NuStar Energy (NS) 10-Q 8 May 18 2018 Q1 Quarterly report Financial data

DEI Document

DEI Document - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document Information [Abstract]
Entity Registrant Name	NuStar Energy L.P.
Entity Central Index Key	1,110,805
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	ns
Amendment Flag	false
Entity Partnership Units Outstanding		93,183,029

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 15,128	$ 24,292
Accounts receivable, net of allowance for doubtful accounts of $10,344 and $9,948 as of March 31, 2018 and December 31, 2017, respectively	157,269	176,570
Receivable from related party	72	205
Inventories	29,549	26,857
Other current assets	25,979	22,508
Total current assets	227,997	250,432
Property, plant and equipment, at cost	6,388,927	6,243,481
Accumulated depreciation and amortization	(2,001,703)	(1,942,548)
Property, plant and equipment, net	4,387,224	4,300,933
Intangible assets, net	771,623	784,479
Goodwill	1,094,661	1,097,475
Deferred income tax asset	0	233
Other long-term assets, net	105,208	101,681
Total assets	6,586,713	6,535,233
Current liabilities:
Accounts payable	122,040	145,932
Short-term debt	70,000	35,000
Current portion of long-term debt	349,973	349,990
Accrued interest payable	43,974	40,449
Accrued liabilities	47,520	61,578
Taxes other than income tax	12,751	14,385
Income tax payable	6,378	4,172
Total current liabilities	652,636	651,506
Long-term debt, less current portion	3,306,093	3,263,069
Deferred income tax liability	23,032	22,272
Other long-term liabilities	112,895	118,297
Commitments and contingencies (Note 6)
Partners' equity:
Common limited partners (93,182,045 and 93,176,683 common units outstanding as of March 31, 2018 and December 31, 2017, respectively)	1,772,874	1,770,587
General partner	26,692	37,826
Accumulated other comprehensive loss	(64,003)	(84,927)
Total partners’ equity	2,492,057	2,480,089
Total liabilities and partners' equity	6,586,713	6,535,233
Series A Preferred Limited Partner [Member]
Partners' equity:
Preferred limited partners	218,307	218,307
Series B Preferred Limited Partner [Member]
Partners' equity:
Preferred limited partners	371,634	371,634
Series C Preferred Limited Partner [Member]
Partners' equity:
Preferred limited partners	$ 166,553	$ 166,662

CONSOLIDATED BALANCE SHEETS Non

CONSOLIDATED BALANCE SHEETS Non-Printing - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 10,344	$ 9,948
Limited partners common units outstanding (in units)	93,182,045	93,176,683
Series A Preferred Limited Partner [Member]
Preferred units outstanding	9,060,000	9,060,000
Series B Preferred Limited Partner [Member]
Preferred units outstanding	15,400,000	15,400,000
Series C Preferred Limited Partner [Member]
Preferred units outstanding	6,900,000	6,900,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Service revenues	$ 291,413	$ 266,462
Product sales	184,468	220,968
Total revenues	475,881	487,430
Costs and expenses:
Operating expenses (excluding depreciation and amortization expense)	108,884	101,026
Depreciation and amortization expense	69,897	54,671
Total costs associated with service revenues	178,781	155,697
Cost of Goods Sold	176,728	207,806
General and administrative expenses (excluding depreciation and amortization expense)	19,774	24,595
Other depreciation and amortization expense	2,118	2,193
Total costs and expenses	377,401	390,291
Operating income	98,480	97,139
Interest expense, net	(47,772)	(36,414)
Other income, net	79,752	140
Income before income tax expense	130,460	60,865
Income tax expense	4,327	2,925
Net income	$ 126,133	$ 57,940
Basic net income per common unit (Note 13)	$ 1.15	$ 0.49
Basic weighted-average common units outstanding	93,181,781	78,642,888
Comprehensive income	$ 147,057	$ 61,703

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ 126,133	$ 57,940
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	72,015	56,864
Unit-based compensation expense	2,091	2,790
Amortization of debt related items	1,413	1,568
Gain from sale or disposition of assets	(19)	(48)
Gain from insurance recoveries	(78,756)	0
Deferred income tax expense	842	291
Changes in current assets and current liabilities (Note 14)	10,691	(39,142)
Other, net	(11,246)	3,717
Net cash provided by operating activities	123,164	83,980
Cash flows from investing activities:
Capital expenditures	(137,874)	(45,732)
Change in accounts payable related to capital expenditures	(12,018)	(6,820)
Proceeds from sale or disposition of assets	19	1,859
Proceeds from Axeon term loan	0	110,000
Proceeds from insurance recoveries	78,419	0
Net cash provided by (used in) investing activities	(71,454)	59,307
Cash flows from financing activities:
Proceeds from long-term debt borrowings	119,711	144,266
Proceeds from short-term debt borrowings	230,000	266,000
Long-term debt repayments	(79,421)	(207,194)
Short-term debt repayments	(195,000)	(248,000)
Distributions to preferred unitholders	(16,680)	(5,883)
Distributions to common unitholders and general partner	(115,272)	(99,021)
Increase (decrease) in cash book overdrafts	(1,009)	(283)
Other, net	(3,175)	(1,935)
Net cash used in financing activities	(60,846)	(152,050)
Effect of foreign exchange rate changes on cash	(28)	26
Net increase (decrease) in cash and cash equivalents	(9,164)	(8,737)
Cash and cash equivalents as of the beginning of the period	24,292	35,942
Cash and cash equivalents as of the end of the period	$ 15,128	$ 27,205

ORGANIZATION AND BASIS OF PRESE

ORGANIZATION AND BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2018
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, and the terminalling, storage and 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 11% common limited partner interest in us as of March 31, 2018 . 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 Hurricane Activity. In the third quarter of 2017, several of our facilities were affected by the hurricanes in the Caribbean and Gulf of Mexico, including our St. Eustatius terminal, which experienced the most damage and was temporarily shut down. The damage caused by the Caribbean hurricane resulted in lower revenues for our bunker fuel operations in our fuels marketing segment and lower throughput and associated handling fees in our storage segment in 2017 and in the first quarter of 2018. In January 2018, we received $87.5 million of insurance proceeds in settlement of our property damage claim for our St. Eustatius terminal, of which $9.1 million related to business interruption. Proceeds from business interruption insurance are included in “Operating expenses” in the consolidated statements of income and in “Cash flows from operating activities” in the consolidated statements of cash flows. We recorded a $78.8 million gain in “Other income, net” in the consolidated statements of income in the first quarter of 2018 for the amount by which the insurance proceeds exceeded our expenses incurred during the period. We expect that the costs to repair the property damage at the terminal will not exceed the amount of insurance proceeds received. 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. Inter-partnership balances and transactions have been eliminated in consolidation. 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, 2018 and 2017 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, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . The consolidated balance sheet as of December 31, 2017 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, 2017 . Certain previously reported amounts in the 2017 consolidated financial statements have been reclassified to conform to the 2018 presentation.

MERGER AGREEMENT

MERGER AGREEMENT	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
MERGER AGREEMENT	MERGER AGREEMENT On February 7, 2018, NuStar Energy, Riverwalk Logistics, L.P., NuStar GP, LLC, Marshall Merger Sub LLC, a wholly owned subsidiary of NuStar Energy (Merger Sub), Riverwalk Holdings, LLC and NuStar GP Holdings entered into an Agreement and Plan of Merger (the Merger Agreement) pursuant to which Merger Sub will merge with and into NuStar GP Holdings with NuStar GP Holdings being the surviving entity (the Merger), such that NuStar Energy will be the sole member of NuStar GP Holdings following the Merger. Pursuant to the Merger Agreement and at the effective time of the Merger, NuStar Energy’s partnership agreement will be amended and restated to, among other things, (i) cancel the incentive distribution rights held by our general partner, (ii) convert the 2% general partner interest in NuStar Energy held by our general partner into a non-economic management interest and (iii) provide the holders of our common units with voting rights in the election of the members of the board of directors of NuStar GP, LLC at an annual meeting, beginning in 2019. At the effective time of the Merger, each outstanding NuStar GP Holdings common unit, other than those held by NuStar GP Holdings or its subsidiaries, will be converted into the right to receive 0.55 of a NuStar Energy common unit. All NuStar GP Holdings common units, when converted, will cease to be outstanding and will automatically be cancelled and no longer exist. No fractional NuStar Energy common units will be issued in the Merger; instead, each holder of NuStar GP Holdings’ common units otherwise entitled to receive a fractional NuStar Energy common unit will receive cash in lieu thereof. Furthermore, the 10,214,626 NuStar Energy common units currently owned by subsidiaries of NuStar GP Holdings will be cancelled and will cease to exist. At the effective time of the Merger, each outstanding award of NuStar GP Holdings restricted units will be converted, on the same terms and conditions as were applicable to the awards immediately prior to the Merger, into an award of NuStar Energy restricted units. The number of NuStar Energy restricted units subject to the converted awards will be determined as provided in the Merger Agreement. Each of our executive officers and directors has agreed and acknowledged that the Merger will not be deemed to trigger a “change of control” as defined under any NuStar Energy or NuStar GP Holdings plan or award, and has waived any rights to vesting, payment or other benefit thereunder that would arise upon a “change of control,” to which he or she might otherwise have been entitled. The Merger Agreement contains customary representations and warranties and covenants by each of the parties. Completion of the Merger is conditioned upon, among other things: (i) approval of the Merger Agreement by the affirmative vote of holders of a Unit Majority, as defined in the Second Amended and Restated Limited Liability Company Agreement of NuStar GP Holdings, as amended; (ii) the effectiveness of a registration statement on Form S-4 with respect to the issuance by NuStar Energy of its common units in connection with the Merger; (iii) the absence of certain legal injunctions or impediments prohibiting the transactions; (iv) the receipt of certain tax opinions from a nationally recognized tax counsel; and (v) the approval for the listing of NuStar Energy’s common units to be issued in the Merger on the New York Stock Exchange. NuStar Energy entered into a Support Agreement, dated as of February 7, 2018 (the Support Agreement), with Merger Sub, WLG Holdings, LLC, a Texas limited liability company controlled by Mr. Greehey (WLG Holdings), Mr. Greehey (together, WLG Holdings and Mr. Greehey are referred to as the Greehey Unitholders), and, for limited purposes, NuStar GP Holdings, pursuant to which the Greehey Unitholders have agreed to vote in favor of the approval and adoption of the Merger Agreement, the approval of the Merger and any other action required in furtherance thereof submitted for the vote or written consent of NuStar GP Holdings unitholders. The Greehey Unitholders collectively own approximately 21% of the outstanding NuStar GP Holdings units. The Support Agreement will terminate (i) at the effective time of the Merger, (ii) upon the termination of the Merger Agreement as provided therein, or (iii) at such time as NuStar Energy and the Greehey Unitholders agree in writing to terminate the Support Agreement. After the Merger, the NuStar GP, LLC board of directors is expected to consist of nine members, initially composed of the six members of the NuStar GP, LLC board of directors and the three independent directors of the board of directors of NuStar GP Holdings. NuStar Energy filed a registration statement on Form S-4, as amended, with respect to the common units to be issued by NuStar Energy in connection with the Merger.

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS	3 Months Ended
	Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
NEW ACCOUNTING PRONOUNCEMENTS	NEW ACCOUNTING PRONOUNCEMENTS Comprehensive Income In February 2018, the Financial Accounting Standards Board (FASB) issued amended guidance which provides an entity the option to reclassify stranded tax effects caused by the Tax Cuts and Jobs Act of 2017 from accumulated other comprehensive income to retained earnings, and also requires certain additional disclosures about those stranded tax effects. The guidance is effective for annual and interim periods beginning after December 15, 2018, with early adoption permitted. The new requirements should be applied using one of two retrospective transition methods. We are currently evaluating whether we will adopt these provisions early, but we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures. Derivatives and Hedging In August 2017, the FASB issued amended guidance intended to improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. The amended guidance also makes certain targeted improvements to simplify the application of current hedge accounting guidance. The guidance is effective for annual and interim periods beginning after December 15, 2018, with early adoption permitted. Certain of the new requirements should be applied prospectively while others should be applied using a modified retrospective transition method. We currently expect to adopt the amended guidance on January 1, 2019. We do not expect the guidance to have a material impact on our financial position or results of operations, and we are assessing the impact on our disclosures. Defined Benefit Plans In March 2017, the FASB issued amended guidance that changes the presentation of net periodic pension cost related to defined benefit plans. Under the amended guidance, the service cost component of net periodic benefit cost will be presented in the same income statement line items as other current employee compensation costs, but the remaining components of net periodic benefit cost will be presented outside of operating income. The changes are effective for annual and interim periods beginning after December 15, 2017, and amendments should be applied retrospectively. We began reporting the remaining components of net periodic benefit cost in “Other income, net” in the consolidated statements of comprehensive income upon adoption of the amended guidance on January 1, 2018. We applied the amended guidance prospectively as it did not have a material impact on previous periods. Goodwill In January 2017, the FASB issued amended guidance that simplifies the accounting for goodwill impairment by eliminating step 2 of the goodwill impairment test. Under the amended guidance, goodwill impairment will be measured as the excess of the reporting unit’s carrying value over its fair value, not to exceed the carrying amount of goodwill for that reporting unit. The changes are effective for annual and interim periods beginning after December 15, 2019, and amendments should be applied prospectively. Early adoption is permitted for any impairment tests performed after January 1, 2017, and we are currently evaluating whether we will adopt these provisions early. Regardless of our decision, we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures. Credit Losses In June 2016, the FASB issued amended guidance that requires the use of a “current expected loss” model for financial assets measured at amortized cost and certain off-balance sheet credit exposures. Under this model, entities will be required to estimate the lifetime expected credit losses on such instruments based on historical experience, current conditions, and reasonable and supportable forecasts. This amended guidance also expands the disclosure requirements to enable users of financial statements to understand an entity’s assumptions, models and methods for estimating expected credit losses. The changes are effective for annual and interim periods beginning after December 15, 2019, and amendments should be applied using a modified retrospective approach. We currently expect to adopt the amended guidance on January 1, 2020 and are assessing the impact of this amended guidance on our financial position, results of operations and disclosures. We plan to provide additional information about the expected financial impact at a future date. 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. In January 2018, the FASB issued additional guidance that provides an optional transition practical expedient for land easements. We currently expect to adopt these provisions on January 1, 2019 using the modified retrospective approach of adoption. We are working to identify our lease arrangements and have begun the process of system implementation. We are continuing to evaluate the impact of this amended guidance on our financial position, results of operations, disclosures and internal controls and plan to provide additional information about the expected financial impact at a future date. Revenue Recognition In May 2014, the FASB and the International Accounting Standards Board jointly issued a comprehensive new revenue recognition standard that requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. The standard is effective for public entities for annual and interim periods beginning after December 15, 2017, using one of two retrospective transition methods. We adopted these provisions January 1, 2018 using the modified retrospective approach. The transition adjustment related to the adoption was immaterial, and we do not expect the adoption of this standard to materially impact the amount or timing of our revenue going forward. Please refer to Note 12 for further discussion.

ACQUISITIONS

ACQUISITIONS	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS Navigator Acquisition On April 11, 2017, we entered into a Membership Interest Purchase and Sale Agreement (the Acquisition Agreement) with FR Navigator Holdings LLC to acquire all of the issued and outstanding limited liability company interests in Navigator Energy Services, LLC (Navigator) for approximately $1.5 billion . We closed the Navigator Acquisition on May 4, 2017 . We acquired crude oil transportation, pipeline gathering and storage assets located in the Midland Basin of West Texas that we collectively refer to as our Permian Crude System. The assets acquired are included in our pipeline segment. The condensed consolidated statements of comprehensive income include the results of operations for Navigator commencing on May 4, 2017. We accounted for the Navigator Acquisition using the acquisition method. The following table reflects the final purchase price allocation: Purchase Price Allocation (Thousands of Dollars) Accounts receivable $ 4,747 Other current assets 2,359 Property, plant and equipment, net 376,690 Intangible assets (a) 700,000 Goodwill (b) 398,024 Other long-term assets, net 2,199 Current liabilities (22,300 ) Purchase price allocation, net of cash acquired $ 1,461,719 (a) Intangible assets, which consist of customer contracts and relationships, are amortized on a straight-line basis over a period of 20 years . (b) The goodwill acquired represents the expected benefit from entering new geographic areas and the anticipated opportunities to generate future cash flows from the assets acquired and potential future projects. The unaudited pro forma information for the three months ended March 31, 2017 presented below combines the historical financial information for Navigator and the Partnership for that period. The information assumes we completed the Navigator Acquisition on January 1, 2017 and the following: • we issued approximately 14.4 million common units; • we received a contribution from our general partner of $13.6 million to maintain its 2% interest; • we issued 15.4 million Series B Preferred Units; • we issued $550.0 million of 5.625% senior notes; • additional depreciation and amortization that would have been incurred assuming the fair value adjustments to property, plant and equipment and intangible assets reflected in the purchase price allocation above; and • we satisfied Navigator’s outstanding obligations under its revolving credit agreement. Three Months Ended March 31, 2017 (Thousands of Dollars, Except Per Unit Data) Revenues $ 497,384 Net income $ 42,448 Basic net income per common unit $ 0.19 The pro forma information for the three months ended March 31, 2017 does not include transaction costs of approximately $14.0 million , which were directly attributable to the Navigator Acquisition and paid in the second quarter of 2017. The pro forma information is unaudited and is not necessarily indicative of the results of operations that would have resulted had the Navigator Acquisition occurred on January 1, 2017 or that may result in the future.

DEBT

DEBT	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
DEBT	DEBT Revolving Credit Agreement On March 28, 2018, NuStar Logistics amended its $1.75 billion revolving credit agreement (the Revolving Credit Agreement), to increase the maximum allowed consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) to 5.25-to-1.00 for the rolling periods ending June 30, 2018 through December 31, 2018. Subsequently, the maximum allowed consolidated debt coverage ratio may not exceed 5.00-to-1.00 for any rolling periods ending on or after March 31, 2019. The Revolving Credit Agreement was also amended, to, among other things, change the definition of Change in Control in the Revolving Credit Agreement such that the proposed Merger discussed in Note 2 will not constitute a Change in Control for purposes of the Revolving Credit Agreement. 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, 2018 , letters of credit issued under the Revolving Credit Agreement totaled $3.7 million , and we had $804.9 million available for borrowing. As of March 31, 2018, our consolidated debt coverage ratio could not exceed 5.50-to-1.00. We believe that we are in compliance with the covenants in the Revolving Credit Agreement as of March 31, 2018 . During the three months ended March 31, 2018 , the balance under the Revolving Credit Agreement increased by $48.1 million . The Revolving Credit Agreement 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. In February 2018, Moody’s Investor Service Inc. (Moody’s) lowered our credit rating from Ba1 to Ba2. This rating downgrade caused the interest rate on our Revolving Credit Agreement to increase by 0.25% effective February 2018. As of March 31, 2018 , our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 3.6% , and we had $941.4 million outstanding. NuStar Logistics Senior Notes The credit rating downgrade by Moody’s in February 2018 increased the interest rate on our $350.0 million of 7.65% senior notes by 0.25% , resulting in an interest rate of 8.65% applicable to the interest payment due April 15, 2018. We repaid our $350.0 million of 7.65% senior notes due April 15, 2018 with borrowings under our Revolving Credit Agreement at maturity. NuStar Logistics Subordinated Notes Effective January 15, 2018, the interest rate on NuStar Logistics’ $402.5 million of fixed-to-floating rate subordinated notes due January 15, 2043 switched from a fixed annual rate of 7.625% , payable quarterly in arrears, to an annual rate equal to the sum of the three-month LIBOR rate for the related quarterly interest period, plus 6.734% payable quarterly, commencing with the interest payment due April 15, 2018. As of March 31, 2018 , the floating interest rate was 8.5% . 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 activity consists of purchasing receivables from NuStar Energy’s wholly owned subsidiaries that participate in the Securitization Program and providing these receivables as collateral for NuStar Finance’s revolving borrowings 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. The amendment to the Revolving Credit Agreement also limits the amount of borrowings under the Receivables Financing Agreement to $125.0 million . Borrowings by NuStar Finance under the Receivables Financing Agreement bear interest at the applicable bank rate, as defined under the Receivables Financing Agreement. The weighted average interest rate related to outstanding borrowings under the Securitization Program as of March 31, 2018 was 2.8% . As of March 31, 2018 , $91.8 million of our accounts receivable, net of allowance for doubtful accounts, are included in the Securitization Program. The amount of borrowings outstanding under the Receivables Financing Agreement totaled $57.8 million as of March 31, 2018 , which is included in “Long-term debt” on the consolidated balance sheet. On March 28, 2018, the Receivables Financing Agreement was amended to change the definition of Change in Control in the Receivables Financing Agreement such that the proposed Merger discussed in Note 2 will not be a Change in Control for purposes of the Receivables Financing Agreement.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES We have contingent liabilities resulting from various litigation, claims and commitments. We record accruals for loss contingencies when losses are considered probable and can be reasonably estimated. Legal fees associated with defending the Partnership in legal matters are expensed as incurred. We accrued $2.7 million for contingent losses as of March 31, 2018 and $7.3 million as of December 31, 2017 . The amount that will ultimately be paid related to such matters may differ from the recorded accruals, and the timing of such payments is uncertain. We evaluate each contingent loss at least quarterly, and more frequently as each matter progresses and develops over time, and we do not believe that the resolution of any particular claim or proceeding, or all matters in the aggregate, would have a material adverse effect on our results of operations, financial position or liquidity.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	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, 2018 Level 1 Level 2 Level 3 Total (Thousands of Dollars) Assets: Other current assets: Interest rate swaps $ — $ 5,547 $ — $ 5,547 Other long-term assets, net: Interest rate swaps — 2,307 — 2,307 Total $ — $ 7,854 $ — $ 7,854 Liabilities: Accrued liabilities: Commodity derivatives $ (257 ) $ — $ — $ (257 ) Interest rate swaps — (114 ) — (114 ) Other long-term liabilities: Interest rate swaps — (307 ) — (307 ) Total $ (257 ) $ (421 ) $ — $ (678 ) December 31, 2017 Level 1 Level 2 Level 3 Total (Thousands of Dollars) Assets: Other current assets: Product imbalances $ 3,890 $ — $ — $ 3,890 Liabilities: Accrued liabilities: Product imbalances $ (1,534 ) $ — $ — $ (1,534 ) Commodity derivatives (878 ) — — (878 ) Interest rate swaps — (5,394 ) — (5,394 ) Other long-term liabilities: Interest rate swaps — (4,594 ) — (4,594 ) Total $ (2,412 ) $ (9,988 ) $ — $ (12,400 ) Product Imbalances. Pursuant to the new revenue recognition standard we adopted January 1, 2018, we no longer recognize the fair value of product imbalances on our consolidated balance sheets. Prior to adoption, we valued our assets and liabilities related to product imbalances using quoted market prices in active markets as of the reporting date; accordingly, we included 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 had derivative instruments for which we determined fair value using industry pricing services and other observable inputs, such as quoted prices on an exchange for similar derivative instruments, and we included these derivative instruments in Level 2 of the fair value hierarchy. See Note 8 for a discussion of our derivative instruments. Interest Rate Swaps. Because 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, we include these interest rate swaps in Level 2 of the fair value hierarchy. Fair Value of Financial Instruments We recognize cash equivalents, receivables, payables and debt in our consolidated balance sheets at their carrying amounts. The fair values of these financial instruments, except for long-term debt, approximate their carrying amounts. The estimated fair values and carrying amounts of long-term debt, including the current portion, were as follows: March 31, 2018 December 31, 2017 (Thousands of Dollars) Fair value $ 3,665,335 $ 3,677,622 Carrying amount $ 3,656,066 $ 3,613,059 We estimated the fair value of our publicly traded notes based upon quoted prices in active markets; therefore, we determined that the fair value of our publicly traded notes falls in Level 1 of the fair value hierarchy. 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.

DERIVATIVES AND RISK MANAGEMENT

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES AND RISK MANAGEMENT ACTIVITIES	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 the three-month USD LIBOR . These swaps qualify as cash flow hedges, and we designate them as such. We record the effective portion of mark-to-market adjustments as a component of “Accumulated other comprehensive income (loss)” (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, 2018 and December 31, 2017 , the aggregate notional amount of forward-starting interest rate swaps totaled $600.0 million . In April 2018, in connection with the maturity of the 7.65% senior notes due April 15, 2018, we terminated forward-starting interest rate swaps with an aggregate notional amount of $350.0 million and received $8.0 million . Commodity Price Risk We are exposed to market risks related to the volatility of petroleum product prices. In order to reduce the risk of commodity price fluctuations with respect to our petroleum 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. We ceased marketing crude oil in the second quarter of 2017 and exited our heavy fuels trading operations in the third quarter of 2017, thereby reducing our overall hedging activity. 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 1.7 million barrels and 1.2 million barrels as of March 31, 2018 and December 31, 2017 , respectively. We had $0.4 million and $0.3 million of margin deposits as of March 31, 2018 and December 31, 2017 , respectively. 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, December 31, March 31, December 31, (Thousands of Dollars) Derivatives Designated as Hedging Instruments: Interest rate swaps Other current assets $ 5,547 $ — $ — $ — Interest rate swaps Other long-term assets, net 2,307 — — — Commodity contracts Accrued liabilities 20 — (33 ) (112 ) Interest rate swaps Accrued liabilities — — (114 ) (5,394 ) Interest rate swaps Other long-term liabilities — — (307 ) (4,594 ) Total 7,874 — (454 ) (10,100 ) Derivatives Not Designated as Hedging Instruments: Commodity contracts Accrued liabilities 759 742 (1,003 ) (1,508 ) Total Derivatives $ 8,633 $ 742 $ (1,457 ) $ (11,608 ) 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, December 31, (Thousands of Dollars) Net amounts of assets presented in the consolidated balance sheets $ — $ — Net amounts of liabilities presented in the consolidated balance sheets $ (257 ) $ (878 ) We recognize the impact of our commodity contracts on earnings in “Cost of product sales” on the condensed consolidated statements of comprehensive income, as follows: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Derivatives Designated as Fair Value Hedging Instruments: (Loss) gain recognized in income on derivative $ (296 ) $ 2,097 Gain (loss) recognized in income on hedged item 237 (1,834 ) (Loss) gain recognized in income for ineffective portion $ (59 ) $ 263 Derivatives Not Designated as Hedging Instruments: Loss recognized in income on derivative $ (141 ) $ (138 ) Our interest rate swaps had the following impact on earnings: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Derivatives Designated as Cash Flow Hedging Instruments: Gain recognized in other comprehensive income on derivative (effective portion) $ 17,421 $ 39 Loss reclassified from AOCI into interest expense, net (effective portion) $ (1,390 ) $ (1,799 ) As of March 31, 2018 , we expect to reclassify a loss of $4.8 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS Please refer to Note 2 for a discussion of the merger of a subsidiary of ours with and into NuStar GP Holdings, pursuant to which we will become the sole member of NuStar GP Holdings. We are a party to the 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 expire on March 1, 2020 and will automatically renew for successive two-year terms, unless terminated by either party.

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS 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. 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 Pension Plan and Excess Pension Plan are collectively referred to as the Pension Plans. 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. The components of net periodic benefit cost (income) related to our Pension Plans and other postretirement benefit plans were as follows: Pension Plans Other Postretirement Benefit Plans 2018 2017 2018 2017 (Thousands of Dollars) For the three months ended March 31: Service cost $ 2,406 $ 2,239 $ 126 $ 113 Interest cost 1,206 1,127 108 108 Expected return on assets (1,855 ) (1,603 ) — — Amortization of prior service credit (514 ) (515 ) (287 ) (286 ) Amortization of net loss 544 371 54 48 Net periodic benefit cost (income) $ 1,787 $ 1,619 $ 1 $ (17 )

PARTNERS' EQUITY

PARTNERS' EQUITY	3 Months Ended
	Mar. 31, 2018
Partners' Capital Notes [Abstract]
PARTNERS' EQUITY	PARTNERS' EQUITY Please refer to Note 2 for a discussion of the merger of a subsidiary of ours with and into NuStar GP Holdings, pursuant to which we will become the sole member of NuStar GP Holdings. Partners’ Equity Activity The following table summarizes changes to our partners’ equity (in thousands of dollars): Balance as of January 1, 2018 $ 2,480,089 Net income 126,133 Unit-based compensation 1,286 Other comprehensive income 20,924 Distributions to partners (131,262 ) Other (5,113 ) Balance as of March 31, 2018 $ 2,492,057 Cash Distributions General Partner and Common Limited Partners . We make quarterly distributions to common unitholders and the general partner of 100% of our available cash, generally defined as cash receipts less cash disbursements, including distributions to the 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (the Preferred Units), and cash reserves established by the general partner, in its sole discretion. These quarterly distributions are declared and paid within 45 days subsequent to each quarter-end. The common unitholders receive a distribution each quarter as determined by the board of directors, subject to limitation by the distributions in arrears, if any, on the Preferred Units. Our available cash is distributed based on the percentages shown below: Percentage of Distribution Quarterly Distribution Amount per Common Unit Common Unitholders General Partner Including Incentive Distributions Up to $0.60 98% 2% Above $0.60 up to $0.66 90% 10% Above $0.66 75% 25% On April 26, 2018, we announced that the board of directors of NuStar GP, LLC reset our quarterly distribution per common unit to $0.60 ( $2.40 on an annualized basis), starting with the first-quarter distribution payable on May 14, 2018. The following table reflects the allocation of total cash distributions to the general partner and common limited partners applicable to the period in which the distributions were earned: Three Months Ended March 31, 2018 2017 (Thousands of Dollars, Except Per Unit Data) General partner interest $ 1,141 $ 2,343 General partner incentive distribution — 12,912 Total general partner distribution 1,141 15,255 Common limited partners’ distribution 55,916 101,913 Total cash distributions $ 57,057 $ 117,168 Cash distributions per unit applicable to common limited partners $ 0.60 $ 1.095 The following table summarizes information about our quarterly cash distributions to our general partner and common limited partners: Quarter Ended Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) March 31, 2018 $ 0.600 $ 57,057 May 8, 2018 May 14, 2018 December 31, 2017 $ 1.095 $ 115,267 February 8, 2018 February 13, 2018 Preferred Units. The following table summarizes information about our quarterly cash distributions on our Preferred Units: Period Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) Series A Preferred Units: March 15, 2018 - June 14, 2018 $ 0.53125 $ 4,813 June 1, 2018 June 15, 2018 December 15, 2017 - March 14, 2018 $ 0.53125 $ 4,813 March 1, 2018 March 15, 2018 Series B Preferred Units: March 15, 2018 to June 14, 2018 $ 0.47657 $ 7,339 June 1, 2018 June 15, 2018 December 15, 2017 to March 14, 2018 $ 0.47657 $ 7,339 March 1, 2018 March 15, 2018 Series C Preferred Units: March 15, 2018 to June 14, 2018 $ 0.56250 $ 3,881 June 1, 2018 June 15, 2018 November 30, 2017 - March 14, 2018 $ 0.65625 $ 4,528 March 1, 2018 March 15, 2018 Allocations of Net Income Our partnership agreement sets forth the calculation to be used to determine the amount and priority of cash distributions that the unitholders and general partner will receive. The partnership agreement also contains provisions for the allocation of net income to the unitholders and the general partner. Our net income for each quarterly reporting period is first allocated to the preferred limited partner unitholders in an amount equal to the earned distributions for the respective reporting period and then to the general partner in an amount equal to the general partner’s incentive distribution calculated based upon the declared distribution for the respective reporting period. We allocate the remaining net income or loss among the common unitholders ( 98% ) and general partner ( 2% ), as set forth in our partnership agreement. As a result of the distribution declared for the first quarter of 2018 of $0.60 per common unit (discussed above), the general partner did not receive an incentive distribution. The following table details the calculation of net income applicable to the general partner: Three Months Ended March 31, 2018 2017 (Thousands of Dollars, Except Percentage Data) Net income attributable to NuStar Energy L.P. $ 126,133 $ 57,940 Less preferred limited partner interest 15,990 4,813 Less general partner incentive distribution — 12,912 Net income after preferred limited partner interest and general partner incentive distribution 110,143 40,215 General partner interest allocation 2 % 2 % General partner interest allocation of net income 2,203 804 General partner incentive distribution — 12,912 Net income applicable to general partner $ 2,203 $ 13,716 Accumulated Other Comprehensive Income (Loss) The balance of and changes in the components included in AOCI were as follows: Foreign Currency Translation Cash Flow Hedges Pension and Other Postretirement Benefits Total (Thousands of Dollars) Balance as of January 1, 2018 $ (51,603 ) $ (24,304 ) $ (9,020 ) $ (84,927 ) Other comprehensive income (loss): Other comprehensive income before reclassification adjustments 2,312 17,421 — 19,733 Net gain on pension costs reclassified into other income, net — — (203 ) (203 ) Net loss on cash flow hedges reclassified into interest expense, net — 1,390 — 1,390 Other 60 — (56 ) 4 Other comprehensive income (loss) 2,372 18,811 (259 ) 20,924 Balance as of March 31, 2018 $ (49,231 ) $ (5,493 ) $ (9,279 ) $ (64,003 )

REVENUE FROM CONTRACTS WITH CUS

REVENUE FROM CONTRACTS WITH CUSTOMERS	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	REVENUE FROM CONTRACTS WITH CUSTOMERS Transition On January 1, 2018, we adopted Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (ASC Topic 606) using the modified retrospective method and applying ASC Topic 606 to all revenue contracts with customers. Results for reporting periods beginning after January 1, 2018 are presented under ASC Topic 606. In accordance with the modified retrospective approach, prior period amounts were not adjusted and are reported under ASC Topic 605, “Revenue Recognition.” The adoption of ASC Topic 606 affected our consolidated statement of comprehensive income for the three months ended March 31, 2018 as follows: As Reported Without Adoption of ASC Topic 606 Effect of Change Higher/(Lower) (Thousands of Dollars) Revenues $ 475,881 $ 481,786 $ (5,905 ) Operating income $ 98,480 $ 104,385 $ (5,905 ) Net income $ 126,133 $ 132,038 $ (5,905 ) Basic net income per common unit $ 1.15 $ 1.21 $ (0.06 ) Revenue-Generating Activities Revenues for the pipeline segment are derived from interstate and intrastate pipeline transportation of refined products, crude oil and anhydrous ammonia and the applicable pipeline tariff. Revenues for the storage segment include fees for tank storage agreements, whereby a customer agrees to pay for a certain amount of storage in a tank over a period of time (storage terminal revenues), and throughput agreements, whereby a customer pays a fee per barrel for volumes moving through our terminals (throughput terminal revenues). Our terminals also provide blending, additive injections, handling and filtering services for which we charge additional fees, and certain of our facilities charge fees to provide marine services such as pilotage, tug assistance, line handling, launch service, emergency response services and other ship services (all of which are considered optional services). Revenues for the fuels marketing segment are derived from the sale of petroleum products. Within our pipeline and storage segments, we provide services on an uninterruptible and interruptible basis. Uninterruptible services within our pipeline segment typically result from contracts that contain take-or-pay minimum volume commitments (MVCs) from the customer. Contracts with MVCs obligate the customer to pay for that minimum amount. If a customer fails to meet its MVC for the applicable service period, the customer is obligated to pay a deficiency fee based upon the shortfall between the actual volumes transported or stored and the MVC for that service period (deficiency payments). In exchange, those contracts with MVCs obligate us to stand ready to transport volumes up to the customer’s MVC. Within our storage segment, uninterruptible services arise from contracts containing a fixed monthly fee for the portion of storage capacity reserved by the customer. These contracts require the customer to pay the fixed monthly fee, regardless of whether or not it uses our storage facility (i.e., take-or-pay obligation), while we are committed to stand ready to store that volume. Interruptible services within our pipeline and storage segments are generally provided when and to the extent we determine the requested capacity is available. The customer typically pays a per-unit rate for the actual quantities of services it receives. Revenue Recognition After identifying a contract with a customer, ASC Topic 606 requires us to (i) identify the performance obligations in the contract; (ii) determine the transaction price; (iii) allocate the transaction price to the performance obligations; and (iv) recognize revenue when or as we satisfy a performance obligation. For the majority of our contracts, we recognize revenue in the amount to which we have a right to invoice. Generally, payment terms do not exceed 30 days. Performance Obligations. The majority of our contracts contain a single performance obligation. For our pipeline segment, the single performance obligation encompasses multiple activities necessary to deliver our customers’ products to their destinations. Typically, we satisfy this performance obligation over time as the product volume is delivered in or out of the pipelines. Similarly, the performance obligation for our storage segment consists of multiple activities necessary to receive, store and deliver our customers’ products. We typically satisfy this performance obligation over time as the product volume is delivered in or out of the tanks (for throughput terminal revenues) or with the passage of time (for storage terminal revenues). Certain of our pipeline segment customer contracts include an incentive pricing structure, which provides a discounted rate for the remainder of the contract once the customer exceeds a cumulative volume. The ability to receive discounted future services represents a material right to the customer, which results in a second performance obligation in those contracts. Product sales contracts associated with our fuels marketing segment generally include a single performance obligation to deliver specified volumes of a commodity, which we satisfy at a point in time, when the product is delivered and the customer obtains control of the commodity. Optional services do not provide a material right to the customer, and are not considered a separate performance obligation in the contract. If and when a customer elects an optional service, it becomes part of the existing performance obligation. Transaction Price. For uninterruptible services, we determine the transaction price at contract inception based on the guaranteed minimum amount of revenue over the term of the contract. For interruptible services and optional services, we determine the transaction price based on our right to invoice the customer for the value of services provided to the customer for the applicable period. In certain instances, our customers reimburse us for capital projects, also referred to as contributions in aid of construction (CIAC), typically as upfront payments for future services, which are included in the transaction price of the underlying service contract. We collect taxes on certain revenue transactions to be remitted to governmental authorities, which may include sales, use, value-added and some excise taxes. These taxes are not included in the transaction price and are, therefore, excluded from revenues. Allocation of Transaction Price. We allocate the transaction price to the single performance obligation that exists in the vast majority of our contracts with customers. For the few contracts that have a second performance obligation, such as those that include an incentive pricing structure, we calculate an average rate based on the estimated total volumes to be delivered over the term of the contract and the resulting estimated total revenue to be billed using the applicable rates in the contract. We allocate the transaction price to the two performance obligations by applying the average rate to product volumes as they are delivered to the customer over the term of the contract. Determining the timing and amount of volumes subject to these incentive pricing contracts requires judgment that can impact the amount of revenue allocated to the two separate performance obligations. We base our estimates on our analysis of expected future production information available from our customers or other sources, which we update at least quarterly. Some of our MVC contracts include provisions that allow the customer to apply deficiency payments to future service periods (the carryforward period). In those instances, we have not satisfied our performance obligation as we still have the obligation to perform those services, subject to contractual and/or capacity constraints, at the customer’s request. At least quarterly, we assess the customer’s ability to utilize any deficiency payments during the carryforward period. If we receive a deficiency payment from a customer that we expect the customer to utilize during the carryforward period, we defer that amount as a contract liability. We will consider the performance obligation satisfied and allocate any deferred deficiency payments to our performance obligation when the customer utilizes the deficiency payment, the carryforward period ends or we determine the customer cannot or will not utilize the deficiency payment (i.e. breakage). If our contract does not allow the customer to apply deficiency payments to future service periods, we allocate the deficiency payment to the already satisfied portion of the performance obligation. Contract Assets and Liabilities The following table provides information about contract assets and contract liabilities from contracts with customers: Contract Assets Contract Liabilities (Thousands of Dollars) Balance as of January 1, 2018 $ 2,127 $ (57,870 ) Additions 460 (2,386 ) Transfer to accounts receivable (1,653 ) — Transfer to revenues — 2,935 Total activity (1,193 ) 549 Balance as of March 31, 2018 934 (57,321 ) Less current portion 749 (13,579 ) Noncurrent portion $ 185 $ (43,742 ) Contract assets relate to performance obligations satisfied in advance of scheduled billings. Current contract assets are included in “Other current assets” and noncurrent contract assets are included in “Other long-term assets, net” on the consolidated balance sheet. Contract liabilities relate to payments received in advance of satisfying performance obligations under a contract, which result from contracts with MVCs, contracts with an incentive pricing structure and CIAC payments. Current contract liabilities are included in “Accrued liabilities” and noncurrent contract liabilities are included in “Other long-term liabilities” on the consolidated balance sheet. Remaining Performance Obligations The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of March 31, 2018 (in thousands of dollars): 2018 (remaining) $ 377,456 2019 348,414 2020 202,526 2021 141,957 2022 105,769 Thereafter 333,881 Total $ 1,510,003 Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to service customer contracts which have fixed pricing and fixed volume terms and conditions, generally including contracts with minimum volume commitment payment obligations. Disaggregation of Revenue The following table disaggregates our revenues: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Pipeline segment: Crude oil pipelines (excluding lessor revenues) $ 53,437 $ 36,747 Refined products and ammonia pipelines 83,299 84,493 Total pipeline segment revenues from contracts with customers 136,736 121,240 Lessor revenues 54 — Total pipeline segment revenues 136,790 121,240 Storage segment: Throughput terminals 20,016 20,690 Storage terminals (excluding lessor revenues) 125,350 116,960 Total storage segment revenues from contracts with customers 145,366 137,650 Lessor revenues 9,962 9,781 Total storage segment revenues 155,328 147,431 Fuels marketing segment revenues from contracts with customers 185,838 222,702 Consolidation and intersegment eliminations: (2,075 ) (3,943 ) Total revenues $ 475,881 $ 487,430

NET INCOME PER COMMON UNIT

NET INCOME PER COMMON UNIT	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
NET INCOME PER COMMON UNIT	NET INCOME PER COMMON UNIT Basic net income per common unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partners and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include our general partner interest and restricted units awarded under our long-term incentive plan. We compute basic net income per common unit by dividing net income attributable to common units by the weighted-average number of common units outstanding during the period. The following table details the calculation of net income per common unit: Three Months Ended March 31, 2018 2017 (Thousands of Dollars, Except Unit and Per Unit Data) Net income attributable to NuStar Energy L.P. $ 126,133 $ 57,940 Less: Distributions to preferred limited partners 15,990 4,813 Less: Distributions to general partner (including incentive distribution rights) 1,141 15,255 Less: Distributions to common limited partners 55,916 101,913 Less: Distribution equivalent rights to restricted units 445 715 Distributions less than (in excess of) earnings $ 52,641 $ (64,756 ) Net income attributable to common units: Distributions to common limited partners $ 55,916 $ 101,913 Allocation of distributions less than (in excess of) earnings 51,148 (63,461 ) Total $ 107,064 $ 38,452 Basic weighted-average common units outstanding 93,181,781 78,642,888 Basic net income per common unit $ 1.15 $ 0.49

STATEMENTS OF CASH FLOWS

STATEMENTS OF CASH FLOWS	3 Months Ended
	Mar. 31, 2018
Statement of Cash Flows [Abstract]
STATEMENTS OF CASH FLOWS	STATEMENTS OF CASH FLOWS Changes in current assets and current liabilities were as follows: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Decrease (increase) in current assets: Accounts receivable $ 19,525 $ 3,544 Receivable from related party 133 237 Inventories (2,687 ) 1,658 Other current assets 3,224 307 Increase (decrease) in current liabilities: Accounts payable (7,681 ) (12,154 ) Accrued interest payable 3,552 (6,301 ) Accrued liabilities (6,019 ) (21,006 ) Taxes other than income tax (1,558 ) (2,752 ) Income tax payable 2,202 (2,675 ) Changes in current assets and current liabilities $ 10,691 $ (39,142 ) The above changes in current assets and current liabilities differ from changes between amounts reflected in the applicable consolidated balance sheets due to: • current assets and current liabilities acquired during the period; • the change in the amount accrued for capital expenditures; • the effect of foreign currency translation; and • changes in the fair values of our interest rate swap agreements. Cash flows related to interest and income taxes were as follows: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Cash paid for interest, net of amount capitalized $ 42,549 $ 42,146 Cash paid for income taxes, net of tax refunds received $ 2,635 $ 4,828

SEGMENT INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION Our reportable business segments consist of the pipeline, storage and fuels marketing segments. Our segments represent strategic business units that offer different services and products. We evaluate the performance of each segment based on its respective operating income, before general and administrative expenses and certain non-segmental depreciation and amortization expense. General and administrative expenses are not allocated to the operating segments since those expenses relate primarily to the overall management at the entity level. Our principal operations include the transportation of petroleum products and anhydrous ammonia, and the terminalling, storage and marketing of petroleum products. Intersegment revenues result from storage agreements with wholly owned subsidiaries of NuStar Energy at rates consistent with the rates charged to third parties for storage. Results of operations for the reportable segments were as follows: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Revenues: Pipeline $ 136,790 $ 121,240 Storage: Third parties 153,253 143,488 Intersegment 2,075 3,943 Total storage 155,328 147,431 Fuels marketing 185,838 222,702 Consolidation and intersegment eliminations (2,075 ) (3,943 ) Total revenues $ 475,881 $ 487,430 Operating income: Pipeline $ 57,794 $ 65,028 Storage 56,261 53,759 Fuels marketing 6,320 5,140 Consolidation and intersegment eliminations (3 ) — Total segment operating income 120,372 123,927 General and administrative expenses 19,774 24,595 Other depreciation and amortization expense 2,118 2,193 Total operating income $ 98,480 $ 97,139 Total assets by reportable segment were as follows: March 31, December 31, (Thousands of Dollars) Pipeline $ 3,516,435 $ 3,492,417 Storage 2,761,667 2,735,563 Fuels marketing 121,489 118,746 Total segment assets 6,399,591 6,346,726 Other partnership assets 187,122 188,507 Total consolidated assets $ 6,586,713 $ 6,535,233

CONDENSED CONSOLIDATING FINANCI

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS	3 Months Ended
	Mar. 31, 2018
CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]
CONDENSED CONSOLIDATING FINANCIAL STATEMENTS	CONDENSED CONSOLIDATING FINANCIAL STATEMENTS NuStar Energy has no operations, and its assets consist mainly of its 100% indirectly owned subsidiaries, NuStar Logistics and NuPOP. 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, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 858 $ 26 $ — $ 14,244 $ — $ 15,128 Receivables, net — 623 — 156,718 — 157,341 Inventories — 1,844 11,039 16,666 — 29,549 Other current assets 139 13,905 3,538 8,397 — 25,979 Intercompany receivable — 3,132,310 — — (3,132,310 ) — Total current assets 997 3,148,708 14,577 196,025 (3,132,310 ) 227,997 Property, plant and equipment, net — 1,874,347 585,056 1,927,821 — 4,387,224 Intangible assets, net — 56,174 — 715,449 — 771,623 Goodwill — 149,453 170,652 774,556 — 1,094,661 Investment in wholly owned subsidiaries 2,881,187 19,795 1,413,835 851,975 (5,166,792 ) — Other long-term assets, net 303 70,343 27,204 7,358 — 105,208 Total assets $ 2,882,487 $ 5,318,820 $ 2,211,324 $ 4,473,184 $ (8,299,102 ) $ 6,586,713 Liabilities and Partners’ Equity Accounts payable $ 3,309 $ 19,472 $ 5,232 $ 94,027 $ — $ 122,040 Short-term debt — 70,000 — — — 70,000 Current portion of long-term debt — 349,973 — — — 349,973 Accrued interest payable — 43,921 — 53 — 43,974 Accrued liabilities 655 11,579 8,214 27,072 — 47,520 Taxes other than income tax 206 3,906 5,246 3,393 — 12,751 Income tax payable — 902 4 5,472 — 6,378 Intercompany payable 322,257 — 1,326,659 1,483,394 (3,132,310 ) — Total current liabilities 326,427 499,753 1,345,355 1,613,411 (3,132,310 ) 652,636 Long-term debt, less current portion — 3,248,763 — 57,330 — 3,306,093 Deferred income tax liability — 1,262 12 21,758 — 23,032 Other long-term liabilities — 43,854 14,191 54,850 — 112,895 Total partners’ equity 2,556,060 1,525,188 851,766 2,725,835 (5,166,792 ) 2,492,057 Total liabilities and partners’ equity $ 2,882,487 $ 5,318,820 $ 2,211,324 $ 4,473,184 $ (8,299,102 ) $ 6,586,713 Condensed Consolidating Balance Sheets December 31, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 885 $ 29 $ — $ 23,378 $ — $ 24,292 Receivables, net — 280 — 176,495 — 176,775 Inventories — 1,686 8,611 16,560 — 26,857 Other current assets 61 11,412 4,191 6,844 — 22,508 Intercompany receivable — 3,112,164 — — (3,112,164 ) — Total current assets 946 3,125,571 12,802 223,277 (3,112,164 ) 250,432 Property, plant and equipment, net — 1,893,720 591,070 1,816,143 — 4,300,933 Intangible assets, net — 58,530 — 725,949 — 784,479 Goodwill — 149,453 170,652 777,370 — 1,097,475 Investment in wholly owned subsidiaries 2,891,371 24,162 1,301,717 790,882 (5,008,132 ) — Deferred income tax asset — — — 233 — 233 Other long-term assets, net 303 65,684 27,493 8,201 — 101,681 Total assets $ 2,892,620 $ 5,317,120 $ 2,103,734 $ 4,342,055 $ (8,120,296 ) $ 6,535,233 Liabilities and Partners’ Equity Accounts payable $ 4,078 $ 27,642 $ 13,160 $ 101,052 $ — $ 145,932 Short-term debt — 35,000 — — — 35,000 Current portion of long-term debt — 349,990 — — — 349,990 Accrued interest payable — 40,402 — 47 — 40,449 Accrued liabilities 1,105 17,628 9,450 33,395 — 61,578 Taxes other than income tax 125 7,110 3,794 3,356 — 14,385 Income tax payable — 732 4 3,436 — 4,172 Intercompany payable 322,296 — 1,277,691 1,512,177 (3,112,164 ) — Total current liabilities 327,604 478,504 1,304,099 1,653,463 (3,112,164 ) 651,506 Long-term debt, less current portion — 3,201,220 — 61,849 — 3,263,069 Deferred income tax liability — 1,262 12 20,998 — 22,272 Other long-term liabilities — 58,806 8,861 50,630 — 118,297 Total partners’ equity 2,565,016 1,577,328 790,762 2,555,115 (5,008,132 ) 2,480,089 Total liabilities and partners’ equity $ 2,892,620 $ 5,317,120 $ 2,103,734 $ 4,342,055 $ (8,120,296 ) $ 6,535,233 Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended March 31, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 119,694 $ 56,274 $ 300,115 $ (202 ) $ 475,881 Costs and expenses 612 72,416 35,181 269,394 (202 ) 377,401 Operating (loss) income (612 ) 47,278 21,093 30,721 — 98,480 Equity in earnings (loss) of subsidiaries 126,713 (2,249 ) 112,003 131,639 (368,106 ) — Interest income (expense), net 32 (50,026 ) (1,571 ) 3,793 — (47,772 ) Other income, net — 476 115 79,161 — 79,752 Income (loss) before income tax expense 126,133 (4,521 ) 131,640 245,314 (368,106 ) 130,460 Income tax expense — 170 1 4,156 — 4,327 Net income (loss) $ 126,133 $ (4,691 ) $ 131,639 $ 241,158 $ (368,106 ) $ 126,133 Comprehensive income $ 126,133 $ 14,120 $ 131,639 $ 243,271 $ (368,106 ) $ 147,057 Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended March 31, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 123,629 $ 52,241 $ 311,847 $ (287 ) $ 487,430 Costs and expenses 509 76,322 29,806 283,941 (287 ) 390,291 Operating (loss) income (509 ) 47,307 22,435 27,906 — 97,139 Equity in earnings of subsidiaries 58,445 1,110 26,215 47,353 (133,123 ) — Interest income (expense), net 4 (36,914 ) (1,304 ) 1,800 — (36,414 ) Other income, net — 21 6 113 — 140 Income before income tax expense 57,940 11,524 47,352 77,172 (133,123 ) 60,865 Income tax expense — 331 1 2,593 — 2,925 Net income $ 57,940 $ 11,193 $ 47,351 $ 74,579 $ (133,123 ) $ 57,940 Comprehensive income $ 57,940 $ 13,031 $ 47,351 $ 76,504 $ (133,123 ) $ 61,703 Condensed Consolidating Statements of Cash Flows For the Three Months Ended March 31, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 130,847 $ 16,855 $ 25,112 $ 148,287 $ (197,937 ) $ 123,164 Cash flows from investing activities: Capital expenditures — (6,815 ) (2,440 ) (128,619 ) — (137,874 ) Change in accounts payable related to capital expenditures — (1,946 ) (5,700 ) (4,372 ) — (12,018 ) Proceeds from sale or disposition of assets — 6 4 9 — 19 Proceeds from insurance recoveries — — — 78,419 — 78,419 Net cash used in investing activities — (8,755 ) (8,136 ) (54,563 ) — (71,454 ) Cash flows from financing activities: Debt borrowings — 348,411 — 1,300 — 349,711 Debt repayments — (268,621 ) — (5,800 ) — (274,421 ) Distributions to preferred unitholders (16,680 ) (8,341 ) (8,340 ) (8,340 ) 25,021 (16,680 ) Distributions to common unitholders and general partner (115,272 ) (57,636 ) (57,635 ) (57,645 ) 172,916 (115,272 ) Net intercompany activity 2,053 (18,769 ) 48,999 (32,283 ) — — Other, net (975 ) (3,147 ) — (62 ) — (4,184 ) Net cash used in financing activities (130,874 ) (8,103 ) (16,976 ) (102,830 ) 197,937 (60,846 ) Effect of foreign exchange rate changes on cash — — — (28 ) — (28 ) Net decrease in cash and cash equivalents (27 ) (3 ) — (9,134 ) — (9,164 ) Cash and cash equivalents as of the beginning of the period 885 29 — 23,378 — 24,292 Cash and cash equivalents as of the end of the period $ 858 $ 26 $ — $ 14,244 $ — $ 15,128 Condensed Consolidating Statements of Cash Flows For the Three Months Ended March 31, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 103,517 $ 35,964 $ 23,855 $ 78,004 $ (157,360 ) $ 83,980 Cash flows from investing activities: Capital expenditures — (7,671 ) (1,761 ) (36,300 ) — (45,732 ) Change in accounts payable related to capital expenditures — (4,908 ) (1,103 ) (809 ) — (6,820 ) Proceeds from sale or disposition of assets — 1,833 6 20 — 1,859 Proceeds from Axeon term loan — 110,000 — — — 110,000 Net cash provided by (used in) investing activities — 99,254 (2,858 ) (37,089 ) — 59,307 Cash flows from financing activities: Debt borrowings — 404,166 — 6,100 — 410,266 Debt repayments — (451,694 ) — (3,500 ) — (455,194 ) Distributions to preferred unitholders (5,883 ) (2,941 ) (2,941 ) (2,942 ) 8,824 (5,883 ) Distributions to common unitholders and general partner (99,021 ) (49,511 ) (49,511 ) (49,514 ) 148,536 (99,021 ) Net intercompany activity 3,196 (34,952 ) 31,455 301 — — Other, net (1,933 ) (285 ) — — — (2,218 ) Net cash used in financing activities (103,641 ) (135,217 ) (20,997 ) (49,555 ) 157,360 (152,050 ) Effect of foreign exchange rate changes on cash — — — 26 — 26 Net (decrease) increase in cash and cash equivalents (124 ) 1 — (8,614 ) — (8,737 ) Cash and cash equivalents as of the beginning of the period 870 5 — 35,067 — 35,942 Cash and cash equivalents as of the end of the period $ 746 $ 6 $ — $ 26,453 $ — $ 27,205

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table reflects the final purchase price allocation: Purchase Price Allocation (Thousands of Dollars) Accounts receivable $ 4,747 Other current assets 2,359 Property, plant and equipment, net 376,690 Intangible assets (a) 700,000 Goodwill (b) 398,024 Other long-term assets, net 2,199 Current liabilities (22,300 ) Purchase price allocation, net of cash acquired $ 1,461,719 (a) Intangible assets, which consist of customer contracts and relationships, are amortized on a straight-line basis over a period of 20 years . (b) The goodwill acquired represents the expected benefit from entering new geographic areas and the anticipated opportunities to generate future cash flows from the assets acquired and potential future projects.
Business Acquisition, Pro Forma Information [Table Text Block]	The unaudited pro forma information for the three months ended March 31, 2017 presented below combines the historical financial information for Navigator and the Partnership for that period. The information assumes we completed the Navigator Acquisition on January 1, 2017 and the following: • we issued approximately 14.4 million common units; • we received a contribution from our general partner of $13.6 million to maintain its 2% interest; • we issued 15.4 million Series B Preferred Units; • we issued $550.0 million of 5.625% senior notes; • additional depreciation and amortization that would have been incurred assuming the fair value adjustments to property, plant and equipment and intangible assets reflected in the purchase price allocation above; and • we satisfied Navigator’s outstanding obligations under its revolving credit agreement. Three Months Ended March 31, 2017 (Thousands of Dollars, Except Per Unit Data) Revenues $ 497,384 Net income $ 42,448 Basic net income per common unit $ 0.19

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 Level 1 Level 2 Level 3 Total (Thousands of Dollars) Assets: Other current assets: Interest rate swaps $ — $ 5,547 $ — $ 5,547 Other long-term assets, net: Interest rate swaps — 2,307 — 2,307 Total $ — $ 7,854 $ — $ 7,854 Liabilities: Accrued liabilities: Commodity derivatives $ (257 ) $ — $ — $ (257 ) Interest rate swaps — (114 ) — (114 ) Other long-term liabilities: Interest rate swaps — (307 ) — (307 ) Total $ (257 ) $ (421 ) $ — $ (678 ) December 31, 2017 Level 1 Level 2 Level 3 Total (Thousands of Dollars) Assets: Other current assets: Product imbalances $ 3,890 $ — $ — $ 3,890 Liabilities: Accrued liabilities: Product imbalances $ (1,534 ) $ — $ — $ (1,534 ) Commodity derivatives (878 ) — — (878 ) Interest rate swaps — (5,394 ) — (5,394 ) Other long-term liabilities: Interest rate swaps — (4,594 ) — (4,594 ) Total $ (2,412 ) $ (9,988 ) $ — $ (12,400 )
Fair Value and Carrying Value of Debt and Note Receivable [Table Text Block]	The estimated fair values and carrying amounts of long-term debt, including the current portion, were as follows: March 31, 2018 December 31, 2017 (Thousands of Dollars) Fair value $ 3,665,335 $ 3,677,622 Carrying amount $ 3,656,066 $ 3,613,059

DERIVATIVES AND RISK MANAGEME24

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES (Tables)	3 Months Ended
	Mar. 31, 2018
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, December 31, March 31, December 31, (Thousands of Dollars) Derivatives Designated as Hedging Instruments: Interest rate swaps Other current assets $ 5,547 $ — $ — $ — Interest rate swaps Other long-term assets, net 2,307 — — — Commodity contracts Accrued liabilities 20 — (33 ) (112 ) Interest rate swaps Accrued liabilities — — (114 ) (5,394 ) Interest rate swaps Other long-term liabilities — — (307 ) (4,594 ) Total 7,874 — (454 ) (10,100 ) Derivatives Not Designated as Hedging Instruments: Commodity contracts Accrued liabilities 759 742 (1,003 ) (1,508 ) Total Derivatives $ 8,633 $ 742 $ (1,457 ) $ (11,608 )
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, December 31, (Thousands of Dollars) Net amounts of assets presented in the consolidated balance sheets $ — $ — Net amounts of liabilities presented in the consolidated balance sheets $ (257 ) $ (878 )
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block]	We recognize the impact of our commodity contracts on earnings in “Cost of product sales” on the condensed consolidated statements of comprehensive income, as follows: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Derivatives Designated as Fair Value Hedging Instruments: (Loss) gain recognized in income on derivative $ (296 ) $ 2,097 Gain (loss) recognized in income on hedged item 237 (1,834 ) (Loss) gain recognized in income for ineffective portion $ (59 ) $ 263 Derivatives Not Designated as Hedging Instruments: Loss recognized in income on derivative $ (141 ) $ (138 ) Our interest rate swaps had the following impact on earnings: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Derivatives Designated as Cash Flow Hedging Instruments: Gain recognized in other comprehensive income on derivative (effective portion) $ 17,421 $ 39 Loss reclassified from AOCI into interest expense, net (effective portion) $ (1,390 ) $ (1,799 )

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	The components of net periodic benefit cost (income) related to our Pension Plans and other postretirement benefit plans were as follows: Pension Plans Other Postretirement Benefit Plans 2018 2017 2018 2017 (Thousands of Dollars) For the three months ended March 31: Service cost $ 2,406 $ 2,239 $ 126 $ 113 Interest cost 1,206 1,127 108 108 Expected return on assets (1,855 ) (1,603 ) — — Amortization of prior service credit (514 ) (515 ) (287 ) (286 ) Amortization of net loss 544 371 54 48 Net periodic benefit cost (income) $ 1,787 $ 1,619 $ 1 $ (17 )

PARTNERS' EQUITY (Tables)

PARTNERS' EQUITY (Tables)	3 Months Ended
	Mar. 31, 2018
Distributions Made to Limited Partners and General Partner [Line Items]
Schedule of Changes in Partners' Equity [Table Text Block]	The following table summarizes changes to our partners’ equity (in thousands of dollars): Balance as of January 1, 2018 $ 2,480,089 Net income 126,133 Unit-based compensation 1,286 Other comprehensive income 20,924 Distributions to partners (131,262 ) Other (5,113 ) Balance as of March 31, 2018 $ 2,492,057
Schedule of Distribution Waterfall [Table Text Block]	Our available cash is distributed based on the percentages shown below: Percentage of Distribution Quarterly Distribution Amount per Common Unit Common Unitholders General Partner Including Incentive Distributions Up to $0.60 98% 2% Above $0.60 up to $0.66 90% 10% Above $0.66 75% 25%
Schedule of Distributions To General and Common Limited Partners [Table Text Block]	The following table reflects the allocation of total cash distributions to the general partner and common limited partners applicable to the period in which the distributions were earned: Three Months Ended March 31, 2018 2017 (Thousands of Dollars, Except Per Unit Data) General partner interest $ 1,141 $ 2,343 General partner incentive distribution — 12,912 Total general partner distribution 1,141 15,255 Common limited partners’ distribution 55,916 101,913 Total cash distributions $ 57,057 $ 117,168 Cash distributions per unit applicable to common limited partners $ 0.60 $ 1.095
Distributions Made to Common Limited and General Partners, by Distribution [Table Text Block]	The following table summarizes information about our quarterly cash distributions to our general partner and common limited partners: Quarter Ended Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) March 31, 2018 $ 0.600 $ 57,057 May 8, 2018 May 14, 2018 December 31, 2017 $ 1.095 $ 115,267 February 8, 2018 February 13, 2018
Schedule of Calculation of Net Income Applicable to General Partner [Table Text Block]	The following table details the calculation of net income applicable to the general partner: Three Months Ended March 31, 2018 2017 (Thousands of Dollars, Except Percentage Data) Net income attributable to NuStar Energy L.P. $ 126,133 $ 57,940 Less preferred limited partner interest 15,990 4,813 Less general partner incentive distribution — 12,912 Net income after preferred limited partner interest and general partner incentive distribution 110,143 40,215 General partner interest allocation 2 % 2 % General partner interest allocation of net income 2,203 804 General partner incentive distribution — 12,912 Net income applicable to general partner $ 2,203 $ 13,716
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, 2018 $ (51,603 ) $ (24,304 ) $ (9,020 ) $ (84,927 ) Other comprehensive income (loss): Other comprehensive income before reclassification adjustments 2,312 17,421 — 19,733 Net gain on pension costs reclassified into other income, net — — (203 ) (203 ) Net loss on cash flow hedges reclassified into interest expense, net — 1,390 — 1,390 Other 60 — (56 ) 4 Other comprehensive income (loss) 2,372 18,811 (259 ) 20,924 Balance as of March 31, 2018 $ (49,231 ) $ (5,493 ) $ (9,279 ) $ (64,003 )
Preferred Limited Partner [Member]
Distributions Made to Limited Partners and General Partner [Line Items]
Distributions Made to Limited Partner, by Distribution [Table Text Block]	The following table summarizes information about our quarterly cash distributions on our Preferred Units: Period Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) Series A Preferred Units: March 15, 2018 - June 14, 2018 $ 0.53125 $ 4,813 June 1, 2018 June 15, 2018 December 15, 2017 - March 14, 2018 $ 0.53125 $ 4,813 March 1, 2018 March 15, 2018 Series B Preferred Units: March 15, 2018 to June 14, 2018 $ 0.47657 $ 7,339 June 1, 2018 June 15, 2018 December 15, 2017 to March 14, 2018 $ 0.47657 $ 7,339 March 1, 2018 March 15, 2018 Series C Preferred Units: March 15, 2018 to June 14, 2018 $ 0.56250 $ 3,881 June 1, 2018 June 15, 2018 November 30, 2017 - March 14, 2018 $ 0.65625 $ 4,528 March 1, 2018 March 15, 2018

REVENUE FROM CONTRACTS WITH C27

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Schedule of Adoption of New Accounting Pronouncements [Table Text Block]	The adoption of ASC Topic 606 affected our consolidated statement of comprehensive income for the three months ended March 31, 2018 as follows: As Reported Without Adoption of ASC Topic 606 Effect of Change Higher/(Lower) (Thousands of Dollars) Revenues $ 475,881 $ 481,786 $ (5,905 ) Operating income $ 98,480 $ 104,385 $ (5,905 ) Net income $ 126,133 $ 132,038 $ (5,905 ) Basic net income per common unit $ 1.15 $ 1.21 $ (0.06 )
Contract with Customer, Asset and Liability [Table Text Block]	The following table provides information about contract assets and contract liabilities from contracts with customers: Contract Assets Contract Liabilities (Thousands of Dollars) Balance as of January 1, 2018 $ 2,127 $ (57,870 ) Additions 460 (2,386 ) Transfer to accounts receivable (1,653 ) — Transfer to revenues — 2,935 Total activity (1,193 ) 549 Balance as of March 31, 2018 934 (57,321 ) Less current portion 749 (13,579 ) Noncurrent portion $ 185 $ (43,742 )
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of March 31, 2018 (in thousands of dollars): 2018 (remaining) $ 377,456 2019 348,414 2020 202,526 2021 141,957 2022 105,769 Thereafter 333,881 Total $ 1,510,003
Disaggregation of Revenue [Table Text Block]	The following table disaggregates our revenues: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Pipeline segment: Crude oil pipelines (excluding lessor revenues) $ 53,437 $ 36,747 Refined products and ammonia pipelines 83,299 84,493 Total pipeline segment revenues from contracts with customers 136,736 121,240 Lessor revenues 54 — Total pipeline segment revenues 136,790 121,240 Storage segment: Throughput terminals 20,016 20,690 Storage terminals (excluding lessor revenues) 125,350 116,960 Total storage segment revenues from contracts with customers 145,366 137,650 Lessor revenues 9,962 9,781 Total storage segment revenues 155,328 147,431 Fuels marketing segment revenues from contracts with customers 185,838 222,702 Consolidation and intersegment eliminations: (2,075 ) (3,943 ) Total revenues $ 475,881 $ 487,430

NET INCOME PER COMMON UNIT (Tab

NET INCOME PER COMMON UNIT (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Net Income Per Common Unit	The following table details the calculation of net income per common unit: Three Months Ended March 31, 2018 2017 (Thousands of Dollars, Except Unit and Per Unit Data) Net income attributable to NuStar Energy L.P. $ 126,133 $ 57,940 Less: Distributions to preferred limited partners 15,990 4,813 Less: Distributions to general partner (including incentive distribution rights) 1,141 15,255 Less: Distributions to common limited partners 55,916 101,913 Less: Distribution equivalent rights to restricted units 445 715 Distributions less than (in excess of) earnings $ 52,641 $ (64,756 ) Net income attributable to common units: Distributions to common limited partners $ 55,916 $ 101,913 Allocation of distributions less than (in excess of) earnings 51,148 (63,461 ) Total $ 107,064 $ 38,452 Basic weighted-average common units outstanding 93,181,781 78,642,888 Basic net income per common unit $ 1.15 $ 0.49

STATEMENTS OF CASH FLOWS (Table

STATEMENTS OF CASH FLOWS (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 2017 (Thousands of Dollars) Decrease (increase) in current assets: Accounts receivable $ 19,525 $ 3,544 Receivable from related party 133 237 Inventories (2,687 ) 1,658 Other current assets 3,224 307 Increase (decrease) in current liabilities: Accounts payable (7,681 ) (12,154 ) Accrued interest payable 3,552 (6,301 ) Accrued liabilities (6,019 ) (21,006 ) Taxes other than income tax (1,558 ) (2,752 ) Income tax payable 2,202 (2,675 ) Changes in current assets and current liabilities $ 10,691 $ (39,142 )
Schedule of Supplemental Cash Flow Information [Text Block]	Cash flows related to interest and income taxes were as follows: Three Months Ended March 31, 2018 2017 (Thousands of Dollars) Cash paid for interest, net of amount capitalized $ 42,549 $ 42,146 Cash paid for income taxes, net of tax refunds received $ 2,635 $ 4,828

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 2017 (Thousands of Dollars) Revenues: Pipeline $ 136,790 $ 121,240 Storage: Third parties 153,253 143,488 Intersegment 2,075 3,943 Total storage 155,328 147,431 Fuels marketing 185,838 222,702 Consolidation and intersegment eliminations (2,075 ) (3,943 ) Total revenues $ 475,881 $ 487,430 Operating income: Pipeline $ 57,794 $ 65,028 Storage 56,261 53,759 Fuels marketing 6,320 5,140 Consolidation and intersegment eliminations (3 ) — Total segment operating income 120,372 123,927 General and administrative expenses 19,774 24,595 Other depreciation and amortization expense 2,118 2,193 Total operating income $ 98,480 $ 97,139
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	Total assets by reportable segment were as follows: March 31, December 31, (Thousands of Dollars) Pipeline $ 3,516,435 $ 3,492,417 Storage 2,761,667 2,735,563 Fuels marketing 121,489 118,746 Total segment assets 6,399,591 6,346,726 Other partnership assets 187,122 188,507 Total consolidated assets $ 6,586,713 $ 6,535,233

CONDENSED CONSOLIDATING FINAN31

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Tables)	3 Months Ended
	Mar. 31, 2018
CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]
Condensed Consolidating Balance Sheets [Text Block]	Condensed Consolidating Balance Sheets March 31, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 858 $ 26 $ — $ 14,244 $ — $ 15,128 Receivables, net — 623 — 156,718 — 157,341 Inventories — 1,844 11,039 16,666 — 29,549 Other current assets 139 13,905 3,538 8,397 — 25,979 Intercompany receivable — 3,132,310 — — (3,132,310 ) — Total current assets 997 3,148,708 14,577 196,025 (3,132,310 ) 227,997 Property, plant and equipment, net — 1,874,347 585,056 1,927,821 — 4,387,224 Intangible assets, net — 56,174 — 715,449 — 771,623 Goodwill — 149,453 170,652 774,556 — 1,094,661 Investment in wholly owned subsidiaries 2,881,187 19,795 1,413,835 851,975 (5,166,792 ) — Other long-term assets, net 303 70,343 27,204 7,358 — 105,208 Total assets $ 2,882,487 $ 5,318,820 $ 2,211,324 $ 4,473,184 $ (8,299,102 ) $ 6,586,713 Liabilities and Partners’ Equity Accounts payable $ 3,309 $ 19,472 $ 5,232 $ 94,027 $ — $ 122,040 Short-term debt — 70,000 — — — 70,000 Current portion of long-term debt — 349,973 — — — 349,973 Accrued interest payable — 43,921 — 53 — 43,974 Accrued liabilities 655 11,579 8,214 27,072 — 47,520 Taxes other than income tax 206 3,906 5,246 3,393 — 12,751 Income tax payable — 902 4 5,472 — 6,378 Intercompany payable 322,257 — 1,326,659 1,483,394 (3,132,310 ) — Total current liabilities 326,427 499,753 1,345,355 1,613,411 (3,132,310 ) 652,636 Long-term debt, less current portion — 3,248,763 — 57,330 — 3,306,093 Deferred income tax liability — 1,262 12 21,758 — 23,032 Other long-term liabilities — 43,854 14,191 54,850 — 112,895 Total partners’ equity 2,556,060 1,525,188 851,766 2,725,835 (5,166,792 ) 2,492,057 Total liabilities and partners’ equity $ 2,882,487 $ 5,318,820 $ 2,211,324 $ 4,473,184 $ (8,299,102 ) $ 6,586,713 Condensed Consolidating Balance Sheets December 31, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 885 $ 29 $ — $ 23,378 $ — $ 24,292 Receivables, net — 280 — 176,495 — 176,775 Inventories — 1,686 8,611 16,560 — 26,857 Other current assets 61 11,412 4,191 6,844 — 22,508 Intercompany receivable — 3,112,164 — — (3,112,164 ) — Total current assets 946 3,125,571 12,802 223,277 (3,112,164 ) 250,432 Property, plant and equipment, net — 1,893,720 591,070 1,816,143 — 4,300,933 Intangible assets, net — 58,530 — 725,949 — 784,479 Goodwill — 149,453 170,652 777,370 — 1,097,475 Investment in wholly owned subsidiaries 2,891,371 24,162 1,301,717 790,882 (5,008,132 ) — Deferred income tax asset — — — 233 — 233 Other long-term assets, net 303 65,684 27,493 8,201 — 101,681 Total assets $ 2,892,620 $ 5,317,120 $ 2,103,734 $ 4,342,055 $ (8,120,296 ) $ 6,535,233 Liabilities and Partners’ Equity Accounts payable $ 4,078 $ 27,642 $ 13,160 $ 101,052 $ — $ 145,932 Short-term debt — 35,000 — — — 35,000 Current portion of long-term debt — 349,990 — — — 349,990 Accrued interest payable — 40,402 — 47 — 40,449 Accrued liabilities 1,105 17,628 9,450 33,395 — 61,578 Taxes other than income tax 125 7,110 3,794 3,356 — 14,385 Income tax payable — 732 4 3,436 — 4,172 Intercompany payable 322,296 — 1,277,691 1,512,177 (3,112,164 ) — Total current liabilities 327,604 478,504 1,304,099 1,653,463 (3,112,164 ) 651,506 Long-term debt, less current portion — 3,201,220 — 61,849 — 3,263,069 Deferred income tax liability — 1,262 12 20,998 — 22,272 Other long-term liabilities — 58,806 8,861 50,630 — 118,297 Total partners’ equity 2,565,016 1,577,328 790,762 2,555,115 (5,008,132 ) 2,480,089 Total liabilities and partners’ equity $ 2,892,620 $ 5,317,120 $ 2,103,734 $ 4,342,055 $ (8,120,296 ) $ 6,535,233
Condensed Consolidating Statements of Comprehensive Income (Loss) [Table Text Block]	Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended March 31, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 119,694 $ 56,274 $ 300,115 $ (202 ) $ 475,881 Costs and expenses 612 72,416 35,181 269,394 (202 ) 377,401 Operating (loss) income (612 ) 47,278 21,093 30,721 — 98,480 Equity in earnings (loss) of subsidiaries 126,713 (2,249 ) 112,003 131,639 (368,106 ) — Interest income (expense), net 32 (50,026 ) (1,571 ) 3,793 — (47,772 ) Other income, net — 476 115 79,161 — 79,752 Income (loss) before income tax expense 126,133 (4,521 ) 131,640 245,314 (368,106 ) 130,460 Income tax expense — 170 1 4,156 — 4,327 Net income (loss) $ 126,133 $ (4,691 ) $ 131,639 $ 241,158 $ (368,106 ) $ 126,133 Comprehensive income $ 126,133 $ 14,120 $ 131,639 $ 243,271 $ (368,106 ) $ 147,057 Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended March 31, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 123,629 $ 52,241 $ 311,847 $ (287 ) $ 487,430 Costs and expenses 509 76,322 29,806 283,941 (287 ) 390,291 Operating (loss) income (509 ) 47,307 22,435 27,906 — 97,139 Equity in earnings of subsidiaries 58,445 1,110 26,215 47,353 (133,123 ) — Interest income (expense), net 4 (36,914 ) (1,304 ) 1,800 — (36,414 ) Other income, net — 21 6 113 — 140 Income before income tax expense 57,940 11,524 47,352 77,172 (133,123 ) 60,865 Income tax expense — 331 1 2,593 — 2,925 Net income $ 57,940 $ 11,193 $ 47,351 $ 74,579 $ (133,123 ) $ 57,940 Comprehensive income $ 57,940 $ 13,031 $ 47,351 $ 76,504 $ (133,123 ) $ 61,703
Condensed Consolidating Statements of Cash Flows [Text Block]	Condensed Consolidating Statements of Cash Flows For the Three Months Ended March 31, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 130,847 $ 16,855 $ 25,112 $ 148,287 $ (197,937 ) $ 123,164 Cash flows from investing activities: Capital expenditures — (6,815 ) (2,440 ) (128,619 ) — (137,874 ) Change in accounts payable related to capital expenditures — (1,946 ) (5,700 ) (4,372 ) — (12,018 ) Proceeds from sale or disposition of assets — 6 4 9 — 19 Proceeds from insurance recoveries — — — 78,419 — 78,419 Net cash used in investing activities — (8,755 ) (8,136 ) (54,563 ) — (71,454 ) Cash flows from financing activities: Debt borrowings — 348,411 — 1,300 — 349,711 Debt repayments — (268,621 ) — (5,800 ) — (274,421 ) Distributions to preferred unitholders (16,680 ) (8,341 ) (8,340 ) (8,340 ) 25,021 (16,680 ) Distributions to common unitholders and general partner (115,272 ) (57,636 ) (57,635 ) (57,645 ) 172,916 (115,272 ) Net intercompany activity 2,053 (18,769 ) 48,999 (32,283 ) — — Other, net (975 ) (3,147 ) — (62 ) — (4,184 ) Net cash used in financing activities (130,874 ) (8,103 ) (16,976 ) (102,830 ) 197,937 (60,846 ) Effect of foreign exchange rate changes on cash — — — (28 ) — (28 ) Net decrease in cash and cash equivalents (27 ) (3 ) — (9,134 ) — (9,164 ) Cash and cash equivalents as of the beginning of the period 885 29 — 23,378 — 24,292 Cash and cash equivalents as of the end of the period $ 858 $ 26 $ — $ 14,244 $ — $ 15,128 Condensed Consolidating Statements of Cash Flows For the Three Months Ended March 31, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 103,517 $ 35,964 $ 23,855 $ 78,004 $ (157,360 ) $ 83,980 Cash flows from investing activities: Capital expenditures — (7,671 ) (1,761 ) (36,300 ) — (45,732 ) Change in accounts payable related to capital expenditures — (4,908 ) (1,103 ) (809 ) — (6,820 ) Proceeds from sale or disposition of assets — 1,833 6 20 — 1,859 Proceeds from Axeon term loan — 110,000 — — — 110,000 Net cash provided by (used in) investing activities — 99,254 (2,858 ) (37,089 ) — 59,307 Cash flows from financing activities: Debt borrowings — 404,166 — 6,100 — 410,266 Debt repayments — (451,694 ) — (3,500 ) — (455,194 ) Distributions to preferred unitholders (5,883 ) (2,941 ) (2,941 ) (2,942 ) 8,824 (5,883 ) Distributions to common unitholders and general partner (99,021 ) (49,511 ) (49,511 ) (49,514 ) 148,536 (99,021 ) Net intercompany activity 3,196 (34,952 ) 31,455 301 — — Other, net (1,933 ) (285 ) — — — (2,218 ) Net cash used in financing activities (103,641 ) (135,217 ) (20,997 ) (49,555 ) 157,360 (152,050 ) Effect of foreign exchange rate changes on cash — — — 26 — 26 Net (decrease) increase in cash and cash equivalents (124 ) 1 — (8,614 ) — (8,737 ) Cash and cash equivalents as of the beginning of the period 870 5 — 35,067 — 35,942 Cash and cash equivalents as of the end of the period $ 746 $ 6 $ — $ 26,453 $ — $ 27,205

ORGANIZATION AND BASIS OF PRE32

ORGANIZATION AND BASIS OF PRESENTATION Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2018USD ($)	Mar. 31, 2018USD ($)
Organization and Operations [Abstract]
Common limited partner ownership interest held by general partner		11.00%
Number of business segments		3
Unusual or Infrequent Item, or Both [Line Items]
Insurance proceeds	$ 87.5
Other Nonoperating Income (Expense) [Member]
Unusual or Infrequent Item, or Both [Line Items]
Gain from insurance proceeds		$ 78.8
Business Interruption Loss From Hurricane [Member]
Unusual or Infrequent Item, or Both [Line Items]
Insurance proceeds		$ 9.1

MERGER AGREEMENT Narrative (Det

MERGER AGREEMENT Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Feb. 07, 2018
Business Combinations [Abstract]
General partner ownership interest	2.00%	2.00%
Common unit conversion rate			55.00%
NuStar Energy common units owned by NuStar GP Holdings	10,214,626
Greehey Unitholders ownership interest			21.00%

ACQUISITIONS Narrative 1 (Detai

ACQUISITIONS Narrative 1 (Details) $ in Billions	May 04, 2017USD ($)
Navigator Acquisition [Member]
Business Acquisition [Line Items]
Purchase price of Navigator Acquisition	$ 1.5

ACQUISITIONS Table 1 - Navigato

ACQUISITIONS Table 1 - Navigator Acquisition Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands	May 04, 2017	Mar. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 1,094,661	$ 1,097,475
Navigator Acquisition [Member]
Business Acquisition [Line Items]
Accounts receivable	$ 4,747
Other current assets	2,359
Property, plant and equipment, net	376,690
Intangible assets	700,000
Goodwill	398,024
Other long-term assets, net	2,199
Current liabilities	(22,300)
Purchase price allocation, net of cash acquired	$ 1,461,719
Intangible assets, weighted average useful life (years)	20 years

ACQUISITIONS Narrative 2 (Detai

ACQUISITIONS Narrative 2 (Details) - USD ($) $ in Millions	Apr. 28, 2017	Apr. 18, 2017	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
General partner ownership interest			2.00%	2.00%
Common Limited Partner [Member]
Business Acquisition [Line Items]
Issuance of units (units)		14,375,000
General Partner [Member]
Business Acquisition [Line Items]
Net proceeds from issuance of units		$ 13.6
General partner ownership interest			2.00%
Series B Preferred Limited Partner [Member]
Business Acquisition [Line Items]
Issuance of units (units)	15,400,000
Logistics Notes Due 2027 [Member]
Business Acquisition [Line Items]
Senior notes issued	$ 550
Stated interest rate	5.625%

ACQUISITIONS Table 2 - Navigato

ACQUISITIONS Table 2 - Navigator Pro Forma Information (Details) - Navigator Acquisition [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)$ / shares
Business Acquisition [Line Items]
Revenues	$ 497,384
Net income	$ 42,448
Basic net income per common unit | $ / shares	$ 0.19

ACQUISITIONS Narrative 3 (Detai

ACQUISITIONS Narrative 3 (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017USD ($)
Navigator Acquisition [Member]
Business Acquisition [Line Items]
Business acquisition, transaction costs	$ 14

DEBT Narrative (Details)

DEBT Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Feb. 28, 2018	Mar. 31, 2018	Jan. 15, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt		$ 3,656,066		$ 3,613,059
$1.75 billion revolving credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,750,000
Covenant terms		the maximum allowed consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) to 5.25-to-1.00 for the rolling periods ending June 30, 2018 through December 31, 2018. Subsequently, the maximum allowed consolidated debt coverage ratio may not exceed 5.00-to-1.00 for any rolling periods ending on or after March 31, 2019. As of March 31, 2018, our consolidated debt coverage ratio could not exceed 5.50-to-1.00.
Letters of credit issued		$ 3,700
Current remaining borrowing capacity		804,900
Line of credit facility, increase, net		$ 48,100
Interest rate increase	0.25%
Interest rate at period end - Revolving Credit Agreement		3.60%
Long-term debt		$ 941,400
Logistics Notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate increase	0.25%
Long-term debt		$ 350,000
Stated interest rate		7.65%
Interest rate at period end		8.65%
Logisitics Notes due 2043 [Member]
Debt Instrument [Line Items]
Long-term debt		$ 402,500
Stated interest rate			7.625%
Interest rate at period end		8.50%
Interest rate terms		an annual rate equal to the sum of the three-month LIBOR rate for the related quarterly interest period, plus 6.734% payable quarterly, commencing with the interest payment due April 15, 2018.
Receivables Financing Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 125,000
Long-term debt		$ 57,800
Weighted average interest rate		2.80%
Collateral amount		$ 91,800

COMMITMENTS AND CONTINGENCIES N

COMMITMENTS AND CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Loss contingency accrual, at carrying value	$ 2.7	$ 7.3

FAIR VALUE MEASUREMENTS Table 1

FAIR VALUE MEASUREMENTS Table 1 - Recurring Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Total assets	$ 7,854
Liabilities:
Total liabilities	(678)	$ (12,400)
Fair Value Level 1
Assets:
Total assets	0
Liabilities:
Total liabilities	(257)	(2,412)
Fair Value Level 2
Assets:
Total assets	7,854
Liabilities:
Total liabilities	(421)	(9,988)
Fair Value Level 3
Assets:
Total assets	0
Liabilities:
Total liabilities	0	0
Other current assets
Assets:
Interest rate swaps - assets	5,547
Product imbalances - asset		3,890
Other current assets | Fair Value Level 1
Assets:
Interest rate swaps - assets	0
Product imbalances - asset		3,890
Other current assets | Fair Value Level 2
Assets:
Interest rate swaps - assets	5,547
Product imbalances - asset		0
Other current assets | Fair Value Level 3
Assets:
Interest rate swaps - assets	0
Product imbalances - asset		0
Other long-term assets, net
Assets:
Interest rate swaps - assets	2,307
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	2,307
Other long-term assets, net | Fair Value Level 3
Assets:
Interest rate swaps - assets	0
Accrued liabilities
Liabilities:
Product imbalances - liability		(1,534)
Commodity derivatives - liabilities	(257)	(878)
Interest rate swaps - liabilities	(114)	(5,394)
Accrued liabilities | Fair Value Level 1
Liabilities:
Product imbalances - liability		(1,534)
Commodity derivatives - liabilities	(257)	(878)
Interest rate swaps - liabilities	0	0
Accrued liabilities | Fair Value Level 2
Liabilities:
Product imbalances - liability		0
Commodity derivatives - liabilities	0	0
Interest rate swaps - liabilities	(114)	(5,394)
Accrued liabilities | Fair Value Level 3
Liabilities:
Product imbalances - liability		0
Commodity derivatives - liabilities	0	0
Interest rate swaps - liabilities	0	0
Other long-term liabilities
Liabilities:
Interest rate swaps - liabilities	(307)	(4,594)
Other long-term liabilities | Fair Value Level 1
Liabilities:
Interest rate swaps - liabilities	0	0
Other long-term liabilities | Fair Value Level 2
Liabilities:
Interest rate swaps - liabilities	(307)	(4,594)
Other long-term liabilities | Fair Value Level 3
Liabilities:
Interest rate swaps - liabilities	$ 0	$ 0

FAIR VALUE MEASUREMENTS Table 2

FAIR VALUE MEASUREMENTS Table 2 - Estimated Fair Values and Carrying Amounts of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair value, long-term debt	$ 3,665,335	$ 3,677,622
Carrying amount, long-term debt	$ 3,656,066	$ 3,613,059

DERIVATIVES AND RISK MANAGEME43

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Narrative (Details) bbl in Millions	Mar. 31, 2018USD ($)bbl	Dec. 31, 2017USD ($)bbl	Apr. 30, 2018USD ($)	Mar. 31, 2018USD ($)
Derivative [Line Items]
Margin deposit	$ 400,000	$ 300,000		$ 400,000
Interest rate swaps | Cash Flow Hedges
Derivative [Line Items]
Interest rate swaps interest rate received				receive a rate based on the three-month USD LIBOR
Notional amount of forward-starting interest rate swaps	$ 600,000,000	$ 600,000,000		$ 600,000,000
Commodity contracts
Derivative [Line Items]
Notional amount of commodity contracts, volume (in barrels) | bbl	1.7	1.2
Logistics Notes due 2018 [Member]
Derivative [Line Items]
Stated interest rate	7.65%			7.65%
Subsequent Event [Member]
Derivative [Line Items]
Cash received from termination of interest rate swaps			$ 8,000,000
Subsequent Event [Member] | Interest rate swaps | Cash Flow Hedges
Derivative [Line Items]
Notional amount of forward-starting interest rate swaps terminated			$ 350,000,000

DERIVATIVES AND RISK MANAGEME44

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 - Fair Values of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value
Asset Derivatives	$ 8,633	$ 742
Liability Derivatives	(1,457)	(11,608)
Designated as Hedging Instruments
Derivatives, Fair Value
Asset Derivatives	7,874	0
Liability Derivatives	(454)	(10,100)
Designated as Hedging Instruments | Commodity contracts | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	20	0
Liability Derivatives	(33)	(112)
Designated as Hedging Instruments | Interest rate swaps | Other current assets
Derivatives, Fair Value
Asset Derivatives	5,547	0
Liability Derivatives	0	0
Designated as Hedging Instruments | Interest rate swaps | Other long-term assets, net
Derivatives, Fair Value
Asset Derivatives	2,307	0
Liability Derivatives	0	0
Designated as Hedging Instruments | Interest rate swaps | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	(114)	(5,394)
Designated as Hedging Instruments | Interest rate swaps | Other long-term liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	(307)	(4,594)
Not Designated as Hedging Instruments | Commodity contracts | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	759	742
Liability Derivatives	$ (1,003)	$ (1,508)

DERIVATIVES AND RISK MANAGEME45

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 2 - Derivative Instruments Eligible for Offset (Details) - Commodity contracts - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Assets and Liabilities Eligible for Offset, Net [Line Items]
Net amounts of assets presented in the consolidated balance sheets	$ 0	$ 0
Net amounts of liabilities presented in the consolidated balance sheets	$ (257)	$ (878)

DERIVATIVES AND RISK MANAGEME46

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 3 - Impact of Derivatives on Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss)
Gain (loss) to be reclassified during next 12 months, forward-starting interest rate swaps	$ (4,800)
Designated as Hedging Instruments | Fair Value Hedges | Commodity contracts | Cost of product sales
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income on derivative	(296)	$ 2,097
Gain (loss) recognized in income on hedged item	237	(1,834)
Gain (loss) recognized in income for ineffective portion	(59)	263
Designated as Hedging Instruments | Cash Flow Hedges | Interest rate swaps | Other comprehensive income
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in other comprehensive income on derivative (effective portion)	17,421	39
Designated as Hedging Instruments | Cash Flow Hedges | Interest rate swaps | Interest expense, net
Derivative Instruments, Gain (Loss)
Gain (loss) reclassified from AOCI into interest expense, net (effective portion)	(1,390)	(1,799)
Not Designated as Hedging Instruments | Commodity contracts | Cost of product sales
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income on derivative	$ (141)	$ (138)

RELATED PARTY TRANSACTIONS Narr

RELATED PARTY TRANSACTIONS Narrative (Details)	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
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. The Amended GP Services Agreement will expire on March 1, 2020 and will automatically renew for successive two-year terms, unless terminated by either party.

EMPLOYEE BENEFIT PLANS Table 1

EMPLOYEE BENEFIT PLANS Table 1 - Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,406	$ 2,239
Interest cost	1,206	1,127
Expected return on assets	(1,855)	(1,603)
Amortization of prior service credit	(514)	(515)
Amortization of net loss	544	371
Net periodic benefit cost (income)	1,787	1,619
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	126	113
Interest cost	108	108
Expected return on assets	0	0
Amortization of prior service credit	(287)	(286)
Amortization of net loss	54	48
Net periodic benefit cost (income)	$ 1	$ (17)

PARTNERS' EQUITY Table 1 - Chan

PARTNERS' EQUITY Table 1 - Changes to Partners' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as of January 1, 2018	$ 2,480,089
Net income (loss)	126,133	$ 57,940
Unit-based compensation	1,286
Other comprehensive income	20,924
Distributions to partners	(131,262)
Other	(5,113)
Balance as of March 31, 2018	$ 2,492,057

PARTNERS' EQUITY Narrative 1 (D

PARTNERS' EQUITY Narrative 1 (Details)	3 Months Ended
	Mar. 31, 2018
Class of Stock [Line Items]
Percent of available cash distributed	100.00%
Number of days within which distribution Is paid to common unitholder and general partner	45
Series A Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units distribution percentage	8.50%
Series B Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units distribution percentage	7.625%
Series C Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units distribution percentage	9.00%

PARTNERS' EQUITY Table 2 - Gene

PARTNERS' EQUITY Table 2 - General Partner Incentive Distributions (Details)	3 Months Ended
	Mar. 31, 2018
General Partner Including Incentive Distributions [Member] | Quarterly Distributions Level 1 [Member]
Distribution Allocation [Line Items]
Percentage of distribution allocated to the general partner	2.00%
General Partner Including Incentive Distributions [Member] | Quarterly Distributions Level 2 [Member]
Distribution Allocation [Line Items]
Percentage of distribution allocated to the general partner	10.00%
General Partner Including Incentive Distributions [Member] | Quarterly Distributions Level 3 [Member]
Distribution Allocation [Line Items]
Percentage of distribution allocated to the general partner	25.00%
Common Limited Partner [Member] | Quarterly Distributions Level 1 [Member]
Distribution Allocation [Line Items]
Quarterly distribution amount per common unit	Up to $0.60
Percentage of distribution allocated to common limited partners	98.00%
Common Limited Partner [Member] | Quarterly Distributions Level 2 [Member]
Distribution Allocation [Line Items]
Quarterly distribution amount per common unit	Above $0.60 up to $0.66
Percentage of distribution allocated to common limited partners	90.00%
Common Limited Partner [Member] | Quarterly Distributions Level 3 [Member]
Distribution Allocation [Line Items]
Quarterly distribution amount per common unit	$0.66
Percentage of distribution allocated to common limited partners	75.00%

PARTNERS' EQUITY Table 3 - Cash

PARTNERS' EQUITY Table 3 - Cash Distributions Earned - General and Common Limited Partners (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Distributions Made to Limited Partners and General Partner [Line Items]
General partner interest	$ 1,141		$ 2,343
General partner incentive distribution	0		12,912
Total general partner distribution	1,141		15,255
Common limited partners’ distribution	55,916		101,913
Total cash distributions applicable to common limited partners and general partner	$ 57,057	$ 115,267	$ 117,168
Common Limited Partner [Member]
Distributions Made to Limited Partners and General Partner [Line Items]
Quarterly distribution annualized to common limited partners per unit	$ 2.40
Cash distributions per unit applicable to common limited partners	$ 0.60	$ 1.095	$ 1.095

PARTNERS' EQUITY Table 4 - Cash

PARTNERS' EQUITY Table 4 - Cash Distributions Paid - General and Common Limited Partners (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Distribution Made to General and Common Limited Partners [Line Items]
Cash distributions applicable to common limited partners and general partner (distribution earned)	$ 57,057	$ 115,267	$ 117,168
Common Limited Partner [Member]
Distribution Made to General and Common Limited Partners [Line Items]
Cash distributions per unit applicable to common limited partners	$ 0.60	$ 1.095	$ 1.095
Distribution date of record (distribution earned)	May 8, 2018	Feb. 8, 2018
Distribution payment date (distribution earned)	May 14, 2018	Feb. 13, 2018

PARTNERS' EQUITY Table 5 - Cash

PARTNERS' EQUITY Table 5 - Cash Distributions - Preferred Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018
Series A Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution paid		$ 0.53125
Cash distributions applicable to preferred limited partners		$ 4,813
Distribution date of record		Mar. 1, 2018
Distribution payment date		Mar. 15, 2018
Series B Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution paid		$ 0.47657
Cash distributions applicable to preferred limited partners		$ 7,339
Distribution date of record		Mar. 1, 2018
Distribution payment date		Mar. 15, 2018
Series C Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution paid		$ 0.65625
Cash distributions applicable to preferred limited partners		$ 4,528
Distribution date of record		Mar. 1, 2018
Distribution payment date		Mar. 15, 2018
Subsequent Event [Member] | Series A Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution declared	$ 0.53125
Cash distributions applicable to preferred limited partners	$ 4,813
Distribution date of record	Jun. 1, 2018
Distribution payment date	Jun. 15, 2018
Subsequent Event [Member] | Series B Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution declared	$ 0.47657
Cash distributions applicable to preferred limited partners	$ 7,339
Distribution date of record	Jun. 1, 2018
Distribution payment date	Jun. 15, 2018
Subsequent Event [Member] | Series C Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution declared	$ 0.5625
Cash distributions applicable to preferred limited partners	$ 3,881
Distribution date of record	Jun. 1, 2018
Distribution payment date	Jun. 15, 2018

PARTNERS' EQUITY Narrative 2 (D

PARTNERS' EQUITY Narrative 2 (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Class of Stock [Line Items]
General partner ownership interest	2.00%		2.00%
Common Limited Partner [Member]
Class of Stock [Line Items]
Common unitholders ownership interest	98.00%
Cash distributions per unit applicable to common limited partners	$ 0.60	$ 1.095	$ 1.095
General Partner [Member]
Class of Stock [Line Items]
General partner ownership interest	2.00%

PARTNERS' EQUITY Table 6 - Net

PARTNERS' EQUITY Table 6 - Net Income Applicable to the General Partner (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income Allocation [Abstract]
Net income attributable to NuStar Energy L.P.	$ 126,133	$ 57,940
Less preferred limited partner interest	15,990	4,813
Less general partner incentive distribution	0	12,912
Net income after general partner incentive distribution and preferred limited partner interest	$ 110,143	$ 40,215
General partner interest allocation	2.00%	2.00%
General partner interest allocation of net income	$ 2,203	$ 804
General partner incentive distribution	0	12,912
Net income applicable to general partner	$ 2,203	$ 13,716

PARTNERS' EQUITY Table 7 - Bala

PARTNERS' EQUITY Table 7 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2017	$ (84,927)
Other comprehensive income (loss)	20,924
Balance as of March 31, 2018	(64,003)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2017	(51,603)
Other comprehensive income (loss) before reclassification adjustments	2,312
Other comprehensive income (loss)	2,372
Balance as of March 31, 2018	(49,231)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2017	(24,304)
Other comprehensive income (loss) before reclassification adjustments	17,421
Other comprehensive income (loss)	18,811
Balance as of March 31, 2018	(5,493)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2017	(9,020)
Other comprehensive income (loss) before reclassification adjustments	0
Other comprehensive income (loss)	(259)
Balance as of March 31, 2018	(9,279)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2017	(84,927)
Other comprehensive income (loss) before reclassification adjustments	19,733
Other comprehensive income (loss)	20,924
Balance as of March 31, 2018	(64,003)
Other income, net | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	0
Other	60
Other income, net | Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	0
Other	0
Other income, net | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	(203)
Other	(56)
Other income, net | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	(203)
Other	4
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	1,390
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	$ 1,390

REVENUE FROM CONTRACTS WITH C58

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 1 - Adoption Impact of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 475,881	$ 487,430
Operating income (loss)	98,480	97,139
Net income (loss)	$ 126,133	$ 57,940
Basic net income per common unit	$ 1.15	$ 0.49
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Revenue Recognition [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 481,786
Operating income (loss)	104,385
Net income (loss)	$ 132,038
Basic net income per common unit	$ 1.21
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenue Recognition [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ (5,905)
Operating income (loss)	(5,905)
Net income (loss)	$ (5,905)
Basic net income per common unit	$ (0.06)

REVENUE FROM CONTRACTS WITH C59

REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative (Details)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Payment terms	Generally, payment terms do not exceed 30 days.

REVENUE FROM CONTRACTS WITH C60

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 2 - Contract Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Contract assets
Balance as of January 1, 2018	$ 2,127
Additions	460
Transfer to accounts receivable	(1,653)
Total activity	(1,193)
Balance as of March 31, 2018	934
Less current portion	749
Noncurrent portion	185
Contract liabilities
Balance as of January 1, 2018	(57,870)
Additions	(2,386)
Transfer to revenues	2,935
Total activity	549
Balance as of March 31, 2018	(57,321)
Less current portion	(13,579)
Noncurrent portion	$ (43,742)

REVENUE FROM CONTRACTS WITH C61

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 3 - Expected Timing of Satisfaction of Performance Obligations (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	9 months
Remaining performance obligation	$ 377,456
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Remaining performance obligation	$ 348,414
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Remaining performance obligation	$ 202,526
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Remaining performance obligation	$ 141,957
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Remaining performance obligation	$ 105,769
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Remaining performance obligation	$ 1,510,003

REVENUE FROM CONTRACTS WITH C62

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 4 - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 475,881	$ 487,430
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues	(2,075)	(3,943)
Pipeline Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	136,736	121,240
Revenues	136,790	121,240
Lessor revenues	54	0
Pipeline Segment | Crude Oil Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	53,437	36,747
Pipeline Segment | Refined Products and Ammonia Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	83,299	84,493
Storage Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	145,366	137,650
Revenues	155,328	147,431
Lessor revenues	9,962	9,781
Storage Segment | Throughput Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	20,016	20,690
Storage Segment | Storage Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	125,350	116,960
Fuels Marketing Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	185,838	222,702
Revenues	$ 185,838	$ 222,702

NET INCOME PER COMMON UNIT Tabl

NET INCOME PER COMMON UNIT Table - Net Income per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to NuStar Energy L.P.	$ 126,133	$ 57,940
Less: Distributions to preferred limited partners	15,990	4,813
Less: Distributions to general partner (including incentive distribution rights)	1,141	15,255
Less: Distributions to common limited partners	55,916	101,913
Less: Distribution equivalents rights to restricted units	445	715
Distributions less than (in excess of) earnings	52,641	(64,756)
Net income attributable to common units:
Common limited partners’ distribution	55,916	101,913
Allocation of distributions less than (in excess of) earnings	51,148	(63,461)
Total	$ 107,064	$ 38,452
Basic weighted-average common units outstanding	93,181,781	78,642,888
Basic net income per common unit	$ 1.15	$ 0.49

STATEMENTS OF CASH FLOWS Table

STATEMENTS OF CASH FLOWS Table 1 - Changes in Current Assets and Current Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Decrease (increase) in current assets:
Accounts receivable	$ 19,525	$ 3,544
Receivable from related party	133	237
Inventories	(2,687)	1,658
Other current assets	3,224	307
Increase (decrease) in current liabilities:
Accounts payable	(7,681)	(12,154)
Accrued interest payable	3,552	(6,301)
Accrued liabilities	(6,019)	(21,006)
Taxes other than income tax	(1,558)	(2,752)
Income tax payable	2,202	(2,675)
Changes in current assets and current liabilities	$ 10,691	$ (39,142)

STATEMENTS OF CASH FLOWS Tabl65

STATEMENTS OF CASH FLOWS Table 2 - Cash Flows Related to Interest and Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Cash paid for interest, net of amount capitalized	$ 42,549	$ 42,146
Cash paid for income taxes, net of tax refunds received	$ 2,635	$ 4,828

SEGMENT INFORMATION Table 1 - R

SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Revenues	$ 475,881	$ 487,430
Operating income:
General and administrative expenses	19,774	24,595
Other depreciation and amortization expense	2,118	2,193
Operating income (loss)	98,480	97,139
Pipeline Segment
Revenues:
Revenues	136,790	121,240
Storage Segment
Revenues:
Revenues	155,328	147,431
Storage Segment | Third Party Revenue [Member]
Revenues:
Revenues	153,253	143,488
Storage Segment | Intersegment Revenue [Member]
Revenues:
Revenues	2,075	3,943
Fuels Marketing Segment
Revenues:
Revenues	185,838	222,702
Operating Segments [Member]
Operating income:
Operating income (loss)	120,372	123,927
Operating Segments [Member] | Pipeline Segment
Operating income:
Operating income (loss)	57,794	65,028
Operating Segments [Member] | Storage Segment
Operating income:
Operating income (loss)	56,261	53,759
Operating Segments [Member] | Fuels Marketing Segment
Operating income:
Operating income (loss)	6,320	5,140
Intersegment Eliminations [Member]
Revenues:
Revenues	(2,075)	(3,943)
Operating income:
Operating income (loss)	(3)	0
Corporate, Non-Segment [Member]
Operating income:
General and administrative expenses	19,774	24,595
Other depreciation and amortization expense	$ 2,118	$ 2,193

SEGMENT INFORMATION Table 2 - A

SEGMENT INFORMATION Table 2 - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Segment Information
Total assets	$ 6,586,713	$ 6,535,233
Other Partnership Assets
Segment Information
Total assets	187,122	188,507
Operating Segments [Member]
Segment Information
Total assets	6,399,591	6,346,726
Operating Segments [Member] | Pipeline Segment
Segment Information
Total assets	3,516,435	3,492,417
Operating Segments [Member] | Storage Segment
Segment Information
Total assets	2,761,667	2,735,563
Operating Segments [Member] | Fuels Marketing Segment
Segment Information
Total assets	$ 121,489	$ 118,746

CONDENSED CONSOLIDATING FINAN68

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Narrative (Details)	3 Months Ended
	Mar. 31, 2018
NuPOP
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%
NuStar Logistics
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%

CONDENSED CONSOLIDATING FINAN69

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 15,128	$ 24,292	$ 27,205	$ 35,942
Receivables, net	157,341	176,775
Inventories	29,549	26,857
Other current assets	25,979	22,508
Intercompany receivable	0	0
Total current assets	227,997	250,432
Property, plant and equipment, net	4,387,224	4,300,933
Intangible assets, net	771,623	784,479
Goodwill	1,094,661	1,097,475
Investment in wholly owned subsidiaries	0	0
Deferred income tax asset	0	233
Other long-term assets, net	105,208	101,681
Total assets	6,586,713	6,535,233
Liabilities and Partners' Equity
Accounts payable	122,040	145,932
Short-term debt	70,000	35,000
Current portion of long-term debt	349,973	349,990
Accrued interest payable	43,974	40,449
Accrued liabilities	47,520	61,578
Taxes other than income tax	12,751	14,385
Income tax payable	6,378	4,172
Intercompany payable	0	0
Total current liabilities	652,636	651,506
Long-term debt, less current portion	3,306,093	3,263,069
Deferred income tax liability	23,032	22,272
Other long-term liabilities	112,895	118,297
Total partners' equity	2,492,057	2,480,089
Total liabilities and partners' equity	6,586,713	6,535,233
Eliminations [Member]
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Inventories	0	0
Other current assets	0	0
Intercompany receivable	(3,132,310)	(3,112,164)
Total current assets	(3,132,310)	(3,112,164)
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Goodwill	0	0
Investment in wholly owned subsidiaries	(5,166,792)	(5,008,132)
Deferred income tax asset		0
Other long-term assets, net	0	0
Total assets	(8,299,102)	(8,120,296)
Liabilities and Partners' Equity
Accounts payable	0	0
Short-term debt	0	0
Current portion of long-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	(3,132,310)	(3,112,164)
Total current liabilities	(3,132,310)	(3,112,164)
Long-term debt, less current portion	0	0
Deferred income tax liability	0	0
Other long-term liabilities	0	0
Total partners' equity	(5,166,792)	(5,008,132)
Total liabilities and partners' equity	(8,299,102)	(8,120,296)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	858	885	746	870
Receivables, net	0	0
Inventories	0	0
Other current assets	139	61
Intercompany receivable	0	0
Total current assets	997	946
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Goodwill	0	0
Investment in wholly owned subsidiaries	2,881,187	2,891,371
Deferred income tax asset		0
Other long-term assets, net	303	303
Total assets	2,882,487	2,892,620
Liabilities and Partners' Equity
Accounts payable	3,309	4,078
Short-term debt	0	0
Current portion of long-term debt	0	0
Accrued interest payable	0	0
Accrued liabilities	655	1,105
Taxes other than income tax	206	125
Income tax payable	0	0
Intercompany payable	322,257	322,296
Total current liabilities	326,427	327,604
Long-term debt, less current portion	0	0
Deferred income tax liability	0	0
Other long-term liabilities	0	0
Total partners' equity	2,556,060	2,565,016
Total liabilities and partners' equity	2,882,487	2,892,620
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	26	29	6	5
Receivables, net	623	280
Inventories	1,844	1,686
Other current assets	13,905	11,412
Intercompany receivable	3,132,310	3,112,164
Total current assets	3,148,708	3,125,571
Property, plant and equipment, net	1,874,347	1,893,720
Intangible assets, net	56,174	58,530
Goodwill	149,453	149,453
Investment in wholly owned subsidiaries	19,795	24,162
Deferred income tax asset		0
Other long-term assets, net	70,343	65,684
Total assets	5,318,820	5,317,120
Liabilities and Partners' Equity
Accounts payable	19,472	27,642
Short-term debt	70,000	35,000
Current portion of long-term debt	349,973	349,990
Accrued interest payable	43,921	40,402
Accrued liabilities	11,579	17,628
Taxes other than income tax	3,906	7,110
Income tax payable	902	732
Intercompany payable	0	0
Total current liabilities	499,753	478,504
Long-term debt, less current portion	3,248,763	3,201,220
Deferred income tax liability	1,262	1,262
Other long-term liabilities	43,854	58,806
Total partners' equity	1,525,188	1,577,328
Total liabilities and partners' equity	5,318,820	5,317,120
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Inventories	11,039	8,611
Other current assets	3,538	4,191
Intercompany receivable	0	0
Total current assets	14,577	12,802
Property, plant and equipment, net	585,056	591,070
Intangible assets, net	0	0
Goodwill	170,652	170,652
Investment in wholly owned subsidiaries	1,413,835	1,301,717
Deferred income tax asset		0
Other long-term assets, net	27,204	27,493
Total assets	2,211,324	2,103,734
Liabilities and Partners' Equity
Accounts payable	5,232	13,160
Short-term debt	0	0
Current portion of long-term debt	0	0
Accrued interest payable	0	0
Accrued liabilities	8,214	9,450
Taxes other than income tax	5,246	3,794
Income tax payable	4	4
Intercompany payable	1,326,659	1,277,691
Total current liabilities	1,345,355	1,304,099
Long-term debt, less current portion	0	0
Deferred income tax liability	12	12
Other long-term liabilities	14,191	8,861
Total partners' equity	851,766	790,762
Total liabilities and partners' equity	2,211,324	2,103,734
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	14,244	23,378	$ 26,453	$ 35,067
Receivables, net	156,718	176,495
Inventories	16,666	16,560
Other current assets	8,397	6,844
Intercompany receivable	0	0
Total current assets	196,025	223,277
Property, plant and equipment, net	1,927,821	1,816,143
Intangible assets, net	715,449	725,949
Goodwill	774,556	777,370
Investment in wholly owned subsidiaries	851,975	790,882
Deferred income tax asset		233
Other long-term assets, net	7,358	8,201
Total assets	4,473,184	4,342,055
Liabilities and Partners' Equity
Accounts payable	94,027	101,052
Short-term debt	0	0
Current portion of long-term debt	0	0
Accrued interest payable	53	47
Accrued liabilities	27,072	33,395
Taxes other than income tax	3,393	3,356
Income tax payable	5,472	3,436
Intercompany payable	1,483,394	1,512,177
Total current liabilities	1,613,411	1,653,463
Long-term debt, less current portion	57,330	61,849
Deferred income tax liability	21,758	20,998
Other long-term liabilities	54,850	50,630
Total partners' equity	2,725,835	2,555,115
Total liabilities and partners' equity	$ 4,473,184	$ 4,342,055

CONDENSED CONSOLIDATING FINAN70

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 2 - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 475,881	$ 487,430
Costs and expenses	377,401	390,291
Operating (loss) income	98,480	97,139
Equity in earnings (loss) of subsidiaries	0	0
Interest income (expense), net	(47,772)	(36,414)
Other income (expense), net	79,752	140
Income before income tax expense	130,460	60,865
Income tax expense (benefit)	4,327	2,925
Net income (loss)	126,133	57,940
Comprehensive income (loss)	147,057	61,703
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	(202)	(287)
Costs and expenses	(202)	(287)
Operating (loss) income	0	0
Equity in earnings (loss) of subsidiaries	(368,106)	(133,123)
Interest income (expense), net	0	0
Other income (expense), net	0	0
Income before income tax expense	(368,106)	(133,123)
Income tax expense (benefit)	0	0
Net income (loss)	(368,106)	(133,123)
Comprehensive income (loss)	(368,106)	(133,123)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Costs and expenses	612	509
Operating (loss) income	(612)	(509)
Equity in earnings (loss) of subsidiaries	126,713	58,445
Interest income (expense), net	32	4
Other income (expense), net	0	0
Income before income tax expense	126,133	57,940
Income tax expense (benefit)	0	0
Net income (loss)	126,133	57,940
Comprehensive income (loss)	126,133	57,940
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	119,694	123,629
Costs and expenses	72,416	76,322
Operating (loss) income	47,278	47,307
Equity in earnings (loss) of subsidiaries	(2,249)	1,110
Interest income (expense), net	(50,026)	(36,914)
Other income (expense), net	476	21
Income before income tax expense	(4,521)	11,524
Income tax expense (benefit)	170	331
Net income (loss)	(4,691)	11,193
Comprehensive income (loss)	14,120	13,031
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	56,274	52,241
Costs and expenses	35,181	29,806
Operating (loss) income	21,093	22,435
Equity in earnings (loss) of subsidiaries	112,003	26,215
Interest income (expense), net	(1,571)	(1,304)
Other income (expense), net	115	6
Income before income tax expense	131,640	47,352
Income tax expense (benefit)	1	1
Net income (loss)	131,639	47,351
Comprehensive income (loss)	131,639	47,351
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	300,115	311,847
Costs and expenses	269,394	283,941
Operating (loss) income	30,721	27,906
Equity in earnings (loss) of subsidiaries	131,639	47,353
Interest income (expense), net	3,793	1,800
Other income (expense), net	79,161	113
Income before income tax expense	245,314	77,172
Income tax expense (benefit)	4,156	2,593
Net income (loss)	241,158	74,579
Comprehensive income (loss)	$ 243,271	$ 76,504

CONDENSED CONSOLIDATING FINAN71

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 3 - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net cash provided by operating activities	$ 123,164	$ 83,980
Cash flows from investing activities:
Capital expenditures	(137,874)	(45,732)
Change in accounts payable related to capital expenditures	(12,018)	(6,820)
Proceeds from sale or disposition of assets	19	1,859
Proceeds from insurance recoveries	78,419	0
Proceeds from Axeon term loan	0	110,000
Net cash provided by (used in) investing activities	(71,454)	59,307
Cash flows from financing activities:
Debt borrowings	349,711	410,266
Debt repayments	(274,421)	(455,194)
Distributions to preferred unitholders	(16,680)	(5,883)
Distributions to common unitholders and general partner	(115,272)	(99,021)
Net intercompany activity	0	0
Other, net	(4,184)	(2,218)
Net cash used in financing activities	(60,846)	(152,050)
Effect of foreign exchange rate changes on cash	(28)	26
Net increase (decrease) in cash and cash equivalents	(9,164)	(8,737)
Cash and cash equivalents as of the beginning of the period	24,292	35,942
Cash and cash equivalents as of the end of the period	15,128	27,205
Eliminations [Member]
Cash flows from operating activities:
Net cash provided by operating activities	(197,937)	(157,360)
Cash flows from investing activities:
Capital expenditures	0	0
Change in accounts payable related to capital expenditures	0	0
Proceeds from sale or disposition of assets	0	0
Proceeds from insurance recoveries	0
Proceeds from Axeon term loan		0
Net cash provided by (used in) investing activities	0	0
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to preferred unitholders	25,021	8,824
Distributions to common unitholders and general partner	172,916	148,536
Net intercompany activity	0	0
Other, net	0	0
Net cash used in financing activities	197,937	157,360
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
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	130,847	103,517
Cash flows from investing activities:
Capital expenditures	0	0
Change in accounts payable related to capital expenditures	0	0
Proceeds from sale or disposition of assets	0	0
Proceeds from insurance recoveries	0
Proceeds from Axeon term loan		0
Net cash provided by (used in) investing activities	0	0
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to preferred unitholders	(16,680)	(5,883)
Distributions to common unitholders and general partner	(115,272)	(99,021)
Net intercompany activity	2,053	3,196
Other, net	(975)	(1,933)
Net cash used in financing activities	(130,874)	(103,641)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	(27)	(124)
Cash and cash equivalents as of the beginning of the period	885	870
Cash and cash equivalents as of the end of the period	858	746
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	16,855	35,964
Cash flows from investing activities:
Capital expenditures	(6,815)	(7,671)
Change in accounts payable related to capital expenditures	(1,946)	(4,908)
Proceeds from sale or disposition of assets	6	1,833
Proceeds from insurance recoveries	0
Proceeds from Axeon term loan		110,000
Net cash provided by (used in) investing activities	(8,755)	99,254
Cash flows from financing activities:
Debt borrowings	348,411	404,166
Debt repayments	(268,621)	(451,694)
Distributions to preferred unitholders	(8,341)	(2,941)
Distributions to common unitholders and general partner	(57,636)	(49,511)
Net intercompany activity	(18,769)	(34,952)
Other, net	(3,147)	(285)
Net cash used in financing activities	(8,103)	(135,217)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	(3)	1
Cash and cash equivalents as of the beginning of the period	29	5
Cash and cash equivalents as of the end of the period	26	6
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	25,112	23,855
Cash flows from investing activities:
Capital expenditures	(2,440)	(1,761)
Change in accounts payable related to capital expenditures	(5,700)	(1,103)
Proceeds from sale or disposition of assets	4	6
Proceeds from insurance recoveries	0
Proceeds from Axeon term loan		0
Net cash provided by (used in) investing activities	(8,136)	(2,858)
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to preferred unitholders	(8,340)	(2,941)
Distributions to common unitholders and general partner	(57,635)	(49,511)
Net intercompany activity	48,999	31,455
Other, net	0	0
Net cash used in financing activities	(16,976)	(20,997)
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 [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	148,287	78,004
Cash flows from investing activities:
Capital expenditures	(128,619)	(36,300)
Change in accounts payable related to capital expenditures	(4,372)	(809)
Proceeds from sale or disposition of assets	9	20
Proceeds from insurance recoveries	78,419
Proceeds from Axeon term loan		0
Net cash provided by (used in) investing activities	(54,563)	(37,089)
Cash flows from financing activities:
Debt borrowings	1,300	6,100
Debt repayments	(5,800)	(3,500)
Distributions to preferred unitholders	(8,340)	(2,942)
Distributions to common unitholders and general partner	(57,645)	(49,514)
Net intercompany activity	(32,283)	301
Other, net	(62)	0
Net cash used in financing activities	(102,830)	(49,555)
Effect of foreign exchange rate changes on cash	(28)	26
Net increase (decrease) in cash and cash equivalents	(9,134)	(8,614)
Cash and cash equivalents as of the beginning of the period	23,378	35,067
Cash and cash equivalents as of the end of the period	$ 14,244	$ 26,453