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DEI Document - shares	3 Months Ended
DEI Document - shares	Mar. 31, 2016	Apr. 30, 2016
Document Information [Abstract]
Entity Registrant Name	NuStar Energy L.P.
Entity Central Index Key	0001110805
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Trading Symbol	ns
Amendment Flag	false
Entity Partnership Units Outstanding		77,886,078

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 130,917	$ 118,862
Accounts receivable, net of allowance for doubtful accounts of $7,978 and $8,473 as of March 31, 2016 and December 31, 2015, respectively	133,469	145,064
Receivable from related party	2,295	0
Inventories	41,173	38,749
Other current assets	25,719	31,176
Total current assets	333,573	333,851
Property, plant and equipment, at cost	5,264,120	5,209,160
Accumulated depreciation and amortization	(1,577,433)	(1,525,589)
Property, plant and equipment, net	3,686,687	3,683,571
Intangible assets, net	108,551	112,011
Goodwill	696,637	696,637
Deferred income tax asset	502	2,858
Other long-term assets, net	269,599	296,597
Total assets	5,095,549	5,125,525
Current liabilities:
Accounts payable	100,782	125,147
Payable to related party	0	14,799
Short-term debt	81,000	84,000
Accrued interest payable	27,897	34,286
Accrued liabilities	43,355	55,194
Taxes other than income tax	13,599	12,810
Income tax payable	6,157	5,977
Total current liabilities	272,790	332,213
Long-term debt	3,125,650	3,055,612
Long-term payable to related party	0	32,080
Deferred income tax liability	25,841	24,810
Other long-term liabilities	113,616	70,966
Commitments and contingencies (Note 4)
Partners' equity:
Limited partners (77,886,078 common units outstanding as of March 31, 2016 and December 31, 2015)	1,625,515	1,661,900
General partner	35,709	36,738
Accumulated other comprehensive loss	(103,572)	(88,794)
Total partners' equity	1,557,652	1,609,844
Total liabilities and partners' equity	$ 5,095,549	$ 5,125,525

Consolidated Balance Sheets Non-Printing - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts	$ 7,978	$ 8,473
Limited partners common units outstanding (in units)	77,886,078	77,886,078

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Service revenues	$ 266,566	$ 269,973
Product sales	139,137	284,971
Total revenues	405,703	554,944
Costs and expenses:
Cost of product sales	128,990	262,506
Operating expenses:
Third parties	83,540	84,360
Related party	21,681	31,287
Total operating expenses	105,221	115,647
General and administrative expenses:
Third parties	13,365	7,667
Related party	10,420	17,386
Total general and administrative expenses	23,785	25,053
Depreciation and amortization expense	53,142	52,457
Total costs and expenses	311,138	455,663
Operating income	94,565	99,281
Interest expense, net	(34,123)	(32,037)
Other (expense) income, net	(171)	62,268
Income from continuing operations before income tax expense	60,271	129,512
Income tax expense	2,870	2,387
Income from continuing operations	57,401	127,125
Income from discontinued operations, net of tax	0	774
Net income	$ 57,401	$ 127,899
Basic and diluted net income per unit applicable to limited partners:
Continuing operations	$ 0.57	$ 1.46
Discontinued operations	0.00	0.01
Total (Note 11)	$ 0.57	$ 1.47
Basic weighted-average limited partner units outstanding	77,886,078	77,886,078
Diluted weighted-average limited partner units outstanding	77,956,824	77,886,078
Comprehensive income	$ 42,623	$ 107,798

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Non-Printing - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Diluted net income per unit applicable to limited partners
Continuing operations	$ 0.57	$ 1.46
Discontinued operations	0.00	0.01
Total (Note 11)	$ 0.57	$ 1.47

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities:
Net income	$ 57,401	$ 127,899
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	53,142	52,457
Unit-based compensation expense	1,086	0
Amortization of debt related items	2,017	2,237
Loss (gain) from sale or disposition of assets	4	(75)
Gain associated with the Linden Acquisition	0	(56,277)
Deferred income tax expense (benefit)	456	(535)
Distributions of equity in earnings of joint venture	0	2,500
Changes in current assets and current liabilities (Note 12)	(12,490)	(7,774)
Other, net	111	2,150
Net cash provided by operating activities	101,727	122,582
Cash Flows from Investing Activities:
Capital expenditures	(46,176)	(72,880)
Change in accounts payable related to capital expenditures	(12,663)	(13,464)
Acquisitions	0	(142,500)
Investment in other long-term assets	0	(2,177)
Proceeds from sale or disposition of assets	0	1,185
Net cash used in investing activities	(58,839)	(229,836)
Cash Flows from Financing Activities:
Proceeds from long-term debt borrowings	168,089	330,532
Proceeds from short-term debt borrowings	134,000	163,000
Long-term debt repayments	(93,709)	(83,166)
Short-term debt repayments	(137,000)	(194,000)
Distributions to unitholders and general partner	(98,051)	(98,051)
Decrease in cash book overdrafts	(8,799)	(14,294)
Other, net	(5)	(10)
Net cash (used in) provided by financing activities	(35,475)	104,011
Effect of foreign exchange rate changes on cash	4,642	(6,486)
Net increase (decrease) in cash and cash equivalents	12,055	(9,729)
Cash and cash equivalents as of the beginning of the period	118,862	87,912
Cash and cash equivalents as of the end of the period	$ 130,917	$ 78,183

ORGANIZATION AND BASIS OF PRESENTATION	3 Months Ended
ORGANIZATION AND BASIS OF PRESENTATION	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION AND BASIS OF PRESENTATION	ORGANIZATION AND BASIS OF PRESENTATION Organization and Operations NuStar Energy L.P. (NYSE: NS) is a publicly held Delaware limited partnership engaged in the transportation of petroleum products and anhydrous ammonia, the terminalling and storage of petroleum products and the marketing of petroleum products. 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. NuStar GP Holdings, LLC (NuStar GP Holdings or NSH) (NYSE: NSH) owns our general partner, Riverwalk Logistics, L.P., and owns an approximate 15% total interest in us as of March 31, 2016. 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. Recent Developments Employee Transfer from NuStar GP, LLC. On March 1, 2016, NuStar GP, LLC, the general partner of our general partner and a wholly owned subsidiary of NuStar GP Holdings, transferred and assigned to NuStar Services Company LLC (NuStar Services Co), a wholly owned subsidiary of NuStar Energy, all of NuStar GP, LLC’s employees and related benefit plans, programs, contracts and policies (the Employee Transfer). As a result of the Employee Transfer, we pay employee costs directly and sponsor the long-term incentive plan and other employee benefit plans. Please refer to Note 7 for a discussion of this transfer and our related party agreements, Note 8 for a discussion of our employee benefit plans and Note 9 for a discussion of our long-term incentive plan. Linden Acquisition. On January 2, 2015, we acquired full ownership of ST Linden Terminal, LLC (Linden), which owns a refined products terminal in Linden, NJ with 4.3 million barrels of storage capacity (the Linden Acquisition). Prior to the Linden Acquisition, Linden operated as a joint venture between us and Linden Holding Corp., with each party owning 50%. On the acquisition date, we remeasured our existing 50% equity investment in Linden to its fair value of $128.0 million and we recognized a gain of $56.3 million in “Other (expense) income, net” in the condensed consolidated statements of comprehensive income for the three months ended March 31, 2015. Basis of Presentation These unaudited condensed consolidated financial statements include the accounts of the Partnership and subsidiaries in which the Partnership has a controlling interest. Noncontrolling interests are separately disclosed on the financial statements. Inter-partnership balances and transactions have been eliminated in consolidation. We account for investment in joint ventures using the equity method of accounting. These unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, they do not include all of the information and notes required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included, and all disclosures are adequate. All such adjustments are of a normal recurring nature unless disclosed otherwise. Financial information for the three months ended March 31, 2016 and 2015 included in these Condensed Notes to Consolidated Financial Statements is derived from our unaudited condensed consolidated financial statements. Operating results for the three months ended March 31, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016. The consolidated balance sheet as of December 31, 2015 has been derived from the audited consolidated financial statements as of that date. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015. Certain previously reported amounts in the 2015 consolidated financial statements and condensed notes have been reclassified to conform to 2016 presentation.

NEW ACCOUNTING PRONCOUNCEMENTS Notes	3 Months Ended
NEW ACCOUNTING PRONCOUNCEMENTS Notes	Mar. 31, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTS Unit-Based Payments In March 2016, the Financial Accounting Standards Board (FASB) issued amended guidance that simplifies certain aspects of accounting for unit-based payments to employees, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The changes are effective for annual and interim periods beginning after December 15, 2016, and early adoption is permitted. Prior to the Employee Transfer discussed in Note 1 above, we did not sponsor a unit-based compensation plan. Upon completion of the Employee Transfer, we adopted this amended guidance effective January 1, 2016 on a prospective basis, which did not have a material impact on our financial position, results of operations or disclosures. Please refer to Note 9 for a discussion of our long-term incentive plan. Leases In February 2016, the FASB issued amended guidance that requires lessees to recognize the assets and liabilities that arise from most leases on the balance sheet. For lessors, this amended guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. The changes are effective for annual and interim periods beginning after December 15, 2018, and amendments should be applied using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements, with the option to use certain expedients. We are currently assessing the impact of this amended guidance on our financial position, results of operations and disclosures. Financial Instruments In January 2016, the FASB issued new guidance that addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. The changes are effective for annual and interim periods beginning after December 15, 2017, and amendments should be applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. We will adopt these provisions January 1, 2018, and we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures. Inventory In July 2015, the FASB issued amended guidance that requires inventory to be measured at the lower of cost or net realizable value. The changes are effective for annual and interim periods beginning after December 15, 2016, and must be applied prospectively after the date of adoption. We will adopt these provisions January 1, 2017, and we do not expect the amended guidance to have a material impact on our financial position, results of operations or disclosures. Debt Issuance Costs In April 2015, the FASB issued amended guidance for the presentation of debt issuance costs. Under the amended guidance, debt issuance costs will be presented on the balance sheet as a deduction from the carrying value of the associated debt liability. In August 2015, the FASB issued amended guidance that would allow debt issuance costs related to line-of-credit agreements to continue to be presented as an asset on the balance sheet. The changes are effective for annual and interim periods beginning after December 15, 2015, and retrospective application is required. On January 1, 2016, we retrospectively adopted this guidance. As a result, we reclassified $23.7 million of deferred debt issuance costs from “Other long-term assets, net” to “Long-term debt” on the consolidated balance sheet as of December 31, 2015. Revenue Recognition In May 2014, the FASB and the International Accounting Standards Board jointly issued a comprehensive new revenue recognition standard. In August 2015, the FASB deferred the effective date by one year. The standard is now effective for public entities for annual and interim periods beginning after December 15, 2017, using one of two retrospective transition methods. Early adoption is permitted, but not before the original effective date. In March 2016, the FASB issued final amendments to clarify the principal versus agent guidance within this comprehensive new revenue recognition standard. In April 2016, the FASB issued final amendments to clarify when a promised good or service is distinct within the context of a contract. We are currently assessing the impact of this new guidance on our financial position, results of operations and disclosures, and we have not yet selected a transition method.

- Definition

Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6523989

+ Details

DEBT	3 Months Ended
DEBT	Mar. 31, 2016
Debt Disclosure [Abstract]
DEBT	DEBT Revolving Credit Agreement During the three months ended March 31, 2016, the balance under our $1.5 billion five-year revolving credit agreement (the Revolving Credit Agreement) increased by $75.6 million, which we used for general partnership purposes and to fund our capital expenditures. The Revolving Credit Agreement matures on October 29, 2019 and bears interest, at our option, based on an alternative base rate, a LIBOR-based rate or a EURIBOR-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. As of March 31, 2016, our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 2.2% and we had $958.3 million outstanding. As of March 31, 2016, our consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) could not exceed 5.00-to-1.00. The requirement not to exceed a maximum consolidated debt coverage ratio may limit the amount we can borrow under the Revolving Credit Agreement to an amount less than the total amount available for borrowing. As of March 31, 2016, our consolidated debt coverage ratio was 4.6x, and we had $523.2 million available for borrowing. Letters of credit issued under the Revolving Credit Agreement totaled $18.5 million as of March 31, 2016. Gulf Opportunity Zone Revenue Bonds In 2008, 2010 and 2011, the Parish of St. James, Louisiana issued, pursuant to the Gulf Opportunity Zone Act of 2005, tax-exempt revenue bonds (the GoZone Bonds) associated with our St. James, Louisiana terminal expansions. The GoZone Bonds bear interest based on a weekly tax-exempt bond market interest rate, and interest is paid monthly. The weighted-average interest rate was 0.4% as of March 31, 2016. Following the issuances, the proceeds were deposited with a trustee and are disbursed to us upon our request for reimbursement of expenditures related to our St. James terminal expansions. We include the amount remaining in trust in “Other long-term assets, net,” and we include the amount of bonds issued in “Long-term debt” on the consolidated balance sheets. For the three months ended March 31, 2016 and 2015, the amount received from the trustee totaled $5.5 million and $0.5 million, respectively. As of March 31, 2016, the amount remaining in trust totaled $49.3 million. 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 $125.0 million receivables financing agreement with third-party lenders (the Receivables Financing Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (collectively with the Receivables Financing Agreement, the Securitization Program). NuStar Finance’s sole business consists of purchasing receivables from certain of NuStar Energy’s wholly owned subsidiaries and providing these receivables 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, its subsidiaries selling receivables under the Securitization Program or their affiliates. The amount available for borrowing is based on the availability of eligible receivables and other customary factors and conditions. Borrowings by NuStar Finance under the Receivables Financing Agreement bear interest at either the applicable commercial paper rate or the applicable bank rate, each as defined under the Receivables Financing Agreement. The Securitization Program has an initial termination date of June 15, 2018, with the option to renew for additional 364-day periods thereafter. As of March 31, 2016, $81.3 million of our accounts receivable are included in the Securitization Program. The amount of borrowings outstanding under the Receivables Financing Agreement totaled $48.5 million as of March 31, 2016, which is included in “Long-term debt” on the consolidated balance sheet.

COMMITMENTS AND CONTINGENCIES	3 Months Ended
COMMITMENTS AND CONTINGENCIES	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES 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. As of March 31, 2016, we have accrued $4.4 million for contingent losses. The amount that will ultimately be paid may differ from the recorded accruals, and the timing of such payments is uncertain. In addition, due to the inherent uncertainty of litigation, there can be no assurance that the resolution of any particular claim or proceeding would not have a material adverse effect on our results of operations, financial position or liquidity.

FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

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.

Recurring Fair Value Measurements

The following assets and liabilities are measured at fair value on a recurring basis:



	March 31, 2016
	Level 1			Level 2			Level 3			Total
	(Thousands of Dollars)
Assets:
Other current assets:
Product imbalances	$	4,321		$	—		$	—		$	4,321
Commodity derivatives	1,671			69			—			1,740
Total	$	5,992		$	69		$	—		$	6,061
Liabilities:
Accrued liabilities:
Product imbalances	$	(433	)	$	—		$	—		$	(433	)
Commodity derivatives	(751		)	(133		)	—			(884		)
Other long-term liabilities:
Guarantee liability	—			—			(1,400		)	(1,400		)
Interest rate swaps	—			(28,675		)	—			(28,675		)
Total	$	(1,184	)	$	(28,808	)	$	(1,400	)	$	(31,392	)



	December 31, 2015
	Level 1			Level 2			Level 3			Total
	(Thousands of Dollars)
Assets:
Other current assets:
Product imbalances	$	179		$	—		$	—		$	179
Commodity derivatives	11,325			77			—			11,402
Other long-term assets, net:
Interest rate swaps	—			2,755			—			2,755
Total	$	11,504		$	2,832		$	—		$	14,336
Liabilities:
Accrued liabilities:
Product imbalances	$	(419	)	$	—		$	—		$	(419	)
Commodity derivatives	—			(120		)	—			(120		)
Other long-term liabilities:
Guarantee liability	—			—			(1,697		)	(1,697		)
Interest rate swaps	—			(1,452		)	—			(1,452		)
Total	$	(419	)	$	(1,572	)	$	(1,697	)	$	(3,688	)

Product Imbalances. We value our assets and liabilities related to product imbalances using quoted market prices in active markets as of the reporting date. Therefore, we include these product imbalances in Level 1 of the fair value hierarchy.

Commodity Derivatives. We base the fair value of certain of our commodity derivative instruments on quoted prices on an exchange; accordingly, we include these items in Level 1 of the fair value hierarchy. We also have derivative instruments for which we determine fair value using industry pricing services and other observable inputs, such as quoted prices on an exchange for similar derivative instruments. Therefore, we include these derivative instruments in Level 2 of the fair value hierarchy. See Note 6 for a discussion of our derivative instruments.

Interest Rate Swaps. We estimate the fair value of our forward-starting interest rate swaps using discounted cash flows, which use observable inputs such as time to maturity and market interest rates. Therefore, we include these interest rate swaps in Level 2 of the fair value hierarchy.

Guarantees. In 2014, we sold our remaining 50% ownership interest in NuStar Asphalt LLC, which then changed its name to Axeon Specialty Products LLC (Axeon). We provide credit support, such as guarantees, letters of credit and cash collateral, as applicable, of up to $125.0 million to Axeon. As of March 31, 2016, we have provided $19.7 million in letters of credit on behalf of Axeon. As of March 31, 2016 and December 31, 2015, we provided guarantees mainly for commodity purchases, lease obligations and certain utilities for Axeon with an aggregate maximum potential exposure of $59.3 million and $71.9 million, respectively, and one guarantee that does not specify a maximum amount. A majority of these guarantees have no expiration date. We estimated the fair value considering the probability of default by Axeon and an estimate of the amount we would be obligated to pay under the guarantees at the time of default based on the guarantees outstanding as of March 31, 2016 and December 31, 2015. Our estimate of the fair value is based on significant inputs not observable in the market and thus falls within Level 3 of the fair value hierarchy.

The following table summarizes the activity in our Level 3 liabilities:



	Three Months Ended March 31, 2016
	(Thousands of Dollars)
Beginning balance	$	1,697
Adjustments to guarantee liability	(297		)
Ending balance	$	1,400

Fair Value of Financial Instruments

We recognize cash equivalents, receivables, note receivables, payables and debt in our consolidated balance sheets at their carrying amounts. The fair values of these financial instruments, except for the $190.0 million term loan to Axeon (the Axeon Term Loan) and long-term debt, approximate their carrying amounts.

The estimated fair values and carrying amounts of the long-term debt and the Axeon Term Loan were as follows:



	March 31, 2016				December 31, 2015
	Fair Value		Carrying Amount		Fair Value		Carrying Amount
	(Thousands of Dollars)
Long-term debt	$	2,980,166	$	3,125,650	$	2,929,438	$	3,055,612
Axeon Term Loan	$	173,197	$	170,055	$	172,123	$	170,352

We estimated the fair value of our publicly-traded senior notes based upon quoted prices in active markets; therefore, we determined that the fair value of our publicly-traded senior notes falls in Level 1 of the fair value hierarchy. For our other debt, for which a quoted market price is not available, we 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.

We estimated the fair value of the Axeon Term Loan using discounted cash flows, which use observable inputs such as time to maturity and market interest rates, and determined that the fair value falls in Level 2 of the fair value hierarchy. The carrying value of the Axeon Term Loan is included in “Other long-term assets, net” on the consolidated balance sheets.

As of March 31, 2016, the carrying amount of the Axeon Term Loan is $170.1 million, consisting of the following: (i) the outstanding principal amount from the Axeon Term Loan of $190.0 million; (ii) plus the fair value of guarantees of $1.4 million as of March 31, 2016; and (iii) less equity losses from our investment in Axeon of $21.3 million incurred prior to the 2014 sale of our remaining ownership interest in Axeon and after the carrying value of our equity investment in Axeon was reduced to zero. The carrying value of the Axeon Term Loan is included in “Other long-term assets, net” on the consolidated balance sheets. We review the financial information of Axeon monthly for possible credit loss indicators. In 2015 and 2014, Axeon failed to make two scheduled principal payments, increasing the interest rate payable by Axeon, until Axeon makes the payments.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES

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.

Interest Rate Risk

We are a party to certain interest rate swap agreements to manage our exposure to changes in interest rates, which include forward-starting interest rate swap agreements related to forecasted debt issuances in 2018 and 2020. We entered into these 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. Under the terms of the swaps, we pay a fixed rate and receive a rate based on three month USD LIBOR. These swaps qualified, and we designated them, as cash flow hedges. We record the effective portion of mark-to-market adjustments as a component of “Accumulated other comprehensive income” (AOCI), and the amount in AOCI will be recognized in “Interest expense, net” as the forecasted interest payments occur or if the interest payments are probable not to occur. As of March 31, 2016 and December 31, 2015, the aggregate notional amount of forward-starting interest rate swaps totaled $600.0 million.

Commodity Price Risk

We are exposed to market risks related to the volatility of crude oil and refined product prices. In order to reduce the risk of commodity price fluctuations with respect to our crude oil and finished product inventories and related firm commitments to purchase and/or sell such inventories, we utilize commodity futures and swap contracts, which qualify and we designate as fair value hedges. Derivatives that are intended to hedge our commodity price risk, but fail to qualify as fair value or cash flow hedges, are considered economic hedges, and we record associated gains and losses in net income. Our risk management committee oversees our trading controls and procedures and certain aspects of commodity and trading risk management. Our risk management committee also reviews all new commodity and trading risk management strategies in accordance with our risk management policy, as approved by our board of directors.

The volume of commodity contracts is based on open derivative positions and represents the combined volume of our long and short open positions on an absolute basis, which totaled 4.8 million barrels and 8.0 million barrels as of March 31, 2016 and December 31, 2015, respectively. As of March 31, 2016, we had $2.0 million of margin deposits and none as of December 31, 2015. The fair values of our derivative instruments included in our consolidated balance sheets were as follows:



		Asset Derivatives				Liability Derivatives
	Balance Sheet Location	March 31, 2016		December 31, 2015		March 31, 2016			December 31, 2015
		(Thousands of Dollars)
Derivatives Designated as Hedging Instruments:
Commodity contracts	Other current assets	$	—	$	1,937	$	—		$	(23	)
Interest rate swaps	Other long-term assets, net	—		2,755		—			—
Commodity contracts	Accrued liabilities	88		—		(358		)	—
Interest rate swaps	Other long-term liabilities	—		—		(28,675		)	(1,452		)
Total		88		4,692		(29,033		)	(1,475		)

Derivatives Not Designated as Hedging Instruments:
Commodity contracts	Other current assets	2,773		34,016		(1,033		)	(24,528		)
Commodity contracts	Accrued liabilities	1,135		117		(1,749		)	(237		)
Total		3,908		34,133		(2,782		)	(24,765		)

Total Derivatives		$	3,996	$	38,825	$	(31,815	)	$	(26,240	)

Certain of our derivative instruments are eligible for offset in the consolidated balance sheets and subject to master netting arrangements. Under our master netting arrangements, there is a legally enforceable right to offset amounts, and we intend to settle such amounts on a net basis. The following are the net amounts presented on the consolidated balance sheets:



Commodity Contracts	March 31, 2016			December 31, 2015
	(Thousands of Dollars)
Net amounts of assets presented in the consolidated balance sheets	$	1,740		$	11,402
Net amounts of liabilities presented in the consolidated balance sheets	$	(884	)	$	(120	)

The earnings impact of our commodity contracts, for which gains and/or losses are recognized in “Cost of product sales” on the condensed consolidated statements of comprehensive income, was as follows:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Derivatives Designated as Fair Value Hedging Instruments:
Gain (loss) recognized in income on derivative	$	(1,012	)	$	2,164
Gain (loss) recognized in income on hedged item	2,866			(1,676		)
Gain (loss) recognized in income for ineffective portion	1,854			488

Derivatives Not Designated as Hedging Instruments:
Gain (loss) recognized in income on derivative	$	720		$	330

The earnings impact of our interest rate swaps was as follows:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Derivatives Designated as Cash Flow Hedging Instruments:
Gain (loss) recognized in other comprehensive income on derivative (effective portion)	$	(29,978	)	$	(2,035	)
Gain (loss) reclassified from AOCI into interest expense, net (effective portion) (a)	$	(2,222	)	$	(2,538	)


(a)	As of March 31, 2016, we expect to reclassify a loss of $7.9 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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+ Details

RELATED PARTY TRANSACTIONS

3 Months Ended

Mar. 31, 2016

RELATED PARTY TRANSACTIONS

GP Services Agreement. Prior to the Employee Transfer, our operations were managed by NuStar GP, LLC under a services agreement effective January 1, 2008 pursuant to which employees of NuStar GP, LLC performed services for our U.S. operations. Employees of NuStar GP, LLC provided services to us and NuStar GP Holdings; therefore, we reimbursed NuStar GP, LLC for all employee costs, other than the expenses allocated to NuStar GP Holdings.

In conjunction with the Employee Transfer, we entered into an Amended and Restated Services Agreement with NuStar GP, LLC, effective March 1, 2016 (the Amended GP Services Agreement). The Amended GP Services Agreement provides that we will furnish administrative services necessary to conduct the business of NuStar GP Holdings. NuStar GP Holdings will compensate us for these services through an annual fee of $1.0 million, subject to adjustment based on the annual merit increase percentage applicable to our employees for the most recently completed fiscal year and for changes in level of service. The Amended GP Services Agreement will terminate on March 1, 2020 and will automatically renew for successive two-year terms, unless terminated by either party.

The following table summarizes information pertaining to related party transactions:



	Three Months Ended March 31,
	2016		2015
	(Thousands of Dollars)
Operating expenses	$	21,681	$	31,287
General and administrative expenses	$	10,420	$	17,386

Assignment and Assumption Agreement. Also on March 1, 2016 and in connection with the Employee Transfer, we entered into an Assignment and Assumption Agreement with NuStar GP, LLC (the Assignment Agreement). Under the Assignment Agreement, NuStar GP, LLC assigned all of its employee benefit plans, programs, contracts, policies, and various of its other agreements and contracts with certain employees, affiliates and third-party service providers (collectively, the Assigned Programs) to NuStar Services Co. In addition, NuStar Services Co agreed to assume the sponsorship and all obligations relating to the ongoing maintenance and administration of each of the plans and agreements in the Assigned Programs.

The following table summarizes the related party transactions and changes to amounts reported on our consolidated balance sheet as a result of the Employee Transfer on March 1, 2016 (thousands of dollars):



Decrease in related party payable:
Current	$	16,014
Long-term	32,656
Decrease in related party payable	$	48,670

Changes to our consolidated balance sheet:
Current and long-term assets	$	2,154
Current liabilities	5,609
Other long-term liabilities	34,042
Limited partner’s equity	2,664
Accumulated other comprehensive loss	4,201
Changes to our consolidated balance sheet	$	48,670

We had a receivable from related party of $2.3 million as of March 31, 2016, mainly representing service fees and expenses paid on behalf of NuStar GP Holdings. As of December 31, 2015, we had a payable to related party of $14.8 million, mainly representing payroll, employee benefit plan expenses and unit-based compensation prior to the Employee Transfer and none as of March 31, 2016. We also had a long-term payable to related party as of December 31, 2015 of $32.1 million, representing long-term employee benefits prior to the Employee Transfer and none as of March 31, 2016.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References + Details

EMPLOYEE BENEFIT PLANS (Notes)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

EMPLOYEE BENEFIT PLANS

Prior to the Employee Transfer, NuStar GP, LLC sponsored and maintained the defined benefit plans and defined contribution plans described below. Effective March 1, 2016, in connection with the Employee Transfer, we assumed sponsorship and responsibility for these defined benefit plans and defined contribution plans, which include both qualified and nonqualified plans. The benefits received by our employees were not impacted by the Employee Transfer.

Defined Benefit Plans

NuStar Pension Plan. 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 based on age, service and interest credits, and employees become fully vested in their benefits upon attaining three years of vesting service.

NuStar Excess Pension Plan. The NuStar Excess Pension Plan (the Excess Pension Plan) is a nonqualified deferred compensation plan that provides benefits to a select group of management or other highly compensated employees. The Excess Pension Plan is not intended to constitute either a qualified plan under the provisions of Section 401 of the Internal Revenue Code of 1986, as amended (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.

Other Postretirement Benefits. We also sponsor a contributory medical benefits plan for U.S. employees that retired prior to April 1, 2014. For employees that retire on or after April 1, 2014, we provide partial reimbursement for eligible third-party health care premiums.

We estimate pension and other postretirement benefit obligations and costs from actuarial valuations. The actuarial valuations require the use of certain assumptions, including discount rates, expected long-term rates of return on plan assets and expected rates of compensation increase. The amortization of actuarial gains and losses reflects a corridor based on 10% of the greater of the projected benefit obligation or the market-related value of the pension plan assets.

The annual measurement date for our pension and other postretirement benefit plans is December 31 and we recognize the overfunded or underfunded status of our defined benefit pension or other postretirement benefit plans as an asset or a liability as of the balance sheet dates. We record changes in the funded status of our plans as a component of comprehensive income in the year the changes occur. The reconciliation of funded status for the Pension Plans and other postretirement benefit plans as of December 31, 2015 was as follows:



	Pension Plans			Other Postretirement Benefits
	(Thousands of Dollars)
Fair value of plan assets	$	87,706		$	—
Less: Benefit obligation	109,202			10,042
Funded status	$	(21,496	)	$	(10,042	)

On March 1, 2016, and in conjunction with the Employee Transfer, we assumed $22.5 million and $10.2 million in benefit obligations associated with the Pension Plans and other postretirement benefits, respectively. Prior to the Employee Transfer, we reimbursed all costs incurred by NuStar GP, LLC related to these employee benefit plans at cost. The following table summarizes the components of net periodic benefit costs for the Pension Plans and other postretirement benefits on a combined basis for periods prior to the Employee Transfer and after the Employee Transfer:



	Pension Plans						Other Postretirement Benefits
	2016			2015			2016			2015
	(Thousands of Dollars)
For the three months ended March 31:
Service cost	$	1,926		$	1,919		$	105		$	118
Interest cost	1,006			1,097			100			112
Expected return on assets	(1,352		)	(1,254		)	—			—
Amortization of prior service credit	(517		)	(516		)	(286		)	(286		)
Amortization of net loss	273			461			45			67
Net periodic benefit cost (income)	$	1,336		$	1,707		$	(36	)	$	11

Contributions to the Pension Plans and Other Postretirement Benefits. During 2016, approximately $8.1 million and $0.3 million is expected to be contributed to the Pension Plans and other postretirement benefits, respectively, which principally represents contributions either required by regulations or laws, or with respect to unfunded plans, necessary to fund current benefits.

Defined Contribution Plans

NuStar Thrift Plan. The NuStar Thrift Plan (the Thrift Plan) is a qualified defined contribution plan and participation in the Thrift Plan is voluntary and open to substantially all our employees upon their date 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.

NuStar Excess Thrift Plan. The NuStar Excess Thrift Plan (the Excess Thrift Plan) is a nonqualified deferred compensation plan that 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. The Excess Thrift Plan is not 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.

We also sponsor several other defined contribution plans for certain international employees located in Canada, the Netherlands and the United Kingdom.

UNIT-BASED COMPENSATION (Notes)

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

UNIT-BASED COMPENSATION

Overview

On January 28, 2016, our unitholders approved the Fifth Amended and Restated 2000 Long-Term Incentive Plan (the Amended 2000 LTIP) which, among other items, provides that we may use newly issued units from NuStar Energy to satisfy unit awards and extends the term of the Amended 2000 LTIP to January 28, 2026. Prior to the Employee Transfer, NuStar GP, LLC sponsored the Amended 2000 LTIP and we reimbursed NuStar GP, LLC for awards under this plan. The approval of the Amended 2000 LTIP, coupled with the Employee Transfer, resulted in the classification of most of our currently outstanding and subsequently issued awards as equity-classified awards.

Effective March 1, 2016, we assumed sponsorship of the Amended 2000 LTIP, which provides the Compensation Committee of the Board of Directors of NuStar GP, LLC (the Compensation Committee) with the right to issue and award up to 3,250,000 of our common units to employees and non-employee directors. Awards available under the Amended 2000 LTIP include restricted units, performance units, unit options, unit awards and distribution equivalent rights (DER). The Compensation Committee may also include a tandem grant of a DER that will entitle the participant to receive cash equal to cash distributions made on any award prior to its vesting. As of March 31, 2016, common units that remained available to be awarded under the Amended 2000 LTIP totaled 1,201,757.

On March 1, 2016, we assumed all outstanding awards under the Amended 2000 LTIP, which represented 688,647 units. The transfer of the outstanding awards qualifies as a plan modification. Therefore, we measured the fair value of the outstanding awards based on the unit price on the transfer date.

Our significant unit-based compensation awards are discussed below.

Restricted Units

We account for restricted units expected to result in the issuance of our common units upon vesting as equity-classified awards. These restricted units are mainly granted to domestic employees and non-employee directors and represented 604,153 units on the Employee Transfer date. The outstanding restricted units granted to domestic employees generally vest over five years beginning one year after the grant date. The fair value of a restricted unit award for domestic employees is measured at the transfer date or the grant date. Restricted units granted to non-employee directors generally vest over three years and the fair value of such award is measured at each reporting period. DERs paid with respect to outstanding, unvested restricted units reduce equity, similar to cash distributions to unitholders. We record compensation expense ratably over the vesting period based on the fair value of the units at the grant date (for domestic employees) or the fair value of the units measured at each reporting period (for non-employee directors).

The outstanding restricted units granted to international employees are cash-settled and accounted for as liability-classified awards. These restricted units represented 49,121 units on the Employee Transfer date and vest over three to five years. We record compensation expense over the requisite service or vesting period based on the fair value of the award measured at each reporting period. The liability for restricted units granted to international employees is included in “Accrued liabilities” on our consolidated balance sheets.

Performance Units

Performance units are issued to certain of our key employees and represent rights to receive our common units upon achieving an objective performance measure for the performance period. The objective performance measure for the outstanding performance unit awards is a specific distribution coverage ratio (DCR) determined each year by the NuStar GP, LLC Compensation Committee for the following year. Our DCR determines the rate at which the performance units convert into our common units which can range from zero to 200%.

The performance units represented 35,373 units on the Employee Transfer date. Performance units vest in three annual increments (tranches), based upon our DCR during the one-year performance periods that end on December 31 of each year following the date of grant. The performance units are not considered granted until the Compensation Committee has set the DCR for each tranche of awards. Therefore, performance units are equity-classified awards measured at the grant date fair value. In addition, since the performance units granted do not receive DERs, the estimated fair value of these awards does not include the per unit distributions expected to be paid to unitholders during the vesting period. We record compensation expense ratably for each vesting tranche over its requisite service period (one-year) if it is probable that the specified DCR will be achieved. Additionally, changes in the actual or estimated outcomes that affect the quantity of performance units expected to be converted are recognized as a cumulative adjustment.

We include compensation expense for the outstanding restricted units and performance units in “General and administrative expenses” on the condensed consolidated statements of comprehensive income.

PARTNERS' EQUITY

3 Months Ended

Mar. 31, 2016

Partners' Capital Notes [Abstract]

PARTNERS' EQUITY

PARTNERS’ EQUITY

The following table summarizes changes to our partners’ equity (in thousands of dollars):



Balance as of December 31, 2015	$	1,609,844
Net income	57,401
Unit-based compensation	3,236
Other comprehensive loss	(14,778		)
Cash distributions to partners	(98,051		)
Balance as of March 31, 2016	$	1,557,652

Accumulated Other Comprehensive 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, 2016	$	(60,826	)	$	(27,968	)	$	—		$	(88,794	)
Other comprehensive income (loss):
Employee Transfer	—			—			4,201			4,201
Other comprehensive income (loss) before reclassification adjustments	8,938			(29,978		)	—			(21,040		)
Net gain on pension costs reclassified into operating expense	—			—			(120		)	(120		)
Net gain on pension costs reclassified into general and administrative expense	—			—			(41		)	(41		)
Net loss on cash flow hedges reclassified into interest expense, net	—			2,222			—			2,222
Other comprehensive income (loss)	8,938			(27,756		)	4,040			(14,778		)
Balance as of March 31, 2016	$	(51,888	)	$	(55,724	)	$	4,040		$	(103,572	)

Allocations of Net Income

General Partner. Our partnership agreement, as amended, sets forth the calculation to be used to determine the amount and priority of cash distributions that the limited partner unitholders and the general partner will receive. The partnership agreement also contains provisions for the allocation of net income and loss to the unitholders and the general partner. For purposes of maintaining partner capital accounts, the partnership agreement specifies that items of income and loss shall be allocated among the partners in accordance with their respective percentage interests. Normal allocations according to percentage interests are made after giving effect to priority income allocations, if any, in an amount equal to incentive cash distributions allocated 100% to the general partner.

The following table details the calculation of net income applicable to the general partner:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Net income applicable to general partner and limited partners’ interest	$	57,401		$	127,899
Less general partner incentive distribution	10,805			10,805
Net income after general partner incentive distribution	46,596			117,094
General partner interest	2		%	2		%
General partner allocation of net income after general partner incentive distribution	932			2,342
General partner incentive distribution	10,805			10,805
Net income applicable to general partner	$	11,737		$	13,147

Cash Distributions

The following table reflects the allocation of total cash distributions to the general and limited partners applicable to the period in which the distributions were earned:



	Three Months Ended March 31,
	2016		2015
	(Thousands of Dollars, Except Per Unit Data)
General partner interest	$	1,961	$	1,961
General partner incentive distribution	10,805		10,805
Total general partner distribution	12,766		12,766
Limited partners’ distribution	85,285		85,285
Total cash distributions	$	98,051	$	98,051

Cash distributions per unit applicable to limited partners	$	1.095	$	1.095

The following table summarizes information related to our quarterly cash distributions:



Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
March 31, 2016 (a)	$	1.095	$	98,051	May 9, 2016	May 13, 2016
December 31, 2015	$	1.095	$	98,051	February 8, 2016	February 12, 2016


(a)	The distribution was announced on April 27, 2016.

NET INCOME PER UNIT

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

NET INCOME PER UNIT

Basic and diluted net income per unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partner unitholders and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include our general partner interest, including incentive distribution rights, and restricted units awarded under our Amended 2000 LTIP.

Basic net income per unit is computed by dividing net income attributable to our limited partner unitholders by the weighted-average number of limited partner units outstanding during the period.

Diluted net income per unit is computed by dividing net income attributable to our limited partner unitholders by the sum of (i) the weighted-average number of limited partner units outstanding during the period and (ii) the effect of dilutive potential limited partner units outstanding during the period. Dilutive potential limited partner units include contingently issuable performance units under awarded our Amended 2000 LTIP.

The following table details the calculation of earnings per unit:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income attributable to NuStar Energy L.P.	$	57,401		$	127,899
Less: Distributions to general partner (including incentive distribution rights)	12,766			12,766
Less: DERs to restricted units	713			—
Less: Distributions to limited partner	85,285			85,285
Distributions (in excess of) less than earnings	$	(41,363	)	$	29,848

Net income attributable to limited parter units:
Distributions to limited partner	$	85,285		$	85,285
Allocation of distributions (in excess of) less than earnings	(40,535		)	29,251
Total	$	44,750		$	114,536

Basic weighted-average limited partner units outstanding	77,886,078			77,886,078

Diluted units outstanding:
Basic weighted-average limited partner units outstanding	77,886,078			77,886,078
Effect of dilutive participating securities	70,746			—
Diluted weighted-average limited partner units outstanding	77,956,824			77,886,078

Basic and diluted net income per unit applicable to limited partners	$	0.57		$	1.47

STATEMENTS OF CASH FLOWS

3 Months Ended

Mar. 31, 2016

Statement of Cash Flows [Abstract]

STATEMENTS OF CASH FLOWS

Changes in current assets and current liabilities were as follows:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	11,706		$	19,654
Inventories	(2,398		)	11,997
Other current assets	5,613			10,963
Increase (decrease) in current liabilities:
Accounts payable	(3,370		)	(21,776		)
Payable to related party, net	(1,575		)	1,145
Accrued interest payable	(6,389		)	(5,948		)
Accrued liabilities	(16,859		)	(23,191		)
Taxes other than income tax	593			(1,738		)
Income tax payable	189			1,120
Changes in current assets and current liabilities	$	(12,490	)	$	(7,774	)

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 and the effect of foreign currency translation. In addition, see Note 7 for non-cash related party transactions associated with the Employee Transfer.

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



	Three Months Ended March 31,
	2016		2015
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	41,079	$	38,044
Cash paid for income taxes, net of tax refunds received	$	2,742	$	1,738

SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

SEGMENT INFORMATION

Our reportable business segments consist of pipeline, storage and fuels marketing. 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. Our principal operations include the transportation of petroleum products and anhydrous ammonia, the terminalling and storage of petroleum products and the marketing of petroleum products. Intersegment revenues result from storage agreements with wholly owned subsidiaries of NuStar Energy at lease rates consistent with rates charged to third parties for storage.

Results of operations for the reportable segments were as follows:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Revenues:
Pipeline	$	118,873		$	124,425
Storage:
Third parties	146,384			144,085
Intersegment	6,015			6,249
Total storage	152,399			150,334
Fuels Marketing	140,446			286,434
Consolidation and intersegment eliminations	(6,015		)	(6,249		)
Total revenues	$	405,703		$	554,944

Operating income (loss):
Pipeline	$	64,265		$	68,640
Storage	57,013			47,978
Fuels marketing	(773		)	9,925
Consolidation and intersegment eliminations	—			43
Total segment operating income	120,505			126,586
General and administrative expenses	23,785			25,053
Other depreciation and amortization expense	2,155			2,252
Total operating income	$	94,565		$	99,281

Total assets by reportable segment were as follows:



	March 31, 2016		December 31, 2015
	(Thousands of Dollars)
Pipeline	$	1,999,202	$	2,014,098
Storage	2,471,658		2,476,389
Fuels marketing	144,921		156,866
Total segment assets	4,615,781		4,647,353
Other partnership assets	479,768		478,172
Total consolidated assets	$	5,095,549	$	5,125,525

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599

+ Details

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS

3 Months Ended

Mar. 31, 2016

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS

NuStar Energy has no operations and its assets consist mainly of its investments in NuStar Logistics and NuPOP, both wholly owned subsidiaries. The senior and subordinated notes issued by NuStar Logistics are fully and unconditionally guaranteed by NuStar Energy and NuPOP. As a result, the following condensed consolidating financial statements are presented as an alternative to providing separate financial statements for NuStar Logistics and NuPOP.

Condensed Consolidating Balance Sheets

March 31, 2016

(Thousands of Dollars)



	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	879	$	4	$	—	$	130,034	$	—		$	130,917
Receivables, net	—		727		—		135,037		—			135,764
Inventories	—		1,929		5,755		33,489		—			41,173
Other current assets	93		8,088		4,402		13,136		—			25,719
Intercompany receivable	—		1,574,862		—		—		(1,574,862		)	—
Total current assets	972		1,585,610		10,157		311,696		(1,574,862		)	333,573
Property, plant and equipment, net	—		1,919,232		568,355		1,199,100		—			3,686,687
Intangible assets, net	—		47,251		—		61,300		—			108,551
Goodwill	—		149,453		170,652		376,532		—			696,637
Investment in wholly owned subsidiaries	2,165,781		45,432		1,056,445		909,821		(4,177,479		)	—
Deferred income tax asset	—		—		—		1,681		(1,179		)	502
Other long-term assets, net	939		228,901		26,329		13,430		—			269,599
Total assets	$	2,167,692	$	3,975,879	$	1,831,938	$	2,873,560	$	(5,753,520	)	$	5,095,549
Liabilities and Partners’ Equity
Payables	$	—	$	25,923	$	7,470	$	67,389	$	—		$	100,782
Short-term debt	—		81,000		—		—		—			81,000
Accrued interest payable	—		27,874		—		23		—			27,897
Accrued liabilities	645		7,778		8,235		26,697		—			43,355
Taxes other than income tax	189		4,128		4,345		4,937		—			13,599
Income tax payable	—		1,708		12		4,437		—			6,157
Intercompany payable	505,634		—		894,589		174,639		(1,574,862		)	—
Total current liabilities	506,468		148,411		914,651		278,122		(1,574,862		)	272,790
Long-term debt	—		3,077,717		—		47,933		—			3,125,650
Deferred income tax liability	—		1,143		36		25,841		(1,179		)	25,841
Other long-term liabilities	—		48,194		7,460		57,962		—			113,616
Total partners’ equity	1,661,224		700,414		909,791		2,463,702		(4,177,479		)	1,557,652
Total liabilities and partners’ equity	$	2,167,692	$	3,975,879	$	1,831,938	$	2,873,560	$	(5,753,520	)	$	5,095,549

Condensed Consolidating Balance Sheets

December 31, 2015

(Thousands of Dollars)



	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	885	$	4	$	—	$	117,973	$	—		$	118,862
Receivables, net	—		419		—		144,645		—			145,064
Inventories	—		1,776		3,648		33,325		—			38,749
Other current assets	140		11,026		497		19,513		—			31,176
Intercompany receivable	—		1,610,370		—		—		(1,610,370		)	—
Total current assets	1,025		1,623,595		4,145		315,456		(1,610,370		)	333,851
Property, plant and equipment, net	—		1,915,370		570,415		1,197,786		—			3,683,571
Intangible assets, net	—		48,961		—		63,050		—			112,011
Goodwill	—		149,453		170,652		376,532		—			696,637
Investment in wholly owned subsidiaries	2,205,904		48,547		1,031,162		915,115		(4,200,728		)	—
Deferred income tax asset	—		—		—		4,037		(1,179		)	2,858
Other long-term assets, net	933		255,957		26,329		13,378		—			296,597
Total assets	$	2,207,862	$	4,041,883	$	1,802,703	$	2,885,354	$	(5,812,277	)	$	5,125,525
Liabilities and Partners’ Equity
Payables	$	12	$	52,650	$	11,193	$	76,091	$	—		$	139,946
Short-term debt	—		84,000		—		—		—			84,000
Accrued interest payable	—		34,271		—		15		—			34,286
Accrued liabilities	723		32,816		5,753		15,902		—			55,194
Taxes other than income tax	126		6,452		3,325		2,907		—			12,810
Income tax payable	—		1,362		9		4,606		—			5,977
Intercompany payable	508,363		—		858,018		243,989		(1,610,370		)	—
Total current liabilities	509,224		211,551		878,298		343,510		(1,610,370		)	332,213
Long-term debt	—		3,002,743		—		52,869		—			3,055,612
Long-term payable to related party	—		26,638		—		5,442		—			32,080
Deferred income tax liability	—		1,143		36		24,810		(1,179		)	24,810
Other long-term liabilities	—		37,209		9,294		24,463		—			70,966
Total partners’ equity	1,698,638		762,599		915,075		2,434,260		(4,200,728		)	1,609,844
Total liabilities and partners’ equity	$	2,207,862	$	4,041,883	$	1,802,703	$	2,885,354	$	(5,812,277	)	$	5,125,525

Condensed Consolidating Statements of Comprehensive Income

For the Three Months Ended March 31, 2016

(Thousands of Dollars)



	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	126,578		$	47,985		$	231,476		$	(336	)	$	405,703
Costs and expenses	518			68,891			31,015			211,050			(336		)	311,138
Operating (loss) income	(518		)	57,687			16,970			20,426			—			94,565
Equity in earnings (loss) of subsidiaries	57,922			(3,115		)	25,283			43,743			(123,833		)	—
Interest (expense) income, net	—			(39,632		)	1,508			8,352			(4,351		)	(34,123		)
Other income (expense), net	—			1			(17		)	(155		)	—			(171		)
Income before income tax expense	57,404			14,941			43,744			72,366			(128,184		)	60,271
Income tax expense	3			346			2			2,519			—			2,870
Net income	$	57,401		$	14,595		$	43,742		$	69,847		$	(128,184	)	$	57,401

Comprehensive income (loss)	$	57,401		$	(13,161	)	$	43,742		$	82,825		$	(128,184	)	$	42,623

Condensed Consolidating Statements of Comprehensive Income

For the Three Months Ended March 31, 2015

(Thousands of Dollars)



	NuStar Energy			NuStar Logistics			NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Revenues	$	—		$	134,036		$	52,574	$	368,661	$	(327	)	$	554,944
Costs and expenses	490			72,906			33,124		349,512		(369		)	455,663
Operating (loss) income	(490		)	61,130			19,450		19,149		42			99,281
Equity in earnings (loss) of subsidiaries	128,389			(4,164		)	81,699		101,273		(307,197		)	—
Interest (expense) income, net	—			(32,174		)	119		18		—			(32,037		)
Other income, net	—			1,340			2		60,926		—			62,268
Income from continuing operations before income tax (benefit) expense	127,899			26,132			101,270		181,366		(307,155		)	129,512
Income tax (benefit) expense	—			(1,026		)	—		3,413		—			2,387
Income from continuing operations	127,899			27,158			101,270		177,953		(307,155		)	127,125
Income from discontinued operations, net of tax	—			—			—		774		—			774
Net income	$	127,899		$	27,158		$	101,270	$	178,727	$	(307,155	)	$	127,899

Comprehensive income	$	127,899		$	27,661		$	101,270	$	158,123	$	(307,155	)	$	107,798

Condensed Consolidating Statements of Cash Flows

For the Three Months Ended March 31, 2016

(Thousands of Dollars)



	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	97,539		$	7,958		$	18,028		$	129,635		$	(151,433	)	$	101,727
Cash flows from investing activities:
Capital expenditures	—			(28,899		)	(5,442		)	(11,835		)	—			(46,176		)
Change in accounts payable related to capital expenditures	—			(7,637		)	(74		)	(4,952		)	—			(12,663		)
Net cash used in investing activities	—			(36,536		)	(5,516		)	(16,787		)	—			(58,839		)
Cash flows from financing activities:
Debt borrowings	—			296,089			—			6,000			—			302,089
Debt repayments	—			(219,709		)	—			(11,000		)	—			(230,709		)
Distributions to unitholders and general partner	(98,051		)	(49,026		)	(49,025		)	(49,031		)	147,082			(98,051		)
Net intercompany activity	507			2,998			36,513			(44,369		)	4,351			—
Other, net	(1		)	(1,774		)	—			(7,029		)	—			(8,804		)
Net cash (used in) provided by financing activities	(97,545		)	28,578			(12,512		)	(105,429		)	151,433			(35,475		)
Effect of foreign exchange rate changes on cash	—			—			—			4,642			—			4,642
Net (decrease) increase in cash and cash equivalents	(6		)	—			—			12,061			—			12,055
Cash and cash equivalents as of the beginning of the period	885			4			—			117,973			—			118,862
Cash and cash equivalents as of the end of the period	$	879		$	4		$	—		$	130,034		$	—		$	130,917

Condensed Consolidating Statements of Cash Flows

For the Three Months Ended March 31, 2015

(Thousands of Dollars)



	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	97,235		$	40,425		$	35,918		$	96,086		$	(147,082	)	$	122,582
Cash flows from investing activities:
Capital expenditures	—			(58,476		)	(4,651		)	(9,753		)	—			(72,880		)
Change in accounts payable related to capital expenditures	—			(8,554		)	(516		)	(4,394		)	—			(13,464		)
Acquisitions	—			—			—			(142,500		)	—			(142,500		)
Investment in other long-term assets	—			—			—			(2,177		)	—			(2,177		)
Proceeds from sale or disposition of assets	—			9			4			1,172			—			1,185
Net cash used in investing activities	—			(67,021		)	(5,163		)	(157,652		)	—			(229,836		)
Cash flows from financing activities:
Debt borrowings	—			493,532			—			—			—			493,532
Debt repayments	—			(277,166		)	—			—			—			(277,166		)
Distributions to unitholders and general partner	(98,051		)	(49,025		)	(49,026		)	(49,031		)	147,082			(98,051		)
Net intercompany activity	816			(134,700		)	18,271			115,613			—			—
Other, net	—			(6,045		)	—			(8,259		)	—			(14,304		)
Net cash (used in) provided by financing activities	(97,235		)	26,596			(30,755		)	58,323			147,082			104,011
Effect of foreign exchange rate changes on cash	—			—			—			(6,486		)	—			(6,486		)
Net decrease in cash and cash equivalents	—			—			—			(9,729		)	—			(9,729		)
Cash and cash equivalents as of the beginning of the period	923			6			—			86,983			—			87,912
Cash and cash equivalents as of the end of the period	$	923		$	6		$	—		$	77,254		$	—		$	78,183

FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

The following assets and liabilities are measured at fair value on a recurring basis:



	March 31, 2016
	Level 1			Level 2			Level 3			Total
	(Thousands of Dollars)
Assets:
Other current assets:
Product imbalances	$	4,321		$	—		$	—		$	4,321
Commodity derivatives	1,671			69			—			1,740
Total	$	5,992		$	69		$	—		$	6,061
Liabilities:
Accrued liabilities:
Product imbalances	$	(433	)	$	—		$	—		$	(433	)
Commodity derivatives	(751		)	(133		)	—			(884		)
Other long-term liabilities:
Guarantee liability	—			—			(1,400		)	(1,400		)
Interest rate swaps	—			(28,675		)	—			(28,675		)
Total	$	(1,184	)	$	(28,808	)	$	(1,400	)	$	(31,392	)



	December 31, 2015
	Level 1			Level 2			Level 3			Total
	(Thousands of Dollars)
Assets:
Other current assets:
Product imbalances	$	179		$	—		$	—		$	179
Commodity derivatives	11,325			77			—			11,402
Other long-term assets, net:
Interest rate swaps	—			2,755			—			2,755
Total	$	11,504		$	2,832		$	—		$	14,336
Liabilities:
Accrued liabilities:
Product imbalances	$	(419	)	$	—		$	—		$	(419	)
Commodity derivatives	—			(120		)	—			(120		)
Other long-term liabilities:
Guarantee liability	—			—			(1,697		)	(1,697		)
Interest rate swaps	—			(1,452		)	—			(1,452		)
Total	$	(419	)	$	(1,572	)	$	(1,697	)	$	(3,688	)

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following table summarizes the activity in our Level 3 liabilities:



	Three Months Ended March 31, 2016
	(Thousands of Dollars)
Beginning balance	$	1,697
Adjustments to guarantee liability	(297		)
Ending balance	$	1,400

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

The estimated fair values and carrying amounts of the long-term debt and the Axeon Term Loan were as follows:



	March 31, 2016				December 31, 2015
	Fair Value		Carrying Amount		Fair Value		Carrying Amount
	(Thousands of Dollars)
Long-term debt	$	2,980,166	$	3,125,650	$	2,929,438	$	3,055,612
Axeon Term Loan	$	173,197	$	170,055	$	172,123	$	170,352

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES (Tables)

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The fair values of our derivative instruments included in our consolidated balance sheets were as follows:



		Asset Derivatives				Liability Derivatives
	Balance Sheet Location	March 31, 2016		December 31, 2015		March 31, 2016			December 31, 2015
		(Thousands of Dollars)
Derivatives Designated as Hedging Instruments:
Commodity contracts	Other current assets	$	—	$	1,937	$	—		$	(23	)
Interest rate swaps	Other long-term assets, net	—		2,755		—			—
Commodity contracts	Accrued liabilities	88		—		(358		)	—
Interest rate swaps	Other long-term liabilities	—		—		(28,675		)	(1,452		)
Total		88		4,692		(29,033		)	(1,475		)

Derivatives Not Designated as Hedging Instruments:
Commodity contracts	Other current assets	2,773		34,016		(1,033		)	(24,528		)
Commodity contracts	Accrued liabilities	1,135		117		(1,749		)	(237		)
Total		3,908		34,133		(2,782		)	(24,765		)

Total Derivatives		$	3,996	$	38,825	$	(31,815	)	$	(26,240	)

Derivatives Assets And Liabilities Eligible for Offset Net [Table Text Block]

The following are the net amounts presented on the consolidated balance sheets:



Commodity Contracts	March 31, 2016			December 31, 2015
	(Thousands of Dollars)
Net amounts of assets presented in the consolidated balance sheets	$	1,740		$	11,402
Net amounts of liabilities presented in the consolidated balance sheets	$	(884	)	$	(120	)

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block]



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Derivatives Designated as Fair Value Hedging Instruments:
Gain (loss) recognized in income on derivative	$	(1,012	)	$	2,164
Gain (loss) recognized in income on hedged item	2,866			(1,676		)
Gain (loss) recognized in income for ineffective portion	1,854			488

Derivatives Not Designated as Hedging Instruments:
Gain (loss) recognized in income on derivative	$	720		$	330

The earnings impact of our interest rate swaps was as follows:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Derivatives Designated as Cash Flow Hedging Instruments:
Gain (loss) recognized in other comprehensive income on derivative (effective portion)	$	(29,978	)	$	(2,035	)
Gain (loss) reclassified from AOCI into interest expense, net (effective portion) (a)	$	(2,222	)	$	(2,538	)


(a)	As of March 31, 2016, we expect to reclassify a loss of $7.9 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

RELATED PARTY TRANSACTIONS (Tables)

3 Months Ended

Mar. 31, 2016

The following table summarizes information pertaining to related party transactions:



	Three Months Ended March 31,
	2016		2015
	(Thousands of Dollars)
Operating expenses	$	21,681	$	31,287
General and administrative expenses	$	10,420	$	17,386

Schedule Of Employee Transfer [Table Text Block]



Decrease in related party payable:
Current	$	16,014
Long-term	32,656
Decrease in related party payable	$	48,670

Changes to our consolidated balance sheet:
Current and long-term assets	$	2,154
Current liabilities	5,609
Other long-term liabilities	34,042
Limited partner’s equity	2,664
Accumulated other comprehensive loss	4,201
Changes to our consolidated balance sheet	$	48,670

EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The reconciliation of funded status for the Pension Plans and other postretirement benefit plans as of December 31, 2015 was as follows:



	Pension Plans			Other Postretirement Benefits
	(Thousands of Dollars)
Fair value of plan assets	$	87,706		$	—
Less: Benefit obligation	109,202			10,042
Funded status	$	(21,496	)	$	(10,042	)

Schedule of Net Benefit Costs [Table Text Block]

The following table summarizes the components of net periodic benefit costs for the Pension Plans and other postretirement benefits on a combined basis for periods prior to the Employee Transfer and after the Employee Transfer:



	Pension Plans						Other Postretirement Benefits
	2016			2015			2016			2015
	(Thousands of Dollars)
For the three months ended March 31:
Service cost	$	1,926		$	1,919		$	105		$	118
Interest cost	1,006			1,097			100			112
Expected return on assets	(1,352		)	(1,254		)	—			—
Amortization of prior service credit	(517		)	(516		)	(286		)	(286		)
Amortization of net loss	273			461			45			67
Net periodic benefit cost (income)	$	1,336		$	1,707		$	(36	)	$	11

PARTNERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2016

Partners' Capital Notes [Abstract]

Schedule of Changes in Partners' Equity

The following table summarizes changes to our partners’ equity (in thousands of dollars):



Balance as of December 31, 2015	$	1,609,844
Net income	57,401
Unit-based compensation	3,236
Other comprehensive loss	(14,778		)
Cash distributions to partners	(98,051		)
Balance as of March 31, 2016	$	1,557,652

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, 2016	$	(60,826	)	$	(27,968	)	$	—		$	(88,794	)
Other comprehensive income (loss):
Employee Transfer	—			—			4,201			4,201
Other comprehensive income (loss) before reclassification adjustments	8,938			(29,978		)	—			(21,040		)
Net gain on pension costs reclassified into operating expense	—			—			(120		)	(120		)
Net gain on pension costs reclassified into general and administrative expense	—			—			(41		)	(41		)
Net loss on cash flow hedges reclassified into interest expense, net	—			2,222			—			2,222
Other comprehensive income (loss)	8,938			(27,756		)	4,040			(14,778		)
Balance as of March 31, 2016	$	(51,888	)	$	(55,724	)	$	4,040		$	(103,572	)

Schedule of Calculation of Net Income Applicable to General Partner [Text Block]

The following table details the calculation of net income applicable to the general partner:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Net income applicable to general partner and limited partners’ interest	$	57,401		$	127,899
Less general partner incentive distribution	10,805			10,805
Net income after general partner incentive distribution	46,596			117,094
General partner interest	2		%	2		%
General partner allocation of net income after general partner incentive distribution	932			2,342
General partner incentive distribution	10,805			10,805
Net income applicable to general partner	$	11,737		$	13,147

Schedule of Distributions To General and Limited Partners [Text Block]

The following table reflects the allocation of total cash distributions to the general and limited partners applicable to the period in which the distributions were earned:



	Three Months Ended March 31,
	2016		2015
	(Thousands of Dollars, Except Per Unit Data)
General partner interest	$	1,961	$	1,961
General partner incentive distribution	10,805		10,805
Total general partner distribution	12,766		12,766
Limited partners’ distribution	85,285		85,285
Total cash distributions	$	98,051	$	98,051

Cash distributions per unit applicable to limited partners	$	1.095	$	1.095

Distributions Made to Limited and General Partners, by Distribution [Table Text Block]

The following table summarizes information related to our quarterly cash distributions:



Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
March 31, 2016 (a)	$	1.095	$	98,051	May 9, 2016	May 13, 2016
December 31, 2015	$	1.095	$	98,051	February 8, 2016	February 12, 2016


(a)	The distribution was announced on April 27, 2016.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

+ Details

NET INCOME PER UNIT (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Schedule of Net Income Per Unit

The following table details the calculation of earnings per unit:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income attributable to NuStar Energy L.P.	$	57,401		$	127,899
Less: Distributions to general partner (including incentive distribution rights)	12,766			12,766
Less: DERs to restricted units	713			—
Less: Distributions to limited partner	85,285			85,285
Distributions (in excess of) less than earnings	$	(41,363	)	$	29,848

Net income attributable to limited parter units:
Distributions to limited partner	$	85,285		$	85,285
Allocation of distributions (in excess of) less than earnings	(40,535		)	29,251
Total	$	44,750		$	114,536

Basic weighted-average limited partner units outstanding	77,886,078			77,886,078

Diluted units outstanding:
Basic weighted-average limited partner units outstanding	77,886,078			77,886,078
Effect of dilutive participating securities	70,746			—
Diluted weighted-average limited partner units outstanding	77,956,824			77,886,078

Basic and diluted net income per unit applicable to limited partners	$	0.57		$	1.47

STATEMENTS OF CASH FLOWS (Tables)

3 Months Ended

Mar. 31, 2016

Statement of Cash Flows [Abstract]

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

Changes in current assets and current liabilities were as follows:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	11,706		$	19,654
Inventories	(2,398		)	11,997
Other current assets	5,613			10,963
Increase (decrease) in current liabilities:
Accounts payable	(3,370		)	(21,776		)
Payable to related party, net	(1,575		)	1,145
Accrued interest payable	(6,389		)	(5,948		)
Accrued liabilities	(16,859		)	(23,191		)
Taxes other than income tax	593			(1,738		)
Income tax payable	189			1,120
Changes in current assets and current liabilities	$	(12,490	)	$	(7,774	)

Schedule of Supplemental Cash Flow Information [Text Block]

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



	Three Months Ended March 31,
	2016		2015
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	41,079	$	38,044
Cash paid for income taxes, net of tax refunds received	$	2,742	$	1,738

SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

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

Results of operations for the reportable segments were as follows:



	Three Months Ended March 31,
	2016			2015
	(Thousands of Dollars)
Revenues:
Pipeline	$	118,873		$	124,425
Storage:
Third parties	146,384			144,085
Intersegment	6,015			6,249
Total storage	152,399			150,334
Fuels Marketing	140,446			286,434
Consolidation and intersegment eliminations	(6,015		)	(6,249		)
Total revenues	$	405,703		$	554,944

Operating income (loss):
Pipeline	$	64,265		$	68,640
Storage	57,013			47,978
Fuels marketing	(773		)	9,925
Consolidation and intersegment eliminations	—			43
Total segment operating income	120,505			126,586
General and administrative expenses	23,785			25,053
Other depreciation and amortization expense	2,155			2,252
Total operating income	$	94,565		$	99,281

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

Total assets by reportable segment were as follows:



	March 31, 2016		December 31, 2015
	(Thousands of Dollars)
Pipeline	$	1,999,202	$	2,014,098
Storage	2,471,658		2,476,389
Fuels marketing	144,921		156,866
Total segment assets	4,615,781		4,647,353
Other partnership assets	479,768		478,172
Total consolidated assets	$	5,095,549	$	5,125,525

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Tables)

3 Months Ended

Mar. 31, 2016

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]

Condensed Consolidating Balance Sheets [Text Block]

Condensed Consolidating Balance Sheets

March 31, 2016

(Thousands of Dollars)



	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	879	$	4	$	—	$	130,034	$	—		$	130,917
Receivables, net	—		727		—		135,037		—			135,764
Inventories	—		1,929		5,755		33,489		—			41,173
Other current assets	93		8,088		4,402		13,136		—			25,719
Intercompany receivable	—		1,574,862		—		—		(1,574,862		)	—
Total current assets	972		1,585,610		10,157		311,696		(1,574,862		)	333,573
Property, plant and equipment, net	—		1,919,232		568,355		1,199,100		—			3,686,687
Intangible assets, net	—		47,251		—		61,300		—			108,551
Goodwill	—		149,453		170,652		376,532		—			696,637
Investment in wholly owned subsidiaries	2,165,781		45,432		1,056,445		909,821		(4,177,479		)	—
Deferred income tax asset	—		—		—		1,681		(1,179		)	502
Other long-term assets, net	939		228,901		26,329		13,430		—			269,599
Total assets	$	2,167,692	$	3,975,879	$	1,831,938	$	2,873,560	$	(5,753,520	)	$	5,095,549
Liabilities and Partners’ Equity
Payables	$	—	$	25,923	$	7,470	$	67,389	$	—		$	100,782
Short-term debt	—		81,000		—		—		—			81,000
Accrued interest payable	—		27,874		—		23		—			27,897
Accrued liabilities	645		7,778		8,235		26,697		—			43,355
Taxes other than income tax	189		4,128		4,345		4,937		—			13,599
Income tax payable	—		1,708		12		4,437		—			6,157
Intercompany payable	505,634		—		894,589		174,639		(1,574,862		)	—
Total current liabilities	506,468		148,411		914,651		278,122		(1,574,862		)	272,790
Long-term debt	—		3,077,717		—		47,933		—			3,125,650
Deferred income tax liability	—		1,143		36		25,841		(1,179		)	25,841
Other long-term liabilities	—		48,194		7,460		57,962		—			113,616
Total partners’ equity	1,661,224		700,414		909,791		2,463,702		(4,177,479		)	1,557,652
Total liabilities and partners’ equity	$	2,167,692	$	3,975,879	$	1,831,938	$	2,873,560	$	(5,753,520	)	$	5,095,549

Condensed Consolidating Balance Sheets

December 31, 2015

(Thousands of Dollars)



	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	885	$	4	$	—	$	117,973	$	—		$	118,862
Receivables, net	—		419		—		144,645		—			145,064
Inventories	—		1,776		3,648		33,325		—			38,749
Other current assets	140		11,026		497		19,513		—			31,176
Intercompany receivable	—		1,610,370		—		—		(1,610,370		)	—
Total current assets	1,025		1,623,595		4,145		315,456		(1,610,370		)	333,851
Property, plant and equipment, net	—		1,915,370		570,415		1,197,786		—			3,683,571
Intangible assets, net	—		48,961		—		63,050		—			112,011
Goodwill	—		149,453		170,652		376,532		—			696,637
Investment in wholly owned subsidiaries	2,205,904		48,547		1,031,162		915,115		(4,200,728		)	—
Deferred income tax asset	—		—		—		4,037		(1,179		)	2,858
Other long-term assets, net	933		255,957		26,329		13,378		—			296,597
Total assets	$	2,207,862	$	4,041,883	$	1,802,703	$	2,885,354	$	(5,812,277	)	$	5,125,525
Liabilities and Partners’ Equity
Payables	$	12	$	52,650	$	11,193	$	76,091	$	—		$	139,946
Short-term debt	—		84,000		—		—		—			84,000
Accrued interest payable	—		34,271		—		15		—			34,286
Accrued liabilities	723		32,816		5,753		15,902		—			55,194
Taxes other than income tax	126		6,452		3,325		2,907		—			12,810
Income tax payable	—		1,362		9		4,606		—			5,977
Intercompany payable	508,363		—		858,018		243,989		(1,610,370		)	—
Total current liabilities	509,224		211,551		878,298		343,510		(1,610,370		)	332,213
Long-term debt	—		3,002,743		—		52,869		—			3,055,612
Long-term payable to related party	—		26,638		—		5,442		—			32,080
Deferred income tax liability	—		1,143		36		24,810		(1,179		)	24,810
Other long-term liabilities	—		37,209		9,294		24,463		—			70,966
Total partners’ equity	1,698,638		762,599		915,075		2,434,260		(4,200,728		)	1,609,844
Total liabilities and partners’ equity	$	2,207,862	$	4,041,883	$	1,802,703	$	2,885,354	$	(5,812,277	)	$	5,125,525

Condensed Consolidating Statements of Comprehensive Income [Table Text Block]

Condensed Consolidating Statements of Comprehensive Income

For the Three Months Ended March 31, 2016

(Thousands of Dollars)



	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	126,578		$	47,985		$	231,476		$	(336	)	$	405,703
Costs and expenses	518			68,891			31,015			211,050			(336		)	311,138
Operating (loss) income	(518		)	57,687			16,970			20,426			—			94,565
Equity in earnings (loss) of subsidiaries	57,922			(3,115		)	25,283			43,743			(123,833		)	—
Interest (expense) income, net	—			(39,632		)	1,508			8,352			(4,351		)	(34,123		)
Other income (expense), net	—			1			(17		)	(155		)	—			(171		)
Income before income tax expense	57,404			14,941			43,744			72,366			(128,184		)	60,271
Income tax expense	3			346			2			2,519			—			2,870
Net income	$	57,401		$	14,595		$	43,742		$	69,847		$	(128,184	)	$	57,401

Comprehensive income (loss)	$	57,401		$	(13,161	)	$	43,742		$	82,825		$	(128,184	)	$	42,623

Condensed Consolidating Statements of Comprehensive Income

For the Three Months Ended March 31, 2015

(Thousands of Dollars)



	NuStar Energy			NuStar Logistics			NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Revenues	$	—		$	134,036		$	52,574	$	368,661	$	(327	)	$	554,944
Costs and expenses	490			72,906			33,124		349,512		(369		)	455,663
Operating (loss) income	(490		)	61,130			19,450		19,149		42			99,281
Equity in earnings (loss) of subsidiaries	128,389			(4,164		)	81,699		101,273		(307,197		)	—
Interest (expense) income, net	—			(32,174		)	119		18		—			(32,037		)
Other income, net	—			1,340			2		60,926		—			62,268
Income from continuing operations before income tax (benefit) expense	127,899			26,132			101,270		181,366		(307,155		)	129,512
Income tax (benefit) expense	—			(1,026		)	—		3,413		—			2,387
Income from continuing operations	127,899			27,158			101,270		177,953		(307,155		)	127,125
Income from discontinued operations, net of tax	—			—			—		774		—			774
Net income	$	127,899		$	27,158		$	101,270	$	178,727	$	(307,155	)	$	127,899

Comprehensive income	$	127,899		$	27,661		$	101,270	$	158,123	$	(307,155	)	$	107,798

Condensed Consolidating Statements of Cash Flows [Text Block]

Condensed Consolidating Statements of Cash Flows

For the Three Months Ended March 31, 2016

(Thousands of Dollars)



	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	97,539		$	7,958		$	18,028		$	129,635		$	(151,433	)	$	101,727
Cash flows from investing activities:
Capital expenditures	—			(28,899		)	(5,442		)	(11,835		)	—			(46,176		)
Change in accounts payable related to capital expenditures	—			(7,637		)	(74		)	(4,952		)	—			(12,663		)
Net cash used in investing activities	—			(36,536		)	(5,516		)	(16,787		)	—			(58,839		)
Cash flows from financing activities:
Debt borrowings	—			296,089			—			6,000			—			302,089
Debt repayments	—			(219,709		)	—			(11,000		)	—			(230,709		)
Distributions to unitholders and general partner	(98,051		)	(49,026		)	(49,025		)	(49,031		)	147,082			(98,051		)
Net intercompany activity	507			2,998			36,513			(44,369		)	4,351			—
Other, net	(1		)	(1,774		)	—			(7,029		)	—			(8,804		)
Net cash (used in) provided by financing activities	(97,545		)	28,578			(12,512		)	(105,429		)	151,433			(35,475		)
Effect of foreign exchange rate changes on cash	—			—			—			4,642			—			4,642
Net (decrease) increase in cash and cash equivalents	(6		)	—			—			12,061			—			12,055
Cash and cash equivalents as of the beginning of the period	885			4			—			117,973			—			118,862
Cash and cash equivalents as of the end of the period	$	879		$	4		$	—		$	130,034		$	—		$	130,917

Condensed Consolidating Statements of Cash Flows

For the Three Months Ended March 31, 2015

(Thousands of Dollars)



	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	97,235		$	40,425		$	35,918		$	96,086		$	(147,082	)	$	122,582
Cash flows from investing activities:
Capital expenditures	—			(58,476		)	(4,651		)	(9,753		)	—			(72,880		)
Change in accounts payable related to capital expenditures	—			(8,554		)	(516		)	(4,394		)	—			(13,464		)
Acquisitions	—			—			—			(142,500		)	—			(142,500		)
Investment in other long-term assets	—			—			—			(2,177		)	—			(2,177		)
Proceeds from sale or disposition of assets	—			9			4			1,172			—			1,185
Net cash used in investing activities	—			(67,021		)	(5,163		)	(157,652		)	—			(229,836		)
Cash flows from financing activities:
Debt borrowings	—			493,532			—			—			—			493,532
Debt repayments	—			(277,166		)	—			—			—			(277,166		)
Distributions to unitholders and general partner	(98,051		)	(49,025		)	(49,026		)	(49,031		)	147,082			(98,051		)
Net intercompany activity	816			(134,700		)	18,271			115,613			—			—
Other, net	—			(6,045		)	—			(8,259		)	—			(14,304		)
Net cash (used in) provided by financing activities	(97,235		)	26,596			(30,755		)	58,323			147,082			104,011
Effect of foreign exchange rate changes on cash	—			—			—			(6,486		)	—			(6,486		)
Net decrease in cash and cash equivalents	—			—			—			(9,729		)	—			(9,729		)
Cash and cash equivalents as of the beginning of the period	923			6			—			86,983			—			87,912
Cash and cash equivalents as of the end of the period	$	923		$	6		$	—		$	77,254		$	—		$	78,183

ORGANIZATION AND BASIS OF PRESENTATION Narrative (Details) $ in Thousands, bbl in Millions			3 Months Ended
	Mar. 31, 2016	Jan. 02, 2015 USD ($) bbl	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Organization and Operations [Abstract]
Total approximate ownership interest held by general partner	15.00%
Number of business segments			3
Business Acquisition [Line Items]
Gain associated with the Linden Acquisition			$ 0	$ (56,277)
Linden Acquisition [Member]
Business Acquisition [Line Items]
Acquired Storage Capacity \| bbl		4.3
Equity method investment, ownership percentage by joint venture partner		50.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage		50.00%
Acquisition date fair value of previously held equity interest		$ 128,000
Gain associated with the Linden Acquisition		$ (56,300)

NEW ACCOUNTING PRONCOUNCEMENTS Narrative (Details) $ in Millions	Dec. 31, 2015 USD ($)
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Amount of deferred debt issuance costs reclassified	$ 23.7

- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References + Details

DEBT Narrative (Details) $ in Millions	3 Months Ended
DEBT Narrative (Details) $ in Millions	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
$1.5 billion revolving credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,500.0
Term	5 years
Line of Credit Facility, Increase (Decrease), Net	$ 75.6
Interest rate at period end	2.20%
Long-term Debt	$ 958.3
Covenant terms	our consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) could not exceed 5.00-to-1.00
Debt coverage ratio	4.6
Current remaining borrowing capacity	$ 523.2
Letters of credit issued	$ 18.5
GoZone Bonds
Debt Instrument [Line Items]
Interest rate at period end	0.40%
Amount received from trustee	$ 5.5	$ 0.5
Amount remaining in trust	49.3
Receivables Financing Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	125.0
Long-term Debt	$ 48.5
Borrowing capacity, description	The amount available for borrowing is based on the availability of eligible receivables and other customary factors and conditions.
Maturity date description	The Securitization Program has an initial termination date of June 15, 2018, with the option to renew for additional 364-day periods thereafter.
Collateral amount	$ 81.3

COMMITMENTS AND CONTINGENCIES Narrative 1 (Details) $ in Millions	Mar. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	$ 4.4

FAIR VALUE MEASUREMENTS Table 1 (Details) - Recurring Fair Value Measurements - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets:
Total (assets)	$ 6,061	$ 14,336
Liabilities:
Total (liabilities)	(31,392)	(3,688)
Fair Value Level 1
Assets:
Total (assets)	5,992	11,504
Liabilities:
Total (liabilities)	(1,184)	(419)
Fair Value Level 2
Assets:
Total (assets)	69	2,832
Liabilities:
Total (liabilities)	(28,808)	(1,572)
Fair Value Level 3
Assets:
Total (assets)	0	0
Liabilities:
Total (liabilities)	(1,400)	(1,697)
Other current assets
Assets:
Product imbalances - asset	4,321	179
Commodity derivatives - assets	1,740	11,402
Other current assets \| Fair Value Level 1
Assets:
Product imbalances - asset	4,321	179
Commodity derivatives - assets	1,671	11,325
Other current assets \| Fair Value Level 2
Assets:
Product imbalances - asset	0	0
Commodity derivatives - assets	69	77
Other current assets \| Fair Value Level 3
Assets:
Product imbalances - asset	0	0
Commodity derivatives - assets	0	0
Other long-term assets, net
Assets:
Interest rate swaps - assets		2,755
Other long-term assets, net \| Fair Value Level 1
Assets:
Interest rate swaps - assets		0
Other long-term assets, net \| Fair Value Level 2
Assets:
Interest rate swaps - assets		2,755
Other long-term assets, net \| Fair Value Level 3
Assets:
Interest rate swaps - assets		0
Accrued liabilities
Liabilities:
Product imbalances - liability	(433)	(419)
Commodity derivatives - liabilities	(884)	(120)
Accrued liabilities \| Fair Value Level 1
Liabilities:
Product imbalances - liability	(433)	(419)
Commodity derivatives - liabilities	(751)	0
Accrued liabilities \| Fair Value Level 2
Liabilities:
Product imbalances - liability	0	0
Commodity derivatives - liabilities	(133)	(120)
Accrued liabilities \| Fair Value Level 3
Liabilities:
Product imbalances - liability	0	0
Commodity derivatives - liabilities	0	0
Other long-term liabilities
Liabilities:
Guarantee liability	(1,400)	(1,697)
Interest rate swaps - liabilities	(28,675)	(1,452)
Other long-term liabilities \| Fair Value Level 1
Liabilities:
Guarantee liability	0	0
Interest rate swaps - liabilities	0	0
Other long-term liabilities \| Fair Value Level 2
Liabilities:
Guarantee liability	0	0
Interest rate swaps - liabilities	(28,675)	(1,452)
Other long-term liabilities \| Fair Value Level 3
Liabilities:
Guarantee liability	(1,400)	(1,697)
Interest rate swaps - liabilities	$ 0	$ 0

FAIR VALUE MEASUREMENTS Narrative (Details)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Feb. 26, 2014 USD ($)	Dec. 31, 2013 USD ($)
Axeon [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Equity method losses in excess of investment			$ 21,300,000
Investment in joint venture				$ 0
Axeon [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Maximum Amount Guarantees	$ 125,000,000
Term Loan Receivable	190,000,000
Carrying amount, Axeon Term Loan	170,055,000	$ 170,352,000
Guarantee liability	1,400,000
Axeon [Member] \| Financial Standby Letter of Credit [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Amount of Guarantees Provided	19,700,000
Axeon [Member] \| Financial Guarantee [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Amount of Guarantees Provided	$ 59,300,000	$ 71,900,000
Number of Guarantees with Unlimited Exposure	1	2
Axeon [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Ownership Percentage of Entity Sold			50.00%

FAIR VALUE MEASUREMENTS Table 2 (Details) $ in Thousands	3 Months Ended
FAIR VALUE MEASUREMENTS Table 2 (Details) $ in Thousands	Mar. 31, 2016 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,697
Ending balance	1,400
Guarantees [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Adjustments to guarantee liability	$ (297)

FAIR VALUE MEASUREMENTS Table 3 (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value and Carrying Value of Debt and Note Receivable from Counterparty [Line Items]
Fair value, long-term debt	$ 2,980,166	$ 2,929,438
Carrying amount, long-term debt	3,125,650	3,055,612
Axeon [Member]
Fair Value and Carrying Value of Debt and Note Receivable from Counterparty [Line Items]
Fair value, Axeon Term Loan	173,197	172,123
Carrying amount, Axeon Term Loan	$ 170,055	$ 170,352

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Narrative (Details) bbl in Millions			3 Months Ended
	Mar. 31, 2016 USD ($) bbl	Dec. 31, 2015 USD ($) bbl	Mar. 31, 2016 USD ($)
Derivative [Line Items]
Margin Deposit	$ 2,000,000	$ 0	$ 2,000,000
Interest rate swaps \| Cash Flow Hedges
Derivative [Line Items]
Interest Rate Swaps Interest Rate Received			receive a rate based on three month USD LIBOR
Notional amount of forward-starting interest rate swaps	$ 600,000,000	$ 600,000,000.0	$ 600,000,000
Commodity contracts
Derivative [Line Items]
Notional amount of commodity contracts, volume (in barrels) \| bbl	4.8	8.0

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value
Asset Derivatives	$ 3,996	$ 38,825
Liability Derivatives	(31,815)	(26,240)
Designated as Hedging Instrument
Derivatives, Fair Value
Asset Derivatives	88	4,692
Liability Derivatives	(29,033)	(1,475)
Designated as Hedging Instrument \| Commodity contracts \| Other current assets
Derivatives, Fair Value
Asset Derivatives	0	1,937
Liability Derivatives	0	(23)
Designated as Hedging Instrument \| Commodity contracts \| Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	88	0
Liability Derivatives	(358)	0
Not Designated as Hedging Instrument
Derivatives, Fair Value
Asset Derivatives	3,908	34,133
Liability Derivatives	(2,782)	(24,765)
Not Designated as Hedging Instrument \| Commodity contracts \| Other current assets
Derivatives, Fair Value
Asset Derivatives	2,773	34,016
Liability Derivatives	(1,033)	(24,528)
Not Designated as Hedging Instrument \| Commodity contracts \| Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	1,135	117
Liability Derivatives	(1,749)	(237)
Cash Flow Hedges \| Designated as Hedging Instrument \| Interest rate swaps \| Other long-term assets, net
Derivatives, Fair Value
Asset Derivatives	0	2,755
Liability Derivatives	0	0
Cash Flow Hedges \| Designated as Hedging Instrument \| Interest rate swaps \| Other long-term liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	$ (28,675)	$ (1,452)

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 2 (Details) - Commodity contracts - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative Assets and Liabilities Eligible for Offset, Net [Line Items]
Net amounts of assets presented in the consolidated balance sheets	$ 1,740	$ 11,402
Net amounts of liabilities presented in the consolidated balance sheets	$ (884)	$ (120)

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 3 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss)
Gain (loss) to be reclassified during next 12 months, forward-starting interest rate swaps	$ (7,900)
Designated as Hedging Instrument \| Fair Value Hedges \| Commodity contracts \| Cost of product sales
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income on derivative	(1,012)	$ 2,164
Gain (loss) recognized in income on hedged item	2,866	(1,676)
Gain (loss) recognized in income for ineffective portion	1,854	488
Designated as Hedging Instrument \| Cash Flow Hedges \| Interest rate swaps \| Interest expense, net
Derivative Instruments, Gain (Loss)
Gain (loss) reclassified from AOCI into interest expense, net (effective portion) (a)	(2,222)	(2,538)
Designated as Hedging Instrument \| Cash Flow Hedges \| Interest rate swaps \| Other comprehensive income
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in other comprehensive income on derivative (effective portion)	(29,978)	(2,035)
Not Designated as Hedging Instrument \| Commodity contracts \| Cost of product sales
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income on derivative	$ 720	$ 330

RELATED PARTY TRANSACTIONS Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Administrative Fees, Description	The Amended GP Services Agreement provides that we will furnish administrative services necessary to conduct the business of NuStar GP Holdings. NuStar GP Holdings will compensate us for these services through an annual fee of $1.0 million, subject to adjustment based on the annual merit increase percentage applicable to our employees for the most recently completed fiscal year and for changes in level of service
Receivable from related party	$ 2,295	$ 0
Payable to related party	0	14,799
Long-term payable to related party	$ 0	$ 32,080

RELATED PARTY TRANSACTIONS Table 1 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Related Party Transaction [Line Items]
Operating expenses	$ 21,681	$ 31,287
General and administrative expenses	$ 10,420	$ 17,386

RELATED PARTY TRANSACTIONS Table 2 (Details) $ in Thousands	Mar. 01, 2016 USD ($)
Decrease in related party payable:
Current	$ 16,014
Long-term	32,656
Decrease in related party payable	48,670
Changes to our consolidated balance sheet:
Current and long-term assets	2,154
Current liabilities	5,609
Other long-term liabilities	34,042
Limited partners' equity	2,664
Accumulated other comprehensive loss	4,201
Changes to our consolidated balance sheet	$ 48,670

EMPLOYEE BENEFIT PLANS Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Mar. 01, 2016	Mar. 31, 2016	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
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 based on age, service and interest credits, and employees become fully vested in their benefits upon attaining three years of vesting service.
Pension and OPEB assumptions		We estimate pension and other postretirement benefit obligations and costs from actuarial valuations. The actuarial valuations require the use of certain assumptions, including discount rates, expected long-term rates of return on plan assets and expected rates of compensation increase. The amortization of actuarial gains and losses reflects a corridor based on 10% of the greater of the projected benefit obligation or the market-related value of the pension plan assets.
Defined Benefit Plan Disclosure [Line Items]
Thrift Plan, description		The NuStar Thrift Plan (the Thrift Plan) is a qualified defined contribution plan and participation in the Thrift Plan is voluntary and open to substantially all our employees upon their date 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.
Pension Plans (The Pension Plan and Excess Pension Plan)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Obligation Assumed	$ 22.5
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Obligation Assumed	$ 10.2
Subsequent Event [Member] \| Pension Plans (The Pension Plan and Excess Pension Plan)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year			$ 8.1
Subsequent Event [Member] \| Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year			$ 0.3

EMPLOYEE BENEFIT PLANS Table 1 (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Pension Plans (The Pension Plan and Excess Pension Plan)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 87,706
Less: Benefit obligation	109,202
Funded status	(21,496)
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0
Less: Benefit obligation	10,042
Funded status	$ (10,042)

EMPLOYEE BENEFIT PLANS Table 2 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Plans (The Pension Plan and Excess Pension Plan)
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,926	$ 1,919
Interest cost	1,006	1,097
Expected return on assets	(1,352)	(1,254)
Amortization of prior service credit	(517)	(516)
Amortization of net loss	273	461
Net periodic benefit cost (income)	1,336	1,707
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	105	118
Interest cost	100	112
Expected return on assets	0	0
Amortization of prior service credit	(286)	(286)
Amortization of net loss	45	67
Net periodic benefit cost (income)	$ (36)	$ 11

UNIT-BASED COMPENSATION Narrative (Details) - shares		3 Months Ended
UNIT-BASED COMPENSATION Narrative (Details) - shares	Mar. 01, 2016	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, number of outstanding awards transferred	688,647
Restricted units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, number of outstanding awards transferred	604,153
Restricted Units, domestic employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, vesting period		5 years
Restricted units, non-employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, vesting period		3 years
Restricted units, certain international employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, number of outstanding awards transferred	49,121
Restricted units, certain international employees \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, vesting period		3 years
Restricted units, certain international employees \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, vesting period		5 years
Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, number of outstanding awards transferred	35,373
Unit-based compensation, description of performance measure		The objective performance measure for the outstanding performance unit awards is a specific distribution coverage ratio (DCR) determined each year by the NuStar GP, LLC Compensation Committee for the following year. Our DCR determines the rate at which the performance units convert into our common units which can range from zero to 200%.
Unit-based compensation, terms of performance units		Performance units vest in three annual increments (tranches), based upon our DCR during the one-year performance periods that end on December 31 of each year following the date of grant.
The Amended 2000 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, number of units authorized		3,250,000
Unit-based compensation, number of units available to be awarded		1,201,757

PARTNERS' EQUITY Table 1 (Details) - USD ($) $ in Thousands	3 Months Ended
PARTNERS' EQUITY Table 1 (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as of December 31, 2015	$ 1,609,844
Net income	57,401	$ 127,899
Unit-based compensation	3,236
Other comprehensive loss	(14,778)
Cash distributions to partners	(98,051)
Balance as of March 31, 2016	$ 1,557,652

- Definition

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

+ References + Details

PARTNERS' EQUITY Table 2 (Details) $ in Thousands	3 Months Ended
PARTNERS' EQUITY Table 2 (Details) $ in Thousands	Mar. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016	$ (88,794)
Other comprehensive loss	(14,778)
Balance as of March 31, 2016	(103,572)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016	(60,826)
Employee Transfer	0
Other comprehensive income (loss) before reclassification adjustments	8,938
Other comprehensive loss	8,938
Balance as of March 31, 2016	(51,888)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016	(27,968)
Employee Transfer	0
Other comprehensive income (loss) before reclassification adjustments	(29,978)
Other comprehensive loss	(27,756)
Balance as of March 31, 2016	(55,724)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016	0
Employee Transfer	4,201
Other comprehensive income (loss) before reclassification adjustments	0
Other comprehensive loss	4,040
Balance as of March 31, 2016	4,040
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016	(88,794)
Employee Transfer	4,201
Other comprehensive income (loss) before reclassification adjustments	(21,040)
Other comprehensive loss	(14,778)
Balance as of March 31, 2016	(103,572)
Operating expense \| Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Operating expense \| Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Operating expense \| Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(120)
Operating expense \| Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(120)
General and administrative expense \| Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
General and administrative expense \| Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
General and administrative expense \| Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(41)
General and administrative expense \| Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(41)
Interest expense, net \| Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Interest expense, net \| Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,222
Interest expense, net \| Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Interest expense, net \| Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 2,222

PARTNERS' EQUITY Narrative (Details)	3 Months Ended
PARTNERS' EQUITY Narrative (Details)	Mar. 31, 2016
Equity [Abstract]
Percentage of Incentive Cash Distributions Allocated to the General Partner	100.00%

PARTNERS' EQUITY Table 3 (Details) - USD ($) $ in Thousands	3 Months Ended
PARTNERS' EQUITY Table 3 (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Net Income Allocation [Abstract]
Net income applicable to general partner and limited partners' interest	$ 57,401	$ 127,899
Less general partner incentive distribution	10,805	10,805
Net income after general partner incentive distribution	$ 46,596	$ 117,094
General partner interest	2.00%	2.00%
General partner allocation of net income after general partner incentive distribution	$ 932	$ 2,342
General partner incentive distribution	10,805	10,805
Net income applicable to general partner	$ 11,737	$ 13,147

- Definition

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

+ References + Details

PARTNERS' EQUITY Table 4 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Distributions Made to Limited Partners and General Partner [Line Items]
General partner interest	$ 1,961		$ 1,961
General partner incentive distribution	10,805		10,805
Total general partner distribution	12,766		12,766
Limited partners' distribution	85,285		85,285
Total cash distributions	$ 98,051	$ 98,051	$ 98,051
Cash distributions per unit applicable to limited partners	$ 1.095	$ 1.095	$ 1.095

PARTNERS' EQUITY Table 5 (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Apr. 27, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Distribution Made to Limited Partner [Line Items]
Cash distributions per unit applicable to limited partners		$ 1.095	$ 1.095	$ 1.095
Total cash distributions (distribution earned)		$ 98,051	$ 98,051	$ 98,051
Distribution date of record (distribution earned)		May 09, 2016	Feb. 08, 2016
Distribution payment date (distribution earned)		May 13, 2016	Feb. 12, 2016
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]
Distribution anouncement date (distribution earned)	Apr. 27, 2016

NET INCOME PER UNIT Table (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income attributable to NuStar Energy L.P.	$ 57,401	$ 127,899
Less: Distributions to general partner (including incentive distribution rights)	12,766	12,766
Less: DERs to restricted units	713	0
Less: Distributions to limited partner	85,285	85,285
Distributions (in excess of) less than earnings	(41,363)	29,848
Net income attributable to limited parter units:
Distributions to limited partner	85,285	85,285
Allocation of distributions (in excess of) less than earnings	(40,535)	29,251
Total	$ 44,750	$ 114,536
Diluted units outstanding:
Basic weighted-average limited partner units outstanding	77,886,078	77,886,078
Effect of dilutive participating securities	70,746	0
Diluted weighted-average limited partner units outstanding	77,956,824	77,886,078
Basic and diluted net income per unit applicable to limited partners	$ 0.57	$ 1.47

NET INCOME PER UNIT Net Income Per Unit Non-Printing Section (Details) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Diluted net income per unit	$ 0.57	$ 1.47

STATEMENTS OF CASH FLOWS Table 1 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Decrease (increase) in current assets:
Accounts receivable	$ 11,706	$ 19,654
Inventories	(2,398)	11,997
Other current assets	5,613	10,963
Increase (decrease) in current liabilities:
Accounts payable	(3,370)	(21,776)
Payable to related party, net	(1,575)	1,145
Accrued interest payable	(6,389)	(5,948)
Accrued liabilities	(16,859)	(23,191)
Taxes other than income tax	593	(1,738)
Income tax payable	189	1,120
Changes in current assets and current liabilities	$ (12,490)	$ (7,774)

STATEMENTS OF CASH FLOWS Table 2 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Cash Flows [Abstract]
Cash paid for interest, net of amount capitalized	$ 41,079	$ 38,044
Cash paid for income taxes, net of tax refunds received	$ 2,742	$ 1,738

SEGMENT INFORMATION Table 1 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Revenues	$ 405,703	$ 554,944
Operating income:
General and administrative expenses	23,785	25,053
Depreciation and amortization expense	53,142	52,457
Operating income	94,565	99,281
Pipeline Segment
Revenues:
Revenues	118,873	124,425
Storage Segment
Revenues:
Revenues	152,399	150,334
Storage Segment \| Third Party Revenue [Member]
Revenues:
Revenues	146,384	144,085
Storage Segment \| Intersegment revenue [Member]
Revenues:
Revenues	6,015	6,249
Fuels Marketing Segment \| Third Party Revenue [Member]
Revenues:
Revenues	140,446	286,434
Operating Segments [Member]
Operating income:
Operating income	120,505	126,586
Operating Segments [Member] \| Pipeline Segment
Operating income:
Operating income	64,265	68,640
Operating Segments [Member] \| Storage Segment
Operating income:
Operating income	57,013	47,978
Operating Segments [Member] \| Fuels Marketing Segment
Operating income:
Operating income	(773)	9,925
Intersegment Eliminations [Member]
Revenues:
Revenues	(6,015)	(6,249)
Operating income:
Operating income	0	43
Corporate, Non-Segment [Member]
Operating income:
General and administrative expenses	23,785	25,053
Depreciation and amortization expense	$ 2,155	$ 2,252

SEGMENT INFORMATION Table 2 (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Segment Information
Total consolidated assets	$ 5,095,549	$ 5,125,525
Operating Segments [Member]
Segment Information
Total consolidated assets	4,615,781	4,647,353
Operating Segments [Member] \| Pipeline Segment
Segment Information
Total consolidated assets	1,999,202	2,014,098
Operating Segments [Member] \| Storage Segment
Segment Information
Total consolidated assets	2,471,658	2,476,389
Operating Segments [Member] \| Fuels Marketing Segment
Segment Information
Total consolidated assets	144,921	156,866
Operating Segments [Member] \| Other partnership assets
Segment Information
Total consolidated assets	$ 479,768	$ 478,172

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 130,917	$ 118,862	$ 78,183	$ 87,912
Receivables, net	135,764	145,064
Inventories	41,173	38,749
Other current assets	25,719	31,176
Intercompany receivable	0	0
Total current assets	333,573	333,851
Property, plant and equipment, net	3,686,687	3,683,571
Intangible assets, net	108,551	112,011
Goodwill	696,637	696,637
Investment in wholly owned subsidiaries	0	0
Deferred income tax asset	502	2,858
Other long-term assets, net	269,599	296,597
Total assets	5,095,549	5,125,525
Liabilities and Partners' Equity
Payables	100,782	139,946
Short-term debt	81,000	84,000
Accrued interest payable	27,897	34,286
Accrued liabilities	43,355	55,194
Taxes other than income tax	13,599	12,810
Income tax payable	6,157	5,977
Intercompany payable	0	0
Total current liabilities	272,790	332,213
Long-term debt	3,125,650	3,055,612
Long-term payable to related party	0	32,080
Deferred income tax liability	25,841	24,810
Other long-term liabilities	113,616	70,966
Total partners' equity	1,557,652	1,609,844
Total liabilities and partners' equity	5,095,549	5,125,525
Eliminations
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Inventories	0	0
Other current assets	0	0
Intercompany receivable	(1,574,862)	(1,610,370)
Total current assets	(1,574,862)	(1,610,370)
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Goodwill	0	0
Investment in wholly owned subsidiaries	(4,177,479)	(4,200,728)
Deferred income tax asset	(1,179)	(1,179)
Other long-term assets, net	0	0
Total assets	(5,753,520)	(5,812,277)
Liabilities and Partners' Equity
Payables	0	0
Short-term debt	0	0
Accrued interest payable	0	0
Accrued liabilities	0	0
Taxes other than income tax	0	0
Income tax payable	0	0
Intercompany payable	(1,574,862)	(1,610,370)
Total current liabilities	(1,574,862)	(1,610,370)
Long-term debt	0	0
Long-term payable to related party		0
Deferred income tax liability	(1,179)	(1,179)
Other long-term liabilities	0	0
Total partners' equity	(4,177,479)	(4,200,728)
Total liabilities and partners' equity	(5,753,520)	(5,812,277)
NuStar Energy
Assets
Cash and cash equivalents	879	885	923	923
Receivables, net	0	0
Inventories	0	0
Other current assets	93	140
Intercompany receivable	0	0
Total current assets	972	1,025
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Goodwill	0	0
Investment in wholly owned subsidiaries	2,165,781	2,205,904
Deferred income tax asset	0	0
Other long-term assets, net	939	933
Total assets	2,167,692	2,207,862
Liabilities and Partners' Equity
Payables	0	12
Short-term debt	0	0
Accrued interest payable	0	0
Accrued liabilities	645	723
Taxes other than income tax	189	126
Income tax payable	0	0
Intercompany payable	505,634	508,363
Total current liabilities	506,468	509,224
Long-term debt	0	0
Long-term payable to related party		0
Deferred income tax liability	0	0
Other long-term liabilities	0	0
Total partners' equity	1,661,224	1,698,638
Total liabilities and partners' equity	2,167,692	2,207,862
NuStar Logistics
Assets
Cash and cash equivalents	4	4	6	6
Receivables, net	727	419
Inventories	1,929	1,776
Other current assets	8,088	11,026
Intercompany receivable	1,574,862	1,610,370
Total current assets	1,585,610	1,623,595
Property, plant and equipment, net	1,919,232	1,915,370
Intangible assets, net	47,251	48,961
Goodwill	149,453	149,453
Investment in wholly owned subsidiaries	45,432	48,547
Deferred income tax asset	0	0
Other long-term assets, net	228,901	255,957
Total assets	3,975,879	4,041,883
Liabilities and Partners' Equity
Payables	25,923	52,650
Short-term debt	81,000	84,000
Accrued interest payable	27,874	34,271
Accrued liabilities	7,778	32,816
Taxes other than income tax	4,128	6,452
Income tax payable	1,708	1,362
Intercompany payable	0	0
Total current liabilities	148,411	211,551
Long-term debt	3,077,717	3,002,743
Long-term payable to related party		26,638
Deferred income tax liability	1,143	1,143
Other long-term liabilities	48,194	37,209
Total partners' equity	700,414	762,599
Total liabilities and partners' equity	3,975,879	4,041,883
NuPOP
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Inventories	5,755	3,648
Other current assets	4,402	497
Intercompany receivable	0	0
Total current assets	10,157	4,145
Property, plant and equipment, net	568,355	570,415
Intangible assets, net	0	0
Goodwill	170,652	170,652
Investment in wholly owned subsidiaries	1,056,445	1,031,162
Deferred income tax asset	0	0
Other long-term assets, net	26,329	26,329
Total assets	1,831,938	1,802,703
Liabilities and Partners' Equity
Payables	7,470	11,193
Short-term debt	0	0
Accrued interest payable	0	0
Accrued liabilities	8,235	5,753
Taxes other than income tax	4,345	3,325
Income tax payable	12	9
Intercompany payable	894,589	858,018
Total current liabilities	914,651	878,298
Long-term debt	0	0
Long-term payable to related party		0
Deferred income tax liability	36	36
Other long-term liabilities	7,460	9,294
Total partners' equity	909,791	915,075
Total liabilities and partners' equity	1,831,938	1,802,703
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	130,034	117,973	$ 77,254	$ 86,983
Receivables, net	135,037	144,645
Inventories	33,489	33,325
Other current assets	13,136	19,513
Intercompany receivable	0	0
Total current assets	311,696	315,456
Property, plant and equipment, net	1,199,100	1,197,786
Intangible assets, net	61,300	63,050
Goodwill	376,532	376,532
Investment in wholly owned subsidiaries	909,821	915,115
Deferred income tax asset	1,681	4,037
Other long-term assets, net	13,430	13,378
Total assets	2,873,560	2,885,354
Liabilities and Partners' Equity
Payables	67,389	76,091
Short-term debt	0	0
Accrued interest payable	23	15
Accrued liabilities	26,697	15,902
Taxes other than income tax	4,937	2,907
Income tax payable	4,437	4,606
Intercompany payable	174,639	243,989
Total current liabilities	278,122	343,510
Long-term debt	47,933	52,869
Long-term payable to related party		5,442
Deferred income tax liability	25,841	24,810
Other long-term liabilities	57,962	24,463
Total partners' equity	2,463,702	2,434,260
Total liabilities and partners' equity	$ 2,873,560	$ 2,885,354

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 2 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 405,703	$ 554,944
Costs and expenses	311,138	455,663
Operating (loss) income	94,565	99,281
Equity in earnings (loss) of subsidiaries	0	0
Interest (expense) income, net	(34,123)	(32,037)
Other income (expense), net	(171)	62,268
Income from continuing operations before income tax expense	60,271	129,512
Income tax expense (benefit)	2,870	2,387
Income from continuing operations	57,401	127,125
Income from discontinued operations, net of tax	0	774
Net income	57,401	127,899
Comprehensive income (loss)	42,623	107,798
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenues	(336)	(327)
Costs and expenses	(336)	(369)
Operating (loss) income	0	42
Equity in earnings (loss) of subsidiaries	(123,833)	(307,197)
Interest (expense) income, net	(4,351)	0
Other income (expense), net	0	0
Income from continuing operations before income tax expense	(128,184)	(307,155)
Income tax expense (benefit)	0	0
Income from continuing operations		(307,155)
Income from discontinued operations, net of tax		0
Net income	(128,184)	(307,155)
Comprehensive income (loss)	(128,184)	(307,155)
NuStar Energy
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Costs and expenses	518	490
Operating (loss) income	(518)	(490)
Equity in earnings (loss) of subsidiaries	57,922	128,389
Interest (expense) income, net	0	0
Other income (expense), net	0	0
Income from continuing operations before income tax expense	57,404	127,899
Income tax expense (benefit)	3	0
Income from continuing operations		127,899
Income from discontinued operations, net of tax		0
Net income	57,401	127,899
Comprehensive income (loss)	57,401	127,899
NuStar Logistics
Condensed Financial Statements, Captions [Line Items]
Revenues	126,578	134,036
Costs and expenses	68,891	72,906
Operating (loss) income	57,687	61,130
Equity in earnings (loss) of subsidiaries	(3,115)	(4,164)
Interest (expense) income, net	(39,632)	(32,174)
Other income (expense), net	1	1,340
Income from continuing operations before income tax expense	14,941	26,132
Income tax expense (benefit)	346	(1,026)
Income from continuing operations		27,158
Income from discontinued operations, net of tax		0
Net income	14,595	27,158
Comprehensive income (loss)	(13,161)	27,661
NuPOP
Condensed Financial Statements, Captions [Line Items]
Revenues	47,985	52,574
Costs and expenses	31,015	33,124
Operating (loss) income	16,970	19,450
Equity in earnings (loss) of subsidiaries	25,283	81,699
Interest (expense) income, net	1,508	119
Other income (expense), net	(17)	2
Income from continuing operations before income tax expense	43,744	101,270
Income tax expense (benefit)	2	0
Income from continuing operations		101,270
Income from discontinued operations, net of tax		0
Net income	43,742	101,270
Comprehensive income (loss)	43,742	101,270
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenues	231,476	368,661
Costs and expenses	211,050	349,512
Operating (loss) income	20,426	19,149
Equity in earnings (loss) of subsidiaries	43,743	101,273
Interest (expense) income, net	8,352	18
Other income (expense), net	(155)	60,926
Income from continuing operations before income tax expense	72,366	181,366
Income tax expense (benefit)	2,519	3,413
Income from continuing operations		177,953
Income from discontinued operations, net of tax		774
Net income	69,847	178,727
Comprehensive income (loss)	$ 82,825	$ 158,123

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 3 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 101,727	$ 122,582
Cash flows from investing activities:
Capital expenditures	(46,176)	(72,880)
Change in accounts payable related to capital expenditures	(12,663)	(13,464)
Acquisitions	0	(142,500)
Investment in other long-term assets	0	(2,177)
Proceeds from sale or disposition of assets	0	1,185
Net cash used in investing activities	(58,839)	(229,836)
Cash flows from financing activities:
Debt borrowings	302,089	493,532
Debt repayments	(230,709)	(277,166)
Distributions to unitholders and general partner	(98,051)	(98,051)
Net intercompany activity	0	0
Other, net	(8,804)	(14,304)
Net cash (used in) provided by financing activities	(35,475)	104,011
Effect of foreign exchange rate changes on cash	4,642	(6,486)
Net increase (decrease) in cash and cash equivalents	12,055	(9,729)
Cash and cash equivalents as of the beginning of the period	118,862	87,912
Cash and cash equivalents as of the end of the period	130,917	78,183
Eliminations
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(151,433)	(147,082)
Cash flows from investing activities:
Capital expenditures	0	0
Change in accounts payable related to capital expenditures	0	0
Acquisitions		0
Investment in other long-term assets		0
Proceeds from sale or disposition of assets		0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to unitholders and general partner	147,082	147,082
Net intercompany activity	4,351	0
Other, net	0	0
Net cash (used in) provided by financing activities	151,433	147,082
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of the beginning of the period	0	0
Cash and cash equivalents as of the end of the period	0	0
NuStar Energy
Cash flows from operating activities:
Net cash provided by (used in) operating activities	97,539	97,235
Cash flows from investing activities:
Capital expenditures	0	0
Change in accounts payable related to capital expenditures	0	0
Acquisitions		0
Investment in other long-term assets		0
Proceeds from sale or disposition of assets		0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to unitholders and general partner	(98,051)	(98,051)
Net intercompany activity	507	816
Other, net	(1)	0
Net cash (used in) provided by financing activities	(97,545)	(97,235)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	(6)	0
Cash and cash equivalents as of the beginning of the period	885	923
Cash and cash equivalents as of the end of the period	879	923
NuStar Logistics
Cash flows from operating activities:
Net cash provided by (used in) operating activities	7,958	40,425
Cash flows from investing activities:
Capital expenditures	(28,899)	(58,476)
Change in accounts payable related to capital expenditures	(7,637)	(8,554)
Acquisitions		0
Investment in other long-term assets		0
Proceeds from sale or disposition of assets		9
Net cash used in investing activities	(36,536)	(67,021)
Cash flows from financing activities:
Debt borrowings	296,089	493,532
Debt repayments	(219,709)	(277,166)
Distributions to unitholders and general partner	(49,026)	(49,025)
Net intercompany activity	2,998	(134,700)
Other, net	(1,774)	(6,045)
Net cash (used in) provided by financing activities	28,578	26,596
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of the beginning of the period	4	6
Cash and cash equivalents as of the end of the period	4	6
NuPOP
Cash flows from operating activities:
Net cash provided by (used in) operating activities	18,028	35,918
Cash flows from investing activities:
Capital expenditures	(5,442)	(4,651)
Change in accounts payable related to capital expenditures	(74)	(516)
Acquisitions		0
Investment in other long-term assets		0
Proceeds from sale or disposition of assets		4
Net cash used in investing activities	(5,516)	(5,163)
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to unitholders and general partner	(49,025)	(49,026)
Net intercompany activity	36,513	18,271
Other, net	0	0
Net cash (used in) provided by financing activities	(12,512)	(30,755)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of the beginning of the period	0	0
Cash and cash equivalents as of the end of the period	0	0
Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net cash provided by (used in) operating activities	129,635	96,086
Cash flows from investing activities:
Capital expenditures	(11,835)	(9,753)
Change in accounts payable related to capital expenditures	(4,952)	(4,394)
Acquisitions		(142,500)
Investment in other long-term assets		(2,177)
Proceeds from sale or disposition of assets		1,172
Net cash used in investing activities	(16,787)	(157,652)
Cash flows from financing activities:
Debt borrowings	6,000	0
Debt repayments	(11,000)	0
Distributions to unitholders and general partner	(49,031)	(49,031)
Net intercompany activity	(44,369)	115,613
Other, net	(7,029)	(8,259)
Net cash (used in) provided by financing activities	(105,429)	58,323
Effect of foreign exchange rate changes on cash	4,642	(6,486)
Net increase (decrease) in cash and cash equivalents	12,061	(9,729)
Cash and cash equivalents as of the beginning of the period	117,973	86,983
Cash and cash equivalents as of the end of the period	$ 130,034	$ 77,254