,492	27.48
Granted	1,454,998	12.10
Vested	(374,847)	28.47
Forfeited	(30,749)	26.75
Nonvested units as of December 31, 2020	2,333,894	17.70
Granted	1,049,081	16.28
Vested	(630,888)	20.07
Forfeited	(102,339)	14.28
Nonvested units as of December 31, 2021	2,649,748	16.57

(a) Upon adoption of amended guidance, nonvested units include 59,752 units issued to NEDs which were measured at a fair value per unit of $20.93.

Performance Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of long-term incentive plan compensation expense

A summary of our performance awards is shown below:


			Performance Unit Awards
				Granted for Accounting Purposes
	Performance Cash Awards		Total Performance Unit Awards Granted	Performance Unit Awards	Weighted-Average Grant Date Fair Value per Unit
	(Thousands of Dollars)
Outstanding as of January 1, 2019	$	—	158,326	80,690	$	23.43
Granted	—		95,969	74,439	28.01
Vested	—		(80,690)	(80,690)	23.43
Forfeitures	—		(12,044)	—	—
Outstanding as of December 31, 2019	—		161,561	74,439	28.01
Granted	2,167		—	57,448	13.21
Performance adjustment (a)	—		72,951	72,951	28.01
Vested	—		(147,390)	(147,390)	28.01

Outstanding as of December 31, 2020	2,167		87,122	57,448	13.21
Granted	2,254		4,021	33,695	15.79

Vested (b)	(672)		(53,427)	(53,427)	13.21
Forfeitures	(51)		(4,021)	(4,021)	13.21
Outstanding as of December 31, 2021	$	3,698	33,695	33,695	15.79

(a) For the year ended December 31, 2020, common units granted and issued upon vesting of performance units earned at 198% of the 2019 target.

(b) For the year ended December 31, 2021, we settled performance cash awards in common units and issued 26,704 common units, net of employee tax withholding requirements.

Share-based Payment Arrangement [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of long-term incentive plan compensation expense

A summary of our unit awards is shown below:


Date of Grant	Grant Date Fair Value		Unit Awards Granted	Common Units Issued, Net of Employee Withholding Tax
	(Thousands of Dollars)
February 2022	$	4,645	280,685	186,190
February and March 2020	$	22,941	834,224	571,735

INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Components of income tax expense related to certain of our continuing operations conducted through separate taxable wholly owned corporate subsidiaries were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Current:
U.S.	$	3,755	$	36	$	3,741
Foreign	221		2,415		1,489
Foreign withholding tax	1,281		—		101
Total current	5,257		2,451		5,331

Deferred:
U.S.	(93)		300		(490)
Foreign	(531)		(621)		(168)
Foreign withholding tax	(745)		533		182
Total deferred	(1,369)		212		(476)

Less: amounts reported in discontinued operations	—		—		101

Income tax expense	$	3,888	$	2,663	$	4,754

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The tax effects of significant temporary differences representing deferred income tax assets and liabilities were as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Deferred income tax assets:
Net operating losses	$	20,005	$	18,459
Employee benefits	83		134
Environmental and legal reserves	47		105

Capital loss	3,735		10,813
Other	495		834
Total deferred income tax assets	24,365		30,345
Less: Valuation allowance	(23,718)		(28,211)
Net deferred income tax assets	647		2,134

Deferred income tax liabilities:
Property, plant and equipment	(11,884)		(13,772)
Foreign withholding tax	(272)		(1,002)
Other	(322)		(371)
Total deferred income tax liabilities	(12,478)		(15,145)

Net deferred income tax liability	$	(11,831)	$	(13,011)

SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Results of operations for the reportable segments were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Revenues:
Pipeline	$	762,238	$	718,823	$	701,830




Storage	427,668		494,442		454,001

Fuels marketing	428,608		268,345		342,215
Consolidation and intersegment eliminations	(14)		(46)		(25)
Total revenues	$	1,618,500	$	1,481,564	$	1,498,021

Depreciation and amortization expense:
Pipeline	$	179,088	$	177,384	$	166,991
Storage	87,500		99,092		97,573

Total segment depreciation and amortization expense	266,588		276,476		264,564
Other depreciation and amortization expense	7,792		8,625		8,360
Total depreciation and amortization expense	$	274,380	$	285,101	$	272,924

Operating income:
Pipeline	$	321,472	$	118,429	$	332,480
Storage	24,800		189,781		154,105
Fuels marketing	11,181		12,233		20,578
Consolidation and intersegment eliminations	—		—		(32)
Total segment operating income	357,453		320,443		507,131
General and administrative expenses	113,207		102,716		107,855
Other depreciation and amortization expense	7,792		8,625		8,360


Total operating income	$	236,454	$	209,102	$	390,916

Schedule of Revenue from External Customers by Geographic Areas [Table Text Block]

Revenues by geographic area are shown in the table below:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
United States	$	1,582,672	$	1,441,892	$	1,465,135
Foreign	35,828		39,672		32,886
Consolidated revenues	$	1,618,500	$	1,481,564	$	1,498,021

Schedule of Long-lived Assets by Geographic Areas [Table Text Block]

Total amounts of property, plant and equipment, net by geographic area were as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
United States	$	3,428,441	$	3,837,550
Foreign	113,201		119,962
Consolidated property, plant and equipment, net	$	3,541,642	$	3,957,512

Schedule of Segment Reporting Information Assets By Segment [Table Text Block]

Total assets by reportable segment were as follows:


	December 31,
	2021		2020
	(Thousands of Dollars)
Pipeline	$	3,441,272	$	3,609,508
Storage	1,537,037		1,897,167
Fuels marketing	41,562		31,967
Total segment assets	5,019,871		5,538,642

Other partnership assets	136,461		278,376
Total consolidated assets	$	5,156,332	$	5,817,018

Schedule of Capital Expenditures, by Segment [Table Text Block]

Capital expenditures by reportable segment were as follows:


	Year Ended December 31,
	2021		2020		2019
	(Thousands of Dollars)
Pipeline	$	67,340	$	122,512	$	387,702
Storage	112,043		71,788		141,972

Other partnership assets	1,750		3,779		3,894
Total capital expenditures	$	181,133	$	198,079	$	533,568

ORGANIZATION AND OPERATIONS Narrative 1 - Operations (Details) bbl in Millions	12 Months Ended
	Dec. 31, 2021 mi bbl
Segment Information
Number of business segments	3
Pipeline Segment \| Central West Refined Products Pipelines
Segment Information
Pipeline length, in miles	3,205
Pipeline Segment \| Crude Oil Pipelines
Segment Information
Pipeline length, in miles	2,230
Storage capacity, in barrels \| bbl	5.6
Pipeline Segment \| East and North Pipelines
Segment Information
Pipeline length, in miles	2,500
Storage capacity, in barrels \| bbl	7.4
Pipeline Segment \| Ammonia Pipeline
Segment Information
Pipeline length, in miles	2,000
Storage Segment
Segment Information
Storage capacity, in barrels \| bbl	44.2

ORGANIZATION AND OPERATIONS Narrative 2 - Point Tupper Terminal Sale Agreement (Details) $ in Thousands, bbl in Millions	Feb. 11, 2022 USD ($) bbl	Dec. 07, 2020 USD ($)	Jul. 29, 2019 USD ($)	Oct. 08, 2021 bbl
Subsequent Event [Line Items]
Proceeds from expected sale of business \| $		$ 106,000	$ 230,000
Storage Segment
Subsequent Event [Line Items]
Storage capacity sold \| bbl				14.8
Forecast
Subsequent Event [Line Items]
Proceeds from expected sale of business \| $	$ 60,000
Forecast \| Storage Segment
Subsequent Event [Line Items]
Storage capacity sold \| bbl	7.8

ORGANIZATION AND OPERATIONS - Narrative 3 - Debt Amendments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 02, 2020	Dec. 31, 2019
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000.0		$ 1,200.0
Receivables Financing Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100.0	$ 125.0

ORGANIZATION AND OPERATIONS Narrative 4 - Eastern U.S. Terminals Disposition (Details) - USD ($) $ in Thousands						3 Months Ended	12 Months Ended
	Oct. 08, 2021	Oct. 01, 2021	Dec. 07, 2020	Oct. 01, 2020	Jul. 29, 2019	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Description of assets sold	nine U.S. terminal and storage facilities, including all our North East Terminals and one terminal in Florida		The two terminals had an aggregate storage capacity of 3.0 million barrels and were previously included in our storage segment.		The St. Eustatius Disposition included a 14.3 million barrel storage and terminalling facility and related assets on the island of St. Eustatius in the Caribbean Netherlands.
Proceeds from sale			$ 106,000		$ 230,000
Goodwill impairment loss		$ 0		$ 0		$ 34,100	$ 34,060	$ 225,000	$ 0
Level 2 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale	$ 250,000
Asset impairment losses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment losses						$ 95,700

ORGANIZATION AND OPERATIONS Narrative 5 - Houston Pipeline Impairment (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2021 USD ($)
Southern section of Houston Pipeline \| Asset impairment losses \| Pipeline Segment
Unusual or Infrequent Item, or Both [Line Items]
Long-lived asset impairment charge	$ 59,200

ORGANIZATION AND OPERATIONS Narrative 6 - Senior Notes 1 (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021	Dec. 31, 2020
4.75% senior notes
Debt Instrument [Line Items]
Long-term debt	$ 250,000		$ 250,000
Long-term debt, rate	4.75%
6.75% senior notes
Debt Instrument [Line Items]
Long-term debt		$ 300,000	$ 300,000
Long-term debt, rate		6.75%

ORGANIZATION AND OPERATIONS Narrative 7 - Selby Terminal Fire (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 15, 2019	Jan. 31, 2022	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unusual or Infrequent Item, or Both [Line Items]
Unusual or infrequent item, or both, nature of event or transaction	our terminal facility in Selby, California experienced a fire that destroyed two storage tanks and temporarily shut down the terminal
(Gain) loss, property damage			$ 5,400	$ (14,860)	$ 0	$ 0
Insurance proceeds				28,500	35,000
Subsequent Event [Member]
Unusual or Infrequent Item, or Both [Line Items]
Insurance proceeds		$ 5,800
Operating Expense [Member] \| Business Interruption Loss from Selby, California Fire [Member]
Unusual or Infrequent Item, or Both [Line Items]
Insurance proceeds				4,000	$ 6,700	$ 1,300
Other Income (Expense), Net
Unusual or Infrequent Item, or Both [Line Items]
(Gain) loss, property damage				$ (14,900)

ORGANIZATION AND OPERATIONS Narrative 8 - Texas City Sale (Details) $ in Thousands			12 Months Ended
	Dec. 07, 2020 USD ($)	Jul. 29, 2019 USD ($)	Dec. 31, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of terminals sold	2
Proceeds from sale	$ 106,000	$ 230,000
Loss on sale			$ (34,700)

ORGANIZATION AND OPERATIONS Narrative 9 - Senior Notes 2 (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 14, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2020
Debt Instrument [Line Items]
Proceeds from note offerings, net of issuance costs	$ 1,182,000	$ 0	$ 1,182,035	$ 491,580
5.75% senior notes
Debt Instrument [Line Items]
Long-term debt	$ 600,000	$ 600,000	600,000
Long-term debt, rate	5.75%	5.75%
6.375% senior notes
Debt Instrument [Line Items]
Long-term debt	$ 600,000	$ 600,000	$ 600,000
Long-term debt, rate	6.375%	6.375%
Logistics Notes due 2025 and Logistics Notes due 2030
Debt Instrument [Line Items]
Long-term debt, issuance costs	$ 18,000
4.80% senior notes
Debt Instrument [Line Items]
Long-term debt					$ 450,000
Long-term debt, rate					4.80%

ORGANIZATION AND OPERATIONS Narrative 10 - Term Loan (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 15, 2020	Apr. 21, 2020
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ (137,900)	$ 0	$ (141,746)	$ 0
Unsecured Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 750,000
Long-term debt, term						3 years
The Term Loan, Initial Loan					$ 500,000	$ 500,000

ORGANIZATION AND OPERATIONS Narrative 11 - Sale of St. Eustatius Operations (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 07, 2020	Jul. 29, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale	$ 106,000	$ 230,000
Asset and goodwill impairment losses			$ 188,968	$ 225,000	$ 336,838
Income (Loss) from Discontinued Operations, Net of Tax [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset and goodwill impairment losses					$ 336,800

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Narrative (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Oct. 01, 2021	Oct. 01, 2020	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unrecognized tax benefits				$ 0	$ 0
Tax years subject to examination				For U.S. federal and state purposes, as well as for our major non-U.S. jurisdictions, tax years subject to examination are 2016 through 2020, according to standard statute of limitations.
Payment terms				Generally, payment terms do not exceed 30 days.
Description of performance obligations				The majority of our contracts contain a single performance obligation. For our pipeline segment, the single performance obligation encompasses multiple activities necessary to deliver our customers’ products to their destinations. Typically, we satisfy this performance obligation over time as the product volume is delivered in or out of the pipelines. Certain of our pipeline segment customer contracts include an incentive pricing structure, which provides a discounted rate for the remainder of the contract once the customer exceeds a cumulative volume. The ability to receive discounted future services represents a material right to the customer, which results in a second performance obligation in those contracts.The performance obligation for our storage segment consists of multiple activities necessary to receive, store and deliver our customers’ products. We typically satisfy this performance obligation over time as the product volume is delivered in or out of the tanks (for throughput terminal revenues) or with the passage of time (for storage terminal revenues).Product sales contracts generally include a single performance obligation to deliver specified volumes of a commodity, which we satisfy at a point in time, when the product is delivered and the customer obtains control of the commodity.Optional services described in our contracts do not provide a material right to the customer, and are not considered a separate performance obligation in the contract. If and when a customer elects an optional service, and the terms of the contract are otherwise met, those services become part of the existing performance obligation.
Goodwill impairment loss	$ 0	$ 0	$ 34,100	$ 34,060	225,000	$ 0
Other long-term assets, net
Restricted cash				$ 8,800	$ 8,800

NEW ACCOUNTING PRONOUNCEMENTS Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 3,130,625	$ 3,539,258
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Total long-term debt	$ 600,000

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References + Details

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS Narrative 1 - Eastern U.S. Terminals Disposition (Details) $ in Thousands, bbl in Millions						3 Months Ended	12 Months Ended
	Oct. 08, 2021 USD ($) bbl	Oct. 01, 2021 USD ($)	Dec. 07, 2020 USD ($)	Oct. 01, 2020 USD ($)	Jul. 29, 2019 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 01, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale			$ 106,000		$ 230,000
Goodwill							$ 732,356	$ 766,416	$ 1,005,853
Goodwill impairment loss		$ 0		$ 0		$ 34,100	34,060	225,000	0
Storage Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Storage capacity sold \| bbl	14.8
Goodwill							253,125	287,185	$ 301,622
Goodwill impairment loss							$ 34,060	$ 0
Eastern Terminal Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill						0				$ 34,100
Level 2 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale	$ 250,000
Asset impairment losses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment losses						95,700
Asset impairment losses \| Intangible Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment losses						$ 23,900

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS Narrative 2 - Houston Pipeline Impairment (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2021 USD ($)
Southern section of Houston Pipeline \| Pipeline Segment
Segment Information
Property, plant and equipment, net	$ 0
Southern section of Houston Pipeline \| Pipeline Segment \| Asset impairment losses
Segment Information
Long-lived asset impairment charge	$ 59,200
Houston Pipeline
Segment Information
Number of distinct assets	2
Northern section of Houston Pipeline \| Pipeline Segment \| Asset impairment losses
Segment Information
Long-lived asset impairment charge	$ 0

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS - Narrative 3 - Sale of Texas City Terminals (Details) $ in Thousands				12 Months Ended
	Oct. 08, 2021	Dec. 07, 2020 USD ($)	Jul. 29, 2019 USD ($)	Dec. 31, 2020 USD ($)
Discontinued Operations and Disposal Groups [Abstract]
Number of terminals sold		2
Proceeds from sale		$ 106,000	$ 230,000
Description of assets sold	nine U.S. terminal and storage facilities, including all our North East Terminals and one terminal in Florida	The two terminals had an aggregate storage capacity of 3.0 million barrels and were previously included in our storage segment.	The St. Eustatius Disposition included a 14.3 million barrel storage and terminalling facility and related assets on the island of St. Eustatius in the Caribbean Netherlands.
Loss on sale				$ (34,700)

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS Narrative 4 - St. Eustatius (Details) - USD ($) $ in Thousands						3 Months Ended			12 Months Ended
	Oct. 08, 2021	Oct. 01, 2021	Dec. 07, 2020	Oct. 01, 2020	Jul. 29, 2019	Sep. 30, 2021	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment losses									$ 154,908	$ 0	$ 0
Goodwill impairment loss		$ 0		$ 0		$ 34,100			34,060	225,000	0
Goodwill									$ 732,356	$ 766,416	1,005,853
Proceeds from sale			$ 106,000		$ 230,000
Description of assets sold	nine U.S. terminal and storage facilities, including all our North East Terminals and one terminal in Florida		The two terminals had an aggregate storage capacity of 3.0 million barrels and were previously included in our storage segment.		The St. Eustatius Disposition included a 14.3 million barrel storage and terminalling facility and related assets on the island of St. Eustatius in the Caribbean Netherlands.
Income (Loss) from Discontinued Operations, Net of Tax [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment losses							$ 8,400	$ 297,300
Loss from sale of the St. Eustatius Operations											$ 3,900
St. Eustatius Bunkers [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill								0
St. Eustatius Bunkers [Member] \| Income (Loss) from Discontinued Operations, Net of Tax [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment loss								$ 31,100

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS Table 1 - Discontinued Operations Income Statement Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Revenues			$ 248,981
Cost of revenues			220,595
Impairment losses			336,838
General and administrative expenses (excluding depreciation and amortization expense)			1,231
Total costs and expenses			558,664
Operating loss			(309,683)
Interest income, net			32
Other expense, net			(2,775)
Loss from discontinued operations before income tax expense			(312,426)
Income tax expense	$ 0	$ 0	101
Loss from discontinued operations, net of tax	$ 0	$ 0	$ (312,527)

DISPOSITIONS, DISCONTINUED OPERATIONS AND IMPAIRMENTS Table 2 - Discontinued Operations Cash Flow Disclosures (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Oct. 01, 2021	Oct. 01, 2020	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment losses				$ 154,908	$ 0	$ 0
Goodwill impairment loss	$ 0	$ 0	$ 34,100	$ 34,060	$ 225,000	0
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures						(27,954)
Depreciation and amortization expense						8,536
Asset impairment losses						305,715
Goodwill impairment loss						31,123
Loss from sale of the St. Eustatius Operations						$ 3,942

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 1 - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Contract assets
Noncurrent portion	$ 504	$ 932	$ 1,003	$ 539
Total	2,840	3,626	3,143	2,605
Additions	3,888	5,686	4,890
Transfer to accounts receivable	(3,977)	(4,828)	(4,352)
Transfer to revenues, including amounts reported in discontinued operations, contract assets	(697)	(375)	0
Total activity	(786)	483	538
Contract liabilities
Current portion/Held for sale	(15,443)	(22,019)
Noncurrent portion	(46,027)	(47,537)	(40,289)	(38,945)
Total	(61,470)	(69,556)	(61,372)	(85,881)
Additions	(41,121)	(69,830)	(52,957)
Transfer to revenues, including amounts reported in discontinued operations, contract liabilities	49,207	61,646	77,466
Total activity	8,086	(8,184)	24,509
Other current assets
Contract assets
Current portion/Held for sale	2,336	2,694	2,140	2,066
Accrued liabilities
Contract liabilities
Current portion/Held for sale	$ (15,443)	(22,019)	(21,083)	(21,579)
Assets Held for Sale [Member]
Contract assets
Current portion/Held for sale		0	0	0
Liabilities held for sale [Member]
Contract liabilities
Current portion/Held for sale		$ 0	$ 0	$ (25,357)

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 2 - Expected Timing of Satisfaction of Performance Obligations (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 1,191,929
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 413,612
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 277,278
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 187,995
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 131,877
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 89,103
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 92,064
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 3 - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 1,618,500	$ 1,481,564	$ 1,498,021
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues	(14)	(46)	(25)
Pipeline Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customer	762,238	716,898	693,005
Lessor revenues	0	1,925	8,825
Revenues	762,238	718,823	701,830
Pipeline Segment \| Crude Oil Pipelines
Disaggregation of Revenue [Line Items]
Revenues from contracts with customer	331,485	329,105	316,417
Pipeline Segment \| Refined Products and Ammonia Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customer	430,753	387,793	376,588
Storage Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customer	386,214	453,128	413,227
Lessor revenues	41,454	41,314	40,774
Revenues	427,668	494,442	454,001
Storage Segment \| Throughput Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customer	122,331	136,632	114,243
Storage Segment \| Storage Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customer	263,883	316,496	298,984
Fuels Marketing Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customer	428,608	268,345	342,215
Revenues	$ 428,608	$ 268,345	$ 342,215

ALLOWANCE FOR CREDIT LOSSES Table - Balance of and Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Credit Loss [Abstract]
Balance as of beginning of year	$ 0	$ 72	$ 9,412
Current period provision for credit losses		441	2,322
Write-offs charged against the allowance		(513)	(11,662)
Balance as of end of year		$ 0	$ 72
Description, allowance for credit losses	Activity for the year ended December 31, 2021 was immaterial and the balance as of December 31, 2021 was $0.

INVENTORIES Table - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Petroleum products	$ 12,456	$ 7,394
Materials and supplies	4,188	3,665
Total	$ 16,644	$ 11,059

PROPERTY, PLANT AND EQUIPMENT Table - Property, Plant and Equipment, at Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 5,728,848	$ 6,164,742
Less accumulated depreciation and amortization	(2,187,206)	(2,207,230)
Property, plant and equipment, net	3,541,642	3,957,512
Land, Buildings and Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	366,525	440,358
Pipelines, storage and terminals
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	4,897,041	5,253,507
Rights-of-way
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	353,262	359,441
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 112,020	$ 111,436
Minimum [Member] \| Land, Buildings and Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	0 years
Minimum [Member] \| Pipelines, storage and terminals
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Minimum [Member] \| Rights-of-way
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Maximum [Member] \| Land, Buildings and Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Maximum [Member] \| Pipelines, storage and terminals
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Maximum [Member] \| Rights-of-way
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years

PROPERTY, PLANT AND EQUIPMENT Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Capitalized interest costs	$ 3.9	$ 4.9	$ 8.9
Depreciation and amortization expense for property, plant and equipment	$ 220.4	$ 228.8	$ 226.0

INTANGIBLE ASSETS Table - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Cost	$ 796,259	$ 866,259
Accumulated Amortization	$ (238,474)	(236,050)
Customer contracts and relationships
Intangible Assets [Line Items]
Weighted-average amortization period	17 years
Cost	$ 793,900	863,900
Accumulated Amortization	$ (237,579)	(235,205)
Other
Intangible Assets [Line Items]
Weighted-average amortization period	47 years
Cost	$ 2,359	2,359
Accumulated Amortization	$ (895)	$ (845)

INTANGIBLE ASSETS Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense	$ 48,500	$ 51,400	$ 51,400
2022	44,000
2023	38,000
2024	38,000
2025	38,000
2026	$ 38,000

GOODWILL Table - Balances of and Changes in the Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Thousands				3 Months Ended		12 Months Ended
	Oct. 01, 2021	Dec. 07, 2020	Oct. 01, 2020	Sep. 30, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill						$ 732,356	$ 766,416	$ 1,005,853
Goodwill impairment loss	$ 0		$ 0	$ (34,100)		(34,060)	(225,000)	0
Texas City Sale		$ (14,437)
Goodwill, gross						957,356	991,416
Goodwill, accumulated impairment loss						(225,000)	(225,000)
Pipeline Segment
Goodwill [Roll Forward]
Goodwill						479,231	479,231	704,231
Goodwill impairment loss						0
Goodwill, gross						704,231	704,231
Goodwill, accumulated impairment loss						(225,000)	(225,000)
Pipeline Segment \| Crude Oil Pipelines
Goodwill [Roll Forward]
Goodwill impairment loss					$ (225,000)		(225,000)
Texas City Sale		0
Storage Segment
Goodwill [Roll Forward]
Goodwill						253,125	287,185	$ 301,622
Goodwill impairment loss						(34,060)	0
Texas City Sale		$ (14,437)
Goodwill, gross						253,125	287,185
Goodwill, accumulated impairment loss						$ 0	$ 0

GOODWILL Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
GOODWILL Narrative (Details) - USD ($) $ in Thousands	Oct. 01, 2021	Oct. 01, 2020	Sep. 30, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0	$ 34,100		$ 34,060	$ 225,000	$ 0
Pipeline Segment
Goodwill [Line Items]
Goodwill impairment loss					$ 0
Crude Oil Pipelines \| Pipeline Segment
Goodwill [Line Items]
Goodwill impairment loss				$ 225,000		$ 225,000

ACCRUED LIABILITIES Table - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued Liabilities, Current [Abstract]
Employee wages and benefit costs	$ 40,209	$ 27,805
Revenue contract liabilities	15,443	22,019
Operating lease liabilities	10,346	10,890
Environmental costs	3,378	5,371
Other	10,442	11,685
Accrued liabilities	$ 79,818	$ 77,770

DEBT Narrative 1 - Short-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Finance lease liability, current	$ 3,848	$ 3,839

DEBT Table 1 - Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Oct. 31, 2021	Jan. 31, 2021	Dec. 31, 2020	Sep. 14, 2020	Dec. 31, 2019	May 22, 2019
Debt Instrument [Line Items]
Net fair value adjustments, unamortized discounts and unamortized debt issuance costs	$ (38,315)			$ (42,382)
Total long-term debt	3,130,625			3,539,258
Finance leases (refer to Note 15)	52,930			54,238
Long-term debt, less current portion	3,183,555			3,593,496
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term debt	110,500			0
6.75% senior notes
Debt Instrument [Line Items]
Long-term debt			$ 300,000	300,000
4.75% senior notes
Debt Instrument [Line Items]
Long-term debt		$ 250,000		250,000
5.75% senior notes
Debt Instrument [Line Items]
Long-term debt	600,000			600,000	$ 600,000
6.00% senior notes
Debt Instrument [Line Items]
Long-term debt	500,000			500,000			$ 500,000
5.625% senior notes
Debt Instrument [Line Items]
Long-term debt	550,000			550,000
6.375% senior notes
Debt Instrument [Line Items]
Long-term debt	600,000			600,000	$ 600,000
Subordinated Notes
Debt Instrument [Line Items]
Long-term debt	402,500			402,500
Gulf Opportunity Zone revenue bonds
Debt Instrument [Line Items]
Long-term debt	322,140			322,140		$ 365,400
Receivables Financing Agreement
Debt Instrument [Line Items]
Long-term debt	$ 83,800			$ 57,000

DEBT Table 2 - Long-Term Debt Repayments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	$ 0
2023	194,300
2024	0
2025	600,000
2026	500,000
Thereafter	1,874,640
Total repayments	3,168,940
Net fair value adjustments, unamortized discounts and unamortized debt issuance costs	(38,315)	$ (42,382)
Total long-term debt	$ 3,130,625	$ 3,539,258

DEBT Narrative 2 - Interest and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Interest payments	$ 220.0	$ 207.2	$ 183.8
Amortization of debt issuance costs and debt discount	$ 7.9	$ 11.4	$ 6.5

DEBT Narrative 3 - Revolving Credit Agreement (Details) - Revolving Credit Agreement [Member] - USD ($) $ in Thousands		12 Months Ended
	Jan. 28, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,000,000		$ 1,200,000
Current remaining borrowing capacity		884,800
Long-term debt		110,500	$ 0
Letters of credit outstanding, amount		4,700
Line of credit facility, maximum letters of credit		$ 400,000
Line of credit facility, covenant terms		The Revolving Credit Agreement is subject to maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements, which may limit the amount we can borrow to an amount less than the total amount available for borrowing. For the rolling period ending December 31, 2021, the maximum allowed consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) may not exceed 5.00-to-1.00 and the minimum consolidated interest coverage ratio (as defined in the Revolving Credit Agreement), must not be less than 1.75-to-1.00. The Revolving Credit Agreement also contains customary restrictive covenants, such as limitations on indebtedness, liens, mergers, asset transfers and certain investing activities.
Line of credit facility, interest rate description		The interest rate on the Revolving Credit Agreement is subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. In August of 2020, Moody’s Investor Service Inc. downgraded our credit rating from Ba2 to Ba3. This rating downgrade caused the interest rate on our Revolving Credit Agreement to increase by 0.25% effective August 2020. The interest rate on the Revolving Credit Agreement and certain fees under the Receivables Financing Agreement, defined below, are the only debt arrangements that are subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies.
Line of credit facility, interest rate at period end		2.90%
Line of credit facility, interest rate during period		2.70%
Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum letters of credit	$ 500,000
Line of credit facility, description of amendment	On January 28, 2022, we amended and restated our unsecured Revolving Credit Agreement to, among other things: (i) extend the maturity date from October 27, 2023 to April 27, 2025; (ii) increase the maximum amount of letters of credit capable of being issued from $400.0 million to $500.0 million; (iii) replace LIBOR benchmark provisions with customary secured overnight financing rate, or SOFR, benchmark provisions; (iv) remove the 0.50x increase permitted in our consolidated debt coverage ratio for certain rolling periods in which an acquisition for aggregate net consideration of at least $50.0 million occurs; and (v) add baskets and exceptions to certain negative covenants.

DEBT Narrative 4 - Senior Notes (Details) - USD ($) $ in Thousands			12 Months Ended
	Sep. 14, 2020	May 22, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2021	Jan. 31, 2021	Aug. 31, 2020
Debt Instrument [Line Items]
Proceeds from note offerings, net of issuance costs	$ 1,182,000		$ 0	$ 1,182,035	$ 491,580
4.75% senior notes
Debt Instrument [Line Items]
Long-term debt				250,000		$ 250,000
Long-term debt, rate						4.75%
6.75% senior notes
Debt Instrument [Line Items]
Long-term debt				300,000			$ 300,000
Long-term debt, rate							6.75%
4.80% senior notes
Debt Instrument [Line Items]
Long-term debt								$ 450,000
Long-term debt, rate								4.80%
5.75% senior notes
Debt Instrument [Line Items]
Long-term debt	$ 600,000		$ 600,000	600,000
Long-term debt, rate	5.75%		5.75%
Debt instrument, redemption, description			If we undergo a change of control, as defined in the supplemental indentures for the NuStar Logistics Senior Notes, each holder of the applicable senior notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes repurchased, plus any accrued and unpaid interest to the date of repurchase.
6.375% senior notes
Debt Instrument [Line Items]
Long-term debt	$ 600,000		$ 600,000	600,000
Long-term debt, rate	6.375%		6.375%
Debt instrument, redemption, description			If we undergo a change of control, as defined in the supplemental indentures for the NuStar Logistics Senior Notes, each holder of the applicable senior notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes repurchased, plus any accrued and unpaid interest to the date of repurchase.
6.00% senior notes
Debt Instrument [Line Items]
Long-term debt		$ 500,000	$ 500,000	500,000
Long-term debt, rate			6.00%
Proceeds from note offerings, net of issuance costs		$ 491,600
Debt instrument, redemption, description			If we undergo a change of control, as defined in the supplemental indentures for the NuStar Logistics Senior Notes, each holder of the applicable senior notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes repurchased, plus any accrued and unpaid interest to the date of repurchase.
5.625% senior notes
Debt Instrument [Line Items]
Long-term debt			$ 550,000	$ 550,000
Long-term debt, rate			5.625%
Debt instrument, redemption, description			If we undergo a change of control, as defined in the supplemental indentures for the NuStar Logistics Senior Notes, each holder of the applicable senior notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes repurchased, plus any accrued and unpaid interest to the date of repurchase.
Logistics Notes due 2025 and Logistics Notes due 2030
Debt Instrument [Line Items]
Long-term debt, issuance costs	$ 18,000

DEBT Narrative 5 - Subordinated Notes (Details) - Subordinated Notes - USD ($) $ in Thousands		12 Months Ended
	Jan. 15, 2018	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt		$ 402,500	$ 402,500
Debt instrument, interest rate terms		an annual rate equal to the sum of the three-month LIBOR for the related quarterly interest period, plus 6.734% payable quarterly, commencing April 15, 2018, unless payment is deferred in accordance with the terms of the notes. NuStar Logistics may elect to defer interest payments on the Subordinated Notes on one or more occasions for up to five consecutive years.
Long-term debt, rate		6.90%
Debt instrument, redemption price, percentage	100.00%

DEBT Narrative 6 - GoZone Bonds (Details) - USD ($) $ in Thousands				12 Months Ended
	Sep. 14, 2020	Jun. 03, 2020	Mar. 04, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt repayments				$ 1,389,700	$ 1,813,963	$ 928,900
Proceeds from note offerings, net of issuance costs	$ 1,182,000			0	1,182,035	491,580
Gulf Opportunity Zone revenue bonds
Debt Instrument [Line Items]
Long-term debt				$ 322,140	$ 322,140	$ 365,400
Long-term debt repayments			$ 43,300
Proceeds from note offerings, net of issuance costs		$ 0

DEBT Table 3 - GoZone Bonds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Go Zone Bonds Due June 2038
Debt Instrument [Line Items]
Date issued	Jun. 26, 2008
Long-term debt	$ 55,440
Long-term debt, rate	6.10%
Maturity date	Jun. 01, 2038
Go Zone Bonds Due July 2040
Debt Instrument [Line Items]
Date issued	Jul. 15, 2010
Long-term debt	$ 100,000
Long-term debt, rate	6.35%
Maturity date	Jul. 01, 2040
Go Zone Bonds Due October 2040
Debt Instrument [Line Items]
Date issued	Oct. 07, 2010
Long-term debt	$ 43,300
Long-term debt, rate	6.35%
Maturity date	Oct. 01, 2040
Go Zone Bonds Due December 2040
Debt Instrument [Line Items]
Date issued	Dec. 29, 2010
Long-term debt	$ 48,400
Long-term debt, rate	6.10%
Maturity date	Dec. 01, 2040
Go Zone Bonds Due August 2041
Debt Instrument [Line Items]
Date issued	Aug. 09, 2011
Long-term debt	$ 75,000
Long-term debt, rate	5.85%
Maturity date	Aug. 01, 2041
Total Gulf Opportunity Zone revenue bonds
Debt Instrument [Line Items]
Long-term debt	$ 322,140	$ 322,140	$ 365,400
Debt instrument description	Interest on the GoZone Bonds accrues from June 3, 2020 and is payable semi-annually on June 1 and December 1 of each year, beginning December 1, 2020. The holders of the Series 2008, Series 2010B and Series 2011 GoZone Bonds are required to tender their bonds at the applicable mandatory purchase date in exchange for 100% of the principal plus accrued and unpaid interest, after which these bonds will potentially be remarketed with a new interest rate established. Each of the Series 2010 and Series 2010A GoZone Bonds is subject to redemption on or after June 1, 2030 by the Parish of St. James, at our option, in whole or in part, at a redemption price of 100% of the principal amount to be redeemed plus accrued interest. The Series 2008, Series 2010B and Series 2011 GoZone Bonds are not subject to optional redemption. NuStar Logistics’ agreements with the Parish of St. James related to the GoZone Bonds contain (i) customary restrictive covenants that limit the ability of NuStar Logistics and its subsidiaries, to, among other things, create liens or enter into sale-leaseback transactions, consolidations, mergers or asset sales and (ii) a change of control provision that provides each holder the right to require the trustee, with funds provided by NuStar Logistics, to repurchase all or a portion of that holder’s GoZone Bonds upon a change of control at a price equal to 101% of the aggregate principal amount repurchased, plus any accrued and unpaid interest.

DEBT Narrative 7 - Receivables Financing Agreement (Details) - Receivables Financing Agreement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 02, 2020
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100.0		$ 125.0
Debt instrument, collateral amount	$ 119.2	$ 110.6
Weighted average annual interest rate	2.30%

DEBT Narrative 8 - Term Loan (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 16, 2020	Sep. 30, 2020	Dec. 31, 2021	Apr. 19, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 15, 2020	Sep. 14, 2020	Apr. 21, 2020
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ (137,900)	$ 0		$ (141,746)	$ 0
Early Repayment Premiums [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ (97,600)
Unamortized Debt Issuance Costs, Unamortized Discount, and Commitment Fee [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ (40,300)
Unsecured Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 750,000
Long-term debt, term									3 years
The Term Loan, Initial Loan							$ 500,000		$ 500,000
Debt instrument, unamortized discount									$ 22,500
Original issue discount									3.00%
Long-term debt, issuance costs									$ 14,400
Long-term debt, rate									12.00%
Debt instrument, unused borrowing capacity, amount				$ 250,000
Commitment fee				5.00%
5.75% senior notes
Debt Instrument [Line Items]
Long-term debt, rate			5.75%					5.75%
6.375% senior notes
Debt Instrument [Line Items]
Long-term debt, rate			6.375%					6.375%

HEALTH, SAFETY AND ENVIRONMENTAL MATTERS Table 1 - Balance of and Changes in Accruals for Environmental Matters (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance as of the beginning of year	$ 8,373	$ 7,938
Additions to accrual	2,044	3,692
Payments	(2,669)	(3,257)
Balance as of the end of year	$ 7,748	$ 8,373

HEALTH, SAFETY AND ENVIRONMENTAL MATTERS Table 2 - Accruals for Environmental Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]
Accrued liabilities	$ 3,378	$ 5,371
Other long-term liabilities	4,370	3,002
Accruals for environmental matters	$ 7,748	$ 8,373	$ 7,938

COMMITMENTS, CONTINGENCIES AND UNCERTAINTIES Table - Commitments (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2022	$ 10,606
2023	5,125
2024	2,226
2025	1,552
2026	753
Thereafter	5,466
Total	$ 25,728

COMMITMENTS, CONTINGENCIES AND UNCERTAINTIES Narrative 1 - Commitments (Details)	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Description of purchase obligations	Our purchase obligations primarily consist of an eleven-year chemical supply agreement related to our pipelines that terminates in 2022 and various service agreements with information technology providers.

COMMITMENTS, CONTINGENCIES AND UNCERTAINTIES Narrative 2 (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual, at carrying value	$ 0.1	$ 2.6

LEASE ASSETS AND LIABILITIES Narrative 1 (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Operating Lease Type [Line Items]
Operating lease, liability	$ 75,406	$ 85,789
Operating lease, right-of-use asset	$ 76,867	$ 87,443
Lessee, finance lease, description	The primary component of our finance lease portfolio is a dock at our Corpus Christi North Beach terminal facility, which includes a commitment for minimum dockage and wharfage throughput volumes. The dock lease has a remaining term of approximately four years and three additional five-year renewal periods, all of which we are reasonably certain to exercise.
Lessee, finance lease, remaining lease term	4 years
Number of renewal periods	3
Lessee, Finance Lease, Description [Abstract]
Lessee, finance lease, description	The primary component of our finance lease portfolio is a dock at our Corpus Christi North Beach terminal facility, which includes a commitment for minimum dockage and wharfage throughput volumes. The dock lease has a remaining term of approximately four years and three additional five-year renewal periods, all of which we are reasonably certain to exercise.
Lessee, finance lease, remaining lease term	4 years
Number of renewal periods	3
Lessee, finance lease, renewal term	5 years
Land and dock leases [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, description	Our operating leases consist primarily of land and dock leases at various terminal facilities.
Land and dock leases [Member] \| Maximum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	4 years
Lessee, operating lease, renewal term	20 years
Marine vessel leases [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, description	three leases for marine vessels at our Point Tupper terminal facility
Lessee, operating lease, term of contract		5 years
Operating lease, liability		$ 20,100
Operating lease, right-of-use asset		$ 20,100

LEASE ASSETS AND LIABILITIES Table 1 (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease, right-of-use asset	$ 76,867	$ 87,443
Finance lease, right-of-use asset	71,002	73,319
Finance lease, right-of-use asset, accumulated amortization	13,561	8,444
Operating lease liabilities, current	10,346	10,890
Operating lease liabilities, noncurrent	65,060	74,899
Total operating lease liabilities	75,406	85,789
Finance lease liability, current	3,848	3,839
Finance lease liability, noncurrent	52,930	54,238
Total finance lease liabilities	$ 56,778	$ 58,077
Operating lease, right-of-use asset, statement of financial position [extensible list]	Other long-term assets, net	Other long-term assets, net
Finance lease, right-of-use asset, statement of financial position [extensible list]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Operating lease, liability, current, statement of financial position [extensible list]	Accrued liabilities	Accrued liabilities
Operating lease, liability, noncurrent, statement of financial position [extensible list]	Other long-term liabilities	Other long-term liabilities
Finance lease, liability, current, statement of financial position [extensible list]	us-gaap:DebtCurrent	us-gaap:DebtCurrent
Finance lease, liability, noncurrent, statement of financial position [extensible list]	Long-term debt, less current portion	Long-term debt, less current portion

LEASE ASSETS AND LIABILITIES Table 2 (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2022	$ 12,252
2023	10,960
2024	10,656
2025	8,705
2026	5,876
Thereafter	48,542
Total lease payments	96,991
Less: Interest	21,585
Present value of lease liability	75,406	$ 85,789
Finance Lease, Liability, Payment, Due [Abstract]
2022	5,831
2023	5,705
2024	5,217
2025	4,424
2026	3,979
Thereafter	52,399
Total lease payments	77,555
Less: Interest	20,777
Present value of lease liabilities	$ 56,778	$ 58,077

LEASE ASSETS AND LIABILITIES Table 3 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 15,323	$ 16,814	$ 29,167
Amortization of right-of-use assets	5,251	4,700	3,748
Interest expense on lease liability	2,081	2,201	2,212
Short-term lease cost	14,198	15,359	19,140
Variable lease cost	4,939	8,653	6,990
Total lease cost	$ 41,792	$ 47,727	$ 61,257

LEASE ASSETS AND LIABILITIES Table 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Leases [Abstract]
Cash outflows from operating activities	$ 12,829	$ 14,487	$ 27,567
Right-of-use assets obtained in exchange for lease liabilities	$ 3,278	$ 20,830	$ 2,153
Weighted-average remaining lease term (in years)	13 years	13 years	15 years
Weighted-average discount rate	3.20%	3.20%	3.60%
Finance Leases [Abstract]
Cash outflows from operating activities	$ 2,090	$ 2,208	$ 2,027
Cash outflows from financing activities	4,244	4,981	3,700
Right-of-use assets obtained in exchange for lease liabilities	$ 3,173	$ 3,077	$ 4,430
Weighted-average remaining lease term (in years)	18 years	19 years	20 years
Weighted-average discount rate	3.60%	3.70%	3.70%

LEASE ASSETS AND LIABILITIES Narrative 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2017
Lessor, Lease, Description [Line Items]
Lessor, operating lease, term of contract				10 years
Lessor, operating lease, payments to be received	$ 195,600
Storage Segment
Lessor, Lease, Description [Line Items]
Operating lease, lease income	41,454	$ 41,314	$ 40,774
Service revenues [Member] \| Storage Segment
Lessor, Lease, Description [Line Items]
Operating lease, lease income	$ 41,500	$ 41,300	$ 40,800

LEASE ASSETS AND LIABILITIES Table 5 (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Lease storage assets, at cost	$ 246,841,000	$ 241,664,000
Less accumulated depreciation	(139,200,000)	(130,217,000)
Lease storage assets, net	$ 107,641,000	$ 111,447,000
Estimated useful life	30 years

DERIVATIVES AND FAIR VALUE MEASUREMENTS Narrative (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
	May 31, 2020	Jun. 30, 2020	May 31, 2020	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Cash paid for termination of interest rate swaps		$ 49,200
4.75% senior notes
Derivative Instruments, Gain (Loss) [Line Items]
Long-term debt						$ 250,000		$ 250,000
Long-term debt, rate								4.75%
Interest rate swaps \| Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification of loss on cash flow hedges to interest expense, net					$ 5,664	$ 4,265	$ 3,814
Interest rate swaps \| Interest expense, net \| Reclassification due to Early Repayment of $250.0 Million 4.75% Senior Notes
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification of loss on cash flow hedges to interest expense, net				$ 800
Interest rate swaps \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps interest rate received			received a rate based on the three-month USD LIBOR
Notional amount of forward-starting interest rate swaps terminated	$ 250,000

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 1 - Fair Value of Unwound Interest Rate Swap Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Long-Term Debt, Less Current Portion [Member]
Derivatives, Fair Value
Fair market value of unwound fixed-to-floating interest rate swaps	$ 0	$ 1,363
Accumulated Other Comprehensive Income (Loss) [Member]
Derivatives, Fair Value
Fair market value of unwound forward starting interest rate swaps	$ (36,486)	$ (42,150)

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 2 - Impact of Derivatives on Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) to be reclassified during next 12 months, forward-starting interest rate swaps	$ (2,100)
Interest rate swaps \| Other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized loss on cash flow hedges	0	$ (30,291)	$ (19,045)
Interest rate swaps \| Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification of loss on cash flow hedges to interest expense, net	$ 5,664	$ 4,265	$ 3,814

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 3 (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value, long-term debt	$ 3,459,153	$ 3,799,378
Long-term debt, including current portion and excluding finance leases	$ 3,130,625	$ 3,539,258

- Definition

+ References + Details

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Table (Details) - $ / shares	Dec. 31, 2021	Dec. 31, 2020	Jul. 13, 2018	Jun. 29, 2018
Class of Stock [Line Items]
Series D preferred units issued	23,246,650		7,486,209	15,760,441
Series D preferred units outstanding	23,246,650	23,246,650	7,486,209	15,760,441
Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Units issued, price per unit			$ 25.38	$ 25.38

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative 1 - Distributions (Details) - Series D Preferred Limited Partner [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Required amount of per unit cash dividends to permit dividend paid in kind		$ 0.635
Unpaid dividend penalty, per unit dividend increase		$ 0.048
Unpaid dividend penalty, preferred stock, conversion basis		if we fail to pay in full any Series D Preferred Unit distribution amount for three consecutive distribution periods, then until we pay such distributions in full: (i) each holder of the Series D Preferred Units may elect to convert its Series D Preferred Units into common units on a one-for-one basis, plus any unpaid Series D distributions
Unpaid dividend penalty, minimum amount of acquisitions or asset sales requiring consent		$ 50.0
Preferred Stock, Distributions, Period - June 29, 2018 to June 28, 2020 [Member]
Class of Stock [Line Items]
Preferred units distribution percentage		9.75%
Preferred stock, dividend rate, amount per annum		$ 57.6
Cash distributions per unit applicable to limited partners		$ 0.619
Preferred Stock, Distributions, Period - June 29, 2020 to June 28, 2023 [Member]
Class of Stock [Line Items]
Preferred units distribution percentage		10.75%
Preferred stock, dividend rate, amount per annum		$ 63.4
Cash distributions per unit applicable to limited partners		$ 0.682
Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]
Class of Stock [Line Items]
Preferred unit, distribution payment rate, variable description		the greater of 13.75%, or $81.1 million, per annum ($0.872 per unit per distribution period) or the distribution per common unit thereafter
Minimum [Member] \| Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]
Class of Stock [Line Items]
Preferred units distribution percentage		13.75%
Preferred stock, dividend rate, amount per annum		$ 81.1
Cash distributions per unit applicable to limited partners		$ 0.872
Subsequent Event [Member]
Class of Stock [Line Items]
Cash distributions per unit applicable to limited partners	$ 0.682

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative 2 (Details) - Series D Preferred Limited Partner [Member] $ in Millions		12 Months Ended
	Jul. 20, 2018	Dec. 31, 2021 USD ($)
Class of Stock [Line Items]
Convertible preferred units, terms of redemption		The Partnership may redeem all or any portion of the Series D Preferred Units, in an amount not less than $50.0 million for cash at a redemption price equal to, as applicable: (i) $31.73 per Series D Preferred Unit at any time on or after June 29, 2023 but prior to June 29, 2024; (ii) $30.46 per Series D Preferred Unit at any time on or after June 29, 2024 but prior to June 29, 2025; (iii) $29.19 per Series D Preferred Unit at any time on or after June 29, 2025; plus, in each case, the sum of any unpaid distributions on the applicable Series D Preferred Unit plus the distributions prorated for the number of days elapsed (not to exceed 90) in the period of redemption (Series D Partial Period Distributions). The holders have the option to convert the units prior to such redemption as discussed above. Additionally, at any time on or after June 29, 2028, each holder of Series D Preferred Units will have the right to require the Partnership to redeem all of the Series D Preferred Units held by such holder at a redemption price equal to $29.19 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions. If a holder of Series D Preferred Units exercises its redemption right, the Partnership may elect to pay up to 50% of such amount in common units (which shall be valued at 93% of a volume-weighted average trading price of the common units); provided, that the common units to be issued do not, in the aggregate, exceed 15% of NuStar Energy’s common equity market capitalization at the time.
Minimum conversion amount		$ 50.0
Maximum number of days within a partial distribution period		90
Convertible preferred units, terms of conversion, change of control		convert its Series D Preferred Units into common units on a one-for-one basis, plus any unpaid Series D distributions
Change of control redemption amount		the sum of (a) $29.82 per Series D Preferred Unit plus (b) any unpaid Series D distributions plus (c) the applicable distribution amount for the distribution periods ending after the change of control event and prior to (but including) the fourth anniversary of the Initial Closing
Temporary equity, accounting treatment		The Series D Preferred Units include redemption provisions at the option of the holders of the Series D Preferred Units and upon a Series D Change of Control (as defined in the partnership agreement), which are outside the Partnership’s control. Therefore, the Series D Preferred Units are presented in the mezzanine section of the consolidated balance sheets. The Series D Preferred Units have been recorded at their issuance date fair value, net of issuance costs. We reassess the presentation of the Series D Preferred Units in our consolidated balance sheets on a quarterly basis. The Series D Preferred Units are subject to accretion from their carrying value at the issuance date to the redemption value, which is based on the redemption right of the Series D Preferred Unit holders that may be exercised at any time on or after June 29, 2028, using the effective interest method over a period of ten years. In the calculation of net income per unit, the accretion is treated in the same manner as a distribution and deducted from net income to arrive at net income attributable to common units.
Accretion period	10 years
Preferred Stock, Conversion, Period - June 29, 2020 and thereafter [Member]
Class of Stock [Line Items]
Convertible preferred units, terms of conversion		Each holder of Series D Preferred Units may convert all or any portion of its Series D Preferred Units into common units on a one-for-one basis (plus any unpaid Series D distributions), subject to anti-dilution adjustments, at any time, but not more than once per quarter, so long as any conversion is for at least $50.0 million based on the Series D Preferred Unit Purchase Price (or such lesser amount representing all of a holder’s Series D Preferred Units).
Preferred Stock, Issuer Redemption Option, Period - June 29, 2023 to June 28, 2024 [Member]
Class of Stock [Line Items]
Temporary equity redemption price per unit		$31.73 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions
Preferred Stock, Issuer Redemption Option, Period - June 29, 2023 and thereafter [Member]
Class of Stock [Line Items]
Minimum redemption amount		$ 50.0
Preferred Stock, Holder Redemption Option, Period - June 29, 2028 and thereafter [Member]
Class of Stock [Line Items]
Temporary equity redemption price per unit		$29.19 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions
Percentage of redemption amount that may be paid in common limited partner units		50.00%
Volume-weighted average trading price percentage of common limited partner units		93.00%
Common limited partners' equity market capitalization, maximum allowable percentage		15.00%
Preferred Stock, Issuer Redemption Option, Period - June 29, 2024 to June 28, 2025 [Member]
Class of Stock [Line Items]
Temporary equity redemption price per unit		$30.46 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions
Preferred Stock, Issuer Redemption Option, Period - June 29, 2025 and thereafter [Member]
Class of Stock [Line Items]
Temporary equity redemption price per unit		$29.19 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions

PARTNERS' EQUITY Table 1 - Preferred Units Issued and Outstanding (Details) - USD ($)				12 Months Ended	61 Months Ended
	Nov. 30, 2017	Apr. 28, 2017	Nov. 25, 2016	Dec. 31, 2021	Dec. 14, 2021	Dec. 31, 2020
Series A Preferred Limited Partner [Member]
Class of Stock [Line Items]
Issuance of units (units)			9,060,000
Preferred units outstanding				9,060,000		9,060,000
Units issued, price per unit			$ 25.00
Preferred units liquidation preference			$ 25.00
Preferred units distribution percentage, fixed			8.50%
Per unit distribution, fixed, per annum			$ 2.125
Preferred stock, dividend rate, amount per annum					$ 19,252
Preferred unit, distribution payment rate, variable description			Three-month LIBOR plus 6.766%
Series B Preferred Limited Partner [Member]
Class of Stock [Line Items]
Issuance of units (units)		15,400,000
Preferred units outstanding				15,400,000		15,400,000
Units issued, price per unit		$ 25.00
Preferred units liquidation preference		$ 25.00
Preferred units distribution percentage, fixed		7.625%
Per unit distribution, fixed, per annum		$ 1.90625
Preferred stock, dividend rate, amount per annum				$ 29,357
Preferred unit, distribution payment rate, variable description		Three-month LIBOR plus 5.643%
Series C Preferred Limited Partner [Member]
Class of Stock [Line Items]
Issuance of units (units)	6,900,000
Preferred units outstanding				6,900,000		6,900,000
Units issued, price per unit	$ 25.00
Preferred units liquidation preference	$ 25.00
Preferred units distribution percentage, fixed	9.00%
Per unit distribution, fixed, per annum	$ 2.25
Preferred stock, dividend rate, amount per annum				$ 15,525
Preferred unit, distribution payment rate, variable description	Three-month LIBOR plus 6.88%

PARTNERS' EQUITY - Table 2 Preferred Units - Floating Distribution Rate (Details) - Series A Preferred Limited Partner [Member] - USD ($)		3 Months Ended
	Nov. 25, 2016	Mar. 14, 2022
Distribution Made to Limited Partner [Line Items]
Per unit distribution, variable, per quarter	$ 2.125
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]
Per unit distribution, variable, per quarter		$ 0.43606
Distributions to partners		$ 3,951

PARTNERS' EQUITY Narrative 1 (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Nov. 26, 2019	Nov. 30, 2017	Apr. 28, 2017	Nov. 25, 2016	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Proceeds from issuance of common units	$ 15,000				$ 0	$ 0	$ 15,000
Common Limited Partner [Member]
Class of Stock [Line Items]
Issuance of units (units)	527,426				0	0	527,426
Units issued, price per unit	$ 28.44
Series A Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units, description					We may redeem any of our outstanding Series A, B and C Preferred Units at any time on or after the optional redemption date set forth above for each series of the Series A, B and C Preferred Units, in whole or in part, at a redemption price of $25.00 per unit plus an amount equal to all accumulated and unpaid distributions to, but not including, the date of redemption, whether or not declared. We may also redeem the Series A, B and C Preferred Units upon the occurrence of certain rating events or a change of control as defined in our partnership agreement. In the case of the latter instance, if we choose not to redeem the Series A, B and C Preferred Units, those preferred unitholders may have the ability to convert their Series A, B and C Preferred Units to common units at the then applicable conversion rate. Holders of the Series A, B and C Preferred Units have no voting rights except for certain exceptions set forth in our partnership agreement.
Issuance of units (units)				9,060,000
Units issued, price per unit				$ 25.00
Series C Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units, description					We may redeem any of our outstanding Series A, B and C Preferred Units at any time on or after the optional redemption date set forth above for each series of the Series A, B and C Preferred Units, in whole or in part, at a redemption price of $25.00 per unit plus an amount equal to all accumulated and unpaid distributions to, but not including, the date of redemption, whether or not declared. We may also redeem the Series A, B and C Preferred Units upon the occurrence of certain rating events or a change of control as defined in our partnership agreement. In the case of the latter instance, if we choose not to redeem the Series A, B and C Preferred Units, those preferred unitholders may have the ability to convert their Series A, B and C Preferred Units to common units at the then applicable conversion rate. Holders of the Series A, B and C Preferred Units have no voting rights except for certain exceptions set forth in our partnership agreement.
Issuance of units (units)		6,900,000
Units issued, price per unit		$ 25.00
Series B Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units, description					We may redeem any of our outstanding Series A, B and C Preferred Units at any time on or after the optional redemption date set forth above for each series of the Series A, B and C Preferred Units, in whole or in part, at a redemption price of $25.00 per unit plus an amount equal to all accumulated and unpaid distributions to, but not including, the date of redemption, whether or not declared. We may also redeem the Series A, B and C Preferred Units upon the occurrence of certain rating events or a change of control as defined in our partnership agreement. In the case of the latter instance, if we choose not to redeem the Series A, B and C Preferred Units, those preferred unitholders may have the ability to convert their Series A, B and C Preferred Units to common units at the then applicable conversion rate. Holders of the Series A, B and C Preferred Units have no voting rights except for certain exceptions set forth in our partnership agreement.
Issuance of units (units)			15,400,000
Units issued, price per unit			$ 25.00

PARTNERS' EQUITY Table 2 - Balance of and Changes in Common Units Outstanding (Details) - shares		12 Months Ended
	Nov. 26, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Limited partners common units outstanding (in units)		109,986,273	109,468,127
Common Limited Partner [Member]
Class of Stock [Line Items]
Limited partners common units outstanding (in units)		109,986,273	109,468,127	108,527,806	107,225,156
Issuance of units (units)	527,426	0	0	527,426
Unit-based compensation (units)		518,146	940,321	775,224

PARTNERS' EQUITY Narrative 2 (Details)	12 Months Ended
PARTNERS' EQUITY Narrative 2 (Details)	Dec. 31, 2021
Partners' Capital Notes [Abstract]
Percent of available cash distributed	100.00%
Number of days within which distribution is paid to common unitholders	45

PARTNERS' EQUITY Table 3 - Cash Distributions Declared - Common Limited Partners (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Distribution Made to Limited Partner [Line Items]
Common limited partners' distribution, per unit	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 1.60	$ 1.60	$ 2.40
Common limited partners' distribution	$ 44,008	$ 43,814	$ 43,814	$ 43,834	$ 175,470	$ 174,873	$ 259,136
Common Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Distribution date of record (distribution earned)	Feb. 08, 2022	Nov. 08, 2021	Aug. 06, 2021	May 10, 2021
Distribution payment date	Feb. 14, 2022	Nov. 12, 2021	Aug. 12, 2021	May 14, 2021

PARTNERS' EQUITY Table 4 - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (96,656)
Other comprehensive income (loss)	22,678	$ (28,760)	$ (13,018)
Ending balance	(73,978)	(96,656)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(42,362)	(43,772)	(47,299)
Other comprehensive income (loss) before reclassifications	601	1,410	3,527
Other comprehensive income (loss)	601	1,410	3,527
Ending balance	(41,761)	(42,362)	(43,772)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(42,150)	(16,124)	(893)
Other comprehensive income (loss) before reclassifications	0	(30,291)	(19,045)
Other comprehensive income (loss)	5,664	(26,026)	(15,231)
Ending balance	(36,486)	(42,150)	(16,124)
Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(12,144)	(8,000)	(6,686)
Other comprehensive income (loss) before reclassifications	17,721	(2,924)	1,000
Other comprehensive income (loss)	16,413	(4,144)	(1,314)
Ending balance	4,269	(12,144)	(8,000)
Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(96,656)	(67,896)	(54,878)
Other comprehensive income (loss) before reclassifications	18,322	(31,805)	(14,518)
Other comprehensive income (loss)	22,678	(28,760)	(13,018)
Ending balance	(73,978)	(96,656)	(67,896)
Interest expense, net \| Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain) reclassified from AOCI	0	0	0
Interest expense, net \| Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain) reclassified from AOCI	5,664	4,265	3,814
Interest expense, net \| Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain) reclassified from AOCI	0	0	0
Interest expense, net \| Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain) reclassified from AOCI	5,664	4,265	3,814
Pension Plan [Member] \| Other Income [Member] \| Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain) reclassified from AOCI	0	0	0
Pension Plan [Member] \| Other Income [Member] \| Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain) reclassified from AOCI	0	0	0
Pension Plan [Member] \| Other Income [Member] \| Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain) reclassified from AOCI	(1,308)	(1,220)	(2,314)
Pension Plan [Member] \| Other Income [Member] \| Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain) reclassified from AOCI	$ (1,308)	$ (1,220)	$ (2,314)

NET INCOME (LOSS) PER COMMON UNIT Table - Net (Loss) Income per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income (loss)					$ 38,225	$ (198,983)	$ (105,693)
Distributions to preferred limited partners					(127,399)	(124,882)	(121,693)
Distributions to common limited partners	$ (44,008)	$ (43,814)	$ (43,814)	$ (43,834)	(175,470)	(174,873)	(259,136)
Distribution equivalent rights to restricted units					(2,396)	(2,093)	(2,659)
Distributions in excess of income (loss)					(267,040)	(500,831)	(489,181)
Distributions to common limited partners	$ 44,008	$ 43,814	$ 43,814	$ 43,834	175,470	174,873	259,136
Allocation of distributions in excess of income (loss)					(267,040)	(500,831)	(489,181)
Series D Preferred Unit accretion (refer to Note 17)					(16,903)	(17,626)	(18,085)
Net loss attributable to common units					$ (108,473)	$ (343,584)	$ (248,130)
Basic weighted-average common units outstanding					109,585,635	109,155,117	107,789,030
Basic weighted-average common units outstanding					109,585,635	109,155,117	107,789,030
Effect of dilutive potential common units					0	0	65,669
Diluted weighted-average common units outstanding					109,585,635	109,155,117	107,854,699
Basic net income (loss) per common unit					$ (0.99)	$ (3.15)	$ (2.30)
Diluted net income (loss) per common unit					$ (0.99)	$ (3.15)	$ (2.30)

SUPPLEMENTAL CASH FLOW INFORMATION Table 1 - Changes in Current Assets and Current Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Accounts receivable	$ (2,105)	$ 14,589	$ (23,480)
Inventories	(5,585)	1,340	(866)
Prepaid and other current assets	(1,710)	(3,326)	(5,103)
Accounts payable	10,202	(25,455)	8,068
Accrued interest payable	(16,708)	12,922	1,632
Accrued liabilities	4,448	7,886	(19,740)
Taxes other than income tax	(2,689)	3,972	(5,276)
Changes in current assets and current liabilities	$ (14,147)	$ 11,928	$ (44,765)

SUPPLEMENTAL CASH FLOW INFORMATION Table 2 - Cash Flows Related to Interest and Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of amount capitalized	$ 218,181	$ 204,511	$ 176,859
Cash paid for income taxes, net of tax refunds received	$ 5,491	$ 3,260	$ 6,817

SUPPLEMENTAL CASH FLOW INFORMATION Table 3 - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 5,637	$ 153,625
Cash, cash equivalents and restricted cash	14,439	162,426	$ 24,980	$ 13,644
Cash and Cash Equivalents [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	5,637	153,625
Other long-term assets, net
Restricted Cash and Cash Equivalents Items [Line Items]
Cash, cash equivalents and restricted cash	$ 8,802	$ 8,801

EMPLOYEE BENEFIT PLANS Narrative 1 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Thrift Plan, description	The NuStar Thrift Plan (the Thrift Plan) is a qualified defined contribution plan that became effective June 26, 2006. Participation in the Thrift Plan is voluntary and open to substantially all our domestic employees upon their dates of hire. Thrift Plan participants can contribute from 1% up to 30% of their total annual compensation to the Thrift Plan in the form of pre-tax and/or after tax employee contributions. We make matching contributions in an amount equal to 100% of each participant’s employee contributions up to a maximum of 6% of the participant’s total annual compensation.
Thrift Plan matching contributions	$ 7.6	$ 7.8	$ 7.6
Benefit plan costs, international employees	$ 0.6	$ 0.5	$ 0.9
Pension Plan, description	The NuStar Pension Plan (the Pension Plan) is a qualified non-contributory defined benefit pension plan that provides eligible U.S. employees with retirement income as calculated under a cash balance formula. Under the cash balance formula, benefits are determined based on age, years of vesting service and interest credits, and employees become fully vested in their benefits upon attaining three years of vesting service. Prior to January 1, 2014, eligible employees were covered under either a cash balance formula or a final average pay formula (FAP). Effective January 1, 2014, the Pension Plan was amended to freeze the FAP benefits as of December 31, 2013, and going forward, all eligible employees are covered under the cash balance formula discussed above.

EMPLOYEE BENEFIT PLANS Table 1 - Changes in Benefit Obligation/Fair Value of Plan Assets/Funded Status/Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan [Member]
Change in benefit obligation:
Benefit obligation, January 1	$ 186,685	$ 167,257
Service cost	9,978	9,174	$ 9,549
Interest cost	4,084	4,693	5,480
Benefits paid	(19,366)	(9,520)
Participant contributions	0	0
Actuarial loss (gain)	(694)	15,081
Other	(780)	0
Benefit obligation, December 31	179,907	186,685	167,257
Lump-sum payments due to Eastern U.S. Terminals Disposition and Texas City Sale	9,600
Change in plan assets:
Plan assets at fair value, January 1	182,727	159,036
Actual return on plan assets	26,425	21,758
Employer contributions	52	11,453
Benefits paid	(19,366)	(9,520)
Participant contributions	0	0
Plan assets at fair value, December 31	189,838	182,727	159,036
Reconciliation of funded status:
Fair value of plan assets at December 31	189,838	182,727	159,036
Less: Benefit obligation at December 31	179,907	186,685	167,257
Funded status at December 31	9,931	(3,958)
Amounts recognized in the consolidated balance sheets:
Other long-term assets, net	14,945	0
Accrued liabilities	(467)	(382)
Other long-term liabilities	(4,547)	(3,576)
Net pension asset (liability)	9,931	(3,958)
Accumulated benefit obligation for the Pension Plans	171,899	181,263
Pension Plan [Member] \| Excess Pension Plan [Member]
Change in plan assets:
Plan assets at fair value, January 1	0
Plan assets at fair value, December 31	0	0
Reconciliation of funded status:
Fair value of plan assets at December 31	0	0
Amounts recognized in the consolidated balance sheets:
Accumulated benefit obligation for the Pension Plans	4,300	3,800
Pension Plan [Member] \| Excess Pension Plan and Other Postretirement Benefit Plans
Change in plan assets:
Plan assets at fair value, January 1	0
Plan assets at fair value, December 31	0	0
Reconciliation of funded status:
Fair value of plan assets at December 31	0	0
Other Postretirement Benefit Plans [Member]
Change in benefit obligation:
Benefit obligation, January 1	14,680	13,196
Service cost	593	529	431
Interest cost	326	399	453
Benefits paid	(257)	(281)
Participant contributions	44	44
Actuarial loss (gain)	884	793
Other	0	0
Benefit obligation, December 31	16,270	14,680	13,196
Change in plan assets:
Plan assets at fair value, January 1	0	0
Actual return on plan assets	0	0
Employer contributions	213	237
Benefits paid	(257)	(281)
Participant contributions	44	44
Plan assets at fair value, December 31	0	0	0
Reconciliation of funded status:
Fair value of plan assets at December 31	0	0	0
Less: Benefit obligation at December 31	16,270	14,680	$ 13,196
Funded status at December 31	(16,270)	(14,680)
Amounts recognized in the consolidated balance sheets:
Other long-term assets, net	0	0
Accrued liabilities	(442)	(352)
Other long-term liabilities	(15,828)	(14,328)
Net pension asset (liability)	(16,270)	(14,680)
Accumulated benefit obligation for the Pension Plans	$ 16,270	$ 14,680

EMPLOYEE BENEFIT PLANS Narrative 2 (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.10%	2.84%	3.34%
Fair value of plan assets	$ 189,838	$ 182,727	$ 159,036
Accumulated benefit obligation for the Pension Plans	171,899	181,263
Excess Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Accumulated benefit obligation for the Pension Plans	4,300	3,800
Projected benefit obligation for the Pension Plans	$ 5,000	$ 3,800

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References + Details

EMPLOYEE BENEFIT PLANS Table 2 - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assumptions used in calculations description	We amortize prior service costs and credits on a straight-line basis over the average remaining service period of employees expected to receive benefits under our Pension Plans and other postretirement benefit plans (“Amortization of prior service credit” in table above). We amortize the actuarial gains and losses that exceed 10% of the greater of the projected benefit obligation or market-related value of plan assets (smoothed asset value) over the average remaining service period of active employees expected to receive benefits under our Pension Plans and other postretirement benefit plans (“Amortization of net actuarial loss” in table above).
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9,978	$ 9,174	$ 9,549
Interest cost	4,084	4,693	5,480
Expected return on plan assets	(9,233)	(8,972)	(8,015)
Amortization of prior service credit	(2,057)	(2,057)	(2,057)
Amortization of net actuarial loss	2,279	1,845	846
Other	(561)	136	0
Net periodic benefit cost (income)	4,490	4,819	5,803
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	593	529	431
Interest cost	326	399	453
Expected return on plan assets	0	0	0
Amortization of prior service credit	(1,145)	(1,145)	(1,145)
Amortization of net actuarial loss	176	137	42
Other	0	0	0
Net periodic benefit cost (income)	$ (50)	$ (80)	$ (219)

EMPLOYEE BENEFIT PLANS Table 3 - Adjustments to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Income tax (expense) benefit	$ (61)	$ 28	$ 14
Total changes in other comprehensive income (loss)	16,413	(4,144)	(1,314)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	18,666	(2,159)	2,545
Amortization of prior service credit	(2,057)	(2,057)	(2,057)
Amortization of net actuarial loss	2,279	1,845	846
Other	(561)	0	0
Net gain reclassified into income	(339)	(212)	(1,211)
Income tax (expense) benefit	(61)	28	14
Total changes in other comprehensive income (loss)	18,266	(2,343)	1,348
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(884)	(793)	(1,559)
Amortization of prior service credit	(1,145)	(1,145)	(1,145)
Amortization of net actuarial loss	176	137	42
Other	0	0	0
Net gain reclassified into income	(969)	(1,008)	(1,103)
Income tax (expense) benefit	0	0	0
Total changes in other comprehensive income (loss)	$ (1,853)	$ (1,801)	$ (2,662)

EMPLOYEE BENEFIT PLANS Table 4 - Amounts Recorded as a Component of Accumulated Other Comprehensive (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial loss	$ (3,748)	$ (24,878)
Prior service credit	7,630	10,433
Deferred tax asset (liability)	57	118
Accumulated other comprehensive income (loss), net of tax	3,939	(14,327)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial loss	(4,554)	(3,846)
Prior service credit	4,884	6,029
Deferred tax asset (liability)	0	0
Accumulated other comprehensive income (loss), net of tax	$ 330	$ 2,183

EMPLOYEE BENEFIT PLANS Narrative 3 (Details)	12 Months Ended
EMPLOYEE BENEFIT PLANS Narrative 3 (Details)	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Expected Long-term Rate-of-Return, Description	The overall expected long-term rate of return on plan assets for the Pension Plan is estimated using various models of asset returns. Model assumptions are derived using historical data with the assumption that capital markets are informationally efficient. Three models are used to derive the long-term expected returns for each asset class. Since each method has distinct advantages and disadvantages and differing results, an equal weighted average of the methods’ results is used.
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations	65.00%
Fixed income investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations	35.00%

EMPLOYEE BENEFIT PLANS Table 5 - Major Classes of Plan Assets Measured at Fair Value (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 189,838	$ 182,727	$ 159,036
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	79,166	77,870
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	110,672	104,857
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash equivalent securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	710	2,125
Cash equivalent securities [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	710	2,125
Cash equivalent securities [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash equivalent securities [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. large cap equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	110,672	104,857
U.S. large cap equity fund [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. large cap equity fund [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	110,672	104,857
U.S. large cap equity fund [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International stock index fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,708	20,732
International stock index fund [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,708	20,732
International stock index fund [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International stock index fund [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Bond market index fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	60,748	55,013
Bond market index fund [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	60,748	55,013
Bond market index fund [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Bond market index fund [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

EMPLOYEE BENEFIT PLANS Narrative 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan contributions	$ 52	$ 11,453
Estimated future employer contributions in next fiscal year	9,500
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan contributions	213	$ 237
Estimated future employer contributions in next fiscal year	$ 400

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References + Details

EMPLOYEE BENEFIT PLANS Table 6 - Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Pension Plan [Member]
Estimated Future Benefit Payments
2022	$ 10,652
2023	11,232
2024	11,212
2025	12,266
2026	12,109
2027-2031	65,477
Other Postretirement Benefit Plans [Member]
Estimated Future Benefit Payments
2022	442
2023	497
2024	531
2025	582
2026	640
2027-2031	$ 4,003

EMPLOYEE BENEFIT PLANS Table 7 - Assumptions - Benefit Obligations (Details)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.10%	2.84%	3.34%
Rate of compensation increase	3.99%	3.51%
Cash balance interest crediting rate	2.00%	2.00%
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.08%	2.83%

EMPLOYEE BENEFIT PLANS Table 8 - Assumptions - Net Periodic Benefit Cost (Income) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.84%	3.34%	4.40%
Expected long-term rate of return on plan assets	6.00%	6.50%	6.50%
Rate of compensation increase	3.51%	3.51%	3.51%
Cash balance interest crediting rate	2.00%	2.00%	2.90%
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.83%	3.43%	4.53%

EMPLOYEE BENEFIT PLANS Table 9 - Assumptions - Health Care Cost Trend Rates (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	6.84%	6.84%
Rate to which the cost trend rate was assumed to decrease (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2028	2028
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Cap on increase in the employer's cost	The cap on the increase in employer’s cost is 2.5% per year.

UNIT-BASED COMPENSATION Narrative 1 - Overview (Details) - The 2019 LTIP [Member] - shares	Dec. 31, 2021	Apr. 29, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, number of units authorized		5,000,000
Unit-based compensation, number of units available to be awarded	2,179,072

UNIT-BASED COMPENSATION Table 1 - Information for LTIP Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, outstanding (units)	2,705,203	2,441,003	1,456,296
Compensation expense	$ 20,579	$ 12,185	$ 38,035
Restricted units, domestic employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, outstanding (units)	2,520,436	2,235,125	1,223,143
Compensation expense	$ 11,892	$ 10,205	$ 9,437
Restricted units, non-employee directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, outstanding (units)	129,312	98,769	61,349
Compensation expense	$ 856	$ 631	$ 774
Restricted units, international employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, outstanding (units)	21,760	19,987	10,243
Compensation expense	$ 139	$ 58	$ 711
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, outstanding (units)	33,695	57,448	74,439	80,690
Compensation expense	$ 3,047	$ 1,291	$ 4,172
Performance units awarded and outstanding	33,695	87,122	161,561	158,326
Unit Awards[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 4,645	$ 0	$ 22,941
Performance units awarded and outstanding	0	0	0

UNIT-BASED COMPENSATION Narrative 2 - Restricted Units 1 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash payments made in connection with DERs	$ 2,396	$ 2,093	$ 2,659
Restricted units, domestic employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, vesting period	5 years
Restricted units, non-employee directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, vesting period	3 years
Restricted units, international employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, vesting period	3 years
Unit-based awards, granted (units)	10,396
Unit-based awards, vested (units)	8,344

UNIT-BASED COMPENSATION Table 2 - Restricted Unit Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, beginning balance (units)	2,441,003	1,456,296
Unit-based awards, ending balance (units)	2,705,203	2,441,003	1,456,296
Restricted units, employees and non-employee directors (NEDs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, beginning balance (units)	2,333,894	1,284,492	1,088,236
Unit-based awards, granted (units)	1,049,081	1,454,998	596,881
Unit-based awards, vested (units)	(630,888)	(374,847)	(328,386)
Unit-based awards, forfeited (units)	(102,339)	(30,749)	(72,239)
Unit-based awards, ending balance (units)	2,649,748	2,333,894	1,284,492
Weighted-average grant date fair value (per unit), period start	$ 17.70	$ 27.48	$ 29.00
Weighted-average grant date fair value (per unit), granted	16.28	12.10	26.46
Weighted-average grant date fair value (per unit), vested	20.07	28.47	30.11
Weighted-average grant date fair value (per unit), forfeited	14.28	26.75	28.05
Weighted-average grant date fair value (per unit), period end	$ 16.57	$ 17.70	$ 27.48
Restricted units, non-employee directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, beginning balance (units)	98,769	61,349
Unit-based awards, ending balance (units)	129,312	98,769	61,349
Weighted-average grant date fair value, adoption of accounting pronouncement (per unit)			$ 20.93
Unit-based awards, adoption of accounting pronouncement (units)			59,752

UNIT-BASED COMPENSATION Narrative 3 (Details) - Restricted Units 2 and Performance Units 1 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted units that vested during the period	$ 10,300	$ 4,600	$ 9,300
Units issued to satisfy award vestings, net of tax (units)	460,076	275,146	242,199
Unrecognized compensation cost	$ 42,000
Compensation cost not yet recognized, period for recognition	3 years 8 months 12 days
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted units that vested during the period	$ 800	$ 4,200	$ 2,100
Units issued to satisfy award vestings, net of tax (units)	31,366	93,440	50,054
Unit-based compensation, description of performance units	Performance awards are issued to certain of our key employees and represent either rights to receive our common units or cash upon achieving performance measures for the performance period established by the NuStar GP, LLC Compensation Committee. Achievement of the performance measures determines the rate at which the performance awards convert into our common units or cash, which ranges from zero to 200% for certain awards.
Unit-based compensation, terms of performance units	Performance awards vest in three annual increments (tranches), based upon our achievement of the performance measures set by the Compensation Committee during the performance periods that end on December 31 of each applicable year.
Unit-based compensation, requisite service period	1 year

UNIT-BASED COMPENSATION Table 3 - Summary of Performance Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based awards, beginning balance (units)	2,441,003	1,456,296
Unit-based awards, ending balance (units)	2,705,203	2,441,003	1,456,296
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance units awarded and outstanding, period start	87,122	161,561	158,326
Unit-based awards, beginning balance (units)	57,448	74,439	80,690
Performance units awarded	4,021	0	95,969
Unit-based awards, granted (units)	33,695	57,448	74,439
Performance awards, performance adjustment (units)		72,951
Unit-based awards, vested (units)	(53,427)	(147,390)	(80,690)
Performance units forfeited (units)	(4,021)		(12,044)
Performance units forfeited (units)	(4,021)		0
Performance units awarded and outstanding, period end	33,695	87,122	161,561
Unit-based awards, ending balance (units)	33,695	57,448	74,439
Weighted-average grant date fair value (per unit), period start	$ 13.21	$ 28.01	$ 23.43
Weighted-average grant date fair value (per unit), granted	15.79	13.21	28.01
Weighted-average grant date fair value (per unit), performance adjustment		28.01
Weighted-average grant date fair value (per unit), vested	13.21	28.01	23.43
Weighted-average grant date fair value (per unit), forfeited	13.21		0
Weighted-average grant date fair value (per unit), period end	$ 15.79	$ 13.21	$ 28.01
Performance target attained		198.00%
Performance cash awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance cash awards, beginning of period, amount	$ 2,167
Performance cash awards granted, amount	2,254	$ 2,167
Performance cash awards, vested, amount	(672)	0
Performance cash awards, awarded and forfeited in period, amount	(51)
Performance cash awards, end of period, amount	$ 3,698	$ 2,167
Units issued in connection with performance cash awards	26,704

UNIT-BASED COMPENSATION Narrative 4 - Performance Awards (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 27, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted units that vested during the period		$ 800	$ 4,200	$ 2,100
Units issued to satisfy award vestings, net of tax (units)		31,366	93,440	50,054
Performance cash awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units issued in connection with performance cash awards		26,704
Performance cash awards and performance unit awards \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units issued in connection with performance cash awards	114,618

UNIT-BASED COMPENSATION Table 4 - Unit Awards (Details) - Share-based Payment Arrangement [Member] - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	12 Months Ended
	Feb. 28, 2022	Mar. 31, 2020	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, description of performance units			Unit awards are equity-classified awards of fully vested common units. We accrued compensation expense in 2021 and 2019 that was paid in unit awards in the first quarters of the respective subsequent years. We base the number of unit awards granted on the fair value of the common units at the grant date.
Weighted-average grant date fair value, granted		$ 22,941
Unit-based awards, granted (units)		834,224
Common Limited Partner [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of units (units)		571,735
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value, granted	$ 4,645
Unit-based awards, granted (units)	280,685
Subsequent Event [Member] \| Common Limited Partner [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of units (units)	186,190

INCOME TAXES Table 1 - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
U.S.	$ 3,755	$ 36	$ 3,741
Foreign	221	2,415	1,489
Foreign withholding tax	1,281	0	101
Total current	5,257	2,451	5,331
Deferred:
U.S.	(93)	300	(490)
Foreign	(531)	(621)	(168)
Foreign withholding tax	(745)	533	182
Total deferred	(1,369)	212	(476)
Less: amounts reported in discontinued operations	0	0	101
Income tax expense	$ 3,888	$ 2,663	$ 4,754

INCOME TAXES Table 2 - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Net operating losses	$ 20,005	$ 18,459
Employee benefits	83	134
Environmental and legal reserves	47	105
Capital loss	3,735	10,813
Other	495	834
Total deferred income tax assets	24,365	30,345
Less: Valuation allowance	(23,718)	(28,211)
Net deferred income tax assets	647	2,134
Deferred income tax liabilities:
Property, plant and equipment	(11,884)	(13,772)
Foreign withholding tax	(272)	(1,002)
Other	(322)	(371)
Total deferred income tax liabilities	(12,478)	(15,145)
Net deferred income tax liability	(11,831)	(13,011)
Reported on the Consolidated Balance Sheets as:
Deferred income tax liability	$ (11,831)	$ (13,011)

INCOME TAXES Narrative 1 - Operating Loss Carryforwards - Valuation Allowarnces (Details) $ in Millions	Dec. 31, 2021 USD ($)
U.S. [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 63.4
U.S. [Member] \| After December 31, 2017
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	9.4
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 6.9

INCOME TAXES Narrative 2 - Capital Loss Carryforwards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Capital Loss Carryforwards [Line Items]
Capital loss carryforward, increase (decrease)	$ (33,800)
U.S. [Member]
Capital Loss Carryforwards [Line Items]
Capital loss carryforward, subject to limitations	$ 17,700

INCOME TAXES Narrative 3 - Valuation Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 23,718	$ 28,211
U.S. [Member]
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	(4,900)
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	$ 400

SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues	$ 1,618,500	$ 1,481,564	$ 1,498,021
Depreciation, Depletion and Amortization [Abstract]
Other depreciation and amortization expense	7,792	8,625	8,360
Total depreciation and amortization expense	274,380	285,101	272,924
Operating income (loss):
General and administrative expenses	113,207	102,716	107,855
Other depreciation and amortization expense	7,792	8,625	8,360
Operating income (loss)	236,454	209,102	390,916
Pipeline Segment
Revenues:
Revenues	762,238	718,823	701,830
Storage Segment
Revenues:
Revenues	427,668	494,442	454,001
Fuels Marketing Segment
Revenues:
Revenues	428,608	268,345	342,215
Operating Segments [Member]
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization expense	266,588	276,476	264,564
Operating income (loss):
Operating income (loss)	357,453	320,443	507,131
Operating Segments [Member] \| Pipeline Segment
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization expense	179,088	177,384	166,991
Operating income (loss):
Operating income (loss)	321,472	118,429	332,480
Operating Segments [Member] \| Storage Segment
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization expense	87,500	99,092	97,573
Operating income (loss):
Operating income (loss)	24,800	189,781	154,105
Operating Segments [Member] \| Fuels Marketing Segment
Operating income (loss):
Operating income (loss)	11,181	12,233	20,578
Intersegment Eliminations [Member]
Revenues:
Revenues	(14)	(46)	(25)
Operating income (loss):
Operating income (loss)	0	0	(32)
Corporate, Non-Segment [Member]
Depreciation, Depletion and Amortization [Abstract]
Other depreciation and amortization expense	7,792	8,625	8,360
Operating income (loss):
General and administrative expenses	113,207	102,716	107,855
Other depreciation and amortization expense	$ 7,792	$ 8,625	$ 8,360

SEGMENT INFORMATION Table 2 - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues By Geographic Areas
Revenues	$ 1,618,500	$ 1,481,564	$ 1,498,021
United States
Revenues By Geographic Areas
Revenues	1,582,672	1,441,892	1,465,135
Foreign
Revenues By Geographic Areas
Revenues	$ 35,828	$ 39,672	$ 32,886

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

SEGMENT INFORMATION Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Revenues	$ 1,618,500	$ 1,481,564	$ 1,498,021
Percentage of consolidated revenues relating to single customers, description	For the years ended December 31, 2021, 2020 and 2019, Valero Energy Corporation accounted for approximately 19%, or $308.5 million, 20%, or $295.1 million, and 21%, or $307.2 million, of our revenues, respectively. These revenues were included in all of our reportable business segments. No other single customer accounted for 10% or more of our consolidated revenues.
Revenue Benchmark [Member] \| Valero Energy Corporation [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 308,500	$ 295,100	$ 307,200
Revenue Benchmark [Member] \| Valero Energy Corporation [Member] \| Customer Concentration Risk
Revenue, Major Customer [Line Items]
Largest customer percentage of revenue	19.00%	20.00%	21.00%

- Definition

+ References

+ Details

SEGMENT INFORMATION Table 3 - Property, Plant, and Equipment, Net, by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Long-Lived Assets By Geographic Areas
Long-lived assets	$ 3,541,642	$ 3,957,512
United States
Long-Lived Assets By Geographic Areas
Long-lived assets	3,428,441	3,837,550
Foreign
Long-Lived Assets By Geographic Areas
Long-lived assets	$ 113,201	$ 119,962

SEGMENT INFORMATION Table 4 - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Segment Information
Total consolidated assets	$ 5,156,332	$ 5,817,018
Operating Segments [Member]
Segment Information
Total consolidated assets	5,019,871	5,538,642
Operating Segments [Member] \| Pipeline Segment
Segment Information
Total consolidated assets	3,441,272	3,609,508
Operating Segments [Member] \| Storage Segment
Segment Information
Total consolidated assets	1,537,037	1,897,167
Operating Segments [Member] \| Fuels Marketing Segment
Segment Information
Total consolidated assets	41,562	31,967
Corporate, Non-Segment [Member]
Segment Information
Total consolidated assets	$ 136,461	$ 278,376

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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+ Details

SEGMENT INFORMATION Table 5 - Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Information
Capital expenditures	$ 181,133	$ 198,079	$ 533,568
Corporate, Non-Segment [Member]
Segment Information
Capital expenditures	1,750	3,779	3,894
Pipeline Segment
Segment Information
Capital expenditures	67,340	122,512	387,702
Storage Segment
Segment Information
Capital expenditures	$ 112,043	$ 71,788	141,972
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Segment Information
Capital expenditures, discontinued operations			$ 27,954

SUBSEQUENT EVENT (Details) $ in Thousands, bbl in Millions				12 Months Ended
SUBSEQUENT EVENT (Details) $ in Thousands, bbl in Millions	Feb. 11, 2022 USD ($) bbl	Dec. 07, 2020 USD ($)	Jul. 29, 2019 USD ($)	Dec. 31, 2020 USD ($)	Oct. 08, 2021 bbl
Subsequent Event [Line Items]
Proceeds from expected sale of business		$ 106,000	$ 230,000
Loss on expected sale				$ (34,700)
Storage Segment
Subsequent Event [Line Items]
Storage capacity expected to be sold \| bbl					14.8
Forecast
Subsequent Event [Line Items]
Proceeds from expected sale of business	$ 60,000
Forecast \| Minimum [Member]
Subsequent Event [Line Items]
Loss on expected sale	(40,000)
Forecast \| Maximum [Member]
Subsequent Event [Line Items]
Loss on expected sale	$ (50,000)
Forecast \| Storage Segment
Subsequent Event [Line Items]
Storage capacity expected to be sold \| bbl	7.8