NuStar Energy (NS) 10-Q 10 May 19 2019 Q1 Quarterly report Financial data

DEI Document

DEI Document - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document Information [Abstract]
Entity Registrant Name	NuStar Energy L.P.
Entity Central Index Key	0001110805
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	ns
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Partnership Units Outstanding		107,763,005

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 15,822	$ 13,644
Accounts receivable, net of allowance for doubtful accounts of $11,702 and $9,412 as of March 31, 2019 and December 31, 2018, respectively	163,739	148,308
Inventories	25,023	22,713
Prepaid and other current assets	21,361	17,493
Total current assets	225,945	202,158
Property, plant and equipment, at cost	6,051,532	6,338,312
Accumulated depreciation and amortization	(1,907,267)	(2,049,690)
Property, plant and equipment, net	4,144,265	4,288,622
Intangible assets, net	720,200	733,056
Goodwill	1,005,853	1,036,976
Other long-term assets, net	220,636	88,328
Total assets	6,316,899	6,349,140
Current liabilities:
Accounts payable	176,871	143,121
Short-term debt and current portion of finance leases	9,335	18,500
Accrued interest payable	31,162	36,293
Accrued liabilities	82,734	101,993
Taxes other than income tax	16,139	19,083
Income tax payable	5,145	4,445
Total current liabilities	321,386	323,435
Long-term debt	3,333,220	3,111,996
Deferred income tax liability	11,787	12,428
Other long-term liabilities	193,536	79,558
Total liabilities	3,859,929	3,527,417
Commitments and contingencies (Note 6)
Series D preferred limited partners (23,246,650 preferred units outstanding as of March 31, 2019 and December 31, 2018) (Note 10)	568,293	563,992
Partners’ equity (Note 11):
Preferred limited partners (9,060,000 Series A preferred units, 15,400,000 Series B preferred units and 6,900,000 Series C preferred units outstanding as of March 31, 2019 and December 31, 2018)	756,301	756,301
Common limited partners (107,762,875 and 107,225,156 common units outstanding as of March 31, 2019 and December 31, 2018, respectively)	1,192,080	1,556,308
Accumulated other comprehensive loss	(59,704)	(54,878)
Total partners’ equity	1,888,677	2,257,731
Total liabilities, mezzanine equity and partners’ equity	$ 6,316,899	$ 6,349,140

CONSOLIDATED BALANCE SHEETS Non

CONSOLIDATED BALANCE SHEETS Non-Printing - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 11,702	$ 9,412
Series D preferred units outstanding	23,246,650	23,246,650
Limited partners common units outstanding (in units)	107,762,875	107,225,156
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, 2019	Mar. 31, 2018
Revenues:
Total revenues	$ 486,469	$ 475,881
Costs and expenses:
Operating expenses (excluding depreciation and amortization expense)	113,937	108,884
Depreciation and amortization expense	72,287	69,897
Asset impairment loss	297,317	0
Goodwill impairment loss	31,123	0
General and administrative expenses (excluding depreciation and amortization expense)	25,996	19,774
Other depreciation and amortization expense	2,119	2,118
Total costs and expenses	719,568	377,401
Operating (loss) income	(233,099)	98,480
Interest expense, net	(44,268)	(47,772)
Other income, net	787	79,752
Income (loss) before income tax expense	(276,580)	130,460
Income tax expense	1,283	4,327
Net (loss) income	$ (277,863)	$ 126,133
Basic net (loss) income per common unit	$ (2.91)	$ 1.15
Basic weighted-average common units outstanding	107,531,619	93,181,781
Comprehensive (loss) income	$ (282,689)	$ 147,057
Service [Member]
Revenues:
Total revenues	298,405	291,413
Costs and expenses:
Total costs associated with service revenues/Cost of product sales	186,224	178,781
Product [Member]
Revenues:
Total revenues	188,064	184,468
Costs and expenses:
Total costs associated with service revenues/Cost of product sales	$ 176,789	$ 176,728

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ (277,863)	$ 126,133
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization expense	74,406	72,015
Unit-based compensation expense	2,982	2,091
Amortization of debt related items	1,310	1,413
Asset impairment loss	297,317	0
Goodwill impairment loss	31,123	0
Gain from insurance recoveries	0	(78,756)
Deferred income tax (benefit) expense	(847)	842
Changes in current assets and current liabilities (Note 13)	(33,403)	10,691
Increase in other long-term assets	(74)	(829)
Increase (decrease) in other long-term liabilities	9,275	(10,214)
Other, net	(658)	(222)
Net cash provided by operating activities	103,568	123,164
Cash flows from investing activities:
Capital expenditures	(159,429)	(137,874)
Change in accounts payable related to capital expenditures	19,401	(12,018)
Proceeds from sale or disposition of assets	79	19
Proceeds from insurance recoveries	0	78,419
Net cash used in investing activities	(139,949)	(71,454)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	230,000	119,711
Proceeds from short-term debt borrowings	81,500	230,000
Long-term debt repayments	(63,600)	(79,421)
Short-term debt repayments	(94,500)	(195,000)
Distributions to preferred unitholders	(30,423)	(16,680)
Distributions to common unitholders and general partner	(64,367)	(115,272)
Payment of tax withholding for unit-based compensation	(6,366)	(51)
Decrease in cash book overdrafts	(3,608)	(1,009)
Other, net	(1,519)	(3,124)
Net cash provided by (used in) financing activities	47,117	(60,846)
Effect of foreign exchange rate changes on cash	154	(28)
Net increase (decrease) in cash, cash equivalents and restricted cash	10,890	(9,164)
Cash, cash equivalents and restricted cash as of the beginning of the period	13,644	24,292
Cash, cash equivalents and restricted cash as of the end of the period	$ 24,534	$ 15,128

CONSOLIDATED STATEMENTS OF PART

CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY AND MEZZANINE EQUITY - USD ($) $ in Thousands	Total	AOCI [Member]	Preferred Limited Partner [Member]	Series A Preferred Limited Partner [Member]	Series B Preferred Limited Partner [Member]	Series C Preferred Limited Partner [Member]	Series D Preferred Limited Partner [Member]	Common Limited Partner [Member]	General Partner [Member]	General Partner and Common Limited Partners [Member]
Partners' capital - beginning balance at Dec. 31, 2017	$ 2,480,089	$ (84,927)	$ 756,603					$ 1,770,587	$ 37,826
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	126,133	0	15,990	$ 4,813	$ 7,339	$ 3,838		107,940	2,203
Other comprehensive income (loss)	20,924	20,924	0					0	0
Cash distributions to partners			(15,990)	(4,813)	(7,339)	(3,838)		(102,034)	(13,238)	$ (115,272)
Unit-based compensation	1,286	0	0					1,286	0
Series D Preferred Unit accretion, common (refer to Note 11 for discussion)	0
Other	(5,113)	0	(109)	$ 0	$ 0	$ (109)		(4,905)	(99)
Partners' capital - ending balance at Mar. 31, 2018	2,492,057	(64,003)	756,494					$ 1,772,874	$ 26,692
Increase (Decrease) in Partners' Capital [Roll Forward]
Cash distributions paid, per unit				$ 0.53125	$ 0.47657	$ 0.5625		$ 1.095
Partners' capital - beginning balance at Dec. 31, 2018	2,257,731	(54,878)	756,301					$ 1,556,308
Temporary equity - beginning balance at Dec. 31, 2018	563,992
Partners' capital and temporary equity - beginning balance at Dec. 31, 2018	2,821,723
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	(277,863)	0	16,033	$ 4,813	$ 7,339	$ 3,881		(308,286)
Net income (loss) excluding portion attributable to temporary equity	(292,253)
Net income, temporary equity							$ 14,390
Other comprehensive income (loss)	(4,826)	(4,826)	0					0
Cash distributions to partners			(16,033)	$ (4,813)	$ (7,339)	$ (3,881)		(64,367)
Cash distributions to partners, temporary equity							(14,390)
Unit-based compensation	13,540	0	0					13,540
Series D Preferred Unit accretion, common (refer to Note 11 for discussion)	(4,302)							(4,302)
Series D Preferred Unit accretion, preferred (refer to Note 11 for discussion)							4,302
Series D Preferred Unit accretion, total (refer to Note 11 for discussion)	0
Other	(813)	0	0					(813)
Other, temporary equity							$ (1)
Other, including temporary equity	(814)
Partners' capital - ending balance at Mar. 31, 2019	1,888,677	$ (59,704)	$ 756,301					$ 1,192,080
Temporary equity - ending balance at Mar. 31, 2019	568,293
Partners' capital and temporary equity - ending balance at Mar. 31, 2019	$ 2,456,970
Increase (Decrease) in Partners' Capital [Roll Forward]
Cash distributions paid, per unit				$ 0.53125	$ 0.47657	$ 0.5625	$ 0.619	$ 0.6

ORGANIZATION AND BASIS OF PRESE

ORGANIZATION AND BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2019
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. On July 20, 2018, we completed the merger of NuStar GP Holdings, LLC (NuStar GP Holdings or NSH) with a subsidiary of NS. Consequently, NSH, which indirectly owns our general partner, became a wholly owned subsidiary of ours. Under the terms of the merger agreement, NSH unitholders received 0.55 of a common unit representing a limited partner interest in NS in exchange for each NSH unit owned at the effective time of the merger, resulting in approximately 13.4 million incremental NS common units outstanding after the merger. 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. 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, 2019 and 2018 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, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 . The consolidated balance sheet as of December 31, 2018 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, 2018 . New Accounting Policy As of March 31, 2019, we have restricted cash representing legally restricted funds that are unavailable for general use totaling $8.7 million , which is included in “Prepaid and other current assets” on the consolidated balance sheet.

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
NEW ACCOUNTING PRONOUNCEMENTS	NEW ACCOUNTING PRONOUNCEMENTS Securities and Exchange Commission Disclosure Update and Simplification In August 2018, the Securities and Exchange Commission (SEC) issued final rules regarding disclosure requirements that were redundant, duplicative, overlapping or superseded by other SEC requirements or GAAP. The final rules primarily eliminated or reduced certain disclosure requirements, although they also required some additional disclosures. The guidance became effective on November 5, 2018, with an exception for the new disclosure requirement to present changes in partners’ equity in interim periods, which permits entities to begin disclosing this information in the quarter that begins after the effective date of the final rules. We elected to utilize this exception, and began presenting statements of partners’ equity on an interim basis beginning with the quarter ending March 31, 2019. These final rules did not have an impact on our financial position or results of operations. Cloud Computing Arrangements In August 2018, the Financial Accounting Standards Board (FASB) issued guidance addressing a customer’s accounting for implementation costs incurred in a cloud computing arrangement (CCA) that is considered a service contract. Under the new guidance, implementation costs for a CCA should be evaluated for capitalization using the same approach as implementation costs associated with internal-use software and expensed over the term of the hosting arrangement. The guidance is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. Prospective adoption for eligible costs incurred on or after the date of adoption or retrospective adoption are permitted. We are currently evaluating whether we will adopt these provisions early and whether we will elect prospective or retrospective adoption, but we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures. Disclosures for Defined Benefit Plans In August 2018, the FASB issued amended guidance that makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. The guidance is effective for annual periods beginning after December 15, 2020, with early adoption permitted, using a retrospective approach. 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. 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. We early adopted the amended guidance during the first quarter of 2019 and applied the guidance to the goodwill impairment discussed in Note 3. 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 we 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 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 one of two modified retrospective transition methods. We adopted these provisions on January 1, 2019 through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The transition adjustment related to the adoption was immaterial , and we do not expect the adoption of this guidance to impact the results of our operations going forward. Please refer to Note 7 for further discussion.

IMPAIRMENTS

IMPAIRMENTS	3 Months Ended
	Mar. 31, 2019
Asset Impairment Charges [Abstract]
Asset Impairment Charges [Text Block]	IMPAIRMENTS On May 9, 2019, we entered into a Share Purchase and Sale Agreement to sell the equity interests in our wholly owned subsidiaries that own the St. Eustatius terminal and bunkering operations for approximately $250.0 million , subject to adjustment. The terminal operations are included in our storage segment and the bunkering operations are included in our fuels marketing segment. We expect to complete the sale in the second quarter of 2019. On January 28, 2019, the U.S. Department of the Treasury’s Office of Foreign Assets Control added Petroleos de Venezuela, S.A. (PDVSA), a customer at our St. Eustatius facility, to its List of Specially Designated Nationals and Blocked Persons (the SDN List). The inclusion of PDVSA on the SDN List required us to wind down our contracts with PDVSA. Prior to winding down such contracts, PDVSA was the St. Eustatius terminal’s largest customer. The effect of the sanctions issued against PDVSA, combined with the progression in the sale negotiations that occurred during March 2019, resulted in triggering events that caused us to evaluate the long-lived assets and goodwill associated with the St. Eustatius terminal and bunkering operations for potential impairment. With respect to the terminal operations long-lived assets, our estimates of future expected cash flows included the possibility of a near-term sale, as well as continuing to operate the terminal. The carrying value of the terminal’s long-lived assets exceeded our estimate of the total expected cash flows, indicating the long-lived assets were potentially impaired. To determine an impairment amount, we estimated the fair value of the long-lived assets for comparison to the carrying amount of those assets. Our estimate of the fair value considered the expected sales price as well as estimates generated from income and market approaches using a market participant’s assumptions. The estimated fair values resulting from the market and income approaches were consistent with the expected sales price. Therefore, we concluded that the estimated sales price, which was less than the carrying amount of the long-lived assets, represented the best estimate of fair value at March 31, 2019, and we recorded a long-lived asset impairment charge of $297.3 million in the first quarter of 2019 to reduce the carrying value of the assets to their estimated fair value. Our estimate of the fair value is based on a transaction price in a market that is not active and thus falls within Level 2 of the fair value hierarchy. With respect to the goodwill in the Statia Bunkering reporting unit, which consists of our bunkering operations at our St. Eustatius terminal facility, we estimated the fair value based on the expected sales price discussed above, which is inclusive of the bunkering operations. As a result, we concluded the goodwill was impaired. Consistent with FASB’s amended goodwill impairment guidance discussed in Note 2, which we adopted in the first quarter of 2019, we measured the goodwill impairment as the difference between the reporting unit’s carrying value and its fair value. Therefore, we recognized a goodwill impairment charge of $31.1 million in the first quarter of 2019 to reduce the goodwill to $0 . The long-lived asset impairment charge is reported in the storage segment, and the goodwill impairment charge is included in the fuels marketing segment.

REVENUE FROM CONTRACTS WITH CUS

REVENUE FROM CONTRACTS WITH CUSTOMERS	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS [Text Block]	REVENUE FROM CONTRACTS WITH CUSTOMERS Contract Assets and Contract Liabilities The following table provides information about contract assets and contract liabilities from contracts with customers: 2019 2018 Contract Assets Contract Liabilities Contract Assets Contract Liabilities (Thousands of Dollars) Balance as of January 1 $ 2,605 $ (85,881 ) $ 2,127 $ (57,870 ) Additions 941 (11,094 ) 460 (2,386 ) Transfer to accounts receivable (1,272 ) — (1,653 ) — Transfer to revenues — 34,714 — 2,935 Total activity (331 ) 23,620 (1,193 ) 549 Balance as of March 31 2,274 (62,261 ) 934 (57,321 ) Less current portion 1,381 (21,798 ) 749 (13,579 ) Noncurrent portion $ 893 $ (40,463 ) $ 185 $ (43,742 ) As previously discussed in Note 3, the inclusion of PDVSA on the SDN List prevents us from providing services to PDVSA until such time as these sanctions are lifted or otherwise modified. As a result, in the first quarter we accelerated the recognition of revenue totaling $16.3 million , representing the amount remaining from a third quarter 2018 settlement we entered into with PDVSA. 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, 2019 (in thousands of dollars): 2019 (remaining) $ 336,361 2020 374,486 2021 258,906 2022 215,033 2023 165,288 Thereafter 365,808 Total $ 1,715,882 Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to service customer contracts that have fixed pricing and fixed volume terms and conditions, generally including contracts with payment obligations for take-or-pay minimum volume commitments. Disaggregation of Revenues The following table disaggregates our revenues: Three Months Ended March 31, 2019 2018 (Thousands of Dollars) Pipeline segment: Crude oil pipelines $ 68,478 $ 53,437 Refined products and ammonia pipelines (excluding lessor revenues) 85,106 83,299 Total pipeline segment revenues from contracts with customers 153,584 136,736 Lessor revenues 2,667 54 Total pipeline segment revenues 156,251 136,790 Storage segment: Throughput terminals 21,686 20,016 Storage terminals (excluding lessor revenues) 111,132 125,350 Total storage segment revenues from contracts with customers 132,818 145,366 Lessor revenues 10,193 9,962 Total storage segment revenues 143,011 155,328 Fuels marketing segment: Revenues from contracts with customers 189,068 185,838 Consolidation and intersegment eliminations (1,861 ) (2,075 ) Total revenues $ 486,469 $ 475,881

DEBT

DEBT	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
DEBT	DEBT Revolving Credit Agreement As of March 31, 2019 , we had $921.0 million outstanding under our $1.4 billion revolving credit agreement (the Revolving Credit Agreement). 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 April 2019, our credit rating was downgraded by S&P Global Ratings from BB to BB- , and our outlook was changed from negative to stable. However, per the terms of the Revolving Credit Agreement, these changes did not impact the interest rate on our Revolving Credit Agreement, which is the only debt arrangement with an interest rate that is subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. As of March 31, 2019 , our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 4.5% . For the rolling period of four quarters ending March 31, 2019 , the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) could not exceed 5.00-to-1.00 and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00. The maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements 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, 2019 , we had $475.4 million available for borrowing, and we believe that we are in compliance with the covenants in the Revolving Credit Agreement. 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). On April 29, 2019, we amended the Receivables Financing Agreement to extend the scheduled termination date from September 20, 2020 to September 20, 2021 and to amend certain provisions with respect to receivables related to certain customers. 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. 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, 2019 was 3.4% . As of March 31, 2019 , $107.5 million of our accounts receivable are included in the Securitization Program. The amount of borrowings outstanding under the Receivables Financing Agreement totaled $52.2 million as of March 31, 2019 , which is included in “Long-term debt” on the consolidated balance sheet.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2019
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 $2.8 million for contingent losses as of March 31, 2019 and December 31, 2018 . 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.

LEASE ASSETS AND LIABILITIES

LEASE ASSETS AND LIABILITIES	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
LEASE ASSETS AND LIABILITIES [Text Block]	LEASE ASSETS AND LIABILITIES Transition On January 1, 2019, we adopted Accounting Standards Codification Topic 842, “Leases” (ASC Topic 842) using the modified retrospective method. Results for reporting periods beginning after January 1, 2019 are presented under ASC Topic 842. In accordance with the modified retrospective approach, prior period amounts were not adjusted and are reported under ASC Topic 840, “Leases.” As a result of the adoption of ASC Topic 842, we recorded right-of-use assets and lease liabilities of approximately $207.0 million and $192.0 million , respectively, as of January 1, 2019. The adoption of ASC Topic 842 had an immaterial impact on our results of operations and cash flows. We elected the following practical expedients permitted under the transition guidance within the new standard: • the package of practical expedients, which, among other things, allowed us to carry forward historical lease classification; • the practical expedient specifically related to land easements, which, among other things, allowed us to carry forward our historical accounting treatment for existing land easement agreement; • the lessee practical expedient to combine lease and non-lease components for all of our asset classes except the other pipeline and terminal equipment asset class; and • the lessor practical expedient to combine lease and non-lease components and to account for the transaction based on the predominant component (i.e., ASC Topic 842 or ASC Topic 606, “Revenue from Contracts with Customers”). We apply this expedient to certain contracts in which we agree to provide both storage capacity and optional services to customers. We record all leases on our consolidated balance sheet except for those leases with an initial term of 12 months or less, which are expensed on a straight-line basis over the lease term. We use judgment in determining the reasonably certain lease term and consider factors such as the nature and utility of the leased asset, as well as the importance of the leased asset to our operations. We calculate the present value of our lease liabilities based upon our incremental borrowing rate unless the rate implicit in the lease is readily determinable. Lessee Arrangements Our operating leases consist primarily of leases for tugs and barges utilized at our St. Eustatius facility for bunker fuel sales and land and dock leases at various terminal facilities. Tug and barge leases have remaining terms of 1 year to 9 years and include options to extend up to 10 years , and land and dock leases have remaining terms generally ranging from 3 years to 17 years and include options to extend up to 15 years . The primary component of our finance lease portfolio is a dock at a terminal facility, which includes a commitment for minimum dockage and wharfage throughput volumes. The dock lease has a remaining initial term of 2 years and four additional five -year renewal periods, all of which we are reasonably certain to exercise. We historically accounted for the dock lease under legacy build-to-suit accounting guidance, which was eliminated by ASC Topic 842. Certain of our leases are subject to variable payment arrangements, the most notable of which include: • dockage and wharfage charges, which are based on volumes moved over leased docks and are included in our calculation of our lease payments based on minimum throughput volumes. We recognize charges on excess throughput volumes in profit or loss in the period in which the obligation for those payments is incurred; and • consumer price index adjustments, which are measured and included in the calculation of our lease payments based on the consumer price index at the adoption date or, after adoption, at the commencement date. We recognize changes in lease payments as a result of changes in the consumer price index in profit or loss in the period in which those payments are made. As of March 31, 2019, right-of-use assets and lease liabilities included in our consolidated balance sheet were as follows: Balance Sheet Location March 31, 2019 (Thousands of Dollars) Right-of-Use Assets: Operating Other long-term assets, net $ 125,531 Finance Property, plant and equipment, net of accumulated amortization of $841 $ 73,824 Lease Liabilities: Operating: Current Accrued liabilities $ 24,178 Noncurrent Other long-term liabilities 101,295 Total operating lease liabilities $ 125,473 Finance: Current Short-term debt and current portion of finance leases $ 3,835 Noncurrent Long-term debt 55,386 Total finance lease liabilities $ 59,221 As of March 31, 2019, maturities of our operating and finance lease liabilities were as follows: Operating Leases Finance Leases (Thousands of Dollars) 2019 (remaining) $ 22,446 $ 4,341 2020 17,014 5,788 2021 13,177 4,338 2022 12,619 3,719 2023 11,651 3,714 Thereafter 79,788 63,222 Total lease payments $ 156,695 $ 85,122 Less: Interest 31,222 25,901 Present value of lease liabilities $ 125,473 $ 59,221 Costs incurred for leases were as follows: Three Months Ended March 31, 2019 (Thousands of Dollars) Operating lease cost $ 9,464 Finance lease cost: Amortization of right-of-use assets 841 Interest expense on lease liability 548 Short-term lease cost 4,314 Variable lease cost 812 Total lease cost $ 15,979 The table below presents additional information regarding our leases: Operating Leases Finance Leases (Thousands of Dollars, Except Term and Rate Data) For the three months ended March 31, 2019: Cash outflows from operating activities $ 9,248 $ 364 Cash outflows from financing activities $ — $ 618 Right-of-use assets obtained in exchange for lease liabilities $ 1,267 $ 393 As of March 31, 2019: Weighted-average remaining lease term (in years) 12 22 Weighted-average discount rate 3.6 % 3.7 % Lessor Arrangements We have entered into certain revenue arrangements where we are considered to be the lessor. Under the largest of these arrangements, we lease certain of our storage tanks in exchange for a fixed fee, subject to an annual consumer price index adjustment. The operating leases commenced on January 1, 2017, and have initial terms of 10 years with successive automatic renewal terms. We recognized lease revenues from these leases of $10.2 million for the three months ended March 31, 2019, which are included in “Service revenues” in the consolidated statements of income. As of March 31, 2019, we expect to receive minimum lease payments totaling $303.2 million , based upon the consumer price index as of the adoption date. We will recognize these payments ratably over the remaining initial lease term of approximately 8 years . As of March 31, 2019, the cost and accumulated depreciation of lease storage assets, which are included in our “Pipeline, storage and terminals” asset class within property, plant and equipment and have an estimated useful life of 30 years , total $233.3 million and $115.2 million , respectively.

DERIVATIVES AND FAIR VALUE MEAS

DERIVATIVES AND FAIR VALUE MEASUREMENTS	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
FAIR VALUE MEASUREMENTS AND DERIVATIVES	DERIVATIVES AND FAIR VALUE MEASUREMENTS Derivative Instruments We utilize various derivative instruments to manage our exposure to interest rate risk and commodity price risk. Our risk management policies and procedures are designed to monitor interest rates, futures and swap positions and over-the-counter positions, as well as physical commodity volumes, grades, locations and delivery schedules, to help ensure that our hedging activities address our market risks. Derivative financial instruments associated with commodity price risk with respect to our petroleum product inventories and related firm commitments to purchase and/or sell such inventories were not material for any periods presented. 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 a forecasted debt issuance in 2020. We entered into these swaps in order to hedge the risk of fluctuations in the required interest payments attributable to changes in the benchmark interest rate during the period from the effective date of the swap to the issuance of the forecasted debt. Under the terms of the swaps, we 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, 2019 and December 31, 2018 , the aggregate notional amount of forward-starting interest rate swaps totaled $250.0 million . The fair values of our interest rate swaps 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) Other long-term assets, net $ — $ 627 $ — $ — Other long-term liabilities $ — $ — $ (6,932 ) $ (751 ) Our interest rate swaps had the following impact on earnings: Three Months Ended March 31, 2019 2018 (Thousands of Dollars) (Loss) gain recognized in other comprehensive (loss) income on derivative $ (6,808 ) $ 17,421 Loss reclassified from AOCI into interest expense, net $ (1,078 ) $ (1,390 ) As of March 31, 2019 , we expect to reclassify a loss of $3.1 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps. 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. 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 interest rate swaps in Level 2 of the fair value hierarchy. Non-recurring Fair Value Measurements. Please refer to Note 3 for a discussion of the non-recurring fair value measurement associated with the impairment of long-lived assets related to our St. Eustatius terminal. 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 other than finance leases, approximate their carrying amounts. The estimated fair values and carrying amounts of long-term debt, excluding finance leases, were as follows: March 31, 2019 December 31, 2018 (Thousands of Dollars) Fair value $ 3,317,920 $ 3,056,704 Carrying amount $ 3,277,834 $ 3,111,996 We have estimated the fair value of our publicly traded notes based upon quoted prices in active markets; therefore, we determined that the fair value of our publicly traded notes falls in Level 1 of the fair value hierarchy. With regard to our other debt, for which a quoted market price is not available, we have estimated the fair value using a discounted cash flow analysis using current incremental borrowing rates for similar types of borrowing arrangements and determined that the fair value falls in Level 2 of the fair value hierarchy.

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS NuStar’s 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. NuStar’s 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. Our other postretirement benefit plans include a contributory medical benefits plan for U.S. employees who retired prior to April 1, 2014, and for employees who retire on or after April 1, 2014, a partial reimbursement for eligible third-party health care premiums. 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 2019 2018 2019 2018 (Thousands of Dollars) For the three months ended March 31: Service cost $ 2,388 $ 2,406 $ 107 $ 126 Interest cost 1,370 1,206 114 108 Expected return on assets (2,004 ) (1,855 ) — — Amortization of prior service credit (514 ) (514 ) (287 ) (287 ) Amortization of net loss 211 544 11 54 Net periodic benefit cost (income) $ 1,451 $ 1,787 $ (55 ) $ 1 The service cost component of net periodic benefit cost (income) is presented in the same income statement line items as other current employee compensation costs, but the remaining components of net periodic benefit cost (income) are reported on the consolidated statements of comprehensive income in “Other income, net.”

SERIES D CUMULATIVE CONVERTIBLE

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS	3 Months Ended
	Mar. 31, 2019
Temporary Equity Disclosure [Abstract]
SERIES D CUMULATIVE COVERTIBLE PREFERRED UNITS	SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Distributions on the Series D Preferred Units accrue and are cumulative from the issuance dates and are payable on the 15th day (or next business day) of each of March, June, September and December, beginning September 17, 2018 to holders of record on the first business day of each payment month. The distribution rate on the Series D Preferred Units is: (i) 9.75% per annum for the first two years; (ii) 10.75% per annum for years three through five; and (iii) the greater of 13.75% per annum or the distribution per common unit thereafter . While the Series D Preferred Units are outstanding, the Partnership will be prohibited from paying distributions on any junior securities, including the common units, unless full cumulative distributions on the Series D Preferred Units (and any parity securities) have been, or contemporaneously are being, paid or set aside for payment through the most recent Series D Preferred Unit distribution payment date. For the four distribution periods beginning with the initial Series D Preferred Unit distribution, the Series D Preferred Unit distributions may be paid, in the Partnership’s sole discretion, in (i) cash or (ii) a combination of additional Series D Preferred Units and cash, provided that up to 50% of the distribution amount may be paid in additional Series D Preferred Units. Thereafter, any Series D Preferred Unit distributions in excess of $0.635 per unit may be paid, in the Partnership’s sole discretion, in additional Series D Preferred Units, with the remainder paid in cash. In April 2019, our board of directors declared distributions of $0.619 per Series D Preferred Unit to be paid on June 17, 2019 .

PARTNERS' EQUITY

PARTNERS' EQUITY	3 Months Ended
	Mar. 31, 2019
Partners' Capital Notes [Abstract]
PARTNERS' EQUITY	PARTNERS' EQUITY Series A, B and C Preferred Units The following table summarizes financial information related to our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively, the Series A, B and C Preferred Units): Preferred Limited Partners Series A Series B Series C Total (Thousands of Dollars) Balance as of January 1, 2019 $ 218,307 $ 371,476 $ 166,518 $ 756,301 Net income 4,813 7,339 3,881 16,033 Distributions to partners (4,813 ) (7,339 ) (3,881 ) (16,033 ) Balance as of March 31, 2019 $ 218,307 $ 371,476 $ 166,518 $ 756,301 Preferred Limited Partners Series A Series B Series C Total (Thousands of Dollars) Balance as of January 1, 2018 $ 218,307 $ 371,634 $ 166,662 $ 756,603 Net income 4,813 7,339 3,838 15,990 Distributions to partners (4,813 ) (7,339 ) (3,838 ) (15,990 ) Other — — (109 ) (109 ) Balance as of March 31, 2018 $ 218,307 $ 371,634 $ 166,553 $ 756,494 Distributions on our preferred units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month as follows (until the distribution rate changes to a floating rate): Units Fixed Distribution Rate Per Unit Per Quarter Fixed Distribution Per Quarter Date at Which Distribution Rate Becomes Floating (Thousands of Dollars) Series A Preferred Units $ 0.53125 $ 4,813 December 15, 2021 Series B Preferred Units $ 0.47657 $ 7,339 June 15, 2022 Series C Preferred Units $ 0.56250 $ 3,881 December 15, 2022 In April 2019, our board of directors declared distributions with respect to the Series A, B and C Preferred Units to be paid on June 17, 2019 . Common Limited Partners We make quarterly distributions to common unitholders of 100% of our “Available Cash,” generally defined as cash receipts less cash disbursements, including distributions to our preferred units , and cash reserves established by the general partner, in its sole discretion. These quarterly distributions are declared and paid within 45 days subsequent to each quarter-end. The common unitholders receive a distribution each quarter as determined by the board of directors, subject to limitation by the distributions in arrears, if any, on our preferred units. The following table summarizes information about quarterly cash distributions declared for our common limited partners: Quarter Ended Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) March 31, 2019 $ 0.60 $ 64,690 May 8, 2019 May 14, 2019 December 31, 2018 $ 0.60 $ 64,336 February 8, 2019 February 13, 2019 Accumulated Other Comprehensive Income (Loss) The balance of and changes in the components included in AOCI were as follows: Foreign Currency Translation Cash Flow Hedges Pension and Other Postretirement Benefits Total (Thousands of Dollars) Balance as of January 1, 2019 $ (47,299 ) $ (893 ) $ (6,686 ) $ (54,878 ) Other comprehensive income (loss): Other comprehensive income (loss) before reclassification adjustments 1,476 (6,808 ) — (5,332 ) Net gain on pension costs reclassified into other income, net — — (579 ) (579 ) Net loss on cash flow hedges reclassified into interest expense, net — 1,078 — 1,078 Other — — 7 7 Other comprehensive income (loss) 1,476 (5,730 ) (572 ) (4,826 ) Balance as of March 31, 2019 $ (45,823 ) $ (6,623 ) $ (7,258 ) $ (59,704 )

NET (LOSS) INCOME PER COMMON UN

NET (LOSS) INCOME PER COMMON UNIT	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
NET (LOSS) INCOME PER COMMON UNIT	NET (LOSS) INCOME PER COMMON UNIT Basic net (loss) 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 restricted units awarded under our long-term incentive plan. We compute basic net (loss) income per common unit by dividing net (loss) income attributable to common units by the weighted-average number of common units outstanding during the period. Diluted net (loss) income per common unit is computed by dividing net (loss) income attributable to common units by the sum of (i) the weighted average number of common units outstanding during the period and (ii) the effect of dilutive potential common units outstanding during the period. Dilutive potential common units may include contingently issuable performance unit awards and the Series D Preferred Units. The Series D Preferred Units are convertible into common units at the option of the holder at any time on or after June 29, 2028. As such, we calculated the dilutive effect of the Series D Preferred Units using the if-converted method. For the three months ended March 31, 2019 , the effect of the assumed conversion of the 23,246,650 Series D Preferred Units outstanding as of March 31, 2019 was antidilutive; therefore, we did not include such conversion in the computation of diluted net (loss) income per common unit. The following table details the calculation of net (loss) income per common unit: Three Months Ended March 31, 2019 2018 (Thousands of Dollars, Except Unit and Per Unit Data) Net (loss) income $ (277,863 ) $ 126,133 Distributions to preferred limited partners (30,423 ) (15,990 ) Distributions to general partner — (1,141 ) Distributions to common limited partners (64,690 ) (55,916 ) Distribution equivalent rights to restricted units (643 ) (445 ) Distributions (in excess of) less than (loss) income $ (373,619 ) $ 52,641 Distributions to common limited partners $ 64,690 $ 55,916 Allocation of distributions (in excess of) less than (loss) earnings (373,619 ) 51,148 Series D Preferred Unit accretion (4,302 ) — Net (loss) income attributable to common units: $ (313,231 ) $ 107,064 Basic weighted-average common units outstanding 107,531,619 93,181,781 Basic net (loss) income per common unit $ (2.91 ) $ 1.15

STATEMENTS OF CASH FLOWS

STATEMENTS OF CASH FLOWS	3 Months Ended
	Mar. 31, 2019
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, 2019 2018 (Thousands of Dollars) Decrease (increase) in current assets: Accounts receivable $ (15,028 ) $ 19,525 Receivable from related party — 133 Inventories (2,302 ) (2,687 ) Other current assets 4,191 3,224 Increase (decrease) in current liabilities: Accounts payable 17,851 (7,681 ) Accrued interest payable (4,948 ) 3,552 Accrued liabilities (30,908 ) (6,019 ) Taxes other than income tax (2,954 ) (1,558 ) Income tax payable 695 2,202 Changes in current assets and current liabilities $ (33,403 ) $ 10,691 The above changes in current assets and current liabilities differ from changes between amounts reflected in the applicable consolidated balance sheets due to: • the change in the amount accrued for capital expenditures; • the effect of foreign currency translation; • changes in the fair values of our interest rate swap agreements; and • the recognition of lease liabilities upon the adoption of ASC Topic 842. Cash flows related to interest and income taxes were as follows: Three Months Ended March 31, 2019 2018 (Thousands of Dollars) Cash paid for interest, net of amount capitalized $ 47,797 $ 42,549 Cash paid for income taxes, net of tax refunds received $ 1,717 $ 2,635 As of March 31, 2019, restricted cash is included in "Prepaid and other current assets" on the consolidated balance sheet. The following table reconciles cash and cash equivalents and restricted cash on the consolidated balance sheets to cash, cash equivalents and restricted cash on the consolidated statements of cash flows: March 31, December 31, (Thousands of Dollars) Cash and cash equivalents $ 15,822 $ 13,644 Restricted cash 8,712 — Cash, cash equivalents and restricted cash $ 24,534 $ 13,644

SEGMENT INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 2019
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, 2019 2018 (Thousands of Dollars) Revenues: Pipeline $ 156,251 $ 136,790 Storage: Third parties 141,150 153,253 Intersegment 1,861 2,075 Total storage 143,011 155,328 Fuels marketing 189,068 185,838 Consolidation and intersegment eliminations (1,861 ) (2,075 ) Total revenues $ 486,469 $ 475,881 Operating income (loss): Pipeline $ 67,304 $ 57,794 Storage (247,240 ) 56,261 Fuels marketing (25,016 ) 6,320 Consolidation and intersegment eliminations (32 ) (3 ) Total segment operating (loss) income (204,984 ) 120,372 General and administrative expenses 25,996 19,774 Other depreciation and amortization expense 2,119 2,118 Total operating (loss) income $ (233,099 ) $ 98,480 Total assets by reportable segment were as follows: March 31, December 31, (Thousands of Dollars) Pipeline $ 3,738,360 $ 3,637,226 Storage 2,259,552 2,424,342 Fuels marketing 129,860 112,906 Total segment assets 6,127,772 6,174,474 Other partnership assets 189,127 174,666 Total consolidated assets $ 6,316,899 $ 6,349,140

CONDENSED CONSOLIDATING FINANCI

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS	3 Months Ended
	Mar. 31, 2019
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, 2019 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 1,363 $ 1,240 $ — $ 13,219 $ — $ 15,822 Receivables, net — 427 1,071 162,241 — 163,739 Inventories — 1,890 5,563 17,570 — 25,023 Prepaid and other current assets 98 17,932 899 2,432 — 21,361 Intercompany receivable — 1,380,677 — 458,238 (1,838,915 ) — Total current assets 1,461 1,402,166 7,533 653,700 (1,838,915 ) 225,945 Property, plant and equipment, net — 1,972,639 608,975 1,562,651 — 4,144,265 Intangible assets, net — 46,751 — 673,449 — 720,200 Goodwill — 149,453 170,652 685,748 — 1,005,853 Investment in wholly owned subsidiaries 2,983,036 1,751,576 1,130,709 536,042 (6,401,363 ) — Other long-term assets, net 329 113,954 32,779 73,574 — 220,636 Total assets $ 2,984,826 $ 5,436,539 $ 1,950,648 $ 4,185,164 $ (8,240,278 ) $ 6,316,899 Liabilities, Mezzanine Equity and Partners’ Equity Accounts payable $ 5,996 $ 52,993 $ 5,258 $ 112,624 $ — $ 176,871 Short-term debt and current portion of finance leases — 9,302 17 16 — 9,335 Accrued interest payable — 31,121 — 41 — 31,162 Accrued liabilities 895 27,683 8,805 45,351 — 82,734 Taxes other than income tax 42 4,967 6,371 4,759 — 16,139 Income tax payable — 573 2 4,570 — 5,145 Intercompany payable 461,219 — 1,377,696 — (1,838,915 ) — Total current liabilities 468,152 126,639 1,398,149 167,361 (1,838,915 ) 321,386 Long-term debt — 3,281,179 66 51,975 — 3,333,220 Deferred income tax liability — 1,675 9 10,103 — 11,787 Other long-term liabilities — 83,436 16,534 93,566 — 193,536 Series D preferred units 568,293 — — — — 568,293 Total partners’ equity 1,948,381 1,943,610 535,890 3,862,159 (6,401,363 ) 1,888,677 Total liabilities, mezzanine equity and partners’ equity $ 2,984,826 $ 5,436,539 $ 1,950,648 $ 4,185,164 $ (8,240,278 ) $ 6,316,899 Condensed Consolidating Balance Sheets December 31, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 1,255 $ 51 $ — $ 12,338 $ — $ 13,644 Receivables, net — 2,212 — 146,096 — 148,308 Inventories — 1,741 5,237 15,735 — 22,713 Prepaid and other current assets 61 14,422 908 2,102 — 17,493 Intercompany receivable — 1,327,833 — 500,583 (1,828,416 ) — Total current assets 1,316 1,346,259 6,145 676,854 (1,828,416 ) 202,158 Property, plant and equipment, net — 1,858,264 615,549 1,814,809 — 4,288,622 Intangible assets, net — 49,107 — 683,949 — 733,056 Goodwill — 149,453 170,652 716,871 — 1,036,976 Investment in wholly owned subsidiaries 3,355,636 1,750,256 1,425,283 857,485 (7,388,660 ) — Other long-term assets, net 304 54,429 26,716 6,879 — 88,328 Total assets $ 3,357,256 $ 5,207,768 $ 2,244,345 $ 4,756,847 $ (9,217,076 ) $ 6,349,140 Liabilities, Mezzanine Equity and Partners’ Equity Accounts payable $ 6,460 $ 39,680 $ 6,331 $ 90,650 $ — $ 143,121 Short-term debt — 18,500 — — — 18,500 Accrued interest payable — 36,253 — 40 — 36,293 Accrued liabilities 1,280 24,858 8,082 67,773 — 101,993 Taxes other than income tax 125 7,285 4,718 6,955 — 19,083 Income tax payable — 457 2 3,986 — 4,445 Intercompany payable 472,790 — 1,355,626 — (1,828,416 ) — Total current liabilities 480,655 127,033 1,374,759 169,404 (1,828,416 ) 323,435 Long-term debt — 3,050,531 — 61,465 — 3,111,996 Deferred income tax liability — 1,675 9 10,744 — 12,428 Other long-term liabilities — 28,392 12,348 38,818 — 79,558 Series D preferred units 563,992 — — — — 563,992 Total partners’ equity 2,312,609 2,000,137 857,229 4,476,416 (7,388,660 ) 2,257,731 Total liabilities, mezzanine equity and partners’ equity $ 3,357,256 $ 5,207,768 $ 2,244,345 $ 4,756,847 $ (9,217,076 ) $ 6,349,140 Condensed Consolidating Statements of Comprehensive Loss For the Three Months Ended March 31, 2019 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 117,555 $ 58,353 $ 310,748 $ (187 ) $ 486,469 Costs and expenses 676 77,411 36,050 605,618 (187 ) 719,568 Operating (loss) income (676 ) 40,144 22,303 (294,870 ) — (233,099 ) Equity in (loss) earnings of subsidiaries (277,295 ) 1,339 (294,048 ) (274,174 ) 844,178 — Interest income (expense), net 108 (45,456 ) (1,933 ) 3,013 — (44,268 ) Other income (expense), net — 754 177 (144 ) — 787 Loss before income tax expense (277,863 ) (3,219 ) (273,501 ) (566,175 ) 844,178 (276,580 ) Income tax expense — 117 — 1,166 — 1,283 Net loss $ (277,863 ) $ (3,336 ) $ (273,501 ) $ (567,341 ) $ 844,178 $ (277,863 ) Comprehensive loss $ (277,863 ) $ (9,066 ) $ (273,501 ) $ (566,437 ) $ 844,178 $ (282,689 ) 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 Cash Flows For the Three Months Ended March 31, 2019 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 93,209 $ 26,732 $ 11,953 $ 113,864 $ (142,190 ) $ 103,568 Cash flows from investing activities: Capital expenditures — (87,696 ) (2,253 ) (69,480 ) — (159,429 ) Change in accounts payable related to capital expenditures — 14,894 15,532 (11,025 ) — 19,401 Proceeds from sale or disposition of assets — 46 1 32 — 79 Net cash (used in) provided by investing activities — (72,756 ) 13,280 (80,473 ) — (139,949 ) Cash flows from financing activities: Debt borrowings — 306,500 — 5,000 — 311,500 Debt repayments — (143,500 ) — (14,600 ) — (158,100 ) Distributions to preferred unitholders (30,423 ) (15,212 ) (15,212 ) (15,211 ) 45,635 (30,423 ) Distributions to common unitholders (64,367 ) (32,183 ) (32,183 ) (32,189 ) 96,555 (64,367 ) Net intercompany activity 8,948 (55,453 ) 22,164 24,341 — — Payment of tax withholding for unit-based compensation (6,366 ) — — — — (6,366 ) Other, net (893 ) (4,227 ) (2 ) (5 ) — (5,127 ) Net cash (used in) provided by financing activities (93,101 ) 55,925 (25,233 ) (32,664 ) 142,190 47,117 Effect of foreign exchange rate changes on cash — — — 154 — 154 Net increase in cash, cash equivalents and restricted cash 108 9,901 — 881 — 10,890 Cash, cash equivalents, and restricted cash as of the beginning of the period 1,255 51 — 12,338 — 13,644 Cash, cash equivalents and restricted cash as of the end of the period $ 1,363 $ 9,952 $ — $ 13,219 $ — $ 24,534 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

SUBSEQUENT EVENT

SUBSEQUENT EVENT	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENT In April 2019, our common unitholders approved the 2019 Long-Term Incentive Plan (2019 LTIP) for eligible employees, consultants and directors of NuStar Energy L.P., and of NuStar GP, LLC, and their respective affiliates who perform services for us and our subsidiaries. The 2019 LTIP allows for the awarding of (i) options; (ii) restricted units; (iii) distribution equivalent rights; (iv) performance cash; (v) performance units; and (vi) unit awards. The 2019 LTIP permits the granting of awards totaling an aggregate of 2,500,000 common units, subject to adjustment as provided in the 2019 LTIP. The 2019 LTIP generally will be administered by the compensation committee of our board of directors.

ORGANIZATION AND BASIS OF PRE_2

ORGANIZATION AND BASIS OF PRESENTATION (Policies)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted Cash [Policy Text Block]	New Accounting Policy As of March 31, 2019, we have restricted cash representing legally restricted funds that are unavailable for general use totaling $8.7 million , which is included in “Prepaid and other current assets” on the consolidated balance sheet.

LEASE ASSETS AND LIABILITIES Le

LEASE ASSETS AND LIABILITIES Leases (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Lessee, Leases [Policy Text Block]	Lessee Arrangements We elected the following practical expedients permitted under the transition guidance within the new standard: • the package of practical expedients, which, among other things, allowed us to carry forward historical lease classification; • the practical expedient specifically related to land easements, which, among other things, allowed us to carry forward our historical accounting treatment for existing land easement agreement; and • the lessee practical expedient to combine lease and non-lease components for all of our asset classes except the other pipeline and terminal equipment asset class. We record all leases on our consolidated balance sheet except for those leases with an initial term of 12 months or less, which are expensed on a straight-line basis over the lease term. We use judgment in determining the reasonably certain lease term and consider factors such as the nature and utility of the leased asset, as well as the importance of the leased asset to our operations. We calculate the present value of our lease liabilities based upon our incremental borrowing rate unless the rate implicit in the lease is readily determinable.
Lessor, Leases [Policy Text Block]	Lessor Arrangements We elected the following practical expedients permitted under the transition guidance within the new standard: • the package of practical expedients, which, among other things, allowed us to carry forward historical lease classification; and • the lessor practical expedient to combine lease and non-lease components and to account for the transaction based on the predominant component (i.e., ASC Topic 842 or ASC Topic 606, “Revenue from Contracts with Customers”). We apply this expedient to certain contracts in which we agree to provide both storage capacity and optional services to customers. We use judgment in determining the reasonably certain lease term.

REVENUE FROM CONTRACTS WITH C_2

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset and Liability [Table Text Block]	The following table provides information about contract assets and contract liabilities from contracts with customers: 2019 2018 Contract Assets Contract Liabilities Contract Assets Contract Liabilities (Thousands of Dollars) Balance as of January 1 $ 2,605 $ (85,881 ) $ 2,127 $ (57,870 ) Additions 941 (11,094 ) 460 (2,386 ) Transfer to accounts receivable (1,272 ) — (1,653 ) — Transfer to revenues — 34,714 — 2,935 Total activity (331 ) 23,620 (1,193 ) 549 Balance as of March 31 2,274 (62,261 ) 934 (57,321 ) Less current portion 1,381 (21,798 ) 749 (13,579 ) Noncurrent portion $ 893 $ (40,463 ) $ 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, 2019 (in thousands of dollars): 2019 (remaining) $ 336,361 2020 374,486 2021 258,906 2022 215,033 2023 165,288 Thereafter 365,808 Total $ 1,715,882
Disaggregation of Revenue [Table Text Block]	The following table disaggregates our revenues: Three Months Ended March 31, 2019 2018 (Thousands of Dollars) Pipeline segment: Crude oil pipelines $ 68,478 $ 53,437 Refined products and ammonia pipelines (excluding lessor revenues) 85,106 83,299 Total pipeline segment revenues from contracts with customers 153,584 136,736 Lessor revenues 2,667 54 Total pipeline segment revenues 156,251 136,790 Storage segment: Throughput terminals 21,686 20,016 Storage terminals (excluding lessor revenues) 111,132 125,350 Total storage segment revenues from contracts with customers 132,818 145,366 Lessor revenues 10,193 9,962 Total storage segment revenues 143,011 155,328 Fuels marketing segment: Revenues from contracts with customers 189,068 185,838 Consolidation and intersegment eliminations (1,861 ) (2,075 ) Total revenues $ 486,469 $ 475,881

LEASE ASSETS AND LIABILITIES (T

LEASE ASSETS AND LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Schedule of Right-of-Use Assets and Lease Liabilities	As of March 31, 2019, right-of-use assets and lease liabilities included in our consolidated balance sheet were as follows: Balance Sheet Location March 31, 2019 (Thousands of Dollars) Right-of-Use Assets: Operating Other long-term assets, net $ 125,531 Finance Property, plant and equipment, net of accumulated amortization of $841 $ 73,824 Lease Liabilities: Operating: Current Accrued liabilities $ 24,178 Noncurrent Other long-term liabilities 101,295 Total operating lease liabilities $ 125,473 Finance: Current Short-term debt and current portion of finance leases $ 3,835 Noncurrent Long-term debt 55,386 Total finance lease liabilities $ 59,221
Maturity Analysis of Lease Liabilities	As of March 31, 2019, maturities of our operating and finance lease liabilities were as follows: Operating Leases Finance Leases (Thousands of Dollars) 2019 (remaining) $ 22,446 $ 4,341 2020 17,014 5,788 2021 13,177 4,338 2022 12,619 3,719 2023 11,651 3,714 Thereafter 79,788 63,222 Total lease payments $ 156,695 $ 85,122 Less: Interest 31,222 25,901 Present value of lease liabilities $ 125,473 $ 59,221
Lease Cost	Costs incurred for leases were as follows: Three Months Ended March 31, 2019 (Thousands of Dollars) Operating lease cost $ 9,464 Finance lease cost: Amortization of right-of-use assets 841 Interest expense on lease liability 548 Short-term lease cost 4,314 Variable lease cost 812 Total lease cost $ 15,979
Additional Lease Information	The table below presents additional information regarding our leases: Operating Leases Finance Leases (Thousands of Dollars, Except Term and Rate Data) For the three months ended March 31, 2019: Cash outflows from operating activities $ 9,248 $ 364 Cash outflows from financing activities $ — $ 618 Right-of-use assets obtained in exchange for lease liabilities $ 1,267 $ 393 As of March 31, 2019: Weighted-average remaining lease term (in years) 12 22 Weighted-average discount rate 3.6 % 3.7 %

DERIVATIVES AND FAIR VALUE ME_2

DERIVATIVES AND FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Mar. 31, 2019
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 interest rate swaps 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) Other long-term assets, net $ — $ 627 $ — $ — Other long-term liabilities $ — $ — $ (6,932 ) $ (751 )
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block]	Our interest rate swaps had the following impact on earnings: Three Months Ended March 31, 2019 2018 (Thousands of Dollars) (Loss) gain recognized in other comprehensive (loss) income on derivative $ (6,808 ) $ 17,421 Loss reclassified from AOCI into interest expense, net $ (1,078 ) $ (1,390 )
Fair Value and Carrying Value of Debt [Table Text Block]	The estimated fair values and carrying amounts of long-term debt, excluding finance leases, were as follows: March 31, 2019 December 31, 2018 (Thousands of Dollars) Fair value $ 3,317,920 $ 3,056,704 Carrying amount $ 3,277,834 $ 3,111,996

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	3 Months Ended
	Mar. 31, 2019
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 2019 2018 2019 2018 (Thousands of Dollars) For the three months ended March 31: Service cost $ 2,388 $ 2,406 $ 107 $ 126 Interest cost 1,370 1,206 114 108 Expected return on assets (2,004 ) (1,855 ) — — Amortization of prior service credit (514 ) (514 ) (287 ) (287 ) Amortization of net loss 211 544 11 54 Net periodic benefit cost (income) $ 1,451 $ 1,787 $ (55 ) $ 1

PARTNERS' EQUITY (Tables)

PARTNERS' EQUITY (Tables)	3 Months Ended
	Mar. 31, 2019
Partners' Capital Notes [Abstract]
Schedule of Preferred Units [Table Text Block]	The following table summarizes financial information related to our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively, the Series A, B and C Preferred Units): Preferred Limited Partners Series A Series B Series C Total (Thousands of Dollars) Balance as of January 1, 2019 $ 218,307 $ 371,476 $ 166,518 $ 756,301 Net income 4,813 7,339 3,881 16,033 Distributions to partners (4,813 ) (7,339 ) (3,881 ) (16,033 ) Balance as of March 31, 2019 $ 218,307 $ 371,476 $ 166,518 $ 756,301 Preferred Limited Partners Series A Series B Series C Total (Thousands of Dollars) Balance as of January 1, 2018 $ 218,307 $ 371,634 $ 166,662 $ 756,603 Net income 4,813 7,339 3,838 15,990 Distributions to partners (4,813 ) (7,339 ) (3,838 ) (15,990 ) Other — — (109 ) (109 ) Balance as of March 31, 2018 $ 218,307 $ 371,634 $ 166,553 $ 756,494
Distributions Made to Limited Partner, by Distribution [Table Text Block]	The following table summarizes information about quarterly cash distributions declared for our common limited partners: Quarter Ended Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) March 31, 2019 $ 0.60 $ 64,690 May 8, 2019 May 14, 2019 December 31, 2018 $ 0.60 $ 64,336 February 8, 2019 February 13, 2019 Distributions on our preferred units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month as follows (until the distribution rate changes to a floating rate): Units Fixed Distribution Rate Per Unit Per Quarter Fixed Distribution Per Quarter Date at Which Distribution Rate Becomes Floating (Thousands of Dollars) Series A Preferred Units $ 0.53125 $ 4,813 December 15, 2021 Series B Preferred Units $ 0.47657 $ 7,339 June 15, 2022 Series C Preferred Units $ 0.56250 $ 3,881 December 15, 2022
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The balance of and changes in the components included in AOCI were as follows: Foreign Currency Translation Cash Flow Hedges Pension and Other Postretirement Benefits Total (Thousands of Dollars) Balance as of January 1, 2019 $ (47,299 ) $ (893 ) $ (6,686 ) $ (54,878 ) Other comprehensive income (loss): Other comprehensive income (loss) before reclassification adjustments 1,476 (6,808 ) — (5,332 ) Net gain on pension costs reclassified into other income, net — — (579 ) (579 ) Net loss on cash flow hedges reclassified into interest expense, net — 1,078 — 1,078 Other — — 7 7 Other comprehensive income (loss) 1,476 (5,730 ) (572 ) (4,826 ) Balance as of March 31, 2019 $ (45,823 ) $ (6,623 ) $ (7,258 ) $ (59,704 )

NET (LOSS) INCOME PER COMMON _2

NET (LOSS) INCOME PER COMMON UNIT (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of Net (Loss) Income Per Common Unit	The following table details the calculation of net (loss) income per common unit: Three Months Ended March 31, 2019 2018 (Thousands of Dollars, Except Unit and Per Unit Data) Net (loss) income $ (277,863 ) $ 126,133 Distributions to preferred limited partners (30,423 ) (15,990 ) Distributions to general partner — (1,141 ) Distributions to common limited partners (64,690 ) (55,916 ) Distribution equivalent rights to restricted units (643 ) (445 ) Distributions (in excess of) less than (loss) income $ (373,619 ) $ 52,641 Distributions to common limited partners $ 64,690 $ 55,916 Allocation of distributions (in excess of) less than (loss) earnings (373,619 ) 51,148 Series D Preferred Unit accretion (4,302 ) — Net (loss) income attributable to common units: $ (313,231 ) $ 107,064 Basic weighted-average common units outstanding 107,531,619 93,181,781 Basic net (loss) income per common unit $ (2.91 ) $ 1.15

STATEMENTS OF CASH FLOWS (Table

STATEMENTS OF CASH FLOWS (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 2018 (Thousands of Dollars) Decrease (increase) in current assets: Accounts receivable $ (15,028 ) $ 19,525 Receivable from related party — 133 Inventories (2,302 ) (2,687 ) Other current assets 4,191 3,224 Increase (decrease) in current liabilities: Accounts payable 17,851 (7,681 ) Accrued interest payable (4,948 ) 3,552 Accrued liabilities (30,908 ) (6,019 ) Taxes other than income tax (2,954 ) (1,558 ) Income tax payable 695 2,202 Changes in current assets and current liabilities $ (33,403 ) $ 10,691
Schedule of Supplemental Cash Flow Information [Text Block]	Cash flows related to interest and income taxes were as follows: Three Months Ended March 31, 2019 2018 (Thousands of Dollars) Cash paid for interest, net of amount capitalized $ 47,797 $ 42,549 Cash paid for income taxes, net of tax refunds received $ 1,717 $ 2,635 The following table reconciles cash and cash equivalents and restricted cash on the consolidated balance sheets to cash, cash equivalents and restricted cash on the consolidated statements of cash flows: March 31, December 31, (Thousands of Dollars) Cash and cash equivalents $ 15,822 $ 13,644 Restricted cash 8,712 — Cash, cash equivalents and restricted cash $ 24,534 $ 13,644

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 2018 (Thousands of Dollars) Revenues: Pipeline $ 156,251 $ 136,790 Storage: Third parties 141,150 153,253 Intersegment 1,861 2,075 Total storage 143,011 155,328 Fuels marketing 189,068 185,838 Consolidation and intersegment eliminations (1,861 ) (2,075 ) Total revenues $ 486,469 $ 475,881 Operating income (loss): Pipeline $ 67,304 $ 57,794 Storage (247,240 ) 56,261 Fuels marketing (25,016 ) 6,320 Consolidation and intersegment eliminations (32 ) (3 ) Total segment operating (loss) income (204,984 ) 120,372 General and administrative expenses 25,996 19,774 Other depreciation and amortization expense 2,119 2,118 Total operating (loss) income $ (233,099 ) $ 98,480
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 $ 3,738,360 $ 3,637,226 Storage 2,259,552 2,424,342 Fuels marketing 129,860 112,906 Total segment assets 6,127,772 6,174,474 Other partnership assets 189,127 174,666 Total consolidated assets $ 6,316,899 $ 6,349,140

CONDENSED CONSOLIDATING FINAN_2

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Tables)	3 Months Ended
	Mar. 31, 2019
CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]
Condensed Consolidating Balance Sheets [Text Block]	Condensed Consolidating Balance Sheets March 31, 2019 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 1,363 $ 1,240 $ — $ 13,219 $ — $ 15,822 Receivables, net — 427 1,071 162,241 — 163,739 Inventories — 1,890 5,563 17,570 — 25,023 Prepaid and other current assets 98 17,932 899 2,432 — 21,361 Intercompany receivable — 1,380,677 — 458,238 (1,838,915 ) — Total current assets 1,461 1,402,166 7,533 653,700 (1,838,915 ) 225,945 Property, plant and equipment, net — 1,972,639 608,975 1,562,651 — 4,144,265 Intangible assets, net — 46,751 — 673,449 — 720,200 Goodwill — 149,453 170,652 685,748 — 1,005,853 Investment in wholly owned subsidiaries 2,983,036 1,751,576 1,130,709 536,042 (6,401,363 ) — Other long-term assets, net 329 113,954 32,779 73,574 — 220,636 Total assets $ 2,984,826 $ 5,436,539 $ 1,950,648 $ 4,185,164 $ (8,240,278 ) $ 6,316,899 Liabilities, Mezzanine Equity and Partners’ Equity Accounts payable $ 5,996 $ 52,993 $ 5,258 $ 112,624 $ — $ 176,871 Short-term debt and current portion of finance leases — 9,302 17 16 — 9,335 Accrued interest payable — 31,121 — 41 — 31,162 Accrued liabilities 895 27,683 8,805 45,351 — 82,734 Taxes other than income tax 42 4,967 6,371 4,759 — 16,139 Income tax payable — 573 2 4,570 — 5,145 Intercompany payable 461,219 — 1,377,696 — (1,838,915 ) — Total current liabilities 468,152 126,639 1,398,149 167,361 (1,838,915 ) 321,386 Long-term debt — 3,281,179 66 51,975 — 3,333,220 Deferred income tax liability — 1,675 9 10,103 — 11,787 Other long-term liabilities — 83,436 16,534 93,566 — 193,536 Series D preferred units 568,293 — — — — 568,293 Total partners’ equity 1,948,381 1,943,610 535,890 3,862,159 (6,401,363 ) 1,888,677 Total liabilities, mezzanine equity and partners’ equity $ 2,984,826 $ 5,436,539 $ 1,950,648 $ 4,185,164 $ (8,240,278 ) $ 6,316,899 Condensed Consolidating Balance Sheets December 31, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 1,255 $ 51 $ — $ 12,338 $ — $ 13,644 Receivables, net — 2,212 — 146,096 — 148,308 Inventories — 1,741 5,237 15,735 — 22,713 Prepaid and other current assets 61 14,422 908 2,102 — 17,493 Intercompany receivable — 1,327,833 — 500,583 (1,828,416 ) — Total current assets 1,316 1,346,259 6,145 676,854 (1,828,416 ) 202,158 Property, plant and equipment, net — 1,858,264 615,549 1,814,809 — 4,288,622 Intangible assets, net — 49,107 — 683,949 — 733,056 Goodwill — 149,453 170,652 716,871 — 1,036,976 Investment in wholly owned subsidiaries 3,355,636 1,750,256 1,425,283 857,485 (7,388,660 ) — Other long-term assets, net 304 54,429 26,716 6,879 — 88,328 Total assets $ 3,357,256 $ 5,207,768 $ 2,244,345 $ 4,756,847 $ (9,217,076 ) $ 6,349,140 Liabilities, Mezzanine Equity and Partners’ Equity Accounts payable $ 6,460 $ 39,680 $ 6,331 $ 90,650 $ — $ 143,121 Short-term debt — 18,500 — — — 18,500 Accrued interest payable — 36,253 — 40 — 36,293 Accrued liabilities 1,280 24,858 8,082 67,773 — 101,993 Taxes other than income tax 125 7,285 4,718 6,955 — 19,083 Income tax payable — 457 2 3,986 — 4,445 Intercompany payable 472,790 — 1,355,626 — (1,828,416 ) — Total current liabilities 480,655 127,033 1,374,759 169,404 (1,828,416 ) 323,435 Long-term debt — 3,050,531 — 61,465 — 3,111,996 Deferred income tax liability — 1,675 9 10,744 — 12,428 Other long-term liabilities — 28,392 12,348 38,818 — 79,558 Series D preferred units 563,992 — — — — 563,992 Total partners’ equity 2,312,609 2,000,137 857,229 4,476,416 (7,388,660 ) 2,257,731 Total liabilities, mezzanine equity and partners’ equity $ 3,357,256 $ 5,207,768 $ 2,244,345 $ 4,756,847 $ (9,217,076 ) $ 6,349,140
Condensed Consolidating Statements of Comprehensive Income (Loss) [Table Text Block]	Condensed Consolidating Statements of Comprehensive Loss For the Three Months Ended March 31, 2019 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 117,555 $ 58,353 $ 310,748 $ (187 ) $ 486,469 Costs and expenses 676 77,411 36,050 605,618 (187 ) 719,568 Operating (loss) income (676 ) 40,144 22,303 (294,870 ) — (233,099 ) Equity in (loss) earnings of subsidiaries (277,295 ) 1,339 (294,048 ) (274,174 ) 844,178 — Interest income (expense), net 108 (45,456 ) (1,933 ) 3,013 — (44,268 ) Other income (expense), net — 754 177 (144 ) — 787 Loss before income tax expense (277,863 ) (3,219 ) (273,501 ) (566,175 ) 844,178 (276,580 ) Income tax expense — 117 — 1,166 — 1,283 Net loss $ (277,863 ) $ (3,336 ) $ (273,501 ) $ (567,341 ) $ 844,178 $ (277,863 ) Comprehensive loss $ (277,863 ) $ (9,066 ) $ (273,501 ) $ (566,437 ) $ 844,178 $ (282,689 ) 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 Cash Flows [Text Block]	Condensed Consolidating Statements of Cash Flows For the Three Months Ended March 31, 2019 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 93,209 $ 26,732 $ 11,953 $ 113,864 $ (142,190 ) $ 103,568 Cash flows from investing activities: Capital expenditures — (87,696 ) (2,253 ) (69,480 ) — (159,429 ) Change in accounts payable related to capital expenditures — 14,894 15,532 (11,025 ) — 19,401 Proceeds from sale or disposition of assets — 46 1 32 — 79 Net cash (used in) provided by investing activities — (72,756 ) 13,280 (80,473 ) — (139,949 ) Cash flows from financing activities: Debt borrowings — 306,500 — 5,000 — 311,500 Debt repayments — (143,500 ) — (14,600 ) — (158,100 ) Distributions to preferred unitholders (30,423 ) (15,212 ) (15,212 ) (15,211 ) 45,635 (30,423 ) Distributions to common unitholders (64,367 ) (32,183 ) (32,183 ) (32,189 ) 96,555 (64,367 ) Net intercompany activity 8,948 (55,453 ) 22,164 24,341 — — Payment of tax withholding for unit-based compensation (6,366 ) — — — — (6,366 ) Other, net (893 ) (4,227 ) (2 ) (5 ) — (5,127 ) Net cash (used in) provided by financing activities (93,101 ) 55,925 (25,233 ) (32,664 ) 142,190 47,117 Effect of foreign exchange rate changes on cash — — — 154 — 154 Net increase in cash, cash equivalents and restricted cash 108 9,901 — 881 — 10,890 Cash, cash equivalents, and restricted cash as of the beginning of the period 1,255 51 — 12,338 — 13,644 Cash, cash equivalents and restricted cash as of the end of the period $ 1,363 $ 9,952 $ — $ 13,219 $ — $ 24,534 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

ORGANIZATION AND BASIS OF PRE_3

ORGANIZATION AND BASIS OF PRESENTATION Narrative 1 (Details) shares in Millions	3 Months Ended
	Mar. 31, 2019	Sep. 30, 2018shares	Jul. 20, 2018Rate
Class of Stock [Line Items]
Common unit conversion rate | Rate			55.00%
Number of business segments	3
Common Limited Partner [Member]
Class of Stock [Line Items]
Issuance of NuStar Energy common units as a result of the Merger, incremental units issued | shares		13.4

ORGANIZATION AND BASIS OF PRE_4

ORGANIZATION AND BASIS OF PRESENTATION Narrative 2 (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Prepaid and other current assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 8,712	$ 0

NEW ACCOUNTING PRONOUNCEMENTS N

NEW ACCOUNTING PRONOUNCEMENTS Narrative (Details)	3 Months Ended
	Mar. 31, 2019
Leases [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Transition adjustment	The transition adjustment related to the adoption was immaterial

IMPAIRMENTS Narrative (Details)

IMPAIRMENTS Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	May 09, 2019	Dec. 31, 2018
Goodwill impairment loss	$ 31,123,000	$ 0
Goodwill	1,005,853,000			$ 1,036,976,000
Asset impairment loss	297,317,000	$ 0
St. Eustatius Bunkers [Member]
Goodwill impairment loss	31,100,000
Goodwill	$ 0
Scenario, Forecast [Member]
Divestiture of business, sales price, St. Eustatius terminal and bunkering operations			$ 250,000,000

REVENUE FROM CONTRACTS WITH C_3

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 1 - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Contract assets
Balance as of January 1	$ 2,605	$ 2,127
Additions	941	460
Transfer to accounts receivable	(1,272)	(1,653)
Total activity	(331)	(1,193)
Balance as of March 31	2,274	934
Less current portion	1,381	749
Noncurrent portion	893	185
Contract liabilities
Balance as of January 1	(85,881)	(57,870)
Additions	(11,094)	(2,386)
Transfer to revenues	34,714	2,935
Total activity	23,620	549
Balance as of March 31	(62,261)	(57,321)
Less current portion	(21,798)	(13,579)
Noncurrent portion	$ (40,463)	$ (43,742)

REVENUE FROM CONTRACTS WITH C_4

REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue recognized	$ 34,714	$ 2,935
Petroleos de Venezuela, S.A. (PDVSA) [Member]
Revenue recognized	$ 16,300

REVENUE FROM CONTRACTS WITH C_5

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 2 - Expected Timing of Satisfaction of Performance Obligations (Details) $ in Thousands	Mar. 31, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 336,361
Revenue, remaining performance obligation, expected timing of satisfaction, period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 374,486
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 258,906
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 215,033
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 165,288
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,715,882
Revenue, remaining performance obligation, expected timing of satisfaction, period

REVENUE FROM CONTRACTS WITH C_6

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 3 - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 486,469	$ 475,881
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Total revenues	(1,861)	(2,075)
Pipeline Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	153,584	136,736
Lessor revenues	2,667	54
Total revenues	156,251	136,790
Pipeline Segment | Crude Oil Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	68,478	53,437
Pipeline Segment | Refined Products and Ammonia Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	85,106	83,299
Storage Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	132,818	145,366
Lessor revenues	10,193	9,962
Total revenues	143,011	155,328
Storage Segment | Throughput Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	21,686	20,016
Storage Segment | Storage Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	111,132	125,350
Fuels Marketing Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	189,068	185,838
Total revenues	$ 189,068	$ 185,838

DEBT Narrative (Details)

DEBT Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt		$ 3,277,834	$ 3,111,996
Logistics revolving credit agreement [Member]
Debt Instrument [Line Items]
Long-term debt		921,000
Maximum borrowing capacity		$ 1,400,000
Interest rate at period end - Revolving Credit Agreement		4.50%
Covenant terms		The consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) could not exceed 5.00-to-1.00 and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00 for each rolling period of four quarters.
Current remaining borrowing capacity		$ 475,400
Receivables Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term debt		52,200
Maximum borrowing capacity		$ 125,000
Weighted average interest rate		3.40%
Collateral amount		$ 107,500
Standard & Poor's, BB Rating [Member]
Debt Instrument [Line Items]
Credit rating		BB
Subsequent Event [Member] | Standard & Poor's, BB- Rating [Member]
Debt Instrument [Line Items]
Credit rating	BB-

COMMITMENTS AND CONTINGENCIES N

COMMITMENTS AND CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Loss contingency accrual, at carrying value	$ 2.8	$ 2.8

LEASE ASSETS AND LIABILITIES Na

LEASE ASSETS AND LIABILITIES Narrative 1 (Details) $ in Millions	Jan. 01, 2019USD ($)
Leases [Abstract]
Right-of-use assets recognized at transition	$ 207
Lease liabilities recognized at transition	$ 192

LEASE ASSETS AND LIABILITIES _2

LEASE ASSETS AND LIABILITIES Narrative 2 (Details)	3 Months Ended
	Mar. 31, 2019
Operating Lease Type [Line Items]
Lessee, operating lease, description	Our operating leases consist primarily of leases for tugs and barges utilized at our St. Eustatius facility for bunker fuel sales and land and dock leases at various terminal facilities.
Lessee, Finance Lease, Description [Abstract]
Lessee, finance lease, description	The primary component of our finance lease portfolio is a dock at a terminal facility, which includes a commitment for minimum dockage and wharfage throughput volumes.
Lessee, finance lease, remaining term	2 years
Number of renewal periods	4
Lessee, finance lease, renewal term	5 years
St Eustatius Tugs and Barges [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, renewal term	10 years
St Eustatius Tugs and Barges [Member] | Minimum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	1 year
St Eustatius Tugs and Barges [Member] | Maximum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	9 years
Land and Dock Leases [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, renewal term	15 years
Land and Dock Leases [Member] | Minimum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	3 years
Land and Dock Leases [Member] | Maximum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	17 years

LEASE ASSETS AND LIABILITIES Ta

LEASE ASSETS AND LIABILITIES Table 1 - Schedule of Right-of-Use Assets and Lease Liabilities (Details)	Mar. 31, 2019USD ($)
Right-of-Use Assets:
Accumulated amortization on finance right-of-use asset	$ 841,000
Lease Liabilities:
Total operating lease liabilities	125,473,000
Total finance lease liabilities	59,221,000
Other long-term assets, net
Right-of-Use Assets:
Operating lease	125,531,000
Property, Plant and Equipment, net [Member]
Right-of-Use Assets:
Finance lease	73,824,000
Accrued Liabilities [Member]
Lease Liabilities:
Operating lease, current	24,178,000
Other long-term liabilities
Lease Liabilities:
Operating lease, noncurrent	101,295,000
Short-term Debt and Current Portion of Finance Leases [Member]
Lease Liabilities:
Finance lease, current	3,835,000
Long-term Debt [Member]
Lease Liabilities:
Finance lease, noncurrent	$ 55,386,000

LEASE ASSETS AND LIABILITIES _3

LEASE ASSETS AND LIABILITIES Table 2 - Maturity Analysis of Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019 (remaining)	$ 22,446
2020	17,014
2021	13,177
2022	12,619
2023	11,651
Thereafter	79,788
Total lease payments	156,695
Less: Interest	31,222
Present value of lease liabilities	125,473
Finance Lease Liabilities, Payments, Due [Abstract]
2019 (remaining)	4,341
2020	5,788
2021	4,338
2022	3,719
2023	3,714
Thereafter	63,222
Total lease payments	85,122
Less: Interest	25,901
Present value of lease liabilities	$ 59,221

LEASE ASSETS AND LIABILITIES _4

LEASE ASSETS AND LIABILITIES Table 3 - Lease Cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 9,464
Amortization of right-of-use assets	841
Interest expense on lease liability	548
Short-term lease cost	4,314
Variable lease cost	812
Total lease cost	$ 15,979

LEASE ASSETS AND LIABILITIES _5

LEASE ASSETS AND LIABILITIES Table 4 - Additional Lease Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)Rate
Leases, Operating [Abstract]
Cash outflows from operating activities	$ 9,248
Right-of-use assets obtained in exchange for lease liabilities	$ 1,267
Weighted-average remaining lease term (in years)	12 years
Weighted-average discount rate | Rate	3.60%
Leases, Finance [Abstract]
Cash outflows from operating activities	$ 364
Cash outflows from financing activities	618
Right-of-use assets obtained in exchange for lease liabilities	$ 393
Weighted-average remaining lease term (in years)	22 years
Weighted-average discount rate | Rate	3.70%

LEASE ASSETS AND LIABILITIES _6

LEASE ASSETS AND LIABILITIES Narrative 3 (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Operating Leased Assets [Line Items]
Lessor, operating lease, term of contract	10 years
Lessor, operating lease, expected minimum lease payments	$ 303.2
Lessor, operating lease, remaining term of contract	8 years
Pipeline, storage and terminals
Operating Leased Assets [Line Items]
Lease storage assets, estimated useful life	30 years
Lease storage assets, cost	$ 233.3
Lease storage assets, accumulated depreciation	115.2
Service revenues [Member]
Operating Leased Assets [Line Items]
Lessor, operating lease, lease revenues	$ 10.2

DERIVATIVES AND FAIR VALUE ME_3

DERIVATIVES AND FAIR VALUE MEASUREMENTS Narrative (Details) - Interest rate swaps - Cash Flow Hedges - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [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	$ 250	$ 250

DERIVATIVES AND FAIR VALUE ME_4

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 1 - Fair Values of Derivative Instruments (Details) - Fair Value, Inputs, Level 2 [Member] - Interest rate swaps - Designated as Hedging Instruments - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other long-term assets, net
Derivatives, Fair Value
Asset Derivatives	$ 0	$ 627
Liability Derivatives	0	0
Other long-term liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	$ (6,932)	$ (751)

DERIVATIVES AND FAIR VALUE ME_5

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 2 - Impact of Derivatives on Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) to be reclassified during next 12 months, forward-starting interest rate swaps	$ (3,100)
Interest rate swaps | Other comprehensive income | Designated as Hedging Instruments | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss) on derivative	(6,808)	$ 17,421
Interest rate swaps | Interest expense, net | Designated as Hedging Instruments | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from AOCI into interest expense, net	$ (1,078)	$ (1,390)

DERIVATIVES AND FAIR VALUE ME_6

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 3 - Estimated Fair Values and Carrying Amounts of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value, long-term debt	$ 3,317,920	$ 3,056,704
Long-term debt	$ 3,277,834	$ 3,111,996

EMPLOYEE BENEFIT PLANS Table -

EMPLOYEE BENEFIT PLANS Table - Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,388	$ 2,406
Interest cost	1,370	1,206
Expected return on assets	(2,004)	(1,855)
Amortization of prior service credit	(514)	(514)
Amortization of net loss	211	544
Net periodic benefit cost (income)	1,451	1,787
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	107	126
Interest cost	114	108
Expected return on assets	0	0
Amortization of prior service credit	(287)	(287)
Amortization of net loss	11	54
Net periodic benefit cost (income)	$ (55)	$ 1

SERIES D CUMULATIVE CONVERTIB_2

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative (Details) - Series D Preferred Limited Partner [Member] - $ / shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019
Preferred Stock, Distributions, Period - June 29, 2018 to June 28, 2020 [Member]
Class of Stock [Line Items]
Preferred units distribution percentage		9.75%
Preferred Stock, Distributions, Period - June 29, 2020 to June 28, 2023 [Member]
Class of Stock [Line Items]
Preferred units distribution percentage		10.75%
Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]
Class of Stock [Line Items]
Preferred units, dividend payment rate, variable		the greater of 13.75% per annum or the distribution per common unit thereafter
Preferred Stock, Distributions, Period - June 29, 2018 to June 15, 2019 [Member]
Class of Stock [Line Items]
Maximum percentage of distributions that may be paid in additional units		50.00%
Preferred Stock Distributions, Period - June 16, 2019 and thereafter [Member]
Class of Stock [Line Items]
Required amount of per unit cash dividends to permit dividend paid in kind		$ 0.635
Subsequent Event [Member]
Class of Stock [Line Items]
Preferred unit distribution	$ 0.619
Distribution payment date	Jun. 17, 2019
Minimum [Member] | Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]
Class of Stock [Line Items]
Preferred units distribution percentage		13.75%

PARTNERS' EQUITY Table 1 - Fina

PARTNERS' EQUITY Table 1 - Financial Information - Preferred Units (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Preferred limited partners' capital, beginning balance	$ 756,301
Net income (loss)	(277,863)	$ 126,133
Other	(813)	(5,113)
Preferred limited partners' capital, ending balance	$ 756,301
Series A Preferred Limited Partner [Member]
Preferred units distribution percentage	8.50%
Preferred limited partners' capital, beginning balance	$ 218,307	218,307
Net income (loss)	4,813	4,813
Distributions to partners	(4,813)	(4,813)
Other		0
Preferred limited partners' capital, ending balance	$ 218,307	218,307
Series B Preferred Limited Partner [Member]
Preferred units distribution percentage	7.625%
Preferred limited partners' capital, beginning balance	$ 371,476	371,634
Net income (loss)	7,339	7,339
Distributions to partners	(7,339)	(7,339)
Other		0
Preferred limited partners' capital, ending balance	$ 371,476	371,634
Series C Preferred Limited Partner [Member]
Preferred units distribution percentage	9.00%
Preferred limited partners' capital, beginning balance	$ 166,518	166,662
Net income (loss)	3,881	3,838
Distributions to partners	(3,881)	(3,838)
Other		(109)
Preferred limited partners' capital, ending balance	166,518	166,553
Preferred Limited Partner [Member]
Preferred limited partners' capital, beginning balance	756,301	756,603
Net income (loss)	16,033	15,990
Distributions to partners	(16,033)	(15,990)
Other	0	(109)
Preferred limited partners' capital, ending balance	$ 756,301	$ 756,494

PARTNERS' EQUITY Table 2 - Cash

PARTNERS' EQUITY Table 2 - Cash Distributions - Preferred Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Series A Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Preferred unit distribution	$ 0.53125
Fixed distribution per quarter	$ 4,813	$ 4,813
Series B Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Preferred unit distribution	$ 0.47657
Fixed distribution per quarter	$ 7,339	7,339
Series C Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Preferred unit distribution	$ 0.56250
Fixed distribution per quarter	$ 3,881	$ 3,838

PARTNERS' EQUITY Narrative 1 (D

PARTNERS' EQUITY Narrative 1 (Details)	3 Months Ended
	Mar. 31, 2019
Class of Stock [Line Items]
Percent of available cash distributed	100.00%
Number of days within which distribution is paid to common unitholders	45

PARTNERS' EQUITY Table 3 - Cash

PARTNERS' EQUITY Table 3 - Cash Distributions Declared - Common Limited Partners (Details) - Common Limited Partner [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Distribution Made to Common Limited Partners [Line Items]
Cash distributions per unit	$ 0.60	$ 0.60
Cash distributions applicable to common unitholders (distribution earned)	$ 64,690	$ 64,336
Distribution date of record (distribution earned)	May 8, 2019	Feb. 8, 2019
Distribution payment date (distribution earned)	May 14, 2019	Feb. 13, 2019

PARTNERS' EQUITY Table 4 - Bala

PARTNERS' EQUITY Table 4 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	$ (54,878)
Balance as of March 31, 2019	(59,704)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	(47,299)
Other comprehensive income (loss) before reclassification adjustments	1,476
Other	0
Other comprehensive income (loss)	1,476
Balance as of March 31, 2019	(45,823)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	(893)
Other comprehensive income (loss) before reclassification adjustments	(6,808)
Other	0
Other comprehensive income (loss)	(5,730)
Balance as of March 31, 2019	(6,623)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	(6,686)
Other comprehensive income (loss) before reclassification adjustments	0
Other	7
Other comprehensive income (loss)	(572)
Balance as of March 31, 2019	(7,258)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	(54,878)
Other comprehensive income (loss) before reclassification adjustments	(5,332)
Other	7
Other comprehensive income (loss)	(4,826)
Balance as of March 31, 2019	(59,704)
Other income, net | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0
Other income, net | Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0
Other income, net | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	(579)
Other income, net | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	(579)
Interest expense, net | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0
Interest expense, net | Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	1,078
Interest expense, net | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0
Interest expense, net | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	$ 1,078

NET (LOSS) INCOME PER COMMON _3

NET (LOSS) INCOME PER COMMON UNIT Narrative (Details) - shares	Mar. 31, 2019	Dec. 31, 2018
Temporary Equity Disclosure [Abstract]
Series D preferred units outstanding	23,246,650	23,246,650

NET (LOSS) INCOME PER COMMON _4

NET (LOSS) INCOME PER COMMON UNIT Table - Net (Loss) Income per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ (277,863)	$ 126,133
Distributions to preferred limited partners	(30,423)	(15,990)
Distributions to general partner	0	(1,141)
Distributions to common limited partners	(64,690)	(55,916)
Distribution equivalent rights to restricted units	(643)	(445)
Distributions (in excess of) less than (loss) income	(373,619)	52,641
Distributions to common limited partners	64,690	55,916
Allocation of distributions (in excess of) less than (loss) earnings	(373,619)	51,148
Series D Preferred Unit accretion	(4,302)	0
Net (loss) income attributable to common units:	$ (313,231)	$ 107,064
Basic weighted-average common units outstanding	107,531,619	93,181,781
Basic net (loss) income per common unit	$ (2.91)	$ 1.15

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, 2019	Mar. 31, 2018
Decrease (increase) in current assets:
Accounts receivable	$ (15,028)	$ 19,525
Receivable from related party	0	133
Inventories	(2,302)	(2,687)
Other current assets	4,191	3,224
Increase (decrease) in current liabilities:
Accounts payable	17,851	(7,681)
Accrued interest payable	(4,948)	3,552
Accrued liabilities	(30,908)	(6,019)
Taxes other than income tax	(2,954)	(1,558)
Income tax payable	695	2,202
Changes in current assets and current liabilities	$ (33,403)	$ 10,691

STATEMENTS OF CASH FLOWS Tabl_2

STATEMENTS OF CASH FLOWS Table 2 - Cash Flows Related to Interest and Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Cash Flows [Abstract]
Cash paid for interest, net of amount capitalized	$ 47,797	$ 42,549
Cash paid for income taxes, net of tax refunds received	$ 1,717	$ 2,635

STATEMENTS OF CASH FLOWS Tabl_3

STATEMENTS OF CASH FLOWS Table 3 - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 15,822	$ 13,644
Cash, cash equivalents and restricted cash	24,534	13,644	$ 15,128	$ 24,292
Prepaid and other current assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 8,712	$ 0

SEGMENT INFORMATION Table 1 - R

SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenues	$ 486,469	$ 475,881
Operating income:
General and administrative expenses	25,996	19,774
Other depreciation and amortization expense	2,119	2,118
Operating income (loss)	(233,099)	98,480
Pipeline Segment
Revenues:
Total revenues	156,251	136,790
Storage Segment
Revenues:
Total revenues	143,011	155,328
Storage Segment | Third Party Revenue [Member]
Revenues:
Total revenues	141,150	153,253
Storage Segment | Intersegment Revenue [Member]
Revenues:
Total revenues	1,861	2,075
Fuels Marketing Segment
Revenues:
Total revenues	189,068	185,838
Operating Segments [Member]
Operating income:
Operating income (loss)	(204,984)	120,372
Operating Segments [Member] | Pipeline Segment
Operating income:
Operating income (loss)	67,304	57,794
Operating Segments [Member] | Storage Segment
Operating income:
Operating income (loss)	(247,240)	56,261
Operating Segments [Member] | Fuels Marketing Segment
Operating income:
Operating income (loss)	(25,016)	6,320
Intersegment Eliminations [Member]
Revenues:
Total revenues	(1,861)	(2,075)
Operating income:
Operating income (loss)	(32)	(3)
Corporate, Non-Segment [Member]
Operating income:
General and administrative expenses	25,996	19,774
Other depreciation and amortization expense	$ 2,119	$ 2,118

SEGMENT INFORMATION Table 2 - A

SEGMENT INFORMATION Table 2 - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Information
Total assets	$ 6,316,899	$ 6,349,140
Other Partnership Assets
Segment Information
Total assets	189,127	174,666
Operating Segments [Member]
Segment Information
Total assets	6,127,772	6,174,474
Operating Segments [Member] | Pipeline Segment
Segment Information
Total assets	3,738,360	3,637,226
Operating Segments [Member] | Storage Segment
Segment Information
Total assets	2,259,552	2,424,342
Operating Segments [Member] | Fuels Marketing Segment
Segment Information
Total assets	$ 129,860	$ 112,906

CONDENSED CONSOLIDATING FINAN_3

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Narrative (Details) - NuStar Energy	3 Months Ended
	Mar. 31, 2019
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 FINAN_4

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 15,822	$ 13,644
Receivables, net	163,739	148,308
Inventories	25,023	22,713
Prepaid and other current assets	21,361	17,493
Intercompany receivable	0	0
Total current assets	225,945	202,158
Property, plant and equipment, net	4,144,265	4,288,622
Intangible assets, net	720,200	733,056
Goodwill	1,005,853	1,036,976
Investment in wholly owned subsidiaries	0	0
Other long-term assets, net	220,636	88,328
Total assets	6,316,899	6,349,140
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	176,871	143,121
Short-term debt and current portion of finance leases	9,335	18,500
Accrued interest payable	31,162	36,293
Accrued liabilities	82,734	101,993
Taxes other than income tax	16,139	19,083
Income tax payable	5,145	4,445
Intercompany payable	0	0
Total current liabilities	321,386	323,435
Long-term debt	3,333,220	3,111,996
Deferred income tax liability	11,787	12,428
Other long-term liabilities	193,536	79,558
Series D preferred units	568,293	563,992
Total partners' equity	1,888,677	2,257,731
Total liabilities, mezzanine equity and partners’ equity	6,316,899	6,349,140
Eliminations [Member]
Assets
Cash and cash equivalents	0	0
Receivables, net	0	0
Inventories	0	0
Prepaid and other current assets	0	0
Intercompany receivable	(1,838,915)	(1,828,416)
Total current assets	(1,838,915)	(1,828,416)
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Goodwill	0	0
Investment in wholly owned subsidiaries	(6,401,363)	(7,388,660)
Other long-term assets, net	0	0
Total assets	(8,240,278)	(9,217,076)
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	0	0
Short-term debt and current portion of finance leases	0	0
Accrued interest payable	0	0
Accrued liabilities	0	0
Taxes other than income tax	0	0
Income tax payable	0	0
Intercompany payable	(1,838,915)	(1,828,416)
Total current liabilities	(1,838,915)	(1,828,416)
Long-term debt	0	0
Deferred income tax liability	0	0
Other long-term liabilities	0	0
Series D preferred units	0	0
Total partners' equity	(6,401,363)	(7,388,660)
Total liabilities, mezzanine equity and partners’ equity	(8,240,278)	(9,217,076)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	1,363	1,255
Receivables, net	0	0
Inventories	0	0
Prepaid and other current assets	98	61
Intercompany receivable	0	0
Total current assets	1,461	1,316
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Goodwill	0	0
Investment in wholly owned subsidiaries	2,983,036	3,355,636
Other long-term assets, net	329	304
Total assets	2,984,826	3,357,256
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	5,996	6,460
Short-term debt and current portion of finance leases	0	0
Accrued interest payable	0	0
Accrued liabilities	895	1,280
Taxes other than income tax	42	125
Income tax payable	0	0
Intercompany payable	461,219	472,790
Total current liabilities	468,152	480,655
Long-term debt	0	0
Deferred income tax liability	0	0
Other long-term liabilities	0	0
Series D preferred units	568,293	563,992
Total partners' equity	1,948,381	2,312,609
Total liabilities, mezzanine equity and partners’ equity	2,984,826	3,357,256
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	1,240	51
Receivables, net	427	2,212
Inventories	1,890	1,741
Prepaid and other current assets	17,932	14,422
Intercompany receivable	1,380,677	1,327,833
Total current assets	1,402,166	1,346,259
Property, plant and equipment, net	1,972,639	1,858,264
Intangible assets, net	46,751	49,107
Goodwill	149,453	149,453
Investment in wholly owned subsidiaries	1,751,576	1,750,256
Other long-term assets, net	113,954	54,429
Total assets	5,436,539	5,207,768
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	52,993	39,680
Short-term debt and current portion of finance leases	9,302	18,500
Accrued interest payable	31,121	36,253
Accrued liabilities	27,683	24,858
Taxes other than income tax	4,967	7,285
Income tax payable	573	457
Intercompany payable	0	0
Total current liabilities	126,639	127,033
Long-term debt	3,281,179	3,050,531
Deferred income tax liability	1,675	1,675
Other long-term liabilities	83,436	28,392
Series D preferred units	0	0
Total partners' equity	1,943,610	2,000,137
Total liabilities, mezzanine equity and partners’ equity	5,436,539	5,207,768
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	0	0
Receivables, net	1,071	0
Inventories	5,563	5,237
Prepaid and other current assets	899	908
Intercompany receivable	0	0
Total current assets	7,533	6,145
Property, plant and equipment, net	608,975	615,549
Intangible assets, net	0	0
Goodwill	170,652	170,652
Investment in wholly owned subsidiaries	1,130,709	1,425,283
Other long-term assets, net	32,779	26,716
Total assets	1,950,648	2,244,345
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	5,258	6,331
Short-term debt and current portion of finance leases	17	0
Accrued interest payable	0	0
Accrued liabilities	8,805	8,082
Taxes other than income tax	6,371	4,718
Income tax payable	2	2
Intercompany payable	1,377,696	1,355,626
Total current liabilities	1,398,149	1,374,759
Long-term debt	66	0
Deferred income tax liability	9	9
Other long-term liabilities	16,534	12,348
Series D preferred units	0	0
Total partners' equity	535,890	857,229
Total liabilities, mezzanine equity and partners’ equity	1,950,648	2,244,345
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	13,219	12,338
Receivables, net	162,241	146,096
Inventories	17,570	15,735
Prepaid and other current assets	2,432	2,102
Intercompany receivable	458,238	500,583
Total current assets	653,700	676,854
Property, plant and equipment, net	1,562,651	1,814,809
Intangible assets, net	673,449	683,949
Goodwill	685,748	716,871
Investment in wholly owned subsidiaries	536,042	857,485
Other long-term assets, net	73,574	6,879
Total assets	4,185,164	4,756,847
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	112,624	90,650
Short-term debt and current portion of finance leases	16	0
Accrued interest payable	41	40
Accrued liabilities	45,351	67,773
Taxes other than income tax	4,759	6,955
Income tax payable	4,570	3,986
Intercompany payable	0	0
Total current liabilities	167,361	169,404
Long-term debt	51,975	61,465
Deferred income tax liability	10,103	10,744
Other long-term liabilities	93,566	38,818
Series D preferred units	0	0
Total partners' equity	3,862,159	4,476,416
Total liabilities, mezzanine equity and partners’ equity	$ 4,185,164	$ 4,756,847

CONDENSED CONSOLIDATING FINAN_5

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 2 - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 486,469	$ 475,881
Costs and expenses	719,568	377,401
Operating (loss) income	(233,099)	98,480
Equity in earnings (loss) of subsidiaries	0	0
Interest income (expense), net	(44,268)	(47,772)
Other income (expense), net	787	79,752
Income (loss) before income tax expense	(276,580)	130,460
Income tax expense (benefit)	1,283	4,327
Net income (loss)	(277,863)	126,133
Comprehensive income (loss)	(282,689)	147,057
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	(187)	(202)
Costs and expenses	(187)	(202)
Operating (loss) income	0	0
Equity in earnings (loss) of subsidiaries	844,178	(368,106)
Interest income (expense), net	0	0
Other income (expense), net	0	0
Income (loss) before income tax expense	844,178	(368,106)
Income tax expense (benefit)	0	0
Net income (loss)	844,178	(368,106)
Comprehensive income (loss)	844,178	(368,106)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Costs and expenses	676	612
Operating (loss) income	(676)	(612)
Equity in earnings (loss) of subsidiaries	(277,295)	126,713
Interest income (expense), net	108	32
Other income (expense), net	0	0
Income (loss) before income tax expense	(277,863)	126,133
Income tax expense (benefit)	0	0
Net income (loss)	(277,863)	126,133
Comprehensive income (loss)	(277,863)	126,133
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	117,555	119,694
Costs and expenses	77,411	72,416
Operating (loss) income	40,144	47,278
Equity in earnings (loss) of subsidiaries	1,339	(2,249)
Interest income (expense), net	(45,456)	(50,026)
Other income (expense), net	754	476
Income (loss) before income tax expense	(3,219)	(4,521)
Income tax expense (benefit)	117	170
Net income (loss)	(3,336)	(4,691)
Comprehensive income (loss)	(9,066)	14,120
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	58,353	56,274
Costs and expenses	36,050	35,181
Operating (loss) income	22,303	21,093
Equity in earnings (loss) of subsidiaries	(294,048)	112,003
Interest income (expense), net	(1,933)	(1,571)
Other income (expense), net	177	115
Income (loss) before income tax expense	(273,501)	131,640
Income tax expense (benefit)	0	1
Net income (loss)	(273,501)	131,639
Comprehensive income (loss)	(273,501)	131,639
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	310,748	300,115
Costs and expenses	605,618	269,394
Operating (loss) income	(294,870)	30,721
Equity in earnings (loss) of subsidiaries	(274,174)	131,639
Interest income (expense), net	3,013	3,793
Other income (expense), net	(144)	79,161
Income (loss) before income tax expense	(566,175)	245,314
Income tax expense (benefit)	1,166	4,156
Net income (loss)	(567,341)	241,158
Comprehensive income (loss)	$ (566,437)	$ 243,271

CONDENSED CONSOLIDATING FINAN_6

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 3 - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net cash provided by operating activities	$ 103,568	$ 123,164
Cash flows from investing activities:
Capital expenditures	(159,429)	(137,874)
Change in accounts payable related to capital expenditures	19,401	(12,018)
Proceeds from sale or disposition of assets	79	19
Proceeds from insurance recoveries	0	78,419
Net cash used in investing activities	(139,949)	(71,454)
Cash flows from financing activities:
Debt borrowings	311,500	349,711
Debt repayments	(158,100)	(274,421)
Distributions to preferred unitholders	(30,423)	(16,680)
Distributions to common unitholders and general partner	(64,367)	(115,272)
Net intercompany activity	0	0
Payment of tax withholding for unit-based compensation	(6,366)	(51)
Other, net	(5,127)	(4,184)
Net cash provided by (used in) financing activities	47,117	(60,846)
Effect of foreign exchange rate changes on cash	154	(28)
Net increase (decrease) in cash, cash equivalents and restricted cash	10,890	(9,164)
Cash, cash equivalents and restricted cash as of the beginning of the period	13,644	24,292
Cash, cash equivalents and restricted cash as of the end of the period	24,534	15,128
Eliminations [Member]
Cash flows from operating activities:
Net cash provided by operating activities	(142,190)	(197,937)
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
Net cash used in investing activities	0	0
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to preferred unitholders	45,635	25,021
Distributions to common unitholders and general partner	96,555	172,916
Net intercompany activity	0	0
Payment of tax withholding for unit-based compensation	0
Other, net	0	0
Net cash provided by (used in) financing activities	142,190	197,937
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash as of the beginning of the period	0	0
Cash, cash equivalents and restricted cash 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	93,209	130,847
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
Net cash used in investing activities	0	0
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to preferred unitholders	(30,423)	(16,680)
Distributions to common unitholders and general partner	(64,367)	(115,272)
Net intercompany activity	8,948	2,053
Payment of tax withholding for unit-based compensation	(6,366)
Other, net	(893)	(975)
Net cash provided by (used in) financing activities	(93,101)	(130,874)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	108	(27)
Cash, cash equivalents and restricted cash as of the beginning of the period	1,255	885
Cash, cash equivalents and restricted cash as of the end of the period	1,363	858
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	26,732	16,855
Cash flows from investing activities:
Capital expenditures	(87,696)	(6,815)
Change in accounts payable related to capital expenditures	14,894	(1,946)
Proceeds from sale or disposition of assets	46	6
Proceeds from insurance recoveries		0
Net cash used in investing activities	(72,756)	(8,755)
Cash flows from financing activities:
Debt borrowings	306,500	348,411
Debt repayments	(143,500)	(268,621)
Distributions to preferred unitholders	(15,212)	(8,341)
Distributions to common unitholders and general partner	(32,183)	(57,636)
Net intercompany activity	(55,453)	(18,769)
Payment of tax withholding for unit-based compensation	0
Other, net	(4,227)	(3,147)
Net cash provided by (used in) financing activities	55,925	(8,103)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	9,901	(3)
Cash, cash equivalents and restricted cash as of the beginning of the period	51	29
Cash, cash equivalents and restricted cash as of the end of the period	9,952	26
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	11,953	25,112
Cash flows from investing activities:
Capital expenditures	(2,253)	(2,440)
Change in accounts payable related to capital expenditures	15,532	(5,700)
Proceeds from sale or disposition of assets	1	4
Proceeds from insurance recoveries		0
Net cash used in investing activities	13,280	(8,136)
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Distributions to preferred unitholders	(15,212)	(8,340)
Distributions to common unitholders and general partner	(32,183)	(57,635)
Net intercompany activity	22,164	48,999
Payment of tax withholding for unit-based compensation	0
Other, net	(2)	0
Net cash provided by (used in) financing activities	(25,233)	(16,976)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash as of the beginning of the period	0	0
Cash, cash equivalents and restricted cash 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	113,864	148,287
Cash flows from investing activities:
Capital expenditures	(69,480)	(128,619)
Change in accounts payable related to capital expenditures	(11,025)	(4,372)
Proceeds from sale or disposition of assets	32	9
Proceeds from insurance recoveries		78,419
Net cash used in investing activities	(80,473)	(54,563)
Cash flows from financing activities:
Debt borrowings	5,000	1,300
Debt repayments	(14,600)	(5,800)
Distributions to preferred unitholders	(15,211)	(8,340)
Distributions to common unitholders and general partner	(32,189)	(57,645)
Net intercompany activity	24,341	(32,283)
Payment of tax withholding for unit-based compensation	0
Other, net	(5)	(62)
Net cash provided by (used in) financing activities	(32,664)	(102,830)
Effect of foreign exchange rate changes on cash	154	(28)
Net increase (decrease) in cash, cash equivalents and restricted cash	881	(9,134)
Cash, cash equivalents and restricted cash as of the beginning of the period	12,338	23,378
Cash, cash equivalents and restricted cash as of the end of the period	$ 13,219	$ 14,244

SUBSEQUENT EVENT (Details)

SUBSEQUENT EVENT (Details)	Apr. 23, 2019shares
Unit-Based Compensation 2019 Plan [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Unit-based compensation, number of units authorized	2,500,000