NuStar Energy (NS) 10-Q 6 Nov 18 2018 Q3 Quarterly report Financial data

DEI Document

DEI Document - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document Information [Abstract]
Entity Registrant Name	NuStar Energy L.P.
Entity Central Index Key	1,110,805
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	ns
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Partnership Units Outstanding		107,045,436

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 24,579	$ 24,292
Accounts receivable, net of allowance for doubtful accounts of $9,499 and $9,948 as of September 30, 2018 and December 31, 2017, respectively	164,768	176,570
Receivable from related party	0	205
Inventories	24,761	26,857
Other current assets	62,766	22,508
Total current assets	276,874	250,432
Property, plant and equipment, at cost	6,601,221	6,243,481
Accumulated depreciation and amortization	(2,116,373)	(1,942,548)
Property, plant and equipment, net	4,484,848	4,300,933
Intangible assets, net	745,912	784,479
Goodwill	1,094,661	1,097,475
Deferred income tax asset	0	233
Other long-term assets, net	118,663	101,681
Total assets	6,720,958	6,535,233
Current liabilities:
Accounts payable	154,212	145,932
Short-term debt	10,500	35,000
Current portion of long-term debt	0	349,990
Accrued interest payable	30,845	40,449
Accrued liabilities	97,298	61,578
Taxes other than income tax	19,695	14,385
Income tax payable	4,576	4,172
Total current liabilities	317,126	651,506
Long-term debt, less current portion	3,376,852	3,263,069
Deferred income tax liability	23,343	22,272
Other long-term liabilities	96,911	118,297
Total liabilities	3,814,232	4,055,144
Commitments and contingencies (Note 6)
Series D preferred limited partners (23,246,650 preferred units outstanding as of September 30, 2018) (Note 11)	559,844	0
Partners’ equity (Note 12):
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 September 30, 2018 and December 31, 2017)	756,303	756,603
Common limited partners (107,043,594 and 93,176,683 common units outstanding as of September 30, 2018 and December 31, 2017, respectively)	1,652,302	1,770,587
General partner	0	37,826
Accumulated other comprehensive loss	(61,723)	(84,927)
Total partners’ equity	2,346,882	2,480,089
Total liabilities, mezzanine equity and partners’ equity	$ 6,720,958	$ 6,535,233

CONSOLIDATED BALANCE SHEETS Non

CONSOLIDATED BALANCE SHEETS Non-Printing - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 9,499	$ 9,948
Series D preferred units outstanding	23,246,650	0
Limited partners common units outstanding (in units)	107,043,594	93,176,683
Series A Preferred Limited Partner [Member]
Preferred units outstanding	9,060,000	9,060,000
Series B Preferred Limited Partner [Member]
Preferred units outstanding	15,400,000	15,400,000
Series C Preferred Limited Partner [Member]
Preferred units outstanding	6,900,000	6,900,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Total revenues	$ 490,363	$ 440,566	$ 1,452,448	$ 1,363,484
Costs and expenses:
Operating expenses (excluding depreciation and amortization expense)	124,451	116,590	365,007	334,016
Depreciation and amortization expense	73,424	66,989	216,934	187,062
General and administrative expenses (excluding depreciation and amortization expense)	27,817	25,003	75,572	83,202
Other depreciation and amortization expense	2,276	2,189	6,645	6,581
Total costs and expenses	395,086	348,849	1,178,853	1,101,224
Operating income	95,277	91,717	273,595	262,260
Interest expense, net	(44,825)	(45,256)	(141,533)	(127,282)
Other income (expense), net	920	(5,126)	82,084	(4,898)
Income before income tax expense	51,372	41,335	214,146	130,080
Income tax expense	3,236	2,743	10,478	7,298
Net income	$ 48,136	$ 38,592	$ 203,668	$ 122,782
Basic net (loss) income per common unit	$ (3.49)	$ 0.15	$ (2.50)	$ 0.65
Basic weighted-average common units outstanding	104,264,796	93,031,320	96,920,202	87,392,597
Comprehensive income	$ 53,037	$ 44,482	$ 226,872	$ 133,566
Service [Member]
Revenues:
Total revenues	314,512	295,102	908,056	845,264
Costs and expenses:
Total costs associated with service revenues	197,875	183,579	581,941	521,078
Product [Member]
Revenues:
Total revenues	175,851	145,464	544,392	518,220
Costs and expenses:
Total costs associated with service revenues	$ 167,118	$ 138,078	$ 514,695	$ 490,363

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ 203,668	$ 122,782
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	223,579	193,643
Unit-based compensation expense	8,689	7,437
Amortization of debt related items	5,926	4,677
(Gain) loss from sale or disposition of assets	(1,264)	4,920
Gain from insurance recoveries	(78,756)	0
Deferred income tax expense (benefit)	1,340	(106)
Changes in current assets and current liabilities (Note 15)	31,243	(17,671)
(Increase) decrease in other long-term assets	(2,324)	1,233
Decrease in other long-term liabilities	(28,171)	(4,752)
Other, net	(610)	(1,148)
Net cash provided by operating activities	363,320	311,015
Cash flows from investing activities:
Capital expenditures	(338,440)	(220,617)
Change in accounts payable related to capital expenditures	(18,630)	13,272
Proceeds from sale or disposition of assets	2,220	2,023
Proceeds from Axeon term loan	0	110,000
Proceeds from insurance recoveries	78,419	0
Acquisitions	(37,502)	(1,461,719)
Investment in other long-term assets	(3,280)	0
Net cash used in investing activities	(317,213)	(1,557,041)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	985,453	1,223,204
Proceeds from short-term debt borrowings	538,500	748,000
Proceeds from note offering, net of issuance costs	0	543,313
Long-term debt repayments	(1,215,498)	(1,204,739)
Short-term debt repayments	(563,000)	(734,000)
Proceeds from issuance of Series D preferred units	590,000	0
Payment of issuance costs for Series D preferred units	(34,187)	0
Proceeds from issuance of other preferred units, net of issuance costs	0	371,802
Proceeds from issuance of common units, net of issuance costs	10,000	643,858
Contributions from general partner	204	13,597
Distributions to preferred unitholders	(60,247)	(26,681)
Distributions to common unitholders and general partner	(236,549)	(331,222)
Cash consideration for Merger (Note 2)	(61,271)	0
Proceeds from termination of interest rate swaps	8,048	0
(Decrease) increase in cash book overdrafts	(27)	1,564
Other, net	(6,527)	(6,634)
Net cash (used in) provided by financing activities	(45,101)	1,242,062
Effect of foreign exchange rate changes on cash	(719)	1,637
Net increase (decrease) in cash and cash equivalents	287	(2,327)
Cash and cash equivalents as of the beginning of the period	24,292	35,942
Cash and cash equivalents as of the end of the period	$ 24,579	$ 33,615

ORGANIZATION AND BASIS OF PRESE

ORGANIZATION AND BASIS OF PRESENTATION	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION AND BASIS OF PRESENTATION	ORGANIZATION AND BASIS OF PRESENTATION Organization and Operations NuStar Energy L.P. (NYSE: NS) is a publicly held Delaware limited partnership engaged in the transportation of petroleum products and anhydrous ammonia, and the terminalling, storage and marketing of petroleum products. Unless otherwise indicated, the terms “NuStar Energy,” “NS,” “the Partnership,” “we,” “our” and “us” are used in this report to refer to NuStar Energy L.P., to one or more of our consolidated subsidiaries or to all of them taken as a whole. As a result of the merger described below, NuStar GP Holdings, LLC (NuStar GP Holdings or NSH), which indirectly owns our general partner, became a wholly owned subsidiary of ours on July 20, 2018 . We conduct our operations through our subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). We have three business segments: pipeline, storage and fuels marketing. Recent Developments Merger. On July 20, 2018, we completed the merger of NSH with a subsidiary of NS. 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. See Note 2 for further discussion of the merger. Issuance of units. On June 29, 2018, we issued 15,760,441 Series D Cumulative Convertible Preferred Units (Series D Preferred Units) at a price of $25.38 per unit in a private placement for net proceeds of $370.7 million . On July 13, 2018, we issued an additional 7,486,209 Series D Preferred Units at a price of $25.38 per unit in a private placement for net proceeds of $185.1 million . See Note 11 for further discussion. On June 29, 2018, we issued 413,736 common units at a price of $24.17 per unit to William E. Greehey, Chairman of the Board of Directors of NuStar GP, LLC. Hurricane Activity. In the third quarter of 2017, several of our facilities were affected by the hurricanes in the Caribbean and Gulf of Mexico, including our St. Eustatius terminal, which experienced the most damage and was temporarily shut down. The damage caused by the Caribbean hurricane resulted in lower revenues for our bunker fuel operations in our fuels marketing segment and lower throughput and associated handling fees in our storage segment in 2017 and in the first quarter of 2018. In January 2018, we received $87.5 million of insurance proceeds in settlement of our property damage claim for our St. Eustatius terminal, of which $9.1 million related to business interruption. Proceeds from business interruption insurance are included in “Operating expenses” in the consolidated statements of income and in “Cash flows from operating activities” in the consolidated statements of cash flows. We recorded a $78.8 million gain in “Other income, net” in the consolidated statements of income in the first quarter of 2018 for the amount by which the insurance proceeds exceeded our expenses incurred during the period. We expect that the costs to repair the property damage at the terminal will not exceed the amount of insurance proceeds received. Basis of Presentation These unaudited condensed consolidated financial statements include the accounts of the Partnership and subsidiaries in which the Partnership has a controlling interest. Inter-partnership balances and transactions have been eliminated in consolidation. These unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, they do not include all of the information and notes required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included, and all disclosures are adequate. All such adjustments are of a normal recurring nature unless disclosed otherwise. Financial information for the three and nine months ended September 30, 2018 and 2017 included in these Condensed Notes to Consolidated Financial Statements is derived from our unaudited condensed consolidated financial statements. Operating results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . The consolidated balance sheet as of December 31, 2017 has been derived from the audited consolidated financial statements as of that date. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2017 . Certain previously reported amounts in the 2017 consolidated financial statements have been reclassified to conform to the 2018 presentation.

MERGER

MERGER	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
MERGER	MERGER On February 7, 2018, NuStar Energy, Riverwalk Logistics, L.P., NuStar GP, LLC, Marshall Merger Sub LLC, a wholly owned subsidiary of NuStar Energy (Merger Sub), Riverwalk Holdings, LLC and NuStar GP Holdings entered into an Agreement and Plan of Merger (the Merger Agreement). Pursuant to the Merger Agreement, Merger Sub merged with and into NuStar GP Holdings with NuStar GP Holdings being the surviving entity (the Merger), such that NuStar Energy became the sole member of NuStar GP Holdings following the Merger on July 20, 2018 (refer to the next two pages for charts depicting our organizational structure before and after the Merger). Pursuant to the Merger Agreement and at the effective time of the Merger, NuStar Energy’s partnership agreement was amended and restated to, among other things, (i) cancel the incentive distribution rights held by our general partner, (ii) convert the 2% general partner interest in NuStar Energy held by our general partner into a non-economic management interest and (iii) provide the holders of our common units with voting rights in the election of the members of the board of directors of NuStar GP, LLC, beginning at the annual meeting in 2019. At the effective time of the Merger, each outstanding NuStar GP Holdings common unit was converted into the right to receive 0.55 of a NuStar Energy common unit and all NuStar GP Holdings common units ceased to be outstanding. No fractional NuStar Energy common units were issued in the Merger; instead, each holder of NuStar GP Holdings’ common units otherwise entitled to receive a fractional NuStar Energy common unit received cash in lieu thereof. As a result of the Merger, we issued approximately 23.6 million NuStar Energy common units and cancelled the 10.2 million NuStar Energy common units owned by subsidiaries of NuStar GP Holdings, resulting in approximately 13.4 million incremental NuStar Energy common units outstanding after the Merger. Also at the effective time of the Merger, each outstanding award of NuStar GP Holdings restricted units was converted, on the same terms and conditions as were applicable to the awards immediately prior to the Merger, into an award of NuStar Energy restricted units. The number of NuStar Energy restricted units subject to the converted awards was determined pursuant to the 0.55 exchange ratio provided in the Merger Agreement. Following the completion of the Merger, the NuStar GP, LLC board of directors consists of nine members, currently composed of the six members of the NuStar GP, LLC board of directors prior to the Merger and the three independent directors who served prior to the Merger on NuStar GP Holdings’ board of directors. We accounted for the Merger as an equity transaction similar to a redemption or induced conversion of preferred stock. The excess of (1) the fair value of the consideration transferred in exchange for the outstanding NSH units over (2) the carrying value of the general partner interest in the Partnership was subtracted from net income available to common unitholders in the calculation of net loss per common unit attributable to the Merger as follows (in thousands of dollars, except unit and per unit data): Consideration transferred: Fair value of incremental NS common units issued $ 335,106 NSH debt and net current liabilities assumed 52,075 Transaction costs, including accrued costs 15,897 Total consideration 403,078 Carrying value of general partner interest 25,999 Loss to common unitholders attributable to the Merger $ (377,079 ) For the three months ended September 30, 2018: Basic weighted-average common units outstanding 104,264,796 Loss per common unit attributable to the Merger $ (3.62 ) The following chart depicts a summary of our organizational structure as of June 30, 2018, before the Merger: The following chart depicts a summary of our organizational structure as of September 30, 2018, after the Merger:

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS	9 Months Ended
	Sep. 30, 2018
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 is effective on November 5, 2018, with an exception for the new disclosure requirement to present changes in partners’ equity in interim periods, which will permit 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 will begin 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. Unit-Based Payments to Nonemployees In June 2018, the FASB issued amended guidance which aligns the measurement and classification guidance for unit-based payments to nonemployees with the guidance for unit-based payments to employees, with certain exceptions. Under the amended guidance, unit-based payment awards to nonemployees will be measured at their grant date fair value. The guidance is effective for annual and interim periods beginning after December 15, 2018, with early adoption permitted. The amended guidance should be applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. We 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. Comprehensive Income In February 2018, the FASB issued amended guidance which provides an entity the option to reclassify stranded tax effects caused by the Tax Cuts and Jobs Act of 2017 from accumulated other comprehensive income to retained earnings, and also requires certain additional disclosures about those stranded tax effects. The guidance is effective for annual and interim periods beginning after December 15, 2018, with early adoption permitted. The new requirements should be applied using one of two retrospective transition methods. We are currently evaluating whether we will adopt these provisions early, but we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures. Derivatives and Hedging In August 2017, the FASB issued amended guidance intended to improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. The amended guidance also makes certain targeted improvements to simplify the application of current hedge accounting guidance. The guidance is effective for annual and interim periods beginning after December 15, 2018, with early adoption permitted. Certain of the new requirements should be applied prospectively, while others should be applied using a modified retrospective transition method. We currently expect to adopt the amended guidance on January 1, 2019. We do not expect the guidance to have a material impact on our financial position or results of operations, and we are assessing the impact on our disclosures. Defined Benefit Plans In March 2017, the FASB issued amended guidance that changes the presentation of net periodic pension cost related to defined benefit plans. Under the amended guidance, the service cost component of net periodic benefit cost will be presented in the same income statement line items as other current employee compensation costs, but the remaining components of net periodic benefit cost will be presented outside of operating income. The changes are effective for annual and interim periods beginning after December 15, 2017, and amendments should be applied retrospectively. We began reporting the remaining components of net periodic benefit cost in “Other income, net” in the consolidated statements of comprehensive income upon adoption of the amended guidance on January 1, 2018. We applied the amended guidance prospectively as it did not have a material impact on previous periods. Goodwill In January 2017, the FASB issued amended guidance that simplifies the accounting for goodwill impairment by eliminating step 2 of the goodwill impairment test. Under the amended guidance, goodwill impairment will be measured as the excess of the reporting unit’s carrying value over its fair value, not to exceed the carrying amount of goodwill for that reporting unit. The changes are effective for annual and interim periods beginning after December 15, 2019, and amendments should be applied prospectively. Early adoption is permitted for any impairment tests performed after January 1, 2017, and we are currently evaluating whether we will adopt these provisions early. Regardless of our decision, we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures. Credit Losses In June 2016, the FASB issued amended guidance that requires the use of a “current expected loss” model for financial assets measured at amortized cost and certain off-balance sheet credit exposures. Under this model, entities will be required to estimate the lifetime expected credit losses on such instruments based on historical experience, current conditions, and reasonable and supportable forecasts. This amended guidance also expands the disclosure requirements to enable users of financial statements to understand an entity’s assumptions, models and methods for estimating expected credit losses. The changes are effective for annual and interim periods beginning after December 15, 2019, and amendments should be applied using a modified retrospective approach. We currently expect to adopt the amended guidance on January 1, 2020, and 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, with the option to use certain practical expedients including those for land easements. We currently expect to adopt these provisions on January 1, 2019 through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We have identified our lease arrangements, continue the process of system implementation, and have begun to evaluate internal processes and controls. We do not expect the amended guidance to have a material impact on our financial position or results of operations; however, we are continuing to evaluate the impact of the amended guidance. We intend to provide additional disclosures as required by the new standard, which we are currently assessing, in our quarterly report on Form 10-Q for the first quarter of 2019. Revenue Recognition In May 2014, the FASB and the International Accounting Standards Board jointly issued a comprehensive new revenue recognition standard that requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. The standard is effective for public entities for annual and interim periods beginning after December 15, 2017, using one of two retrospective transition methods. We adopted these provisions January 1, 2018 using the modified retrospective approach. The transition adjustment related to the adoption was immaterial, and we do not expect the adoption of this standard to materially impact the amount or timing of our revenue going forward. Please refer to Note 13 for further discussion.

ACQUISITIONS

ACQUISITIONS	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS Council Bluffs Acquisition On April 16, 2018, we acquired CHS Inc.’s Council Bluffs pipeline system, comprised of a 227-mile pipeline and 18 storage tanks, for approximately $37.5 million (the Council Bluffs Acquisition). The assets acquired and the results of operations are included in our pipeline segment from the date of acquisition. We accounted for this acquisition as an asset purchase. Navigator Acquisition On April 11, 2017, we entered into a Membership Interest Purchase and Sale Agreement (the Acquisition Agreement) with FR Navigator Holdings LLC to acquire (the Navigator Acquisition) all of the issued and outstanding limited liability company interests in Navigator Energy Services, LLC (Navigator) for approximately $1.5 billion . We closed the Navigator Acquisition on May 4, 2017 . We acquired crude oil transportation, pipeline gathering and storage assets located in the Midland Basin in West Texas that, along with the assets we have built since the date of the Navigator Acquisition, we collectively refer to as our Permian Crude System. The assets acquired are included in our pipeline segment. The condensed consolidated statements of comprehensive income include the results of operations for Navigator commencing on May 4, 2017. We accounted for the Navigator Acquisition using the acquisition method. The following table reflects the final purchase price allocation: Purchase Price Allocation (Thousands of Dollars) Accounts receivable $ 4,747 Other current assets 2,359 Property, plant and equipment, net 376,690 Intangible assets (a) 700,000 Goodwill (b) 398,024 Other long-term assets, net 2,199 Current liabilities (22,300 ) Purchase price allocation, net of cash acquired $ 1,461,719 (a) Intangible assets, which consist of customer contracts and relationships, are amortized on a straight-line basis over a period of 20 years . (b) The goodwill acquired represents the expected benefit from entering new geographic areas and the anticipated opportunities to generate future cash flows from the assets acquired and potential future projects. The unaudited pro forma information for the nine months ended September 30, 2017 below presents the combined historical financial information for Navigator and the Partnership for those periods. This information assumes: • we completed the Navigator Acquisition on January 1, 2017; • we issued approximately 14.4 million common units; • we received a contribution from our general partner of $13.6 million to maintain the 2% general partner economic interest it owned at that time; • we issued 15.4 million Series B Preferred Units; • we issued $550.0 million of 5.625% senior notes; • additional depreciation and amortization that would have been incurred assuming the fair value adjustments to property, plant and equipment and intangible assets reflected in the purchase price allocation above; and • we satisfied Navigator’s outstanding obligations under its revolving credit agreement. Nine Months Ended September 30, 2017 (Thousands of Dollars, Except Per Unit Data) Revenues $ 1,377,883 Net income $ 102,251 Basic net income per common unit $ 0.31 The pro forma information for the nine months ended September 30, 2017 includes transaction costs of approximately $14.0 million , which were directly attributable to the Navigator Acquisition and paid in the second quarter of 2017. The pro forma information is unaudited and is not necessarily indicative of the results of operations that would have resulted had the Navigator Acquisition occurred on January 1, 2017 or that may result in the future.

DEBT

DEBT	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
DEBT	DEBT Revolving Credit Agreement On June 29, 2018, NuStar Logistics amended its revolving credit agreement (the Revolving Credit Agreement) to exclude the Series D Preferred Units from the definition of “Indebtedness.” Additionally, the amendment reduced the total amount available for borrowing from $1.75 billion to $1.575 billion , effective June 29, 2018, with a further reduction to $1.4 billion , effective December 28, 2018. The Revolving Credit Agreement was also amended to, among other things, add a minimum consolidated interest coverage ratio (as defined in the Revolving Credit Agreement), which must not be less than 1.75-to-1.00 for each rolling period of four quarters, beginning with the rolling period ending June 30, 2018. On March 28, 2018, NuStar Logistics amended the Revolving Credit Agreement to increase the maximum allowed consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) to 5.25-to-1.00 for the rolling periods ending June 30, 2018 through December 31, 2018. For any rolling periods ending on or after March 31, 2019, the maximum allowed consolidated debt coverage ratio may not exceed 5.00-to-1.00. The Revolving Credit Agreement was also amended to, among other things, provide that the definition of “Change in Control” in the Revolving Credit Agreement excludes the Merger discussed in Note 2 . 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 September 30, 2018 , we had $563.9 million available for borrowing, and we believe that we are in compliance with the covenants in 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 February 2018, Moody’s Investor Service Inc. (Moody’s) lowered our credit rating from Ba1 to Ba2. This rating downgrade caused the interest rate on our Revolving Credit Agreement to increase by 0.25% effective February 2018. As of September 30, 2018 , our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 4.0% , and we had $1.0 billion outstanding. NuStar Logistics Senior Notes The credit rating downgrade by Moody’s in February 2018 increased the interest rate on our $350.0 million of 7.65% senior notes by 0.25% , resulting in an interest rate of 8.65% applicable to the interest payment due April 15, 2018. We repaid these notes on April 15, 2018 with borrowings under our Revolving Credit Agreement. NuStar Logistics Subordinated Notes Effective January 15, 2018, the interest rate on NuStar Logistics’ $402.5 million of fixed-to-floating rate subordinated notes due January 15, 2043 switched from a fixed annual rate of 7.625% , payable quarterly in arrears, to an annual rate equal to the sum of the three-month LIBOR for the related quarterly interest period, plus 6.734% payable quarterly, commencing with the interest payment due April 15, 2018. As of September 30, 2018 , the interest rate was 9.1% . Receivables Financing Agreement NuStar Energy and NuStar Finance LLC (NuStar Finance), a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $125.0 million receivables financing agreement with third-party lenders (the Receivables Financing Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (collectively with the Receivables Financing Agreement, the Securitization Program). NuStar Finance’s sole activity consists of purchasing receivables from NuStar Energy’s wholly owned subsidiaries that participate in the Securitization Program and providing these receivables as collateral for NuStar Finance’s revolving borrowings under the Securitization Program. NuStar Finance is a separate legal entity and the assets of NuStar Finance, including these accounts receivable, are not available to satisfy the claims of creditors of NuStar Energy, its subsidiaries selling receivables under the Securitization Program or their affiliates. The amount available for borrowing is based on the availability of eligible receivables and other customary factors and conditions. The March 28, 2018 amendment to the Revolving Credit Agreement also limits the amount of borrowings under the Receivables Financing Agreement to $125.0 million . Borrowings by NuStar Finance under the Receivables Financing Agreement bear interest at the applicable bank rate, as defined under the Receivables Financing Agreement. The weighted average interest rate related to outstanding borrowings under the Securitization Program as of September 30, 2018 was 3.1% . As of September 30, 2018 , $104.9 million of our accounts receivable, net of allowance for doubtful accounts, are included in the Securitization Program. The amount of borrowings outstanding under the Receivables Financing Agreement totaled $63.7 million as of September 30, 2018 , which is included in “Long-term debt” on the consolidated balance sheet. On March 28, 2018, the Receivables Financing Agreement was amended to change the definition of Change in Control in the Receivables Financing Agreement such that the Merger discussed in Note 2 would not be a Change in Control for purposes of the Receivables Financing Agreement.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES We have contingent liabilities resulting from various litigation, claims and commitments. We record accruals for loss contingencies when losses are considered probable and can be reasonably estimated. Legal fees associated with defending the Partnership in legal matters are expensed as incurred. We accrued $2.9 million for contingent losses as of September 30, 2018 and $7.3 million as of December 31, 2017 . The amount that will ultimately be paid related to such matters may differ from the recorded accruals, and the timing of such payments is uncertain. We evaluate each contingent loss at least quarterly, and more frequently as each matter progresses and develops over time, and we do not believe that the resolution of any particular claim or proceeding, or all matters in the aggregate, would have a material adverse effect on our results of operations, financial position or liquidity.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS We segregate the inputs used in measuring fair value into three levels: Level 1, defined as observable inputs, such as quoted prices for identical assets or liabilities in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets that are not active; and Level 3, defined as unobservable inputs for which little or no market data exists. We consider counterparty credit risk and our own credit risk in the determination of all estimated fair values. Recurring Fair Value Measurements The following assets and liabilities are measured at fair value on a recurring basis: September 30, 2018 Level 1 Level 2 Level 3 Total (Thousands of Dollars) Assets: Other long-term assets, net: Interest rate swaps $ — $ 8,031 $ — $ 8,031 Liabilities: Accrued liabilities: Commodity derivatives $ (276 ) $ — $ — $ (276 ) December 31, 2017 Level 1 Level 2 Level 3 Total (Thousands of Dollars) Assets: Other current assets: Product imbalances $ 3,890 $ — $ — $ 3,890 Liabilities: Accrued liabilities: Product imbalances $ (1,534 ) $ — $ — $ (1,534 ) Commodity derivatives (878 ) — — (878 ) Interest rate swaps — (5,394 ) — (5,394 ) Other long-term liabilities: Interest rate swaps — (4,594 ) — (4,594 ) Total liabilities $ (2,412 ) $ (9,988 ) $ — $ (12,400 ) Product Imbalances. Pursuant to the new revenue recognition standard we adopted January 1, 2018, we no longer recognize the fair value of product imbalances on our consolidated balance sheets. Prior to adoption, we valued our assets and liabilities related to product imbalances using quoted market prices in active markets as of the reporting date; accordingly, we included these product imbalances in Level 1 of the fair value hierarchy. Commodity Derivatives. We base the fair value of certain of our commodity derivative instruments on quoted prices on an exchange; accordingly, we include these items in Level 1 of the fair value hierarchy. See Note 8 for a discussion of our derivative instruments. Interest Rate Swaps. Because we estimate the fair value of our forward-starting interest rate swaps using discounted cash flows, which use observable inputs such as time to maturity and market interest rates, we include these interest rate swaps in Level 2 of the fair value hierarchy. Fair Value of Financial Instruments We recognize cash equivalents, receivables, payables and debt in our consolidated balance sheets at their carrying amounts. The fair values of these financial instruments, except for long-term debt, approximate their carrying amounts. The estimated fair values and carrying amounts of long-term debt, including the current portion, were as follows: September 30, 2018 December 31, 2017 (Thousands of Dollars) Fair value $ 3,409,199 $ 3,677,622 Carrying amount $ 3,376,852 $ 3,613,059 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.

DERIVATIVES AND RISK MANAGEMENT

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES AND RISK MANAGEMENT ACTIVITIES	DERIVATIVES AND RISK MANAGEMENT ACTIVITIES We utilize various derivative instruments to manage our exposure to interest rate risk and commodity price risk. Our risk management policies and procedures are designed to monitor interest rates, futures and swap positions and over-the-counter positions, as well as physical commodity volumes, grades, locations and delivery schedules, to help ensure that our hedging activities address our market risks. Interest Rate Risk We are a party to certain interest rate swap agreements to manage our exposure to changes in interest rates, which include forward-starting interest rate swap agreements related to 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 September 30, 2018 and December 31, 2017 , the aggregate notional amount of forward-starting interest rate swaps totaled $250.0 million and $600.0 million , respectively. In April 2018, in connection with the maturity of the 7.65% senior notes due April 15, 2018, we terminated forward-starting interest rate swaps with an aggregate notional amount of $350.0 million and received $8.0 million . The termination payments are included in cash flows from financing activities on the consolidated statements of cash flows. During the third quarter of 2018, we determined that one forecasted interest payment was probable not to occur, and we reclassified $0.3 million from AOCI to “Interest expense, net.” Commodity Price Risk We are exposed to market risks related to the volatility of petroleum product prices. In order to reduce the risk of commodity price fluctuations with respect to our petroleum product inventories and related firm commitments to purchase and/or sell such inventories, we utilize commodity futures and swap contracts, which qualify, and we designate, as fair value hedges. Derivatives that are intended to hedge our commodity price risk but fail to qualify as fair value hedges are considered economic hedges, and we record associated gains and losses in net income. Our risk management committee oversees our trading controls and procedures and certain aspects of commodity and trading risk management. Our risk management committee also reviews all new commodity and trading risk management strategies in accordance with our risk management policy, as approved by our board of directors. We ceased marketing crude oil in the second quarter of 2017 and exited our heavy fuels trading operations in the third quarter of 2017, thereby reducing our overall hedging activity. The volume of commodity contracts is based on open derivative positions and represents the combined volume of our long and short open positions on an absolute basis, which totaled 0.2 million and 1.2 million barrels as of September 30, 2018 and December 31, 2017 , respectively. We had $0.4 million and $0.3 million of margin deposits as of September 30, 2018 and December 31, 2017 , respectively. The fair values of our derivative instruments included in our consolidated balance sheets were as follows: Asset Derivatives Liability Derivatives Balance Sheet Location September 30, December 31, September 30, December 31, (Thousands of Dollars) Derivatives Designated as Hedging Instruments: Interest rate swaps Other long-term assets, net $ 8,031 $ — $ — $ — Commodity contracts Accrued liabilities 28 — (296 ) (112 ) Interest rate swaps Accrued liabilities — — — (5,394 ) Interest rate swaps Other long-term liabilities — — — (4,594 ) Total 8,059 — (296 ) (10,100 ) Derivatives Not Designated as Hedging Instruments: Commodity contracts Accrued liabilities 5 742 (13 ) (1,508 ) Total Derivatives $ 8,064 $ 742 $ (309 ) $ (11,608 ) Certain of our derivative instruments are eligible for offset in the consolidated balance sheets and subject to master netting arrangements. Under our master netting arrangements, there is a legally enforceable right to offset amounts, and we intend to settle such amounts on a net basis. The following are the net amounts presented on the consolidated balance sheets: Commodity Contracts September 30, December 31, (Thousands of Dollars) Net amounts of liabilities presented in the consolidated balance sheets $ (276 ) $ (878 ) We recognize the impact of our commodity contracts on earnings in “Cost of product sales” on the condensed consolidated statements of comprehensive income, as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars) Derivatives Designated as Fair Value Hedging Instruments: (Loss) gain recognized in income on derivative $ (294 ) $ (1,134 ) $ (1,597 ) $ 1,327 (Loss) gain recognized in income on hedged item (221 ) 1,111 997 (1,036 ) (Loss) gain recognized in income for ineffective portion $ (515 ) $ (23 ) $ (600 ) $ 291 Derivatives Not Designated as Hedging Instruments: Loss recognized in income on derivative $ (209 ) $ (132 ) $ (439 ) $ (218 ) Our interest rate swaps had the following impact on earnings: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars) Derivatives Designated as Cash Flow Hedging Instruments: Gain (loss) recognized in other comprehensive income on derivative (effective portion) $ 3,540 $ (2,064 ) $ 26,067 $ (10,005 ) Loss reclassified from AOCI into interest expense, net (effective portion) $ (1,719 ) $ (1,584 ) $ (4,271 ) $ (5,112 ) As of September 30, 2018 , we expect to reclassify a loss of $4.0 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS Please refer to Note 2 for a discussion of the Merger. Prior to the Merger, we were a party to the Amended and Restated Services Agreement with NuStar GP, LLC, effective March 1, 2016 (the Amended GP Services Agreement), which provided that we furnish administrative services necessary to conduct the business of NuStar GP Holdings, and NuStar GP Holdings compensated us for these services for an annual fee of $1.0 million, subject to adjustment. We terminated the Amended GP Services Agreement in conjunction with the Merger.

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	9 Months Ended
	Sep. 30, 2018
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. In September 2018, we contributed $11.0 million to the Pension Plans. We also sponsor a contributory medical benefits plan for U.S. employees who retired prior to April 1, 2014. For employees who retire on or after April 1, 2014, we provide partial reimbursement for eligible third-party health care premiums. The components of net periodic benefit cost (income) related to our Pension Plans and other postretirement benefit plans were as follows: Pension Plans Other Postretirement Benefit Plans 2018 2017 2018 2017 (Thousands of Dollars) For the three months ended September 30: Service cost $ 2,405 $ 2,239 $ 126 $ 115 Interest cost 1,206 1,127 107 107 Expected return on assets (1,854 ) (1,603 ) — — Amortization of prior service credit (515 ) (515 ) (286 ) (286 ) Amortization of net loss 544 371 53 47 Net periodic benefit cost (income) $ 1,786 $ 1,619 $ — $ (17 ) For the nine months ended September 30: Service cost $ 7,216 $ 6,717 $ 378 $ 341 Interest cost 3,618 3,381 322 323 Expected return on assets (5,563 ) (4,808 ) — — Amortization of prior service credit (1,543 ) (1,546 ) (859 ) (858 ) Amortization of net loss 1,631 1,113 160 143 Net periodic benefit cost (income) $ 5,359 $ 4,857 $ 1 $ (51 )

SERIES D CUMULATIVE CONVERTIBLE

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS	9 Months Ended
	Sep. 30, 2018
Temporary Equity Disclosure [Abstract]
SERIES D CUMULATIVE COVERTIBLE PREFERRED UNITS	SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Purchase Agreement and Issuance of Series D Preferred Units On June 26, 2018, the Partnership entered into a purchase agreement (the Series D Preferred Unit Purchase Agreement) with investment funds, accounts and entities (collectively, the Purchasers) managed by EIG Management Company, LLC and FS/EIG Advisors, LLC to issue and sell $590.0 million of Series D Preferred Units in a private placement. The Partnership issued a total of 23,246,650 Series D Preferred Units to the Purchasers at a price of $25.38 per Series D Preferred Unit (the Series D Preferred Unit Purchase Price). At the initial closing on June 29, 2018 (the Initial Closing), the Purchasers purchased 15,760,441 Series D Preferred Units for $400.0 million , and we received net proceeds of $370.7 million . The Purchasers purchased the remaining 7,486,209 Series D Preferred Units for $190.0 million at a second closing on July 13, 2018. The aggregate net proceeds to the Partnership from the sale of the Series D Preferred Units of $555.8 million , including deductions for a 3.5% transaction fee of $20.7 million paid to the Purchasers and other issuance costs of $13.5 million , were used for general partnership purposes, including repayment of outstanding borrowings under our Revolving Credit Agreement. Series D Preferred Units Rights At the Initial Closing and pursuant to the Series D Preferred Unit Purchase Agreement, the Partnership amended and restated its partnership agreement to authorize and establish the rights, preferences and privileges of the Series D Preferred Units. The Series D Preferred Units rank equal to other classes of preferred units and senior to common units in the Partnership with respect to distribution rights and rights upon liquidation. The Series D Preferred Units generally will vote on an as-converted basis with the common units and will have certain class voting rights with respect to a limited number of matters as set forth in the partnership agreement. Series D Preferred Units Distributions 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 common unit distribution rate 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. If we fail to pay in full any Series D Preferred Unit distribution amount, then, until we pay such distributions in full, the applicable distribution rate for each of those distribution periods shall be increased by $0.048 per Series D Preferred Unit. In addition, if we fail to pay in full any Series D Preferred Unit distribution amount for three consecutive distribution periods, then until we pay such distributions in full: (i) each holder of the Series D Preferred Units may elect to convert its Series D Preferred Units into common units on a one-for-one basis, plus any unpaid Series D distributions , (ii) one person selected by the holders holding a majority of the outstanding Series D Preferred Units shall become an additional member of our board of directors and (iii) we will not be permitted to incur any indebtedness (as defined in the Revolving Credit Agreement) or engage in any acquisitions or asset sales in excess of $50.0 million without the consent of the holders holding a majority of the outstanding Series D Preferred Units. In addition, we will permanently lose the ability to pay any part of the distributions on the Series D Preferred Units in the form of additional Series D Preferred Units. In October 2018, our board of directors declared a distribution of $0.619 per Series D Preferred Unit to be paid on December 17, 2018 to holders of record as of December 3, 2018 . In July 2018, our board of directors declared an initial distribution of $0.525 per Series D Preferred Unit issued on June 29, 2018 and an initial distribution of $0.431 per Series D Preferred Unit issued on July 13, 2018 , which were both paid on September 17, 2018 to holders of record as of September 4, 2018 . Series D Preferred Units Conversion and Redemption Features At any time on or after June 29, 2020, each holder of Series D Preferred Units may convert all or any portion of its Series D Preferred Units into common units on a one-for-one basis (plus any unpaid Series D distributions), subject to anti-dilution adjustments, at any time, but not more than once per quarter, so long as any conversion is for at least $50.0 million based on the Series D Preferred Unit Purchase Price (or such lesser amount representing all of a holder’s Series D Preferred Units). The Partnership may redeem all or any portion of the Series D Preferred Units, in an amount not less than $50.0 million for cash at a redemption price equal to, as applicable: (i) $31.73 per Series D Preferred Unit at any time on or after June 29, 2023 but prior to June 29, 2024; (ii) $30.46 per Series D Preferred Unit at any time on or after June 29, 2024 but prior to June 29, 2025; (iii) $29.19 per Series D Preferred Unit at any time on or after June 29, 2025; plus, in each case, the sum of any unpaid distributions on the applicable Series D Preferred Unit plus the distributions prorated for the number of days elapsed (not to exceed 90 ) in the period of redemption (Series D Partial Period Distributions). The holders have the option to convert the units prior to such redemption as discussed above. Additionally, at any time on or after June 29, 2028, each holder of Series D Preferred Units will have the right to require the Partnership to redeem all of the Series D Preferred Units held by such holder at a redemption price equal to $29.19 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions . If a holder of Series D Preferred Units exercises its redemption right, the Partnership may elect to pay up to 50% of such amount in common units (which shall be valued at 93% of a volume-weighted average trading price of the common units); provided, that the common units to be issued do not, in the aggregate, exceed 15% of NuStar Energy’s common equity market capitalization at the time. Series D Preferred Units Change of Control Upon certain events involving a change of control, each holder of the Series D Preferred Units may elect to: (i) convert its Series D Preferred Units into common units on a one-for-one basis, plus any unpaid Series D distributions ; (ii) require the Partnership to redeem its Series D Preferred Units for an amount equal to the sum of (a) $29.82 per Series D Preferred Unit plus (b) any unpaid Series D distributions plus (c) the applicable distribution amount for the distribution periods ending after the change of control event and prior to (but including) the fourth anniversary of the Initial Closing ; (iii) if the Partnership is the surviving entity and its common units continue to be listed, continue to hold its Series D Preferred Units; or (iv) if the Partnership will not be the surviving entity, or it will be the surviving entity but its common units will cease to be listed, require the Partnership to use its commercially reasonable efforts to deliver a security in the surviving entity that has substantially similar terms as the Series D Preferred Units; however, if the Partnership is unable to deliver a mirror security, each holder is still entitled to option (i) or (ii) above. Registration Rights Agreement On June 29, 2018, in connection with the Initial Closing and pursuant to the Series D Preferred Unit Purchase Agreement, the Partnership entered into a Registration Rights Agreement (the Registration Rights Agreement) with the Purchasers relating to the registration of the Series D Preferred Units and common units issuable upon conversion of the Series D Preferred Units (the Common Unit Registrable Securities, and, collectively with the Series D Preferred Units, the Registrable Securities). Pursuant to the Registration Rights Agreement, the Partnership is required to use its commercially reasonable efforts to file a registration statement and to cause such registration statement to become effective: (i) with respect to the Common Unit Registrable Securities, no later than one year after the Initial Closing; and (ii) with respect to the Series D Preferred Units, after the second anniversary of the Initial Closing, no later than one year after receipt by the Partnership of a written request from holders holding a majority of the Series D Preferred Units to register the Series D Preferred Units. If the Partnership fails to cause such registration statements to become effective by such dates, the Partnership will be required to pay certain amounts to the holders of the Registrable Securities as liquidated damages. Series D Preferred Units Accounting Treatment The Series D Preferred Units include redemption provisions at the option of the holders of the Series D Preferred Units and upon a Series D Change of Control (as defined in the partnership agreement), which are outside the Partnership’s control. Therefore, the Series D Preferred Units are presented in the mezzanine section of the consolidated balance sheets. The Series D Preferred Units have been recorded at their issuance date fair value, net of issuance costs. We reassess the presentation of the Series D Preferred Units in our consolidated balance sheets on a quarterly basis. The Series D Preferred Units are subject to accretion from their carrying value at the issuance date to the redemption value, which is based on the redemption right of the Series D Preferred Unit holders that may be exercised at any time on or after June 29, 2028 , using the effective interest method over a period of ten years. In the calculation of net income per unit, the accretion will be treated in the same manner as a distribution and deducted from net income to arrive at net income attributable to common units. Series D Preferred Units Activity The following table summarizes changes to our mezzanine equity: Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 (Thousands of Dollars) Beginning balance $ 370,711 $ — Net income 13,848 14,060 Distributions to partners (13,848 ) (14,060 ) Issuance of units 185,102 555,813 Series D Preferred Unit accretion 4,031 4,031 Ending balance $ 559,844 $ 559,844

PARTNERS' EQUITY

PARTNERS' EQUITY	9 Months Ended
	Sep. 30, 2018
Partners' Capital Notes [Abstract]
PARTNERS' EQUITY	PARTNERS' EQUITY Please refer to Note 2 for a discussion of the Merger. Issuance of Common Units On June 29, 2018, we issued 413,736 common units at a price of $24.17 per unit to William E. Greehey, Chairman of the Board of Directors of NuStar GP, LLC. We used the proceeds of $10.2 million from the sale of these units, including a contribution of $0.2 million from our general partner to maintain the 2% general partner economic interest it owned at that time, for general partnership purposes. Partners’ Equity Activity The following table summarizes changes to our partners’ equity, which excludes the carrying value of the Series D Preferred Units (in thousands of dollars): Balance as of January 1, 2018 $ 2,480,089 Net income 189,608 Unit-based compensation 6,559 Other comprehensive income 23,204 Distributions to partners (284,605 ) Issuance of common units, including contribution from general partner 10,204 Adjustments related to the Merger (refer to Note 2 for discussion) (67,972 ) Series D Preferred Unit accretion (refer to Note 11 for discussion) (4,031 ) Other (6,174 ) Balance as of September 30, 2018 $ 2,346,882 Cash Distributions General Partner and Common Limited Partners . We make quarterly distributions to common unitholders, and, prior to the Merger, made quarterly distributions to the general partner 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. Prior to the Merger, our available cash was distributed based on the percentages shown below: Percentage of Distribution Quarterly Distribution Amount per Common Unit Common Unitholders General Partner Including Incentive Distributions Up to $0.60 98% 2% Above $0.60 up to $0.66 90% 10% Above $0.66 75% 25% The general partner was not allocated distributions beginning with the second quarter of 2018 as a result of the Merger, which was effective prior to the record date for the second quarter distribution. Beginning with the second quarter of 2018, the common limited partners’ distribution includes the additional common units issued in exchange for previously outstanding NSH units because the Merger closed prior to the common unit distribution record date for the second quarter of 2018. The following table reflects the allocation of total cash distributions to the general partner and common limited partners applicable to the period in which the distributions were earned: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars, Except Per Unit Data) General partner interest $ — $ 2,302 $ 1,141 $ 6,947 General partner incentive distribution — 10,912 — 34,736 Total general partner distribution — 13,214 1,141 41,683 Common limited partners’ distribution 64,248 101,870 184,369 305,652 Total cash distributions $ 64,248 $ 115,084 $ 185,510 $ 347,335 Cash distributions per unit applicable to common limited partners $ 0.60 $ 1.095 $ 1.800 $ 3.285 The following table summarizes information about our quarterly cash distributions to our general partner, prior to the Merger, and to our common limited partners: Quarter Ended Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) September 30, 2018 $ 0.600 $ 64,248 November 8, 2018 November 14, 2018 June 30, 2018 $ 0.600 $ 64,205 August 7, 2018 August 13, 2018 March 31, 2018 $ 0.600 $ 57,057 May 8, 2018 May 14, 2018 December 31, 2017 $ 1.095 $ 115,267 February 8, 2018 February 13, 2018 Preferred Units. The following table summarizes information about our cash distributions on our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units : Period Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) Series A Preferred Units: September 15, 2018 - December 14, 2018 $ 0.53125 $ 4,813 December 3, 2018 December 17, 2018 June 15, 2018 - September 14, 2018 $ 0.53125 $ 4,813 September 4, 2018 September 17, 2018 March 15, 2018 - June 14, 2018 $ 0.53125 $ 4,813 June 1, 2018 June 15, 2018 December 15, 2017 - March 14, 2018 $ 0.53125 $ 4,813 March 1, 2018 March 15, 2018 Series B Preferred Units: September 15, 2018 - December 14, 2018 $ 0.47657 $ 7,339 December 3, 2018 December 17, 2018 June 15, 2018 - September 14, 2018 $ 0.47657 $ 7,339 September 4, 2018 September 17, 2018 March 15, 2018 - June 14, 2018 $ 0.47657 $ 7,339 June 1, 2018 June 15, 2018 December 15, 2017 - March 14, 2018 $ 0.47657 $ 7,339 March 1, 2018 March 15, 2018 Series C Preferred Units: September 15, 2018 to December 14, 2018 $ 0.56250 $ 3,881 December 3, 2018 December 17, 2018 June 15, 2018 to September 14, 2018 $ 0.56250 $ 3,881 September 4, 2018 September 17, 2018 March 15, 2018 to June 14, 2018 $ 0.56250 $ 3,881 June 1, 2018 June 15, 2018 November 30, 2017 - March 14, 2018 $ 0.65625 $ 4,528 March 1, 2018 March 15, 2018 Allocations of Net Income Our partnership agreement sets forth the calculation to be used to determine the amount and priority of cash distributions that the unitholders will receive and, prior to the Merger, the general partner received. The partnership agreement also contains provisions for the allocation of net income to the unitholders and, prior to the Merger, to the general partner. Our net income for each quarterly reporting period is first allocated to the preferred limited partner unitholders in an amount equal to the earned distributions for the respective reporting period and, prior to the Merger, then to the general partner in an amount equal to the general partner’s incentive distribution calculated based upon the declared distribution for the respective reporting period. Prior to the Merger, we allocated the remaining net income or loss among the common unitholders ( 98% ) and general partner ( 2% ), as set forth in our partnership agreement. Accumulated Other Comprehensive Income (Loss) The balance of and changes in the components included in AOCI were as follows: Foreign Currency Translation Cash Flow Hedges Pension and Other Postretirement Benefits Total (Thousands of Dollars) Balance as of January 1, 2018 $ (51,603 ) $ (24,304 ) $ (9,020 ) $ (84,927 ) Other comprehensive (loss) income: Other comprehensive (loss) income before reclassification adjustments (6,536 ) 26,067 — 19,531 Net gain on pension costs reclassified into other income, net — — (611 ) (611 ) Net loss on cash flow hedges reclassified into interest expense, net — 4,271 — 4,271 Other 60 — (47 ) 13 Other comprehensive (loss) income (6,476 ) 30,338 (658 ) 23,204 Balance as of September 30, 2018 $ (58,079 ) $ 6,034 $ (9,678 ) $ (61,723 )

REVENUE FROM CONTRACTS WITH CUS

REVENUE FROM CONTRACTS WITH CUSTOMERS	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS [Text Block]	REVENUE FROM CONTRACTS WITH CUSTOMERS Transition On January 1, 2018, we adopted Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (ASC Topic 606) using the modified retrospective method and applying ASC Topic 606 to all revenue contracts with customers. Results for reporting periods beginning after January 1, 2018 are presented under ASC Topic 606. In accordance with the modified retrospective approach, prior period amounts were not adjusted and are reported under ASC Topic 605, “Revenue Recognition.” The adoption of ASC Topic 606 affected our consolidated statements of comprehensive income as follows: As Reported Without Adoption of ASC Topic 606 Effect of Change Higher/(Lower) (Thousands of Dollars, Except Per Unit Data) For the three months ended September 30, 2018: Revenues $ 490,363 $ 490,799 $ (436 ) Operating income $ 95,277 $ 95,713 $ (436 ) Net income $ 48,136 $ 48,572 $ (436 ) Basic net loss per common unit $ (3.49 ) $ (3.49 ) $ — For the nine months ended September 30, 2018: Revenues $ 1,452,448 $ 1,457,231 $ (4,783 ) Operating income $ 273,595 $ 278,378 $ (4,783 ) Net income $ 203,668 $ 208,451 $ (4,783 ) Basic net loss per common unit $ (2.50 ) $ (2.45 ) $ (0.05 ) Revenue-Generating Activities Revenues for the pipeline segment are derived from interstate and intrastate pipeline transportation of refined products, crude oil and anhydrous ammonia and the applicable pipeline tariff. Revenues for the storage segment include fees for tank storage agreements, whereby a customer agrees to pay for a certain amount of storage in a tank over a period of time (storage terminal revenues), and throughput agreements, whereby a customer pays a fee per barrel for volumes moving through our terminals (throughput terminal revenues). Our terminals also provide blending, additive injections, handling and filtering services for which we charge additional fees, and certain of our facilities charge fees to provide marine services such as pilotage, tug assistance, line handling, launch service, emergency response services and other ship services (all of which are considered optional services). Revenues for the fuels marketing segment are derived from the sale of petroleum products. Within our pipeline and storage segments, we provide services on an uninterruptible and interruptible basis. Uninterruptible services within our pipeline segment typically result from contracts that contain take-or-pay minimum volume commitments (MVCs) from the customer. Contracts with MVCs obligate the customer to pay for that minimum amount. If a customer fails to meet its MVC for the applicable service period, the customer is obligated to pay a deficiency fee based upon the shortfall between the actual volumes transported or stored and the MVC for that service period (deficiency payments). In exchange, those contracts with MVCs obligate us to stand ready to transport volumes up to the customer’s MVC. Within our storage segment, uninterruptible services arise from contracts containing a fixed monthly fee for the portion of storage capacity reserved by the customer. These contracts require that the customer pay the fixed monthly fee, regardless of whether or not it uses our storage facility (i.e., take-or-pay obligation), and that we stand ready to store that volume. Interruptible services within our pipeline and storage segments are generally provided when and to the extent we determine the requested capacity is available. The customer typically pays a per-unit rate for the actual quantities of services it receives. Revenue Recognition After identifying a contract with a customer, ASC Topic 606 requires us to (i) identify the performance obligations in the contract; (ii) determine the transaction price; (iii) allocate the transaction price to the performance obligations; and (iv) recognize revenue when or as we satisfy a performance obligation. For the majority of our contracts, we recognize revenue in the amount to which we have a right to invoice. Generally, payment terms do not exceed 30 days. Performance Obligations. The majority of our contracts contain a single performance obligation. For our pipeline segment, the single performance obligation encompasses multiple activities necessary to deliver our customers’ products to their destinations. Typically, we satisfy this performance obligation over time as the product volume is delivered in or out of the pipelines. Similarly, the performance obligation for our storage segment consists of multiple activities necessary to receive, store and deliver our customers’ products. We typically satisfy this performance obligation over time as the product volume is delivered in or out of the tanks (for throughput terminal revenues) or with the passage of time (for storage terminal revenues). Certain of our pipeline segment customer contracts include an incentive pricing structure, which provides a discounted rate for the remainder of the contract once the customer exceeds a cumulative volume. The ability to receive discounted future services represents a material right to the customer, which results in a second performance obligation in those contracts. Product sales contracts associated with our fuels marketing segment generally include a single performance obligation to deliver specified volumes of a commodity, which we satisfy at a point in time, when the product is delivered and the customer obtains control of the commodity. Optional services do not provide a material right to the customer, and are not considered a separate performance obligation in the contract. If and when a customer elects an optional service, it becomes part of the existing performance obligation. Transaction Price. For uninterruptible services, we determine the transaction price at contract inception based on the guaranteed minimum amount of revenue over the term of the contract. For interruptible services and optional services, we determine the transaction price based on our right to invoice the customer for the value of services provided to the customer for the applicable period. In certain instances, our customers reimburse us for capital projects, in arrangements referred to as contributions in aid of construction, or CIAC. Typically, in these instances, we receive upfront payments for future services, which are included in the transaction price of the underlying service contract. We collect taxes on certain revenue transactions to be remitted to governmental authorities, which may include sales, use, value-added and some excise taxes. These taxes are not included in the transaction price and are, therefore, excluded from revenues. Allocation of Transaction Price. We allocate the transaction price to the single performance obligation that exists in the vast majority of our contracts with customers. For the few contracts that have a second performance obligation, such as those that include an incentive pricing structure, we calculate an average rate based on the estimated total volumes to be delivered over the term of the contract and the resulting estimated total revenue to be billed using the applicable rates in the contract. We allocate the transaction price to the two performance obligations by applying the average rate to product volumes as they are delivered to the customer over the term of the contract. Determining the timing and amount of volumes subject to these incentive pricing contracts requires judgment that can impact the amount of revenue allocated to the two separate performance obligations. We base our estimates on our analysis of expected future production information available from our customers or other sources, which we update at least quarterly. Some of our MVC contracts include provisions that allow the customer to apply deficiency payments to future service periods (the carryforward period). In those instances, we have not satisfied our performance obligation as we still have the obligation to perform those services, subject to contractual and/or capacity constraints, at the customer’s request. At least quarterly, we assess the customer’s ability to utilize any deficiency payments during the carryforward period. If we receive a deficiency payment from a customer that we expect the customer to utilize during the carryforward period, we defer that amount as a contract liability. We will consider the performance obligation satisfied and allocate any deferred deficiency payments to our performance obligation when the customer utilizes the deficiency payment, the carryforward period ends or we determine the customer cannot or will not utilize the deficiency payment (i.e. breakage). If our contract does not allow the customer to apply deficiency payments to future service periods, we allocate the deficiency payment to the already satisfied portion of the performance obligation. Contract Assets and Contract Liabilities The following table provides information about contract assets and contract liabilities from contracts with customers: Contract Assets Contract Liabilities (Thousands of Dollars) Balance as of January 1, 2018 $ 2,127 $ (60,464 ) Additions 1,086 (64,492 ) Transfer to accounts receivable (2,576 ) — Transfer to revenues — 42,417 Total activity (1,490 ) (22,075 ) Balance as of September 30, 2018 637 (82,539 ) Less current portion 227 (45,456 ) Noncurrent portion $ 410 $ (37,083 ) Contract assets relate to performance obligations satisfied in advance of scheduled billings. Current contract assets are included in “Other current assets” and noncurrent contract assets are included in “Other long-term assets, net” on the consolidated balance sheet. Contract liabilities relate to payments received in advance of satisfying performance obligations under a contract, which may result from contracts with MVCs, contracts with an incentive pricing structure and CIAC payments. Current contract liabilities are included in “Accrued liabilities” and noncurrent contract liabilities are included in “Other long-term liabilities” on the consolidated balance sheet. In the third quarter of 2018, we entered into an agreement whereby our customer transferred ownership of crude oil to us, and we agreed to sell the crude oil and apply the proceeds as a non-refundable, one-time payment of storage fees. At the time of the agreement, we recognized a contract liability and a current asset, included in “Other current assets” on the consolidated balance sheet, of $37.5 million . In the second quarter of 2018, one customer for whom we had recorded a contract liability to perform future services elected not to extend the term of its terminal storage contract, thus reducing our future performance obligation. As a result, we reduced the related contract liability and recognized $9.0 million in revenue. 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 September 30, 2018 (in thousands of dollars): 2018 (remaining) $ 126,787 2019 411,841 2020 255,824 2021 171,557 2022 130,517 Thereafter 434,274 Total $ 1,530,800 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 MVC payment obligations. Disaggregation of Revenues The following table disaggregates our revenues: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars) Pipeline segment: Crude oil pipelines (excluding lessor revenues) $ 67,543 $ 53,490 $ 181,487 $ 137,276 Refined products and ammonia pipelines 95,300 83,936 268,368 248,130 Total pipeline segment revenues from contracts with customers 162,843 137,426 449,855 385,406 Lessor revenues — — 54 — Total pipeline segment revenues 162,843 137,426 449,909 385,406 Storage segment: Throughput terminals 21,143 21,120 61,300 63,932 Storage terminals (excluding lessor revenues) 123,024 127,169 375,721 370,784 Total storage segment revenues from contracts with customers 144,167 148,289 437,021 434,716 Lessor revenues 9,963 9,782 29,887 29,345 Total storage segment revenues 154,130 158,071 466,908 464,061 Fuels marketing segment revenues from contracts with customers 175,109 147,463 541,430 524,083 Consolidation and intersegment eliminations (1,719 ) (2,394 ) (5,799 ) (10,066 ) Total revenues $ 490,363 $ 440,566 $ 1,452,448 $ 1,363,484

NET (LOSS) INCOME PER COMMON UN

NET (LOSS) INCOME PER COMMON UNIT	9 Months Ended
	Sep. 30, 2018
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 and, prior to the Merger, included our general partner’s interest. 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. As discussed in Note 11, 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 and nine months ended September 30, 2018 , the effect of the assumed conversion of the 23,246,650 Series D Preferred Units outstanding as of September 30, 2018 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 September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars, Except Unit and Per Unit Data) Net income $ 48,136 $ 38,592 $ 203,668 $ 122,782 Distributions to preferred limited partners (29,881 ) (12,153 ) (62,116 ) (26,916 ) Distributions to general partner (including incentive distribution rights) — (13,214 ) (1,141 ) (41,683 ) Distributions to common limited partners (64,248 ) (101,870 ) (184,369 ) (305,652 ) Distribution equivalent rights to restricted units (473 ) (707 ) (1,398 ) (2,134 ) Distributions in excess of earnings $ (46,466 ) $ (89,352 ) $ (45,356 ) $ (253,603 ) Distributions to common limited partners $ 64,248 $ 101,870 $ 184,369 $ 305,652 Allocation of distributions in excess of earnings (46,466 ) (87,565 ) (45,378 ) (248,531 ) Series D Preferred Unit accretion (refer to Note 11) (4,031 ) — (4,031 ) — Loss to common unitholders attributable to the (377,079 ) — (377,079 ) — Net (loss) income attributable to common units: $ (363,328 ) $ 14,305 $ (242,119 ) $ 57,121 Basic weighted-average common units outstanding 104,264,796 93,031,320 96,920,202 87,392,597 Basic net (loss) income per common unit $ (3.49 ) $ 0.15 $ (2.50 ) $ 0.65

STATEMENTS OF CASH FLOWS

STATEMENTS OF CASH FLOWS	9 Months Ended
	Sep. 30, 2018
Statement of Cash Flows [Abstract]
STATEMENTS OF CASH FLOWS	STATEMENTS OF CASH FLOWS Changes in current assets and current liabilities were as follows: Nine Months Ended September 30, 2018 2017 (Thousands of Dollars) Decrease (increase) in current assets: Accounts receivable $ 11,530 $ 24,538 Receivable from related party 160 236 Inventories 2,079 15,497 Other current assets (953 ) 1,176 Increase (decrease) in current liabilities: Accounts payable 18,082 (52,910 ) Accrued interest payable (9,700 ) 7,829 Accrued liabilities 4,830 (10,702 ) Taxes other than income tax 4,809 279 Income tax payable 406 (3,614 ) Changes in current assets and current liabilities $ 31,243 $ (17,671 ) The above changes in current assets and current liabilities differ from changes between amounts reflected in the applicable consolidated balance sheets due to: • current assets and current liabilities acquired during the period; • the change in the amount accrued for capital expenditures; • the effect of foreign currency translation; and • changes in the fair values of our interest rate swap agreements. Cash flows related to interest and income taxes were as follows: Nine Months Ended September 30, 2018 2017 (Thousands of Dollars) Cash paid for interest, net of amount capitalized $ 145,089 $ 112,335 Cash paid for income taxes, net of tax refunds received $ 8,490 $ 10,090

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION Our reportable business segments consist of the pipeline, storage and fuels marketing segments. Our segments represent strategic business units that offer different services and products. We evaluate the performance of each segment based on its respective operating income, before general and administrative expenses and certain non-segmental depreciation and amortization expense. General and administrative expenses are not allocated to the operating segments since those expenses relate primarily to the overall management at the entity level. Our principal operations include the transportation of petroleum products and anhydrous ammonia, and the terminalling, storage and marketing of petroleum products. Intersegment revenues result from storage agreements with wholly owned subsidiaries of NuStar Energy at rates consistent with the rates charged to third parties for storage. Results of operations for the reportable segments were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars) Revenues: Pipeline $ 162,843 $ 137,426 $ 449,909 $ 385,406 Storage: Third parties 152,411 155,677 461,109 453,995 Intersegment 1,719 2,394 5,799 10,066 Total storage 154,130 158,071 466,908 464,061 Fuels marketing 175,109 147,463 541,430 524,083 Consolidation and intersegment eliminations (1,719 ) (2,394 ) (5,799 ) (10,066 ) Total revenues $ 490,363 $ 440,566 $ 1,452,448 $ 1,363,484 Operating income: Pipeline $ 77,021 $ 61,119 $ 197,794 $ 179,015 Storage 46,459 59,323 146,904 169,131 Fuels marketing 1,890 (1,532 ) 11,114 3,897 Consolidation and intersegment eliminations — (1 ) — — Total segment operating income 125,370 118,909 355,812 352,043 General and administrative expenses 27,817 25,003 75,572 83,202 Other depreciation and amortization expense 2,276 2,189 6,645 6,581 Total operating income $ 95,277 $ 91,717 $ 273,595 $ 262,260 Total assets by reportable segment were as follows: September 30, December 31, (Thousands of Dollars) Pipeline $ 3,606,413 $ 3,492,417 Storage 2,787,886 2,735,563 Fuels marketing 132,497 118,746 Total segment assets 6,526,796 6,346,726 Other partnership assets 194,162 188,507 Total consolidated assets $ 6,720,958 $ 6,535,233

CONDENSED CONSOLIDATING FINANCI

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS	9 Months Ended
	Sep. 30, 2018
CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]
CONDENSED CONSOLIDATING FINANCIAL STATEMENTS	CONDENSED CONSOLIDATING FINANCIAL STATEMENTS NuStar Energy has no operations, and its assets consist mainly of its 100% indirectly owned subsidiaries, NuStar Logistics and NuPOP. The senior and subordinated notes issued by NuStar Logistics are fully and unconditionally guaranteed by NuStar Energy and NuPOP. As a result, the following condensed consolidating financial statements are presented as an alternative to providing separate financial statements for NuStar Logistics and NuPOP. Condensed Consolidating Balance Sheets September 30, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 1,164 $ 4,238 $ — $ 19,177 $ — $ 24,579 Receivables, net — 82 — 164,686 — 164,768 Inventories — 1,875 6,822 16,064 — 24,761 Other current assets 122 16,961 1,284 44,399 — 62,766 Intercompany receivable 187,967 2,726,465 — — (2,914,432 ) — Total current assets 189,253 2,749,621 8,106 244,326 (2,914,432 ) 276,874 Property, plant and equipment, net — 1,846,330 619,284 2,019,234 — 4,484,848 Intangible assets, net — 51,463 — 694,449 — 745,912 Goodwill — 149,453 170,652 774,556 — 1,094,661 Investment in wholly owned subsidiaries 2,793,521 29,961 1,450,865 849,825 (5,124,172 ) — Other long-term assets, net 303 77,144 26,861 14,355 — 118,663 Total assets $ 2,983,077 $ 4,903,972 $ 2,275,768 $ 4,596,745 $ (8,038,604 ) $ 6,720,958 Liabilities, Mezzanine Equity and Partners’ Equity Accounts payable $ 13,636 $ 26,423 $ 5,935 $ 108,218 $ — $ 154,212 Short-term debt — 10,500 — — — 10,500 Accrued interest payable — 30,785 — 60 — 30,845 Accrued liabilities 929 16,608 7,971 71,790 — 97,298 Taxes other than income tax 63 7,152 5,893 6,587 — 19,695 Income tax payable — 364 — 4,212 — 4,576 Intercompany payable — — 1,393,208 1,521,224 (2,914,432 ) — Total current liabilities 14,628 91,832 1,413,007 1,712,091 (2,914,432 ) 317,126 Long-term debt, less current portion — 3,313,528 — 63,324 — 3,376,852 Deferred income tax liability — 1,262 12 22,069 — 23,343 Other long-term liabilities — 45,099 13,124 38,688 — 96,911 Series D preferred units 559,844 — — — — 559,844 Total partners’ equity 2,408,605 1,452,251 849,625 2,760,573 (5,124,172 ) 2,346,882 Total liabilities, mezzanine equity and partners’ equity $ 2,983,077 $ 4,903,972 $ 2,275,768 $ 4,596,745 $ (8,038,604 ) $ 6,720,958 Condensed Consolidating Balance Sheets December 31, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 885 $ 29 $ — $ 23,378 $ — $ 24,292 Receivables, net — 280 — 176,495 — 176,775 Inventories — 1,686 8,611 16,560 — 26,857 Other current assets 61 11,412 4,191 6,844 — 22,508 Intercompany receivable — 3,112,164 — — (3,112,164 ) — Total current assets 946 3,125,571 12,802 223,277 (3,112,164 ) 250,432 Property, plant and equipment, net — 1,893,720 591,070 1,816,143 — 4,300,933 Intangible assets, net — 58,530 — 725,949 — 784,479 Goodwill — 149,453 170,652 777,370 — 1,097,475 Investment in wholly owned subsidiaries 2,891,371 24,162 1,301,717 790,882 (5,008,132 ) — Deferred income tax asset — — — 233 — 233 Other long-term assets, net 303 65,684 27,493 8,201 — 101,681 Total assets $ 2,892,620 $ 5,317,120 $ 2,103,734 $ 4,342,055 $ (8,120,296 ) $ 6,535,233 Liabilities and Partners’ Equity Accounts payable $ 4,078 $ 27,642 $ 13,160 $ 101,052 $ — $ 145,932 Short-term debt — 35,000 — — — 35,000 Current portion of long-term debt — 349,990 — — — 349,990 Accrued interest payable — 40,402 — 47 — 40,449 Accrued liabilities 1,105 17,628 9,450 33,395 — 61,578 Taxes other than income tax 125 7,110 3,794 3,356 — 14,385 Income tax payable — 732 4 3,436 — 4,172 Intercompany payable 322,296 — 1,277,691 1,512,177 (3,112,164 ) — Total current liabilities 327,604 478,504 1,304,099 1,653,463 (3,112,164 ) 651,506 Long-term debt, less current portion — 3,201,220 — 61,849 — 3,263,069 Deferred income tax liability — 1,262 12 20,998 — 22,272 Other long-term liabilities — 58,806 8,861 50,630 — 118,297 Total partners’ equity 2,565,016 1,577,328 790,762 2,555,115 (5,008,132 ) 2,480,089 Total liabilities and partners’ equity $ 2,892,620 $ 5,317,120 $ 2,103,734 $ 4,342,055 $ (8,120,296 ) $ 6,535,233 Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended September 30, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 127,165 $ 62,981 $ 300,323 $ (106 ) $ 490,363 Costs and expenses 600 76,932 40,497 277,163 (106 ) 395,086 Operating (loss) income (600 ) 50,233 22,484 23,160 — 95,277 Equity in earnings of subsidiaries 48,668 9,405 13,884 34,607 (106,564 ) — Interest income (expense), net 68 (45,532 ) (1,882 ) 2,521 — (44,825 ) Other income, net — 468 119 333 — 920 Income before income tax expense 48,136 14,574 34,605 60,621 (106,564 ) 51,372 Income tax expense — 82 — 3,154 — 3,236 Net income $ 48,136 $ 14,492 $ 34,605 $ 57,467 $ (106,564 ) $ 48,136 Comprehensive income $ 48,136 $ 19,751 $ 34,605 $ 57,109 $ (106,564 ) $ 53,037 Condensed Consolidating Statements of Comprehensive Income (Loss) For the Three Months Ended September 30, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 127,980 $ 58,871 $ 253,854 $ (139 ) $ 440,566 Costs and expenses 332 77,668 38,709 232,279 (139 ) 348,849 Operating (loss) income (332 ) 50,312 20,162 21,575 — 91,717 Equity in earnings (loss) of subsidiaries 38,896 (4,558 ) 20,809 39,508 (94,655 ) — Interest income (expense), net 28 (46,247 ) (1,455 ) 2,418 — (45,256 ) Other income (expense), net — 57 (8 ) (5,175 ) — (5,126 ) Income (loss) before income tax expense 38,592 (436 ) 39,508 58,326 (94,655 ) 41,335 Income tax expense — 115 1 2,627 — 2,743 Net income (loss) $ 38,592 $ (551 ) $ 39,507 $ 55,699 $ (94,655 ) $ 38,592 Comprehensive income (loss) $ 38,592 $ (1,031 ) $ 39,507 $ 62,069 $ (94,655 ) $ 44,482 Condensed Consolidating Statements of Comprehensive Income For the Nine Months Ended September 30, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 364,721 $ 185,760 $ 902,422 $ (455 ) $ 1,452,448 Costs and expenses 1,750 235,936 118,002 823,620 (455 ) 1,178,853 Operating (loss) income (1,750 ) 128,785 67,758 78,802 — 273,595 Equity in earnings of subsidiaries 205,281 8,848 149,032 211,919 (575,080 ) — Interest income (expense), net 137 (145,915 ) (5,177 ) 9,422 — (141,533 ) Other income, net — 2,792 307 78,985 — 82,084 Income (loss) before income tax expense 203,668 (5,490 ) 211,920 379,128 (575,080 ) 214,146 Income tax expense — 313 1 10,164 — 10,478 Net income (loss) $ 203,668 $ (5,803 ) $ 211,919 $ 368,964 $ (575,080 ) $ 203,668 Comprehensive income $ 203,668 $ 24,535 $ 211,919 $ 361,830 $ (575,080 ) $ 226,872 Condensed Consolidating Statements of Comprehensive Income (Loss) For the Nine Months Ended September 30, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 380,504 $ 161,689 $ 822,064 $ (773 ) $ 1,363,484 Costs and expenses 1,327 237,086 106,296 757,288 (773 ) 1,101,224 Operating (loss) income (1,327 ) 143,418 55,393 64,776 — 262,260 Equity in earnings (loss) of 124,073 (10,625 ) 69,770 121,002 (304,220 ) — Interest income (expense), net 36 (129,551 ) (4,160 ) 6,393 — (127,282 ) Other income (expense), net — 140 1 (5,039 ) — (4,898 ) Income before income tax expense 122,782 3,382 121,004 187,132 (304,220 ) 130,080 Income tax expense — 81 3 7,214 — 7,298 Net income $ 122,782 $ 3,301 $ 121,001 $ 179,918 $ (304,220 ) $ 122,782 Comprehensive income (loss) $ 122,782 $ (1,592 ) $ 121,001 $ 195,595 $ (304,220 ) $ 133,566 Condensed Consolidating Statements of Cash Flows For the Nine Months Ended September 30, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 296,475 $ 60,254 $ 90,482 $ 361,320 $ (445,211 ) $ 363,320 Cash flows from investing activities: Capital expenditures — (32,270 ) (14,002 ) (292,168 ) — (338,440 ) Change in accounts payable related to capital expenditures — 2,063 (6,209 ) (14,484 ) — (18,630 ) Proceeds from sale or disposition of assets — 1,464 20 736 — 2,220 Proceeds from insurance recoveries — — — 78,419 — 78,419 Acquisitions — — (37,502 ) — — (37,502 ) Investment in other long-term — — — (3,280 ) — (3,280 ) Net cash used in investing activities — (28,743 ) (57,693 ) (230,777 ) — (317,213 ) Cash flows from financing activities: Debt borrowings — 1,498,853 — 25,100 — 1,523,953 Debt repayments — (1,754,798 ) — (23,700 ) — (1,778,498 ) Issuance of Series D preferred units 590,000 — — — — 590,000 Payment of issuance costs for Series D preferred units (34,187 ) — — — — (34,187 ) Issuance of common units 10,000 — — — — 10,000 General partner contribution 204 — — — — 204 Distributions to preferred unitholders (60,249 ) (30,123 ) (30,124 ) (30,123 ) 90,372 (60,247 ) Distributions to common unitholders and general partner (236,549 ) (118,275 ) (118,274 ) (118,290 ) 354,839 (236,549 ) Cash consideration for Merger (Note 2) (61,411 ) — — 140 — (61,271 ) Proceeds from termination of interest rate swaps — 8,048 — — — 8,048 Net intercompany activity (501,574 ) 373,055 115,609 12,910 — — Other, net (2,430 ) (4,062 ) — (62 ) — (6,554 ) Net cash used in financing activities (296,196 ) (27,302 ) (32,789 ) (134,025 ) 445,211 (45,101 ) Effect of foreign exchange rate changes on cash — — — (719 ) — (719 ) Net increase (decrease) in cash and cash equivalents 279 4,209 — (4,201 ) — 287 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 $ 1,164 $ 4,238 $ — $ 19,177 $ — $ 24,579 Condensed Consolidating Statements of Cash Flows For the Nine Months Ended September 30, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 355,864 $ 128,395 $ 72,711 $ 290,917 $ (536,872 ) $ 311,015 Cash flows from investing activities: Capital expenditures — (34,964 ) (18,138 ) (167,515 ) — (220,617 ) Change in accounts payable related to capital expenditures — (1,223 ) 4,445 10,050 — 13,272 Proceeds from sale or disposition of assets — 1,947 17 59 — 2,023 Investment in subsidiaries (1,262,000 ) — — (126 ) 1,262,126 — Proceeds from Axeon term loan — 110,000 — — — 110,000 Acquisitions — — — (1,461,719 ) — (1,461,719 ) Net cash (used in) provided by investing activities (1,262,000 ) 75,760 (13,676 ) (1,619,251 ) 1,262,126 (1,557,041 ) Cash flows from financing activities: Debt borrowings — 1,901,504 — 69,700 — 1,971,204 Debt repayments — (1,856,739 ) — (82,000 ) — (1,938,739 ) Note offering, net of issuance costs — 543,313 — — — 543,313 Issuance of other preferred units, net of issuance costs 371,802 — — — — 371,802 Issuance of common units, net of issuance costs 643,858 — — — — 643,858 General partner contribution 13,597 — — — — 13,597 Distributions to preferred unitholders (26,681 ) (13,340 ) (13,341 ) (13,342 ) 40,023 (26,681 ) Distributions to common unitholders and general partner (331,222 ) (165,611 ) (165,611 ) (165,627 ) 496,849 (331,222 ) Contributions from affiliates — 1,262,000 — 126 (1,262,126 ) — Net intercompany activity 238,172 (1,873,773 ) 119,917 1,515,684 — — Other, net (3,366 ) (1,486 ) — (218 ) — (5,070 ) Net cash provided by (used) in financing activities 906,160 (204,132 ) (59,035 ) 1,324,323 (725,254 ) 1,242,062 Effect of foreign exchange rate changes on cash — — — 1,637 — 1,637 Net increase (decrease) in cash and cash equivalents 24 23 — (2,374 ) — (2,327 ) Cash and cash equivalents as of the beginning of the period 870 5 — 35,067 — 35,942 Cash and cash equivalents as of the end of the period $ 894 $ 28 $ — $ 32,693 $ — $ 33,615

SUBSEQUENT EVENT

SUBSEQUENT EVENT	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENT On October 30, 2018, we announced that we entered into an agreement to sell our European terminals and related assets to Inter Pipeline Ltd.’s European storage subsidiary, Inter Terminals Ltd., for $270.0 million . Our European assets, which include six liquids storage terminals in the United Kingdom and one facility in Amsterdam, are not geographically synergistic with our other operations, and the sale is part of our plan to lower our leverage. The sale is expected to close in the fourth quarter of 2018, subject to normal closing adjustments.

MERGER (Tables)

MERGER (Tables)	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Calculation of loss attributable to the Merger [Table Text Block]	The excess of (1) the fair value of the consideration transferred in exchange for the outstanding NSH units over (2) the carrying value of the general partner interest in the Partnership was subtracted from net income available to common unitholders in the calculation of net loss per common unit attributable to the Merger as follows (in thousands of dollars, except unit and per unit data): Consideration transferred: Fair value of incremental NS common units issued $ 335,106 NSH debt and net current liabilities assumed 52,075 Transaction costs, including accrued costs 15,897 Total consideration 403,078 Carrying value of general partner interest 25,999 Loss to common unitholders attributable to the Merger $ (377,079 ) For the three months ended September 30, 2018: Basic weighted-average common units outstanding 104,264,796 Loss per common unit attributable to the Merger $ (3.62 )

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table reflects the final purchase price allocation: Purchase Price Allocation (Thousands of Dollars) Accounts receivable $ 4,747 Other current assets 2,359 Property, plant and equipment, net 376,690 Intangible assets (a) 700,000 Goodwill (b) 398,024 Other long-term assets, net 2,199 Current liabilities (22,300 ) Purchase price allocation, net of cash acquired $ 1,461,719 (a) Intangible assets, which consist of customer contracts and relationships, are amortized on a straight-line basis over a period of 20 years . (b) The goodwill acquired represents the expected benefit from entering new geographic areas and the anticipated opportunities to generate future cash flows from the assets acquired and potential future projects.
Business Acquisition, Pro Forma Information [Table Text Block]	The unaudited pro forma information for the nine months ended September 30, 2017 below presents the combined historical financial information for Navigator and the Partnership for those periods. This information assumes: • we completed the Navigator Acquisition on January 1, 2017; • we issued approximately 14.4 million common units; • we received a contribution from our general partner of $13.6 million to maintain the 2% general partner economic interest it owned at that time; • we issued 15.4 million Series B Preferred Units; • we issued $550.0 million of 5.625% senior notes; • additional depreciation and amortization that would have been incurred assuming the fair value adjustments to property, plant and equipment and intangible assets reflected in the purchase price allocation above; and • we satisfied Navigator’s outstanding obligations under its revolving credit agreement. Nine Months Ended September 30, 2017 (Thousands of Dollars, Except Per Unit Data) Revenues $ 1,377,883 Net income $ 102,251 Basic net income per common unit $ 0.31

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	The following assets and liabilities are measured at fair value on a recurring basis: September 30, 2018 Level 1 Level 2 Level 3 Total (Thousands of Dollars) Assets: Other long-term assets, net: Interest rate swaps $ — $ 8,031 $ — $ 8,031 Liabilities: Accrued liabilities: Commodity derivatives $ (276 ) $ — $ — $ (276 ) December 31, 2017 Level 1 Level 2 Level 3 Total (Thousands of Dollars) Assets: Other current assets: Product imbalances $ 3,890 $ — $ — $ 3,890 Liabilities: Accrued liabilities: Product imbalances $ (1,534 ) $ — $ — $ (1,534 ) Commodity derivatives (878 ) — — (878 ) Interest rate swaps — (5,394 ) — (5,394 ) Other long-term liabilities: Interest rate swaps — (4,594 ) — (4,594 ) Total liabilities $ (2,412 ) $ (9,988 ) $ — $ (12,400 )
Fair Value and Carrying Value of Debt and Note Receivable [Table Text Block]	The estimated fair values and carrying amounts of long-term debt, including the current portion, were as follows: September 30, 2018 December 31, 2017 (Thousands of Dollars) Fair value $ 3,409,199 $ 3,677,622 Carrying amount $ 3,376,852 $ 3,613,059

DERIVATIVES AND RISK MANAGEME_2

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The fair values of our derivative instruments included in our consolidated balance sheets were as follows: Asset Derivatives Liability Derivatives Balance Sheet Location September 30, December 31, September 30, December 31, (Thousands of Dollars) Derivatives Designated as Hedging Instruments: Interest rate swaps Other long-term assets, net $ 8,031 $ — $ — $ — Commodity contracts Accrued liabilities 28 — (296 ) (112 ) Interest rate swaps Accrued liabilities — — — (5,394 ) Interest rate swaps Other long-term liabilities — — — (4,594 ) Total 8,059 — (296 ) (10,100 ) Derivatives Not Designated as Hedging Instruments: Commodity contracts Accrued liabilities 5 742 (13 ) (1,508 ) Total Derivatives $ 8,064 $ 742 $ (309 ) $ (11,608 )
Derivatives Assets And Liabilities Eligible for Offset Net [Table Text Block]	The following are the net amounts presented on the consolidated balance sheets: Commodity Contracts September 30, December 31, (Thousands of Dollars) Net amounts of liabilities presented in the consolidated balance sheets $ (276 ) $ (878 )
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block]	We recognize the impact of our commodity contracts on earnings in “Cost of product sales” on the condensed consolidated statements of comprehensive income, as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars) Derivatives Designated as Fair Value Hedging Instruments: (Loss) gain recognized in income on derivative $ (294 ) $ (1,134 ) $ (1,597 ) $ 1,327 (Loss) gain recognized in income on hedged item (221 ) 1,111 997 (1,036 ) (Loss) gain recognized in income for ineffective portion $ (515 ) $ (23 ) $ (600 ) $ 291 Derivatives Not Designated as Hedging Instruments: Loss recognized in income on derivative $ (209 ) $ (132 ) $ (439 ) $ (218 ) Our interest rate swaps had the following impact on earnings: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars) Derivatives Designated as Cash Flow Hedging Instruments: Gain (loss) recognized in other comprehensive income on derivative (effective portion) $ 3,540 $ (2,064 ) $ 26,067 $ (10,005 ) Loss reclassified from AOCI into interest expense, net (effective portion) $ (1,719 ) $ (1,584 ) $ (4,271 ) $ (5,112 )

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	9 Months Ended
	Sep. 30, 2018
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	The components of net periodic benefit cost (income) related to our Pension Plans and other postretirement benefit plans were as follows: Pension Plans Other Postretirement Benefit Plans 2018 2017 2018 2017 (Thousands of Dollars) For the three months ended September 30: Service cost $ 2,405 $ 2,239 $ 126 $ 115 Interest cost 1,206 1,127 107 107 Expected return on assets (1,854 ) (1,603 ) — — Amortization of prior service credit (515 ) (515 ) (286 ) (286 ) Amortization of net loss 544 371 53 47 Net periodic benefit cost (income) $ 1,786 $ 1,619 $ — $ (17 ) For the nine months ended September 30: Service cost $ 7,216 $ 6,717 $ 378 $ 341 Interest cost 3,618 3,381 322 323 Expected return on assets (5,563 ) (4,808 ) — — Amortization of prior service credit (1,543 ) (1,546 ) (859 ) (858 ) Amortization of net loss 1,631 1,113 160 143 Net periodic benefit cost (income) $ 5,359 $ 4,857 $ 1 $ (51 )

SERIES D CUMULATIVE CONVERTIB_2

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS (Tables)	9 Months Ended
	Sep. 30, 2018
Temporary Equity Disclosure [Abstract]
Changes to Mezzanine Equity [Table Text Block]	The following table summarizes changes to our mezzanine equity: Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 (Thousands of Dollars) Beginning balance $ 370,711 $ — Net income 13,848 14,060 Distributions to partners (13,848 ) (14,060 ) Issuance of units 185,102 555,813 Series D Preferred Unit accretion 4,031 4,031 Ending balance $ 559,844 $ 559,844

PARTNERS' EQUITY (Tables)

PARTNERS' EQUITY (Tables)	9 Months Ended
	Sep. 30, 2018
Distributions Made to Limited Partners and General Partner [Line Items]
Schedule of Changes in Partners' Equity [Table Text Block]	The following table summarizes changes to our partners’ equity, which excludes the carrying value of the Series D Preferred Units (in thousands of dollars): Balance as of January 1, 2018 $ 2,480,089 Net income 189,608 Unit-based compensation 6,559 Other comprehensive income 23,204 Distributions to partners (284,605 ) Issuance of common units, including contribution from general partner 10,204 Adjustments related to the Merger (refer to Note 2 for discussion) (67,972 ) Series D Preferred Unit accretion (refer to Note 11 for discussion) (4,031 ) Other (6,174 ) Balance as of September 30, 2018 $ 2,346,882
Schedule of Distribution Waterfall [Table Text Block]	Prior to the Merger, our available cash was distributed based on the percentages shown below: Percentage of Distribution Quarterly Distribution Amount per Common Unit Common Unitholders General Partner Including Incentive Distributions Up to $0.60 98% 2% Above $0.60 up to $0.66 90% 10% Above $0.66 75% 25%
Schedule of Distributions To General and Common Limited Partners [Table Text Block]	The following table reflects the allocation of total cash distributions to the general partner and common limited partners applicable to the period in which the distributions were earned: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars, Except Per Unit Data) General partner interest $ — $ 2,302 $ 1,141 $ 6,947 General partner incentive distribution — 10,912 — 34,736 Total general partner distribution — 13,214 1,141 41,683 Common limited partners’ distribution 64,248 101,870 184,369 305,652 Total cash distributions $ 64,248 $ 115,084 $ 185,510 $ 347,335 Cash distributions per unit applicable to common limited partners $ 0.60 $ 1.095 $ 1.800 $ 3.285
Distributions Made to Common Limited and General Partners, by Distribution [Table Text Block]	The following table summarizes information about our quarterly cash distributions to our general partner, prior to the Merger, and to our common limited partners: Quarter Ended Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) September 30, 2018 $ 0.600 $ 64,248 November 8, 2018 November 14, 2018 June 30, 2018 $ 0.600 $ 64,205 August 7, 2018 August 13, 2018 March 31, 2018 $ 0.600 $ 57,057 May 8, 2018 May 14, 2018 December 31, 2017 $ 1.095 $ 115,267 February 8, 2018 February 13, 2018
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The balance of and changes in the components included in AOCI were as follows: Foreign Currency Translation Cash Flow Hedges Pension and Other Postretirement Benefits Total (Thousands of Dollars) Balance as of January 1, 2018 $ (51,603 ) $ (24,304 ) $ (9,020 ) $ (84,927 ) Other comprehensive (loss) income: Other comprehensive (loss) income before reclassification adjustments (6,536 ) 26,067 — 19,531 Net gain on pension costs reclassified into other income, net — — (611 ) (611 ) Net loss on cash flow hedges reclassified into interest expense, net — 4,271 — 4,271 Other 60 — (47 ) 13 Other comprehensive (loss) income (6,476 ) 30,338 (658 ) 23,204 Balance as of September 30, 2018 $ (58,079 ) $ 6,034 $ (9,678 ) $ (61,723 )
Preferred Limited Partner [Member]
Distributions Made to Limited Partners and General Partner [Line Items]
Distributions Made to Limited Partner, by Distribution [Table Text Block]	The following table summarizes information about our cash distributions on our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units : Period Cash Distributions Per Unit Total Cash Distributions Record Date Payment Date (Thousands of Dollars) Series A Preferred Units: September 15, 2018 - December 14, 2018 $ 0.53125 $ 4,813 December 3, 2018 December 17, 2018 June 15, 2018 - September 14, 2018 $ 0.53125 $ 4,813 September 4, 2018 September 17, 2018 March 15, 2018 - June 14, 2018 $ 0.53125 $ 4,813 June 1, 2018 June 15, 2018 December 15, 2017 - March 14, 2018 $ 0.53125 $ 4,813 March 1, 2018 March 15, 2018 Series B Preferred Units: September 15, 2018 - December 14, 2018 $ 0.47657 $ 7,339 December 3, 2018 December 17, 2018 June 15, 2018 - September 14, 2018 $ 0.47657 $ 7,339 September 4, 2018 September 17, 2018 March 15, 2018 - June 14, 2018 $ 0.47657 $ 7,339 June 1, 2018 June 15, 2018 December 15, 2017 - March 14, 2018 $ 0.47657 $ 7,339 March 1, 2018 March 15, 2018 Series C Preferred Units: September 15, 2018 to December 14, 2018 $ 0.56250 $ 3,881 December 3, 2018 December 17, 2018 June 15, 2018 to September 14, 2018 $ 0.56250 $ 3,881 September 4, 2018 September 17, 2018 March 15, 2018 to June 14, 2018 $ 0.56250 $ 3,881 June 1, 2018 June 15, 2018 November 30, 2017 - March 14, 2018 $ 0.65625 $ 4,528 March 1, 2018 March 15, 2018

REVENUE FROM CONTRACTS WITH C_2

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Schedule of Adoption of New Accounting Pronouncements [Table Text Block]	The adoption of ASC Topic 606 affected our consolidated statements of comprehensive income as follows: As Reported Without Adoption of ASC Topic 606 Effect of Change Higher/(Lower) (Thousands of Dollars, Except Per Unit Data) For the three months ended September 30, 2018: Revenues $ 490,363 $ 490,799 $ (436 ) Operating income $ 95,277 $ 95,713 $ (436 ) Net income $ 48,136 $ 48,572 $ (436 ) Basic net loss per common unit $ (3.49 ) $ (3.49 ) $ — For the nine months ended September 30, 2018: Revenues $ 1,452,448 $ 1,457,231 $ (4,783 ) Operating income $ 273,595 $ 278,378 $ (4,783 ) Net income $ 203,668 $ 208,451 $ (4,783 ) Basic net loss per common unit $ (2.50 ) $ (2.45 ) $ (0.05 )
Contract with Customer, Asset and Liability [Table Text Block]	The following table provides information about contract assets and contract liabilities from contracts with customers: Contract Assets Contract Liabilities (Thousands of Dollars) Balance as of January 1, 2018 $ 2,127 $ (60,464 ) Additions 1,086 (64,492 ) Transfer to accounts receivable (2,576 ) — Transfer to revenues — 42,417 Total activity (1,490 ) (22,075 ) Balance as of September 30, 2018 637 (82,539 ) Less current portion 227 (45,456 ) Noncurrent portion $ 410 $ (37,083 )
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 September 30, 2018 (in thousands of dollars): 2018 (remaining) $ 126,787 2019 411,841 2020 255,824 2021 171,557 2022 130,517 Thereafter 434,274 Total $ 1,530,800
Disaggregation of Revenue [Table Text Block]	The following table disaggregates our revenues: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars) Pipeline segment: Crude oil pipelines (excluding lessor revenues) $ 67,543 $ 53,490 $ 181,487 $ 137,276 Refined products and ammonia pipelines 95,300 83,936 268,368 248,130 Total pipeline segment revenues from contracts with customers 162,843 137,426 449,855 385,406 Lessor revenues — — 54 — Total pipeline segment revenues 162,843 137,426 449,909 385,406 Storage segment: Throughput terminals 21,143 21,120 61,300 63,932 Storage terminals (excluding lessor revenues) 123,024 127,169 375,721 370,784 Total storage segment revenues from contracts with customers 144,167 148,289 437,021 434,716 Lessor revenues 9,963 9,782 29,887 29,345 Total storage segment revenues 154,130 158,071 466,908 464,061 Fuels marketing segment revenues from contracts with customers 175,109 147,463 541,430 524,083 Consolidation and intersegment eliminations (1,719 ) (2,394 ) (5,799 ) (10,066 ) Total revenues $ 490,363 $ 440,566 $ 1,452,448 $ 1,363,484

NET (LOSS) INCOME PER COMMON _2

NET (LOSS) INCOME PER COMMON UNIT (Tables)	9 Months Ended
	Sep. 30, 2018
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 September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars, Except Unit and Per Unit Data) Net income $ 48,136 $ 38,592 $ 203,668 $ 122,782 Distributions to preferred limited partners (29,881 ) (12,153 ) (62,116 ) (26,916 ) Distributions to general partner (including incentive distribution rights) — (13,214 ) (1,141 ) (41,683 ) Distributions to common limited partners (64,248 ) (101,870 ) (184,369 ) (305,652 ) Distribution equivalent rights to restricted units (473 ) (707 ) (1,398 ) (2,134 ) Distributions in excess of earnings $ (46,466 ) $ (89,352 ) $ (45,356 ) $ (253,603 ) Distributions to common limited partners $ 64,248 $ 101,870 $ 184,369 $ 305,652 Allocation of distributions in excess of earnings (46,466 ) (87,565 ) (45,378 ) (248,531 ) Series D Preferred Unit accretion (refer to Note 11) (4,031 ) — (4,031 ) — Loss to common unitholders attributable to the (377,079 ) — (377,079 ) — Net (loss) income attributable to common units: $ (363,328 ) $ 14,305 $ (242,119 ) $ 57,121 Basic weighted-average common units outstanding 104,264,796 93,031,320 96,920,202 87,392,597 Basic net (loss) income per common unit $ (3.49 ) $ 0.15 $ (2.50 ) $ 0.65

STATEMENTS OF CASH FLOWS (Table

STATEMENTS OF CASH FLOWS (Tables)	9 Months Ended
	Sep. 30, 2018
Statement of Cash Flows [Abstract]
Schedule of Changes in Current Assets and Liabilities [Text Block]	Changes in current assets and current liabilities were as follows: Nine Months Ended September 30, 2018 2017 (Thousands of Dollars) Decrease (increase) in current assets: Accounts receivable $ 11,530 $ 24,538 Receivable from related party 160 236 Inventories 2,079 15,497 Other current assets (953 ) 1,176 Increase (decrease) in current liabilities: Accounts payable 18,082 (52,910 ) Accrued interest payable (9,700 ) 7,829 Accrued liabilities 4,830 (10,702 ) Taxes other than income tax 4,809 279 Income tax payable 406 (3,614 ) Changes in current assets and current liabilities $ 31,243 $ (17,671 )
Schedule of Supplemental Cash Flow Information [Text Block]	Cash flows related to interest and income taxes were as follows: Nine Months Ended September 30, 2018 2017 (Thousands of Dollars) Cash paid for interest, net of amount capitalized $ 145,089 $ 112,335 Cash paid for income taxes, net of tax refunds received $ 8,490 $ 10,090

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Results of operations for the reportable segments were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (Thousands of Dollars) Revenues: Pipeline $ 162,843 $ 137,426 $ 449,909 $ 385,406 Storage: Third parties 152,411 155,677 461,109 453,995 Intersegment 1,719 2,394 5,799 10,066 Total storage 154,130 158,071 466,908 464,061 Fuels marketing 175,109 147,463 541,430 524,083 Consolidation and intersegment eliminations (1,719 ) (2,394 ) (5,799 ) (10,066 ) Total revenues $ 490,363 $ 440,566 $ 1,452,448 $ 1,363,484 Operating income: Pipeline $ 77,021 $ 61,119 $ 197,794 $ 179,015 Storage 46,459 59,323 146,904 169,131 Fuels marketing 1,890 (1,532 ) 11,114 3,897 Consolidation and intersegment eliminations — (1 ) — — Total segment operating income 125,370 118,909 355,812 352,043 General and administrative expenses 27,817 25,003 75,572 83,202 Other depreciation and amortization expense 2,276 2,189 6,645 6,581 Total operating income $ 95,277 $ 91,717 $ 273,595 $ 262,260
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	Total assets by reportable segment were as follows: September 30, December 31, (Thousands of Dollars) Pipeline $ 3,606,413 $ 3,492,417 Storage 2,787,886 2,735,563 Fuels marketing 132,497 118,746 Total segment assets 6,526,796 6,346,726 Other partnership assets 194,162 188,507 Total consolidated assets $ 6,720,958 $ 6,535,233

CONDENSED CONSOLIDATING FINAN_2

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Tables)	9 Months Ended
	Sep. 30, 2018
CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]
Condensed Consolidating Balance Sheets [Text Block]	Condensed Consolidating Balance Sheets September 30, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 1,164 $ 4,238 $ — $ 19,177 $ — $ 24,579 Receivables, net — 82 — 164,686 — 164,768 Inventories — 1,875 6,822 16,064 — 24,761 Other current assets 122 16,961 1,284 44,399 — 62,766 Intercompany receivable 187,967 2,726,465 — — (2,914,432 ) — Total current assets 189,253 2,749,621 8,106 244,326 (2,914,432 ) 276,874 Property, plant and equipment, net — 1,846,330 619,284 2,019,234 — 4,484,848 Intangible assets, net — 51,463 — 694,449 — 745,912 Goodwill — 149,453 170,652 774,556 — 1,094,661 Investment in wholly owned subsidiaries 2,793,521 29,961 1,450,865 849,825 (5,124,172 ) — Other long-term assets, net 303 77,144 26,861 14,355 — 118,663 Total assets $ 2,983,077 $ 4,903,972 $ 2,275,768 $ 4,596,745 $ (8,038,604 ) $ 6,720,958 Liabilities, Mezzanine Equity and Partners’ Equity Accounts payable $ 13,636 $ 26,423 $ 5,935 $ 108,218 $ — $ 154,212 Short-term debt — 10,500 — — — 10,500 Accrued interest payable — 30,785 — 60 — 30,845 Accrued liabilities 929 16,608 7,971 71,790 — 97,298 Taxes other than income tax 63 7,152 5,893 6,587 — 19,695 Income tax payable — 364 — 4,212 — 4,576 Intercompany payable — — 1,393,208 1,521,224 (2,914,432 ) — Total current liabilities 14,628 91,832 1,413,007 1,712,091 (2,914,432 ) 317,126 Long-term debt, less current portion — 3,313,528 — 63,324 — 3,376,852 Deferred income tax liability — 1,262 12 22,069 — 23,343 Other long-term liabilities — 45,099 13,124 38,688 — 96,911 Series D preferred units 559,844 — — — — 559,844 Total partners’ equity 2,408,605 1,452,251 849,625 2,760,573 (5,124,172 ) 2,346,882 Total liabilities, mezzanine equity and partners’ equity $ 2,983,077 $ 4,903,972 $ 2,275,768 $ 4,596,745 $ (8,038,604 ) $ 6,720,958 Condensed Consolidating Balance Sheets December 31, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Assets Cash and cash equivalents $ 885 $ 29 $ — $ 23,378 $ — $ 24,292 Receivables, net — 280 — 176,495 — 176,775 Inventories — 1,686 8,611 16,560 — 26,857 Other current assets 61 11,412 4,191 6,844 — 22,508 Intercompany receivable — 3,112,164 — — (3,112,164 ) — Total current assets 946 3,125,571 12,802 223,277 (3,112,164 ) 250,432 Property, plant and equipment, net — 1,893,720 591,070 1,816,143 — 4,300,933 Intangible assets, net — 58,530 — 725,949 — 784,479 Goodwill — 149,453 170,652 777,370 — 1,097,475 Investment in wholly owned subsidiaries 2,891,371 24,162 1,301,717 790,882 (5,008,132 ) — Deferred income tax asset — — — 233 — 233 Other long-term assets, net 303 65,684 27,493 8,201 — 101,681 Total assets $ 2,892,620 $ 5,317,120 $ 2,103,734 $ 4,342,055 $ (8,120,296 ) $ 6,535,233 Liabilities and Partners’ Equity Accounts payable $ 4,078 $ 27,642 $ 13,160 $ 101,052 $ — $ 145,932 Short-term debt — 35,000 — — — 35,000 Current portion of long-term debt — 349,990 — — — 349,990 Accrued interest payable — 40,402 — 47 — 40,449 Accrued liabilities 1,105 17,628 9,450 33,395 — 61,578 Taxes other than income tax 125 7,110 3,794 3,356 — 14,385 Income tax payable — 732 4 3,436 — 4,172 Intercompany payable 322,296 — 1,277,691 1,512,177 (3,112,164 ) — Total current liabilities 327,604 478,504 1,304,099 1,653,463 (3,112,164 ) 651,506 Long-term debt, less current portion — 3,201,220 — 61,849 — 3,263,069 Deferred income tax liability — 1,262 12 20,998 — 22,272 Other long-term liabilities — 58,806 8,861 50,630 — 118,297 Total partners’ equity 2,565,016 1,577,328 790,762 2,555,115 (5,008,132 ) 2,480,089 Total liabilities and partners’ equity $ 2,892,620 $ 5,317,120 $ 2,103,734 $ 4,342,055 $ (8,120,296 ) $ 6,535,233
Condensed Consolidating Statements of Comprehensive Income (Loss) [Table Text Block]	Condensed Consolidating Statements of Comprehensive Income For the Three Months Ended September 30, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 127,165 $ 62,981 $ 300,323 $ (106 ) $ 490,363 Costs and expenses 600 76,932 40,497 277,163 (106 ) 395,086 Operating (loss) income (600 ) 50,233 22,484 23,160 — 95,277 Equity in earnings of subsidiaries 48,668 9,405 13,884 34,607 (106,564 ) — Interest income (expense), net 68 (45,532 ) (1,882 ) 2,521 — (44,825 ) Other income, net — 468 119 333 — 920 Income before income tax expense 48,136 14,574 34,605 60,621 (106,564 ) 51,372 Income tax expense — 82 — 3,154 — 3,236 Net income $ 48,136 $ 14,492 $ 34,605 $ 57,467 $ (106,564 ) $ 48,136 Comprehensive income $ 48,136 $ 19,751 $ 34,605 $ 57,109 $ (106,564 ) $ 53,037 Condensed Consolidating Statements of Comprehensive Income (Loss) For the Three Months Ended September 30, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 127,980 $ 58,871 $ 253,854 $ (139 ) $ 440,566 Costs and expenses 332 77,668 38,709 232,279 (139 ) 348,849 Operating (loss) income (332 ) 50,312 20,162 21,575 — 91,717 Equity in earnings (loss) of subsidiaries 38,896 (4,558 ) 20,809 39,508 (94,655 ) — Interest income (expense), net 28 (46,247 ) (1,455 ) 2,418 — (45,256 ) Other income (expense), net — 57 (8 ) (5,175 ) — (5,126 ) Income (loss) before income tax expense 38,592 (436 ) 39,508 58,326 (94,655 ) 41,335 Income tax expense — 115 1 2,627 — 2,743 Net income (loss) $ 38,592 $ (551 ) $ 39,507 $ 55,699 $ (94,655 ) $ 38,592 Comprehensive income (loss) $ 38,592 $ (1,031 ) $ 39,507 $ 62,069 $ (94,655 ) $ 44,482 Condensed Consolidating Statements of Comprehensive Income For the Nine Months Ended September 30, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 364,721 $ 185,760 $ 902,422 $ (455 ) $ 1,452,448 Costs and expenses 1,750 235,936 118,002 823,620 (455 ) 1,178,853 Operating (loss) income (1,750 ) 128,785 67,758 78,802 — 273,595 Equity in earnings of subsidiaries 205,281 8,848 149,032 211,919 (575,080 ) — Interest income (expense), net 137 (145,915 ) (5,177 ) 9,422 — (141,533 ) Other income, net — 2,792 307 78,985 — 82,084 Income (loss) before income tax expense 203,668 (5,490 ) 211,920 379,128 (575,080 ) 214,146 Income tax expense — 313 1 10,164 — 10,478 Net income (loss) $ 203,668 $ (5,803 ) $ 211,919 $ 368,964 $ (575,080 ) $ 203,668 Comprehensive income $ 203,668 $ 24,535 $ 211,919 $ 361,830 $ (575,080 ) $ 226,872 Condensed Consolidating Statements of Comprehensive Income (Loss) For the Nine Months Ended September 30, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ 380,504 $ 161,689 $ 822,064 $ (773 ) $ 1,363,484 Costs and expenses 1,327 237,086 106,296 757,288 (773 ) 1,101,224 Operating (loss) income (1,327 ) 143,418 55,393 64,776 — 262,260 Equity in earnings (loss) of 124,073 (10,625 ) 69,770 121,002 (304,220 ) — Interest income (expense), net 36 (129,551 ) (4,160 ) 6,393 — (127,282 ) Other income (expense), net — 140 1 (5,039 ) — (4,898 ) Income before income tax expense 122,782 3,382 121,004 187,132 (304,220 ) 130,080 Income tax expense — 81 3 7,214 — 7,298 Net income $ 122,782 $ 3,301 $ 121,001 $ 179,918 $ (304,220 ) $ 122,782 Comprehensive income (loss) $ 122,782 $ (1,592 ) $ 121,001 $ 195,595 $ (304,220 ) $ 133,566
Condensed Consolidating Statements of Cash Flows [Text Block]	Condensed Consolidating Statements of Cash Flows For the Nine Months Ended September 30, 2018 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 296,475 $ 60,254 $ 90,482 $ 361,320 $ (445,211 ) $ 363,320 Cash flows from investing activities: Capital expenditures — (32,270 ) (14,002 ) (292,168 ) — (338,440 ) Change in accounts payable related to capital expenditures — 2,063 (6,209 ) (14,484 ) — (18,630 ) Proceeds from sale or disposition of assets — 1,464 20 736 — 2,220 Proceeds from insurance recoveries — — — 78,419 — 78,419 Acquisitions — — (37,502 ) — — (37,502 ) Investment in other long-term — — — (3,280 ) — (3,280 ) Net cash used in investing activities — (28,743 ) (57,693 ) (230,777 ) — (317,213 ) Cash flows from financing activities: Debt borrowings — 1,498,853 — 25,100 — 1,523,953 Debt repayments — (1,754,798 ) — (23,700 ) — (1,778,498 ) Issuance of Series D preferred units 590,000 — — — — 590,000 Payment of issuance costs for Series D preferred units (34,187 ) — — — — (34,187 ) Issuance of common units 10,000 — — — — 10,000 General partner contribution 204 — — — — 204 Distributions to preferred unitholders (60,249 ) (30,123 ) (30,124 ) (30,123 ) 90,372 (60,247 ) Distributions to common unitholders and general partner (236,549 ) (118,275 ) (118,274 ) (118,290 ) 354,839 (236,549 ) Cash consideration for Merger (Note 2) (61,411 ) — — 140 — (61,271 ) Proceeds from termination of interest rate swaps — 8,048 — — — 8,048 Net intercompany activity (501,574 ) 373,055 115,609 12,910 — — Other, net (2,430 ) (4,062 ) — (62 ) — (6,554 ) Net cash used in financing activities (296,196 ) (27,302 ) (32,789 ) (134,025 ) 445,211 (45,101 ) Effect of foreign exchange rate changes on cash — — — (719 ) — (719 ) Net increase (decrease) in cash and cash equivalents 279 4,209 — (4,201 ) — 287 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 $ 1,164 $ 4,238 $ — $ 19,177 $ — $ 24,579 Condensed Consolidating Statements of Cash Flows For the Nine Months Ended September 30, 2017 (Thousands of Dollars) NuStar Energy NuStar Logistics NuPOP Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by operating activities $ 355,864 $ 128,395 $ 72,711 $ 290,917 $ (536,872 ) $ 311,015 Cash flows from investing activities: Capital expenditures — (34,964 ) (18,138 ) (167,515 ) — (220,617 ) Change in accounts payable related to capital expenditures — (1,223 ) 4,445 10,050 — 13,272 Proceeds from sale or disposition of assets — 1,947 17 59 — 2,023 Investment in subsidiaries (1,262,000 ) — — (126 ) 1,262,126 — Proceeds from Axeon term loan — 110,000 — — — 110,000 Acquisitions — — — (1,461,719 ) — (1,461,719 ) Net cash (used in) provided by investing activities (1,262,000 ) 75,760 (13,676 ) (1,619,251 ) 1,262,126 (1,557,041 ) Cash flows from financing activities: Debt borrowings — 1,901,504 — 69,700 — 1,971,204 Debt repayments — (1,856,739 ) — (82,000 ) — (1,938,739 ) Note offering, net of issuance costs — 543,313 — — — 543,313 Issuance of other preferred units, net of issuance costs 371,802 — — — — 371,802 Issuance of common units, net of issuance costs 643,858 — — — — 643,858 General partner contribution 13,597 — — — — 13,597 Distributions to preferred unitholders (26,681 ) (13,340 ) (13,341 ) (13,342 ) 40,023 (26,681 ) Distributions to common unitholders and general partner (331,222 ) (165,611 ) (165,611 ) (165,627 ) 496,849 (331,222 ) Contributions from affiliates — 1,262,000 — 126 (1,262,126 ) — Net intercompany activity 238,172 (1,873,773 ) 119,917 1,515,684 — — Other, net (3,366 ) (1,486 ) — (218 ) — (5,070 ) Net cash provided by (used) in financing activities 906,160 (204,132 ) (59,035 ) 1,324,323 (725,254 ) 1,242,062 Effect of foreign exchange rate changes on cash — — — 1,637 — 1,637 Net increase (decrease) in cash and cash equivalents 24 23 — (2,374 ) — (2,327 ) Cash and cash equivalents as of the beginning of the period 870 5 — 35,067 — 35,942 Cash and cash equivalents as of the end of the period $ 894 $ 28 $ — $ 32,693 $ — $ 33,615

ORGANIZATION AND BASIS OF PRE_2

ORGANIZATION AND BASIS OF PRESENTATION Narrative 1 (Details) $ / shares in Units, $ in Thousands	Jul. 13, 2018USD ($)$ / sharesshares	Jun. 29, 2018USD ($)$ / sharesshares	Apr. 18, 2017shares	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Jul. 20, 2018Rate
Organization and Operations [Abstract]
Number of business segments					3
Common unit conversion rate | Rate						55.00%
Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Net proceeds from issuance of Series D preferred units | $	$ 185,100	$ 370,700		$ 185,102	$ 555,813
Units issued, price per unit | $ / shares	$ 25.38	$ 25.38
Issuance of preferred units (temporary equity) (in units) | shares	7,486,209	15,760,441
Common Limited Partner [Member]
Class of Stock [Line Items]
Units issued, price per unit | $ / shares		$ 24.17
Issuance of units (permanent equity) (in units) | shares		413,736	14,375,000

ORGANIZATION AND BASIS OF PRE_3

ORGANIZATION AND BASIS OF PRESENTATION Narrative 2 (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2018	Mar. 31, 2018
Unusual or Infrequent Item, or Both [Line Items]
Insurance proceeds	$ 87.5
Business Interruption Loss From Hurricane [Member]
Unusual or Infrequent Item, or Both [Line Items]
Insurance proceeds	$ 9.1
Other Nonoperating Income (Expense) [Member]
Unusual or Infrequent Item, or Both [Line Items]
Loss to common unitholders attributable to the Merger		$ 78.8

MERGER Narrative (Details)

MERGER Narrative (Details) - shares	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Jul. 20, 2018
Class of Stock [Line Items]
General partner ownership interest		2.00%
Common unit conversion rate			55.00%
Number of common limited partner units owned by general partner		10,214,626
Common Limited Partner [Member]
Class of Stock [Line Items]
Issuance of NuStar Energy common units as a result of the Merger, units issued	23,600,000
Issuance of NuStar Energy common units as a result of the Merger, incremental units issued	13,400,000

MERGER Table - Merger Calculati

MERGER Table - Merger Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 20, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Business Combinations [Abstract]
Fair value of incremental NS common units issued	$ 335,106
NSH debt and net current liabilities assumed	52,075
Transaction costs, including accrued costs	15,897
Total consideration	403,078
Carrying value of general partner interest	$ 25,999	$ 0		$ 0		$ 37,826
Loss to common unitholders attributable to the Merger		$ 377,079	$ 0	$ (377,079)	$ 0
Basic weighted-average common units outstanding		104,264,796	93,031,320	96,920,202	87,392,597
Loss per common unit attributable to the Merger		$ (3.62)

MERGER Organizational structure

MERGER Organizational structure before the Merger (Details)	2 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018
NuPOP | NuStar Energy
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%	100.00%
NuStar Logistics | NuStar Energy
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%	100.00%
Riverwalk Logistics, L.P. [Member] | NuStar GP, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	0.10%	0.10%
Riverwalk Logistics, L.P. [Member] | Riverwalk Holdings, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	99.90%	99.90%
NuStar Energy | Public Unitholders [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common unitholders ownership interest	100.00%	89.00%
NuStar Energy | NuStar GP, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest		0.001%
NuStar Energy | Riverwalk Holdings, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest		11.00%
NuStar GP, LLC [Member] | Nustar GP Holdings, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%
Riverwalk Holdings, LLC [Member] | Nustar GP Holdings, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%

MERGER Organizational structu_2

MERGER Organizational structure after the Merger (Details)	2 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018
Riverwalk Logistics, L.P. [Member] | NuStar GP, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	0.10%	0.10%
Riverwalk Logistics, L.P. [Member] | Riverwalk Holdings, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	99.90%	99.90%
Riverwalk Holdings, LLC [Member] | Nustar GP Holdings, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%
NuStar GP, LLC [Member] | Nustar GP Holdings, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%
NuPOP | NuStar Energy
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%	100.00%
Nustar GP Holdings, LLC [Member] | NuStar Energy
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%
NuStar Logistics | NuStar Energy
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%	100.00%
NuStar Energy | Public Unitholders [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common unitholders ownership interest	100.00%	89.00%
NuStar Energy | NuStar GP, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest		0.001%
NuStar Energy | Riverwalk Holdings, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest		11.00%

ACQUISITIONS Narrative 1 (Detai

ACQUISITIONS Narrative 1 (Details) - CHS Acquisition [Member] $ in Millions	Apr. 16, 2018USD ($)
Business Acquisition [Line Items]
Purchase price of CHS Acquisition	$ 37.5
Description of CHS Acquisition	On April 16, 2018, we acquired CHS Inc.’s Council Bluffs pipeline system, comprised of a 227-mile pipeline and 18 storage tanks,

ACQUISITIONS Narrative 2 (Detai

ACQUISITIONS Narrative 2 (Details) $ in Billions	May 04, 2017USD ($)
Navigator Acquisition [Member]
Business Acquisition [Line Items]
Purchase price of Navigator Acquisition	$ 1.5

ACQUISITIONS Table 1 - Navigato

ACQUISITIONS Table 1 - Navigator Acquisition Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands	May 04, 2017	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 1,094,661	$ 1,097,475
Navigator Acquisition [Member]
Business Acquisition [Line Items]
Accounts receivable	$ 4,747
Other current assets	2,359
Property, plant and equipment, net	376,690
Intangible assets	700,000
Goodwill	398,024
Other long-term assets, net	2,199
Current liabilities	(22,300)
Purchase price allocation, net of cash acquired	$ 1,461,719
Intangible assets, weighted average useful life (years)	20 years

ACQUISITIONS Narrative 3 (Detai

ACQUISITIONS Narrative 3 (Details) - USD ($) $ in Thousands	Jun. 29, 2018	Apr. 28, 2017	Apr. 18, 2017	Jun. 30, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Net proceeds from issuance of units					$ 10,204
General partner ownership interest				2.00%
Common Limited Partner [Member]
Business Acquisition [Line Items]
Issuance of units (permanent equity) (in units)	413,736		14,375,000
General Partner [Member]
Business Acquisition [Line Items]
Net proceeds from issuance of units			$ 13,600
General partner ownership interest				2.00%
Series B Preferred Limited Partner [Member]
Business Acquisition [Line Items]
Issuance of units (permanent equity) (in units)		15,400,000
Logistics Notes Due 2027 [Member]
Business Acquisition [Line Items]
Senior notes issued		$ 550,000
Stated interest rate		5.625%

ACQUISITIONS Table 2 - Navigato

ACQUISITIONS Table 2 - Navigator Pro Forma Information (Details) - Navigator Acquisition [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)$ / shares
Business Acquisition [Line Items]
Revenues	$ 1,377,883
Net income	$ 102,251
Basic net income per common unit | $ / shares	$ 0.31

ACQUISITIONS Narrative 4 (Detai

ACQUISITIONS Narrative 4 (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Navigator Acquisition [Member]
Business Acquisition [Line Items]
Business acquisition, transaction costs	$ 14

DEBT Narrative (Details)

DEBT Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Feb. 28, 2018	Sep. 30, 2018	Dec. 28, 2018	Apr. 15, 2018	Mar. 31, 2018	Jan. 14, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt		$ 3,376,852					$ 3,613,059
Logistics revolving credit agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,575,000			$ 1,750,000
Covenant terms		a minimum consolidated interest coverage ratio (as defined in the Revolving Credit Agreement), which must not be less than 1.75-to-1.00 for each rolling period of four quarters, beginning with the rolling period ending June 30, 2018; the maximum allowed consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) to 5.25-to-1.00 for the rolling periods ending June 30, 2018 through December 31, 2018. For any rolling periods ending on or after March 31, 2019, the maximum allowed consolidated debt coverage ratio may not exceed 5.00-to-1.00.
Current remaining borrowing capacity		$ 563,900
Interest rate increase	0.25%
Interest rate at period end - Revolving Credit Agreement		4.00%
Long-term debt		$ 1,000,000
Logistics Notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate increase	0.25%
Long-term debt					$ 350,000
Stated interest rate				7.65%
Interest rate at period end				8.65%
Logisitics Notes due 2043 [Member]
Debt Instrument [Line Items]
Long-term debt		$ 402,500
Stated interest rate						7.625%
Interest rate at period end		9.10%
Interest rate terms		an annual rate equal to the sum of the three-month LIBOR for the related quarterly interest period, plus 6.734% payable quarterly, commencing with the interest payment due April 15, 2018.
Receivables Financing Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 125,000
Long-term debt		$ 63,700
Weighted average interest rate		3.10%
Collateral amount		$ 104,900
Scenario, Forecast [Member] | Logistics revolving credit agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,400,000

COMMITMENTS AND CONTINGENCIES N

COMMITMENTS AND CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Loss contingency accrual, at carrying value	$ 2.9	$ 7.3

FAIR VALUE MEASUREMENTS Table 1

FAIR VALUE MEASUREMENTS Table 1 - Recurring Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Liabilities:
Total liabilities		$ (12,400)
Fair Value Level 1
Liabilities:
Total liabilities		(2,412)
Fair Value Level 2
Liabilities:
Total liabilities		(9,988)
Fair Value Level 3
Liabilities:
Total liabilities		0
Other current assets
Assets:
Product imbalances - asset		3,890
Other current assets | Fair Value Level 1
Assets:
Product imbalances - asset		3,890
Other current assets | Fair Value Level 2
Assets:
Product imbalances - asset		0
Other current assets | Fair Value Level 3
Assets:
Product imbalances - asset		0
Other long-term assets, net
Assets:
Interest rate swaps - assets	$ 8,031
Other long-term assets, net | Fair Value Level 1
Assets:
Interest rate swaps - assets	0
Other long-term assets, net | Fair Value Level 2
Assets:
Interest rate swaps - assets	8,031
Other long-term assets, net | Fair Value Level 3
Assets:
Interest rate swaps - assets	0
Accrued liabilities
Liabilities:
Product imbalances - liability		(1,534)
Commodity derivatives - liabilities	(276)	(878)
Interest rate swaps - liabilities		(5,394)
Accrued liabilities | Fair Value Level 1
Liabilities:
Product imbalances - liability		(1,534)
Commodity derivatives - liabilities	(276)	(878)
Interest rate swaps - liabilities		0
Accrued liabilities | Fair Value Level 2
Liabilities:
Product imbalances - liability		0
Commodity derivatives - liabilities	0	0
Interest rate swaps - liabilities		(5,394)
Accrued liabilities | Fair Value Level 3
Liabilities:
Product imbalances - liability		0
Commodity derivatives - liabilities	$ 0	0
Interest rate swaps - liabilities		0
Other long-term liabilities
Liabilities:
Interest rate swaps - liabilities		(4,594)
Other long-term liabilities | Fair Value Level 1
Liabilities:
Interest rate swaps - liabilities		0
Other long-term liabilities | Fair Value Level 2
Liabilities:
Interest rate swaps - liabilities		(4,594)
Other long-term liabilities | Fair Value Level 3
Liabilities:
Interest rate swaps - liabilities		$ 0

FAIR VALUE MEASUREMENTS Table 2

FAIR VALUE MEASUREMENTS Table 2 - Estimated Fair Values and Carrying Amounts of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair value, long-term debt	$ 3,409,199	$ 3,677,622
Carrying amount, long-term debt	$ 3,376,852	$ 3,613,059

DERIVATIVES AND RISK MANAGEME_3

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Narrative (Details) bbl in Millions	Sep. 30, 2018USD ($)bbl	Dec. 31, 2017USD ($)bbl	Apr. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Apr. 15, 2018
Derivative [Line Items]
Cash received from termination of interest rate swaps			$ 8,000,000
Number of forecasted interest payments probable not to occur				1
Loss due to forecasted interest payment probable not to occur				$ 300,000
Margin deposit	$ 400,000	$ 300,000		400,000	$ 400,000
Interest rate swaps | Cash Flow Hedges
Derivative [Line Items]
Interest rate swaps interest rate received					receive a rate based on the three-month USD LIBOR
Notional amount of forward-starting interest rate swaps	$ 250,000,000	$ 600,000,000		$ 250,000,000	$ 250,000,000
Notional amount of forward-starting interest rate swaps terminated			$ 350,000,000
Commodity contracts
Derivative [Line Items]
Notional amount of commodity contracts, volume (in barrels) | bbl	0.2	1.2
Logistics Notes due 2018 [Member]
Derivative [Line Items]
Stated interest rate						7.65%

DERIVATIVES AND RISK MANAGEME_4

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 1 - Fair Values of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value
Asset Derivatives	$ 8,064	$ 742
Liability Derivatives	(309)	(11,608)
Designated as Hedging Instruments
Derivatives, Fair Value
Asset Derivatives	8,059	0
Liability Derivatives	(296)	(10,100)
Designated as Hedging Instruments | Commodity contracts | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	28	0
Liability Derivatives	(296)	(112)
Designated as Hedging Instruments | Interest rate swaps | Other long-term assets, net
Derivatives, Fair Value
Asset Derivatives	8,031	0
Liability Derivatives	0	0
Designated as Hedging Instruments | Interest rate swaps | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	0	(5,394)
Designated as Hedging Instruments | Interest rate swaps | Other long-term liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	0	(4,594)
Not Designated as Hedging Instruments | Commodity contracts | Accrued liabilities
Derivatives, Fair Value
Asset Derivatives	5	742
Liability Derivatives	$ (13)	$ (1,508)

DERIVATIVES AND RISK MANAGEME_5

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 2 - Derivative Instruments Eligible for Offset (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Commodity contracts
Derivative Assets and Liabilities Eligible for Offset, Net [Line Items]
Net amounts of liabilities presented in the consolidated balance sheets	$ (276)	$ (878)

DERIVATIVES AND RISK MANAGEME_6

DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 3 - Impact of Derivatives on Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss)
Gain (loss) to be reclassified during next 12 months, forward-starting interest rate swaps	$ (4,000)		$ (4,000)
Designated as Hedging Instruments | Fair Value Hedges | Commodity contracts | Cost of product sales
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income on derivative	(294)	$ (1,134)	(1,597)	$ 1,327
Gain (loss) recognized in income on hedged item	(221)	1,111	997	(1,036)
Gain (loss) recognized in income for ineffective portion	(515)	(23)	(600)	291
Designated as Hedging Instruments | Cash Flow Hedges | Interest rate swaps | Other comprehensive income
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in other comprehensive income on derivative (effective portion)	3,540	(2,064)	26,067	(10,005)
Designated as Hedging Instruments | Cash Flow Hedges | Interest rate swaps | Interest expense, net
Derivative Instruments, Gain (Loss)
Gain (loss) reclassified from AOCI into interest expense, net (effective portion)	(1,719)	(1,584)	(4,271)	(5,112)
Not Designated as Hedging Instruments | Commodity contracts | Cost of product sales
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income on derivative	$ (209)	$ (132)	$ (439)	$ (218)

RELATED PARTY TRANSACTIONS Narr

RELATED PARTY TRANSACTIONS Narrative (Details)	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Administrative fees, description	(the Amended GP Services Agreement), which provided that we furnish administrative services necessary to conduct the business of NuStar GP Holdings, and NuStar GP Holdings compensated us for these services for an annual fee of $1.0 million, subject to adjustment. We terminated the Amended GP Services Agreement in conjunction with the Merger.

EMPLOYEE BENEFIT PLANS Narrativ

EMPLOYEE BENEFIT PLANS Narrative (Details) $ in Millions	1 Months Ended
	Sep. 30, 2018USD ($)
Retirement Benefits [Abstract]
Pension Plan contribution	$ 11

EMPLOYEE BENEFIT PLANS Table -

EMPLOYEE BENEFIT PLANS Table - Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,405	$ 2,239	$ 7,216	$ 6,717
Interest cost	1,206	1,127	3,618	3,381
Expected return on assets	(1,854)	(1,603)	(5,563)	(4,808)
Amortization of prior service credit	(515)	(515)	(1,543)	(1,546)
Amortization of net loss	544	371	1,631	1,113
Net periodic benefit cost (income)	1,786	1,619	5,359	4,857
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	126	115	378	341
Interest cost	107	107	322	323
Expected return on assets	0	0	0	0
Amortization of prior service credit	(286)	(286)	(859)	(858)
Amortization of net loss	53	47	160	143
Net periodic benefit cost (income)	$ 0	$ (17)	$ 1	$ (51)

SERIES D CUMULATIVE CONVERTIB_3

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 20, 2018	Jul. 13, 2018	Jun. 29, 2018	Jul. 13, 2018	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Class of Stock [Line Items]
Proceeds from issuance of Series D preferred units							$ 590,000	$ 0
Series D preferred units outstanding						23,246,650	23,246,650		0
Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Proceeds from issuance of Series D preferred units		$ 190,000	$ 400,000				$ 590,000
Series D preferred units outstanding						23,246,650	23,246,650
Issuance of preferred units (temporary equity) (in units)		7,486,209	15,760,441	7,486,209
Units issued, price per unit		$ 25.38	$ 25.38	$ 25.38
Net proceeds from issuance of Series D preferred units		$ 185,100	$ 370,700			$ 185,102	$ 555,813
Transaction fee percentage			3.50%
Transaction fee			$ 20,700
Equity issuance costs				$ 13,500
Unpaid dividend penalty, per unit dividend increase							$ 0.048
Unpaid dividend penalty, preferred stock, conversion basis							each holder of the Series D Preferred Units may elect to convert its Series D Preferred Units into common units on a one-for-one basis, plus any unpaid Series D distributions
Unpaid dividend penalty, minimum amount of acquisitions or asset sales requiring consent							$ 50,000
Distribution payment date						Sep. 17, 2018
Distribution date of record						Sep. 4, 2018
Convertible preferred units, terms of redemption							The Partnership may redeem all or any portion of the Series D Preferred Units, in an amount not less than $50.0 million for cash at a redemption price equal to, as applicable: (i) $31.73 per Series D Preferred Unit at any time on or after June 29, 2023 but prior to June 29, 2024; (ii) $30.46 per Series D Preferred Unit at any time on or after June 29, 2024 but prior to June 29, 2025; (iii) $29.19 per Series D Preferred Unit at any time on or after June 29, 2025; plus, in each case, the sum of any unpaid distributions on the applicable Series D Preferred Unit plus the distributions prorated for the number of days elapsed (not to exceed 90) in the period of redemption (Series D Partial Period Distributions). The holders have the option to convert the units prior to such redemption as discussed above. Additionally, at any time on or after June 29, 2028, each holder of Series D Preferred Units will have the right to require the Partnership to redeem all of the Series D Preferred Units held by such holder at a redemption price equal to $29.19 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions. If a holder of Series D Preferred Units exercises its redemption right, the Partnership may elect to pay up to 50% of such amount in common units (which shall be valued at 93% of a volume-weighted average trading price of the common units); provided, that the common units to be issued do not, in the aggregate, exceed 15% of NuStar Energy’s common equity market capitalization at the time.
Maximum number of days within partial distribution period							90
Convertible preferred Stock, terms of conversion, change of control							convert its Series D Preferred Units into common units on a one-for-one basis, plus any unpaid Series D distributions
Change of control redemption amount							the sum of (a) $29.82 per Series D Preferred Unit plus (b) any unpaid Series D distributions plus (c) the applicable distribution amount for the distribution periods ending after the change of control event and prior to (but including) the fourth anniversary of the Initial Closing
Temporary equity, accounting treatment							The Series D Preferred Units include redemption provisions at the option of the holders of the Series D Preferred Units and upon a Series D Change of Control (as defined in the partnership agreement), which are outside the Partnership’s control. Therefore, the Series D Preferred Units are presented in the mezzanine section of the consolidated balance sheets. The Series D Preferred Units have been recorded at their issuance date fair value, net of issuance costs. We reassess the presentation of the Series D Preferred Units in our consolidated balance sheets on a quarterly basis. The Series D Preferred Units are subject to accretion from their carrying value at the issuance date to the redemption value, which is based on the redemption right of the Series D Preferred Unit holders that may be exercised at any time on or after June 29, 2028, using the effective interest method over a period of ten years. In the calculation of net income per unit, the accretion will be treated in the same manner as a distribution and deducted from net income to arrive at net income attributable to common units.
Accretion period	10 years
Preferred Stock, Distributions, Period - June 29, 2018 to June 28, 2020 [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units distribution percentage							9.75%
Preferred Stock, Distributions, Period - June 29, 2020 to June 28, 2023 [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units distribution percentage							10.75%
Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units, dividend payment rate, variable							the greater of 13.75% per annum or the common unit distribution rate thereafter
Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member] | Minimum [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units distribution percentage							13.75%
Preferred Stock, Distributions, Period - June 29, 2018 to June 15, 2019 [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Maximim percentage of distributions that may be paid in additional units							50.00%
Preferred Stock Distributions, Period - June 16, 2019 and thereafter [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Required amount of per unit cash dividends to permit dividend paid in kind							$ 0.635
Preferred Stock, Issuer Redemption, Period - June 29, 2023 to June 28, 2024 [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Temporary equity redemption price per unit							$31.73 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions
Preferred Stock, Issuer Redemption, Period - June 29, 2023 and thereafter [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Minimum redemption amount							$ 50,000
Preferred Stock, Issuer Redemption, Period - June 29, 2024 to June 28, 2025 [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Temporary equity redemption price per unit							$30.46 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions
Preferred Stock, Issuer Redemption, Period - June 29, 2025 and thereafter [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Temporary equity redemption price per unit							$29.19 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions
Preferred Stock, Holder Redemption, Period - June 29, 2028 and thereafter [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Temporary equity redemption price per unit							$29.19 per Series D Preferred Unit plus any unpaid Series D distributions plus the Series D Partial Period Distributions
Percentage of redemption amount that may be paid in common limited partner units							50.00%
Volume-weighted average trading price percentage of common limited partner units							93.00%
Common limited partners' equity market capitalization, maximum allowable percentage							15.00%
Preferred Stock, Conversion, Period - June 29, 2020 and thereafter [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Convertible preferred units, terms of conversion							At any time on or after June 29, 2020, each holder of Series D Preferred Units may convert all or any portion of its Series D Preferred Units into common units on a one-for-one basis (plus any unpaid Series D distributions), subject to anti-dilution adjustments, at any time, but not more than once per quarter, so long as any conversion is for at least $50.0 million based on the Series D Preferred Unit Purchase Price (or such lesser amount representing all of a holder’s Series D Preferred Units).
Minimum conversion amount							$ 50,000
Equity Issuance Date, June 29, 2018 [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred unit distribution declared						$ 0.525
Equity Issuance Date, July 13, 2018 [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred unit distribution declared						$ 0.431
Subsequent Event [Member] | Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred unit distribution declared					$ 0.619
Distribution payment date					Dec. 17, 2018
Distribution date of record					Dec. 3, 2018

SERIES D CUMULATIVE CONVERTIB_4

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Table (Details) - USD ($) $ in Thousands	Jul. 13, 2018	Jun. 29, 2018	Sep. 30, 2018	Sep. 30, 2018
Temporary Equity [Line Items]
Beginning balance			$ 370,711	$ 0
Ending balance			559,844	559,844
Series D Preferred Limited Partner [Member]
Temporary Equity [Line Items]
Net income			13,848	14,060
Distributions to partners			(13,848)	(14,060)
Issuance of units	$ 185,100	$ 370,700	185,102	555,813
Series D Preferred Unit accretion			$ 4,031	$ 4,031

PARTNERS' EQUITY Narrative 1 (D

PARTNERS' EQUITY Narrative 1 (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 29, 2018	Apr. 18, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Class of Stock [Line Items]
Contributions from general partner				$ 204	$ 13,597
General partner ownership interest			2.00%
Common Limited Partner [Member]
Class of Stock [Line Items]
Issuance of units (units)	413,736	14,375,000
Units issued, price per unit	$ 24.17
Proceeds from issuance of common limited partner units	$ 10,200
General Partner [Member]
Class of Stock [Line Items]
Contributions from general partner				$ 200
General partner ownership interest			2.00%

PARTNERS' EQUITY Table 1 - Chan

PARTNERS' EQUITY Table 1 - Changes to Partners' Equity, excluding the Carrying Value of the Series D Preferred Units (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance as of January 1, 2018			$ 2,480,089
Net income			189,608
Unit-based compensation			6,559
Other comprehensive income			23,204
Distributions to partners			(284,605)
Issuance of units, including contribution from general partner			10,204
Adjustments related to the Merger (refer to Note 2 for discussion)			(67,972)
Series D Preferred Unit accretion (refer to Note 11 for discussion)	$ (4,031)	$ 0	(4,031)	$ 0
Other			(6,174)
Balance as of September 30, 2018	$ 2,346,882		$ 2,346,882

PARTNERS' EQUITY Narrative 2 (D

PARTNERS' EQUITY Narrative 2 (Details)	9 Months Ended
	Sep. 30, 2018
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 2 - Gene

PARTNERS' EQUITY Table 2 - General Partner Incentive Distributions prior to the Merger (Details)	6 Months Ended
	Jun. 30, 2018
General Partner Including Incentive Distributions [Member] | Quarterly Distributions Level 1 [Member]
Distribution Allocation [Line Items]
Percentage of distribution allocated to the general partner	2.00%
General Partner Including Incentive Distributions [Member] | Quarterly Distributions Level 2 [Member]
Distribution Allocation [Line Items]
Percentage of distribution allocated to the general partner	10.00%
General Partner Including Incentive Distributions [Member] | Quarterly Distributions Level 3 [Member]
Distribution Allocation [Line Items]
Percentage of distribution allocated to the general partner	25.00%
Common Limited Partner [Member] | Quarterly Distributions Level 1 [Member]
Distribution Allocation [Line Items]
Quarterly distribution amount per common unit	Up to $0.60
Percentage of distribution allocated to common limited partners	98.00%
Common Limited Partner [Member] | Quarterly Distributions Level 2 [Member]
Distribution Allocation [Line Items]
Quarterly distribution amount per common unit	Above $0.60 up to $0.66
Percentage of distribution allocated to common limited partners	90.00%
Common Limited Partner [Member] | Quarterly Distributions Level 3 [Member]
Distribution Allocation [Line Items]
Quarterly distribution amount per common unit	$0.66
Percentage of distribution allocated to common limited partners	75.00%

PARTNERS' EQUITY Table 3 - Cash

PARTNERS' EQUITY Table 3 - Cash Distributions Earned - General and Common Limited Partners (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Distributions Made to Limited Partners and General Partner [Line Items]
General partner interest	$ 0				$ 2,302	$ 1,141	$ 6,947
General partner incentive distribution	0				10,912	0	34,736
Total general partner distribution	0				13,214	1,141	41,683
Common limited partners’ distribution	64,248				101,870	184,369	305,652
Total cash distributions	$ 64,248	$ 64,205	$ 57,057	$ 115,267	$ 115,084	$ 185,510	$ 347,335
Common Limited Partner [Member]
Distributions Made to Limited Partners and General Partner [Line Items]
Cash distributions per unit applicable to common limited partners	$ 0.60	$ 0.60	$ 0.60	$ 1.095	$ 1.095	$ 1.80	$ 3.285

PARTNERS' EQUITY Table 4 - Cash

PARTNERS' EQUITY Table 4 - Cash Distributions Paid - General and Common Limited Partners (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Distribution Made to General and Common Limited Partners [Line Items]
Cash distributions applicable to common limited partners and general partner (distribution earned)	$ 64,248	$ 64,205	$ 57,057	$ 115,267	$ 115,084	$ 185,510	$ 347,335
Common Limited Partner [Member]
Distribution Made to General and Common Limited Partners [Line Items]
Cash distributions per unit applicable to common limited partners	$ 0.60	$ 0.60	$ 0.60	$ 1.095	$ 1.095	$ 1.80	$ 3.285
Distribution date of record (distribution earned)	Nov. 8, 2018	Aug. 7, 2018	May 8, 2018	Feb. 8, 2018
Distribution payment date (distribution earned)	Nov. 14, 2018	Aug. 13, 2018	May 14, 2018	Feb. 13, 2018

PARTNERS' EQUITY Table 5 - Cash

PARTNERS' EQUITY Table 5 - Cash Distributions - Preferred Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				9 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018
Series A Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred units distribution percentage					8.50%
Preferred unit distribution paid		$ 0.53125	$ 0.53125	$ 0.53125
Cash distributions applicable to preferred limited partners		$ 4,813	$ 4,813	$ 4,813
Distribution date of record		Sep. 4, 2018	Jun. 1, 2018	Mar. 1, 2018
Distribution payment date		Sep. 17, 2018	Jun. 15, 2018	Mar. 15, 2018
Series B Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred units distribution percentage					7.625%
Preferred unit distribution paid		$ 0.47657	$ 0.47657	$ 0.47657
Cash distributions applicable to preferred limited partners		$ 7,339	$ 7,339	$ 7,339
Distribution date of record		Sep. 4, 2018	Jun. 1, 2018	Mar. 1, 2018
Distribution payment date		Sep. 17, 2018	Jun. 15, 2018	Mar. 15, 2018
Series C Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred units distribution percentage					9.00%
Preferred unit distribution paid		$ 0.5625	$ 0.56250	$ 0.65625
Cash distributions applicable to preferred limited partners		$ 3,881	$ 3,881	$ 4,528
Distribution date of record		Sep. 4, 2018	Jun. 1, 2018	Mar. 1, 2018
Distribution payment date		Sep. 17, 2018	Jun. 15, 2018	Mar. 15, 2018
Subsequent Event [Member] | Series A Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution declared	$ 0.53125
Cash distributions applicable to preferred limited partners	$ 4,813
Distribution date of record	Dec. 3, 2018
Distribution payment date	Dec. 17, 2018
Subsequent Event [Member] | Series B Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution declared	$ 0.47657
Cash distributions applicable to preferred limited partners	$ 7,339
Distribution date of record	Dec. 3, 2018
Distribution payment date	Dec. 17, 2018
Subsequent Event [Member] | Series C Preferred Limited Partner [Member]
Distribution Made to Limited Partner [Line Items]
Preferred unit distribution declared	$ 0.5625
Cash distributions applicable to preferred limited partners	$ 3,881
Distribution date of record	Dec. 3, 2018
Distribution payment date	Dec. 17, 2018

PARTNERS' EQUITY Narrative 3 (D

PARTNERS' EQUITY Narrative 3 (Details)	6 Months Ended
	Jun. 30, 2018
Class of Stock [Line Items]
General partner ownership interest	2.00%
Common Limited Partner [Member]
Class of Stock [Line Items]
Common unitholders ownership interest	98.00%
General Partner [Member]
Class of Stock [Line Items]
General partner ownership interest	2.00%

PARTNERS' EQUITY Table 6 - Bala

PARTNERS' EQUITY Table 6 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2018	$ (84,927)
Other comprehensive income (loss)	23,204
Balance as of September 30, 2018	(61,723)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2018	(51,603)
Other comprehensive income (loss) before reclassification adjustments	(6,536)
Other	60
Other comprehensive income (loss)	(6,476)
Balance as of September 30, 2018	(58,079)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2018	(24,304)
Other comprehensive income (loss) before reclassification adjustments	26,067
Other	0
Other comprehensive income (loss)	30,338
Balance as of September 30, 2018	6,034
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2018	(9,020)
Other comprehensive income (loss) before reclassification adjustments	0
Other	(47)
Other comprehensive income (loss)	(658)
Balance as of September 30, 2018	(9,678)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2018	(84,927)
Other comprehensive income (loss) before reclassification adjustments	19,531
Other	13
Other comprehensive income (loss)	23,204
Balance as of September 30, 2018	(61,723)
Other income, net | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	0
Other income, net | Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	0
Other income, net | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	(611)
Other income, net | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	(611)
Interest expense, net | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	0
Interest expense, net | Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	4,271
Interest expense, net | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	0
Interest expense, net | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, net of tax	$ 4,271

REVENUE FROM CONTRACTS WITH C_3

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 1 - Adoption Impact of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 490,363	$ 440,566	$ 1,452,448	$ 1,363,484
Operating income (loss)	95,277	91,717	273,595	262,260
Net income (loss)	$ 48,136	$ 38,592	$ 203,668	$ 122,782
Basic net loss per common unit	$ (3.49)	$ 0.15	$ (2.50)	$ 0.65
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Revenue Recognition [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 490,799		$ 1,457,231
Operating income (loss)	95,713		278,378
Net income (loss)	$ 48,572		$ 208,451
Basic net loss per common unit	$ (3.49)		$ (2.45)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenue Recognition [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ (436)		$ (4,783)
Operating income (loss)	(436)		(4,783)
Net income (loss)	$ (436)		$ (4,783)
Basic net loss per common unit	$ 0		$ (0.05)

REVENUE FROM CONTRACTS WITH C_4

REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative 1 (Details)	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Payment terms	Generally, payment terms do not exceed 30 days.

REVENUE FROM CONTRACTS WITH C_5

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 2 - Contract Assets and Liabilities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Contract assets
Balance as of January 1, 2018	$ 2,127
Additions	1,086
Transfer to accounts receivable	(2,576)
Total activity	(1,490)
Balance as of September 30, 2018	637
Less current portion	227
Noncurrent portion	410
Contract liabilities
Balance as of January 1, 2018	(60,464)
Additions	(64,492)
Transfer to revenues	42,417
Total activity	(22,075)
Balance as of September 30, 2018	(82,539)
Less current portion	(45,456)
Noncurrent portion	$ (37,083)

REVENUE FROM CONTRACTS WITH C_6

REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative 2 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018
Additions to contract liability			$ 64,492
Revenue recognized due to change in contract liability		$ 9,000
Unnamed Customer [Member]
Additions to contract liability	$ 37,500
Additions to other current assets	$ 37,500

REVENUE FROM CONTRACTS WITH C_7

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 3 - Expected Timing of Satisfaction of Performance Obligations (Details) $ in Thousands	Sep. 30, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 126,787
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 411,841
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
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	$ 255,824
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	$ 171,557
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	$ 130,517
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	$ 1,530,800
Revenue, remaining performance obligation, expected timing of satisfaction, period

REVENUE FROM CONTRACTS WITH C_8

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 4 - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 490,363	$ 440,566	$ 1,452,448	$ 1,363,484
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Total revenues	(1,719)	(2,394)	(5,799)	(10,066)
Pipeline Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	162,843	137,426	449,855	385,406
Lessor revenues	0	0	54	0
Total revenues	162,843	137,426	449,909	385,406
Pipeline Segment | Crude Oil Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	67,543	53,490	181,487	137,276
Pipeline Segment | Refined Products and Ammonia Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	95,300	83,936	268,368	248,130
Storage Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	144,167	148,289	437,021	434,716
Lessor revenues	9,963	9,782	29,887	29,345
Total revenues	154,130	158,071	466,908	464,061
Storage Segment | Throughput Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	21,143	21,120	61,300	63,932
Storage Segment | Storage Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	123,024	127,169	375,721	370,784
Fuels Marketing Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	175,109	147,463	541,430	524,083
Total revenues	$ 175,109	$ 147,463	$ 541,430	$ 524,083

NET (LOSS) INCOME PER COMMON _3

NET (LOSS) INCOME PER COMMON UNIT Narrative (Details) - shares	Sep. 30, 2018	Dec. 31, 2017
Temporary Equity Disclosure [Abstract]
Series D preferred units outstanding	23,246,650	0

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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 48,136	$ 38,592	$ 203,668	$ 122,782
Distributions to preferred limited partners	(29,881)	(12,153)	(62,116)	(26,916)
Distributions to general partner (including incentive distribution rights)	0	(13,214)	(1,141)	(41,683)
Distributions to common limited partners	(64,248)	(101,870)	(184,369)	(305,652)
Distribution equivalent rights to restricted units	(473)	(707)	(1,398)	(2,134)
Distributions in excess of earnings	(46,466)	(89,352)	(45,356)	(253,603)
Distributions to common limited partners	64,248	101,870	184,369	305,652
Allocation of distributions in excess of earnings	(46,466)	(87,565)	(45,378)	(248,531)
Series D Preferred Unit accretion (refer to Note 11)	(4,031)	0	(4,031)	0
Loss to common unitholders attributable to the Merger (refer to Note 2)	(377,079)	0	377,079	0
Net (loss) income attributable to common units:	$ (363,328)	$ 14,305	$ (242,119)	$ 57,121
Basic weighted-average common units outstanding	104,264,796	93,031,320	96,920,202	87,392,597
Basic net (loss) income per common unit	$ (3.49)	$ 0.15	$ (2.50)	$ 0.65

STATEMENTS OF CASH FLOWS Table

STATEMENTS OF CASH FLOWS Table 1 - Changes in Current Assets and Current Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Decrease (increase) in current assets:
Accounts receivable	$ 11,530	$ 24,538
Receivable from related party	160	236
Inventories	2,079	15,497
Other current assets	(953)	1,176
Increase (decrease) in current liabilities:
Accounts payable	18,082	(52,910)
Accrued interest payable	(9,700)	7,829
Accrued liabilities	4,830	(10,702)
Taxes other than income tax	4,809	279
Income tax payable	406	(3,614)
Changes in current assets and current liabilities	$ 31,243	$ (17,671)

STATEMENTS OF CASH FLOWS Tabl_2

STATEMENTS OF CASH FLOWS Table 2 - Cash Flows Related to Interest and Income Taxes (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows [Abstract]
Cash paid for interest, net of amount capitalized	$ 145,089	$ 112,335
Cash paid for income taxes, net of tax refunds received	$ 8,490	$ 10,090

SEGMENT INFORMATION Table 1 - R

SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Total revenues	$ 490,363	$ 440,566	$ 1,452,448	$ 1,363,484
Operating income:
General and administrative expenses	27,817	25,003	75,572	83,202
Other depreciation and amortization expense	2,276	2,189	6,645	6,581
Operating income (loss)	95,277	91,717	273,595	262,260
Pipeline Segment
Revenues:
Total revenues	162,843	137,426	449,909	385,406
Storage Segment
Revenues:
Total revenues	154,130	158,071	466,908	464,061
Storage Segment | Third Party Revenue [Member]
Revenues:
Total revenues	152,411	155,677	461,109	453,995
Storage Segment | Intersegment Revenue [Member]
Revenues:
Total revenues	1,719	2,394	5,799	10,066
Fuels Marketing Segment
Revenues:
Total revenues	175,109	147,463	541,430	524,083
Operating Segments [Member]
Operating income:
Operating income (loss)	125,370	118,909	355,812	352,043
Operating Segments [Member] | Pipeline Segment
Operating income:
Operating income (loss)	77,021	61,119	197,794	179,015
Operating Segments [Member] | Storage Segment
Operating income:
Operating income (loss)	46,459	59,323	146,904	169,131
Operating Segments [Member] | Fuels Marketing Segment
Operating income:
Operating income (loss)	1,890	(1,532)	11,114	3,897
Intersegment Eliminations [Member]
Revenues:
Total revenues	(1,719)	(2,394)	(5,799)	(10,066)
Operating income:
Operating income (loss)	0	(1)	0	0
Corporate, Non-Segment [Member]
Operating income:
General and administrative expenses	27,817	25,003	75,572	83,202
Other depreciation and amortization expense	$ 2,276	$ 2,189	$ 6,645	$ 6,581

SEGMENT INFORMATION Table 2 - A

SEGMENT INFORMATION Table 2 - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Segment Information
Total assets	$ 6,720,958	$ 6,535,233
Other Partnership Assets
Segment Information
Total assets	194,162	188,507
Operating Segments [Member]
Segment Information
Total assets	6,526,796	6,346,726
Operating Segments [Member] | Pipeline Segment
Segment Information
Total assets	3,606,413	3,492,417
Operating Segments [Member] | Storage Segment
Segment Information
Total assets	2,787,886	2,735,563
Operating Segments [Member] | Fuels Marketing Segment
Segment Information
Total assets	$ 132,497	$ 118,746

CONDENSED CONSOLIDATING FINAN_3

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Narrative (Details) - NuStar Energy	2 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018
NuPOP
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%	100.00%	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%	100.00%	100.00%

CONDENSED CONSOLIDATING FINAN_4

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 24,579		$ 24,292	$ 33,615	$ 35,942
Receivables, net	164,768		176,775
Inventories	24,761		26,857
Other current assets	62,766		22,508
Intercompany receivable	0		0
Total current assets	276,874		250,432
Property, plant and equipment, net	4,484,848		4,300,933
Intangible assets, net	745,912		784,479
Goodwill	1,094,661		1,097,475
Investment in wholly owned subsidiaries	0		0
Deferred income tax asset	0		233
Other long-term assets, net	118,663		101,681
Total assets	6,720,958		6,535,233
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	154,212		145,932
Short-term debt	10,500		35,000
Current portion of long-term debt	0		349,990
Accrued interest payable	30,845		40,449
Accrued liabilities	97,298		61,578
Taxes other than income tax	19,695		14,385
Income tax payable	4,576		4,172
Intercompany payable	0		0
Total current liabilities	317,126		651,506
Long-term debt, less current portion	3,376,852		3,263,069
Deferred income tax liability	23,343		22,272
Other long-term liabilities	96,911		118,297
Series D preferred units	559,844	$ 370,711	0
Total partners' equity	2,346,882		2,480,089
Total liabilities, mezzanine equity and partners’ equity	6,720,958		6,535,233
Eliminations [Member]
Assets
Cash and cash equivalents	0		0	0	0
Receivables, net	0		0
Inventories	0		0
Other current assets	0		0
Intercompany receivable	(2,914,432)		(3,112,164)
Total current assets	(2,914,432)		(3,112,164)
Property, plant and equipment, net	0		0
Intangible assets, net	0		0
Goodwill	0		0
Investment in wholly owned subsidiaries	(5,124,172)		(5,008,132)
Deferred income tax asset			0
Other long-term assets, net	0		0
Total assets	(8,038,604)		(8,120,296)
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	0		0
Short-term debt	0		0
Current portion of long-term debt			0
Accrued interest payable	0		0
Accrued liabilities	0		0
Taxes other than income tax	0		0
Income tax payable	0		0
Intercompany payable	(2,914,432)		(3,112,164)
Total current liabilities	(2,914,432)		(3,112,164)
Long-term debt, less current portion	0		0
Deferred income tax liability	0		0
Other long-term liabilities	0		0
Series D preferred units	0
Total partners' equity	(5,124,172)		(5,008,132)
Total liabilities, mezzanine equity and partners’ equity	(8,038,604)		(8,120,296)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	1,164		885	894	870
Receivables, net	0		0
Inventories	0		0
Other current assets	122		61
Intercompany receivable	187,967		0
Total current assets	189,253		946
Property, plant and equipment, net	0		0
Intangible assets, net	0		0
Goodwill	0		0
Investment in wholly owned subsidiaries	2,793,521		2,891,371
Deferred income tax asset			0
Other long-term assets, net	303		303
Total assets	2,983,077		2,892,620
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	13,636		4,078
Short-term debt	0		0
Current portion of long-term debt			0
Accrued interest payable	0		0
Accrued liabilities	929		1,105
Taxes other than income tax	63		125
Income tax payable	0		0
Intercompany payable	0		322,296
Total current liabilities	14,628		327,604
Long-term debt, less current portion	0		0
Deferred income tax liability	0		0
Other long-term liabilities	0		0
Series D preferred units	559,844
Total partners' equity	2,408,605		2,565,016
Total liabilities, mezzanine equity and partners’ equity	2,983,077		2,892,620
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	4,238		29	28	5
Receivables, net	82		280
Inventories	1,875		1,686
Other current assets	16,961		11,412
Intercompany receivable	2,726,465		3,112,164
Total current assets	2,749,621		3,125,571
Property, plant and equipment, net	1,846,330		1,893,720
Intangible assets, net	51,463		58,530
Goodwill	149,453		149,453
Investment in wholly owned subsidiaries	29,961		24,162
Deferred income tax asset			0
Other long-term assets, net	77,144		65,684
Total assets	4,903,972		5,317,120
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	26,423		27,642
Short-term debt	10,500		35,000
Current portion of long-term debt			349,990
Accrued interest payable	30,785		40,402
Accrued liabilities	16,608		17,628
Taxes other than income tax	7,152		7,110
Income tax payable	364		732
Intercompany payable	0		0
Total current liabilities	91,832		478,504
Long-term debt, less current portion	3,313,528		3,201,220
Deferred income tax liability	1,262		1,262
Other long-term liabilities	45,099		58,806
Series D preferred units	0
Total partners' equity	1,452,251		1,577,328
Total liabilities, mezzanine equity and partners’ equity	4,903,972		5,317,120
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	0		0	0	0
Receivables, net	0		0
Inventories	6,822		8,611
Other current assets	1,284		4,191
Intercompany receivable	0		0
Total current assets	8,106		12,802
Property, plant and equipment, net	619,284		591,070
Intangible assets, net	0		0
Goodwill	170,652		170,652
Investment in wholly owned subsidiaries	1,450,865		1,301,717
Deferred income tax asset			0
Other long-term assets, net	26,861		27,493
Total assets	2,275,768		2,103,734
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	5,935		13,160
Short-term debt	0		0
Current portion of long-term debt			0
Accrued interest payable	0		0
Accrued liabilities	7,971		9,450
Taxes other than income tax	5,893		3,794
Income tax payable	0		4
Intercompany payable	1,393,208		1,277,691
Total current liabilities	1,413,007		1,304,099
Long-term debt, less current portion	0		0
Deferred income tax liability	12		12
Other long-term liabilities	13,124		8,861
Series D preferred units	0
Total partners' equity	849,625		790,762
Total liabilities, mezzanine equity and partners’ equity	2,275,768		2,103,734
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	19,177		23,378	$ 32,693	$ 35,067
Receivables, net	164,686		176,495
Inventories	16,064		16,560
Other current assets	44,399		6,844
Intercompany receivable	0		0
Total current assets	244,326		223,277
Property, plant and equipment, net	2,019,234		1,816,143
Intangible assets, net	694,449		725,949
Goodwill	774,556		777,370
Investment in wholly owned subsidiaries	849,825		790,882
Deferred income tax asset			233
Other long-term assets, net	14,355		8,201
Total assets	4,596,745		4,342,055
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	108,218		101,052
Short-term debt	0		0
Current portion of long-term debt			0
Accrued interest payable	60		47
Accrued liabilities	71,790		33,395
Taxes other than income tax	6,587		3,356
Income tax payable	4,212		3,436
Intercompany payable	1,521,224		1,512,177
Total current liabilities	1,712,091		1,653,463
Long-term debt, less current portion	63,324		61,849
Deferred income tax liability	22,069		20,998
Other long-term liabilities	38,688		50,630
Series D preferred units	0
Total partners' equity	2,760,573		2,555,115
Total liabilities, mezzanine equity and partners’ equity	$ 4,596,745		$ 4,342,055

CONDENSED CONSOLIDATING FINAN_5

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 2 - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 490,363	$ 440,566	$ 1,452,448	$ 1,363,484
Costs and expenses	395,086	348,849	1,178,853	1,101,224
Operating (loss) income	95,277	91,717	273,595	262,260
Equity in earnings (loss) of subsidiaries	0	0	0	0
Interest income (expense), net	(44,825)	(45,256)	(141,533)	(127,282)
Other income (expense), net	920	(5,126)	82,084	(4,898)
Income before income tax expense	51,372	41,335	214,146	130,080
Income tax expense (benefit)	3,236	2,743	10,478	7,298
Net income (loss)	48,136	38,592	203,668	122,782
Comprehensive income (loss)	53,037	44,482	226,872	133,566
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	(106)	(139)	(455)	(773)
Costs and expenses	(106)	(139)	(455)	(773)
Operating (loss) income	0	0	0	0
Equity in earnings (loss) of subsidiaries	(106,564)	(94,655)	(575,080)	(304,220)
Interest income (expense), net	0	0	0	0
Other income (expense), net	0	0	0	0
Income before income tax expense	(106,564)	(94,655)	(575,080)	(304,220)
Income tax expense (benefit)	0	0	0	0
Net income (loss)	(106,564)	(94,655)	(575,080)	(304,220)
Comprehensive income (loss)	(106,564)	(94,655)	(575,080)	(304,220)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0	0	0
Costs and expenses	600	332	1,750	1,327
Operating (loss) income	(600)	(332)	(1,750)	(1,327)
Equity in earnings (loss) of subsidiaries	48,668	38,896	205,281	124,073
Interest income (expense), net	68	28	137	36
Other income (expense), net	0	0	0	0
Income before income tax expense	48,136	38,592	203,668	122,782
Income tax expense (benefit)	0	0	0	0
Net income (loss)	48,136	38,592	203,668	122,782
Comprehensive income (loss)	48,136	38,592	203,668	122,782
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	127,165	127,980	364,721	380,504
Costs and expenses	76,932	77,668	235,936	237,086
Operating (loss) income	50,233	50,312	128,785	143,418
Equity in earnings (loss) of subsidiaries	9,405	(4,558)	8,848	(10,625)
Interest income (expense), net	(45,532)	(46,247)	(145,915)	(129,551)
Other income (expense), net	468	57	2,792	140
Income before income tax expense	14,574	(436)	(5,490)	3,382
Income tax expense (benefit)	82	115	313	81
Net income (loss)	14,492	(551)	(5,803)	3,301
Comprehensive income (loss)	19,751	(1,031)	24,535	(1,592)
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	62,981	58,871	185,760	161,689
Costs and expenses	40,497	38,709	118,002	106,296
Operating (loss) income	22,484	20,162	67,758	55,393
Equity in earnings (loss) of subsidiaries	13,884	20,809	149,032	69,770
Interest income (expense), net	(1,882)	(1,455)	(5,177)	(4,160)
Other income (expense), net	119	(8)	307	1
Income before income tax expense	34,605	39,508	211,920	121,004
Income tax expense (benefit)	0	1	1	3
Net income (loss)	34,605	39,507	211,919	121,001
Comprehensive income (loss)	34,605	39,507	211,919	121,001
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	300,323	253,854	902,422	822,064
Costs and expenses	277,163	232,279	823,620	757,288
Operating (loss) income	23,160	21,575	78,802	64,776
Equity in earnings (loss) of subsidiaries	34,607	39,508	211,919	121,002
Interest income (expense), net	2,521	2,418	9,422	6,393
Other income (expense), net	333	(5,175)	78,985	(5,039)
Income before income tax expense	60,621	58,326	379,128	187,132
Income tax expense (benefit)	3,154	2,627	10,164	7,214
Net income (loss)	57,467	55,699	368,964	179,918
Comprehensive income (loss)	$ 57,109	$ 62,069	$ 361,830	$ 195,595

CONDENSED CONSOLIDATING FINAN_6

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 3 - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net cash provided by operating activities	$ 363,320	$ 311,015
Cash flows from investing activities:
Capital expenditures	(338,440)	(220,617)
Change in accounts payable related to capital expenditures	(18,630)	13,272
Proceeds from sale or disposition of assets	2,220	2,023
Proceeds from insurance recoveries	78,419	0
Investment in subsidiaries		0
Proceeds from Axeon term loan	0	110,000
Acquisitions	(37,502)	(1,461,719)
Investment in other long-term assets	(3,280)	0
Net cash provided by (used in) investing activities	(317,213)	(1,557,041)
Cash flows from financing activities:
Debt borrowings	1,523,953	1,971,204
Debt repayments	(1,778,498)	(1,938,739)
Proceeds from note offering, net of issuance costs	0	543,313
Proceeds from issuance of Series D preferred units	590,000	0
Payment of issuance costs for Series D preferred units	(34,187)	0
Proceeds from issuance of other preferred units, net of issuance costs	0	371,802
Proceeds from issuance of common units, net of issuance costs	10,000	643,858
General partner contribution	204	13,597
Distributions to preferred unitholders	(60,247)	(26,681)
Distributions to common unitholders and general partner	(236,549)	(331,222)
Cash consideration for Merger (Note 2)	(61,271)	0
Proceeds from termination of interest rate swaps	8,048	0
Contributions from distributions to affiliates		0
Net intercompany activity	0	0
Other, net	(6,554)	(5,070)
Net cash (used in) provided by financing activities	(45,101)	1,242,062
Effect of foreign exchange rate changes on cash	(719)	1,637
Net increase (decrease) in cash and cash equivalents	287	(2,327)
Cash and cash equivalents as of the beginning of the period	24,292	35,942
Cash and cash equivalents as of the end of the period	24,579	33,615
Eliminations [Member]
Cash flows from operating activities:
Net cash provided by operating activities	(445,211)	(536,872)
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
Investment in subsidiaries		1,262,126
Proceeds from Axeon term loan		0
Acquisitions	0	0
Net cash provided by (used in) investing activities	0	1,262,126
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Proceeds from note offering, net of issuance costs		0
Proceeds from issuance of Series D preferred units	0
Payment of issuance costs for Series D preferred units	0
Proceeds from issuance of other preferred units, net of issuance costs		0
Proceeds from issuance of common units, net of issuance costs	0	0
General partner contribution	0	0
Distributions to preferred unitholders	90,372	40,023
Distributions to common unitholders and general partner	354,839	496,849
Cash consideration for Merger (Note 2)	0
Proceeds from termination of interest rate swaps	0
Contributions from distributions to affiliates		(1,262,126)
Net intercompany activity	0	0
Other, net	0	0
Net cash (used in) provided by financing activities	445,211	(725,254)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of the beginning of the period	0	0
Cash and cash equivalents as of the end of the period	0	0
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	296,475	355,864
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
Investment in subsidiaries		(1,262,000)
Proceeds from Axeon term loan		0
Acquisitions	0	0
Net cash provided by (used in) investing activities	0	(1,262,000)
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Proceeds from note offering, net of issuance costs		0
Proceeds from issuance of Series D preferred units	590,000
Payment of issuance costs for Series D preferred units	(34,187)
Proceeds from issuance of other preferred units, net of issuance costs		371,802
Proceeds from issuance of common units, net of issuance costs	10,000	643,858
General partner contribution	204	13,597
Distributions to preferred unitholders	(60,249)	(26,681)
Distributions to common unitholders and general partner	(236,549)	(331,222)
Cash consideration for Merger (Note 2)	(61,411)
Proceeds from termination of interest rate swaps	0
Contributions from distributions to affiliates		0
Net intercompany activity	(501,574)	238,172
Other, net	(2,430)	(3,366)
Net cash (used in) provided by financing activities	(296,196)	906,160
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	279	24
Cash and cash equivalents as of the beginning of the period	885	870
Cash and cash equivalents as of the end of the period	1,164	894
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	60,254	128,395
Cash flows from investing activities:
Capital expenditures	(32,270)	(34,964)
Change in accounts payable related to capital expenditures	2,063	(1,223)
Proceeds from sale or disposition of assets	1,464	1,947
Proceeds from insurance recoveries	0
Investment in subsidiaries		0
Proceeds from Axeon term loan		110,000
Acquisitions	0	0
Net cash provided by (used in) investing activities	(28,743)	75,760
Cash flows from financing activities:
Debt borrowings	1,498,853	1,901,504
Debt repayments	(1,754,798)	(1,856,739)
Proceeds from note offering, net of issuance costs		543,313
Proceeds from issuance of Series D preferred units	0
Payment of issuance costs for Series D preferred units	0
Proceeds from issuance of other preferred units, net of issuance costs		0
Proceeds from issuance of common units, net of issuance costs	0	0
General partner contribution	0	0
Distributions to preferred unitholders	(30,123)	(13,340)
Distributions to common unitholders and general partner	(118,275)	(165,611)
Cash consideration for Merger (Note 2)	0
Proceeds from termination of interest rate swaps	8,048
Contributions from distributions to affiliates		1,262,000
Net intercompany activity	373,055	(1,873,773)
Other, net	(4,062)	(1,486)
Net cash (used in) provided by financing activities	(27,302)	(204,132)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	4,209	23
Cash and cash equivalents as of the beginning of the period	29	5
Cash and cash equivalents as of the end of the period	4,238	28
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	90,482	72,711
Cash flows from investing activities:
Capital expenditures	(14,002)	(18,138)
Change in accounts payable related to capital expenditures	(6,209)	4,445
Proceeds from sale or disposition of assets	20	17
Proceeds from insurance recoveries	0
Investment in subsidiaries		0
Proceeds from Axeon term loan		0
Acquisitions	(37,502)	0
Net cash provided by (used in) investing activities	(57,693)	(13,676)
Cash flows from financing activities:
Debt borrowings	0	0
Debt repayments	0	0
Proceeds from note offering, net of issuance costs		0
Proceeds from issuance of Series D preferred units	0
Payment of issuance costs for Series D preferred units	0
Proceeds from issuance of other preferred units, net of issuance costs		0
Proceeds from issuance of common units, net of issuance costs	0	0
General partner contribution	0	0
Distributions to preferred unitholders	(30,124)	(13,341)
Distributions to common unitholders and general partner	(118,274)	(165,611)
Cash consideration for Merger (Note 2)	0
Proceeds from termination of interest rate swaps	0
Contributions from distributions to affiliates		0
Net intercompany activity	115,609	119,917
Other, net	0	0
Net cash (used in) provided by financing activities	(32,789)	(59,035)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of the beginning of the period	0	0
Cash and cash equivalents as of the end of the period	0	0
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	361,320	290,917
Cash flows from investing activities:
Capital expenditures	(292,168)	(167,515)
Change in accounts payable related to capital expenditures	(14,484)	10,050
Proceeds from sale or disposition of assets	736	59
Proceeds from insurance recoveries	78,419
Investment in subsidiaries		(126)
Proceeds from Axeon term loan		0
Acquisitions	0	(1,461,719)
Net cash provided by (used in) investing activities	(230,777)	(1,619,251)
Cash flows from financing activities:
Debt borrowings	25,100	69,700
Debt repayments	(23,700)	(82,000)
Proceeds from note offering, net of issuance costs		0
Proceeds from issuance of Series D preferred units	0
Payment of issuance costs for Series D preferred units	0
Proceeds from issuance of other preferred units, net of issuance costs		0
Proceeds from issuance of common units, net of issuance costs	0	0
General partner contribution	0	0
Distributions to preferred unitholders	(30,123)	(13,342)
Distributions to common unitholders and general partner	(118,290)	(165,627)
Cash consideration for Merger (Note 2)	140
Proceeds from termination of interest rate swaps	0
Contributions from distributions to affiliates		126
Net intercompany activity	12,910	1,515,684
Other, net	(62)	(218)
Net cash (used in) provided by financing activities	(134,025)	1,324,323
Effect of foreign exchange rate changes on cash	(719)	1,637
Net increase (decrease) in cash and cash equivalents	(4,201)	(2,374)
Cash and cash equivalents as of the beginning of the period	23,378	35,067
Cash and cash equivalents as of the end of the period	$ 19,177	$ 32,693

SUBSEQUENT EVENT (Details)

SUBSEQUENT EVENT (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
Subsequent Event [Line Items]
Proceeds from expected sale of assets		$ 2,220	$ 2,023
Subsequent Event [Member] | Sale of U.K. and Amsterdam Operations [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Proceeds from expected sale of assets	$ 270,000
Description of assets to be sold	six liquids storage terminals in the United Kingdom and one facility in Amsterdam,