10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

 (Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2019

OR

☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from _______ to _______

Commission File Number 1-16417

  _________________________________________

NuStar Energy L.P.

(Exact name of registrant as specified in its charter)

  _________________________________________

Delaware	74-2956831
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

19003 IH-10 West

San Antonio, Texas

(Address of principal executive offices)

78257

(Zip Code)

Registrant’s telephone number, including area code (210) 918-2000

 _______________________________________

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common units	NS	New York Stock Exchange
Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units	NSprA	New York Stock Exchange
Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units	NSprB	New York Stock Exchange
Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units	NSprC	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  x    No  o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act:

Large accelerated filer	x	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    o   

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐   No  x

The number of common units outstanding as of July 31, 2019 was 107,763,602.

NUSTAR ENERGY L.P.

FORM 10-Q

TABLE OF CONTENTS

PART I – FINANCIAL INFORMATION
Item 1.	Financial Statements:
	Consolidated Balance Sheets as of June 30, 2019 and December 31, 2018	3
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three and Six Months Ended June 30, 2019 and 2018	4
	Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2019 and 2018	5
	Consolidated Statements of Partners’ Equity and Mezzanine Equity for the Three and Six Months Ended June 30, 2019 and 2018	6
	Condensed Notes to Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	47
Item 4.	Controls and Procedures	48
PART II – OTHER INFORMATION
Item 6.	Exhibits	49
SIGNATURES		50

2

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Unaudited, Thousands of Dollars, Except Unit Data)

	June 30, 2019			December 31, 2018
Assets
Current assets:
Cash and cash equivalents	$	15,299		$	11,529
Accounts receivable, net of allowance for doubtful accounts of $9,452 and $9,412 as of June 30, 2019 and December 31, 2018, respectively	117,688			110,417
Inventories	9,454			8,434
Prepaid and other current assets	29,591			17,374
Assets held for sale	301,529			599,347
Total current assets	473,561			747,101
Property, plant and equipment, at cost	5,981,860			5,627,805
Accumulated depreciation and amortization	(1,961,046		)	(1,853,003		)
Property, plant and equipment, net	4,020,814			3,774,802
Intangible assets, net	707,344			733,056
Goodwill	1,005,853			1,005,853
Other long-term assets, net	172,119			88,328
Total assets	$	6,379,691		$	6,349,140
Liabilities, Mezzanine Equity and Partners’ Equity
Current liabilities:
Accounts payable	$	128,547		$	103,122
Short-term debt and current portion of finance leases	10,087			18,500
Accrued interest payable	38,929			36,293
Accrued liabilities	69,970			74,418
Taxes other than income tax	14,060			16,823
Income tax payable	1,920			4,445
Liabilities held for sale	68,616			69,834
Total current liabilities	332,129			323,435
Long-term debt	3,456,461			3,111,996
Deferred income tax liability	12,250			12,428
Other long-term liabilities	176,951			79,558
Total liabilities	3,977,791			3,527,417
Commitments and contingencies (Note 6)
Series D preferred limited partners (23,246,650 preferred units outstanding as of June 30, 2019 and December 31, 2018) (Note 9)	572,597			563,992
Partners’ equity (Note 10):
Preferred limited partners
Series A (9,060,000 units outstanding as of June 30, 2019 and December 31, 2018)	218,307			218,307
Series B (15,400,000 units outstanding as of June 30, 2019 and December 31, 2018)	371,476			371,476
Series C (6,900,000 units outstanding as of June 30, 2019 and December 31, 2018)	166,518			166,518
Common limited partners (107,763,033 and 107,225,156 common units outstanding as of June 30, 2019 and December 31, 2018, respectively)	1,140,665			1,556,308
Accumulated other comprehensive loss	(67,663		)	(54,878		)
Total partners’ equity	1,829,303			2,257,731
Total liabilities, mezzanine equity and partners’ equity	$	6,379,691		$	6,349,140

See Condensed Notes to Consolidated Financial Statements.

3

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unaudited, Thousands of Dollars, Except Unit and Per Unit Data)

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Revenues:
Service revenues	$	282,472		$	259,599		$	541,499		$	507,668
Product sales	89,973			129,657			178,772			258,315
Total revenues	372,445			389,256			720,271			765,983
Costs and expenses:
Costs associated with service revenues:
Operating expenses (excluding depreciation and amortization expense)	101,095			102,241			196,506			190,320
Depreciation and amortization expense	64,991			61,777			129,809			121,601
Total costs associated with service revenues	166,086			164,018			326,315			311,921
Cost of product sales	86,389			119,939			172,571			245,089
General and administrative expenses (excluding depreciation and amortization expense)	24,868			26,754			50,559			44,896
Other depreciation and amortization expense	1,819			2,158			3,938			4,197
Total costs and expenses	279,162			312,869			553,383			606,103
Operating income	93,283			76,387			166,888			159,880
Interest expense, net	(45,693		)	(48,389		)	(89,984		)	(95,777		)
Other income, net	621			1,607			1,412			2,623
Income from continuing operations before income tax expense	48,211			29,605			78,316			66,726
Income tax expense	1,296			2,696			2,478			6,584
Income from continuing operations, net of tax	46,915			26,909			75,838			60,142
(Loss) income from discontinued operations, net of tax	(964		)	2,490			(307,750		)	95,390
Net income (loss)	$	45,951		$	29,399		$	(231,912	)	$	155,532
Basic net income (loss) per common unit (Note 11):
Continuing operations	$	0.11		$	0.12		$	0.05		$	0.30
Discontinued operations	(0.01		)	0.03			(2.86		)	1.00
Total net income (loss) per common unit	$	0.10		$	0.15		$	(2.81	)	$	1.30
Basic weighted-average common units outstanding	107,763,016			93,192,238			107,647,957			93,187,038
Comprehensive income (loss)	$	37,992		$	26,778		$	(244,697	)	$	173,835

See Condensed Notes to Consolidated Financial Statements.

4

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, Thousands of Dollars)

	Six Months Ended June 30,
	2019			2018
Cash Flows from Operating Activities:
Net (loss) income	$	(231,912	)	$	155,532
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization expense	142,283			147,879
Unit-based compensation expense	5,774			4,277
Amortization of debt related items	2,643			3,965
Gain from sale or disposition of assets	(1,300		)	(1,218		)
Asset impairment losses	305,715			—
Goodwill impairment loss	31,123			—
Gain from insurance recoveries	—			(78,756		)
Deferred income tax (benefit) expense	(575		)	1,142
Changes in current assets and current liabilities (Note 12)	(36,229		)	42,733
Decrease (increase) in other long-term assets	15,190			(11,224		)
Increase (decrease) in other long-term liabilities	9,157			(20,073		)
Other, net	(975		)	(407		)
Net cash provided by operating activities	240,894			243,850
Cash Flows from Investing Activities:
Capital expenditures	(319,961		)	(248,521		)
Change in accounts payable related to capital expenditures	16,144			(19,320		)
Proceeds from sale or disposition of assets	143			2,097
Proceeds from insurance recoveries	—			78,419
Acquisitions	—			(37,502		)
Net cash used in investing activities	(303,674		)	(224,827		)
Cash Flows from Financing Activities:
Proceeds from long-term debt borrowings	415,800			677,272
Proceeds from short-term debt borrowings	178,500			456,000
Proceeds from note offering, net of issuance costs	491,665			—
Long-term debt repayments	(616,800		)	(905,521		)
Short-term debt repayments	(191,000		)	(428,000		)
Proceeds from issuance of Series D preferred units	—			400,000
Payment of issuance costs for Series D preferred units	—			(29,289		)
Proceeds from issuance of common units	—			10,000
Distributions to preferred unitholders	(60,846		)	(32,713		)
Distributions to common unitholders and general partner	(129,025		)	(172,324		)
Proceeds from termination of interest rate swaps	—			8,048
Payment of tax withholding for unit-based compensation	(6,368		)	(69		)
Decrease in cash book overdrafts	(4,718		)	(436		)
Other, net	(3,451		)	(5,518		)
Net cash provided by (used in) financing activities	73,757			(22,550		)
Effect of foreign exchange rate changes on cash	261			(421		)
Net increase (decrease) in cash, cash equivalents and restricted cash	11,238			(3,948		)
Cash, cash equivalents and restricted cash as of the beginning of the period	13,644			24,292
Cash, cash equivalents and restricted cash as of the end of the period	$	24,882		$	20,344

See Condensed Notes to Consolidated Financial Statements.

5

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY AND MEZZANINE EQUITY

Three Months Ended June 30, 2019 and 2018

(Unaudited, Thousands of Dollars)

	Limited Partners														Mezzanine Equity
	Preferred			Common			General Partner		Accumulated Other Comprehensive Loss			Total Partners’ Equity (Note 10)			Series D Preferred Limited Partners (Note 9)			Total
Balance as of March 31, 2019	$	756,301		$	1,192,080		$	—	$	(59,704	)	$	1,888,677		$	568,293		$	2,456,970
Net income	16,033			15,528			—		—			31,561			14,390			45,951
Other comprehensive loss	—			—			—		(7,959		)	(7,959		)	—			(7,959		)
Distributions to partners:
Series A, B and C preferred	(16,033		)	—			—		—			(16,033		)	—			(16,033		)
Common ($0.60 per unit)	—			(64,658		)	—		—			(64,658		)	—			(64,658		)
Series D preferred	—			—			—		—			—			(14,390		)	(14,390		)
Unit-based compensation	—			2,146			—		—			2,146			—			2,146
Series D preferred unit accretion	—			(4,446		)	—		—			(4,446		)	4,446			—
Other	—			15			—		—			15			(142		)	(127		)
Balance as of June 30, 2019	$	756,301		$	1,140,665		$	—	$	(67,663	)	$	1,829,303		$	572,597		$	2,401,900

Balance as of March 31, 2018	$	756,494		$	1,772,874		$	26,692		$	(64,003	)	$	2,492,057		$	—		$	2,492,057
Net income	16,033			12,891			263			—			29,187			212			29,399
Other comprehensive loss	—			—			—			(2,621		)	(2,621		)	—			(2,621		)
Distributions to partners:
Series A, B and C preferred	(16,033		)	—			—			—			(16,033		)	—			(16,033		)
Common ($0.60 per unit) and general partner	—			(55,911		)	(1,141		)	—			(57,052		)	—			(57,052		)
Series D preferred	—			—			—			—			—			(212		)	(212		)
Issuance of common units, including contribution from general partner	—			10,000			204			—			10,204			—			10,204
Issuance of Series D preferred units	—			—			—			—			—			370,711			370,711
Unit-based compensation	—			1,765			—			—			1,765			—			1,765
Other	(160		)	(851		)	(19		)	—			(1,030		)	—			(1,030		)
Balance as of June 30, 2018	$	756,334		$	1,740,768		$	25,999		$	(66,624	)	$	2,456,477		$	370,711		$	2,827,188

See Condensed Notes to Consolidated Financial Statements.

6

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY AND MEZZANINE EQUITY

Six Months Ended June 30, 2019 and 2018

(Unaudited, Thousands of Dollars)

	Limited Partners														Mezzanine Equity
	Preferred			Common			General Partner		Accumulated Other Comprehensive Loss			Total Partners’ Equity (Note 10)			Series D Preferred Limited Partners (Note 9)			Total
Balance as of January 1, 2019	$	756,301		$	1,556,308		$	—	$	(54,878	)	$	2,257,731		$	563,992		$	2,821,723
Net income (loss)	32,066			(292,758		)	—		—			(260,692		)	28,780			(231,912		)
Other comprehensive loss	—			—			—		(12,785		)	(12,785		)	—			(12,785		)
Distributions to partners:
Series A, B and C preferred	(32,066		)	—			—		—			(32,066		)	—			(32,066		)
Common ($1.20 per unit)	—			(129,025		)	—		—			(129,025		)	—			(129,025		)
Series D preferred	—			—			—		—			—			(28,780		)	(28,780		)
Unit-based compensation	—			15,686			—		—			15,686			—			15,686
Series D preferred unit accretion	—			(8,748		)	—		—			(8,748		)	8,748			—
Other	—			(798		)	—		—			(798		)	(143		)	(941		)
Balance as of June 30, 2019	$	756,301		$	1,140,665		$	—	$	(67,663	)	$	1,829,303		$	572,597		$	2,401,900

Balance as of January 1, 2018	$	756,603		$	1,770,587		$	37,826		$	(84,927	)	$	2,480,089		$	—		$	2,480,089
Net income	32,023			120,831			2,466			—			155,320			212			155,532
Other comprehensive income	—			—			—			18,303			18,303			—			18,303
Distributions to partners:
Series A, B and C preferred	(32,023		)	—			—			—			(32,023		)	—			(32,023		)
Common ($1.695 per unit) and general partner	—			(157,945		)	(14,379		)	—			(172,324		)	—			(172,324		)
Series D preferred	—			—			—			—			—			(212		)	(212		)
Issuance of common units, including contribution from general partner	—			10,000			204			—			10,204			—			10,204
Issuance of Series D preferred units	—			—			—			—			—			370,711			370,711
Unit-based compensation	—			3,051			—			—			3,051			—			3,051
Other	(269		)	(5,756		)	(118		)	—			(6,143		)	—			(6,143		)
Balance as of June 30, 2018	$	756,334		$	1,740,768		$	25,999		$	(66,624	)	$	2,456,477		$	370,711		$	2,827,188

See Condensed Notes to Consolidated Financial Statements.

7

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. ORGANIZATION AND BASIS OF PRESENTATION

Organization and Operations

NuStar Energy L.P. (NYSE: NS) is a publicly held Delaware limited partnership engaged in the transportation of petroleum products and anhydrous ammonia, and the terminalling, storage and marketing of petroleum products. Unless otherwise indicated, the terms “NuStar Energy,” “NS,” “the Partnership,” “we,” “our” and “us” are used in this report to refer to NuStar Energy L.P., to one or more of our consolidated subsidiaries or to all of them taken as a whole.

On July 20, 2018, we completed the merger of NuStar GP Holdings, LLC (NuStar GP Holdings or NSH) with a subsidiary of NS. Consequently, NSH, which indirectly owns our general partner, became a wholly owned subsidiary of ours. Under the terms of the merger agreement, NSH unitholders received 0.55 of a common unit representing a limited partner interest in NS in exchange for each NSH unit owned at the effective time of the merger, resulting in approximately 13.4 million incremental NS common units outstanding after the merger.

We conduct our operations through our subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). We have three business segments: pipeline, storage and fuels marketing.

Recent Developments

On July 29, 2019, we closed on the sale of the equity interests in our wholly owned subsidiaries that own the St. Eustatius terminal and bunkering operations for approximately $250.0 million, subject to adjustment. Please refer to Note 3 for additional discussion.

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. Operating results for the three and six months ended June 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018.

We have reclassified certain previously reported amounts in the consolidated financial statements and notes to conform to current-period presentation. As further discussed in Note 3, we reclassified certain balances to assets and liabilities held for sale and certain revenues and expenses to discontinued operations. The consolidated statements of cash flows have not been adjusted to separately disclose cash flows related to discontinued operations.

New Accounting Policy

As of June 30, 2019, we have restricted cash representing legally restricted funds that are unavailable for general use totaling $8.7 million, which is included in “Prepaid and other current assets” on the consolidated balance sheet.

2. NEW ACCOUNTING PRONOUNCEMENTS

Securities and Exchange Commission Disclosure Update and Simplification

In August 2018, the Securities and Exchange Commission (SEC) issued final rules regarding disclosure requirements that were redundant, duplicative, overlapping or superseded by other SEC requirements or GAAP. The final rules primarily eliminated or reduced certain disclosure requirements, although they also required some additional disclosures. The guidance became effective on November 5, 2018, with an exception for the new disclosure requirement to present changes in partners’ equity in interim periods, which permits entities to begin disclosing this information in the quarter that begins after the effective date of the final rules. We elected to utilize this exception, and began presenting statements of partners’ equity on an interim basis beginning with the quarter ending March 31, 2019. These final rules did not have an impact on our financial position or results of operations.

8

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Cloud Computing Arrangements

In August 2018, the Financial Accounting Standards Board (FASB) issued guidance addressing a customer’s accounting for implementation costs incurred in a cloud computing arrangement (CCA) that is considered a service contract. Under the new guidance, implementation costs for a CCA should be evaluated for capitalization using the same approach as implementation costs associated with internal-use software and expensed over the term of the hosting arrangement. The guidance is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. Prospective adoption for eligible costs incurred on or after the date of adoption or retrospective adoption are permitted. We are currently evaluating whether we will adopt these provisions early and whether we will elect prospective or retrospective adoption, but we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures.

Disclosures for Defined Benefit Plans

In August 2018, the FASB issued amended guidance that makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. The guidance is effective for annual periods beginning after December 15, 2020, with early adoption permitted, using a retrospective approach. We are currently evaluating whether we will adopt these provisions early, but we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures.

Goodwill

In January 2017, the FASB issued amended guidance that simplifies the accounting for goodwill impairment by eliminating step 2 of the goodwill impairment test. Under the amended guidance, goodwill impairment will be measured as the excess of the reporting unit’s carrying value over its fair value, not to exceed the carrying amount of goodwill for that reporting unit. The changes are effective for annual and interim periods beginning after December 15, 2019, and amendments should be applied prospectively. Early adoption is permitted for any impairment tests performed after January 1, 2017. We adopted the amended guidance during the first quarter of 2019 and applied the guidance to the goodwill impairment discussed in Note 3.

Credit Losses

In June 2016, the FASB issued amended guidance that requires the use of a “current expected loss” model for financial assets measured at amortized cost and certain off-balance sheet credit exposures. Under this model, entities will be required to estimate the lifetime expected credit losses on such instruments based on historical experience, current conditions, and reasonable and supportable forecasts. This amended guidance also expands the disclosure requirements to enable users of financial statements to understand an entity’s assumptions, models and methods for estimating expected credit losses. The changes are effective for annual and interim periods beginning after December 15, 2019, and amendments should be applied using a modified retrospective approach. We currently expect to adopt the amended guidance on January 1, 2020, and we are assessing the impact of this amended guidance on our financial position, results of operations and disclosures. We plan to provide additional information about the expected impact at a future date.

Leases

In February 2016, the FASB issued amended guidance that requires lessees to recognize the assets and liabilities that arise from most leases on the balance sheet. For lessors, this amended guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. The changes are effective for annual and interim periods beginning after December 15, 2018, and amendments should be applied using one of two modified retrospective transition methods. We adopted these provisions on January 1, 2019 through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The transition adjustment related to the adoption was immaterial, and we do not expect the adoption of this guidance to impact the results of our operations going forward. Please refer to Note 7 for further discussion.

3. DISCONTINUED OPERATIONS AND IMPAIRMENTS

On May 9, 2019, we entered into a Share Purchase and Sale Agreement to sell the equity interests in our wholly owned subsidiaries that own the St. Eustatius terminal and bunkering operations (the St. Eustatius Operations), for approximately $250.0 million, subject to adjustment (the St. Eustatius Disposition). The St. Eustatius Disposition included a 14.3 million barrel storage and terminalling facility and related assets on the island of St. Eustatius in the Caribbean Netherlands. We closed the sale on July 29, 2019 and received net proceeds of approximately $234.0 million. We previously reported the terminal operations in our storage segment and the bunkering operations in our fuels marketing segment.

On November 30, 2018, we sold our European operations, which consisted of six liquids storage terminals in the United Kingdom and one facility in Amsterdam and related assets that were previously reported in our storage segment (the European Operations), for approximately $270.0 million (the European Disposition).

9

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

During the second quarter of 2019, we determined the assets and liabilities associated with the St. Eustatius Operations met the criteria to be classified as held for sale. We also determined the St. Eustatius Operations and the European Operations met the requirements to be reported as discontinued operations since the St. Eustatius Disposition and the European Disposition together represent a strategic shift that will have a major impact on our operations and financial results. These sales are part of our plan to improve our debt metrics and partially fund capital projects to grow our core business in North America. Accordingly, the consolidated balance sheets reflect the assets and liabilities associated with the St. Eustatius Operations as held for sale for all periods presented, and the condensed consolidated statements of comprehensive income reflect the St. Eustatius Operations and the European Operations as discontinued operations for all applicable periods presented.

Discontinued Operations

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars)
Revenues	$	92,837		$	96,948		$	231,480		$	196,102
Costs and expenses:
Cost of revenues	86,278			92,177			202,880			174,633
Impairment losses	8,398			—			336,838			—
General and administrative expenses (excluding depreciation and amortization expense)	305			1,227			610			2,859
Other depreciation and amortization expense	—			93			—			172
Total costs and expenses	94,981			93,497			540,328			177,664
Operating (loss) income	(2,144		)	3,451			(308,848		)	18,438
Interest income (expense), net	9			(547		)	32			(931		)
Other income (expense), net	1,171			(195		)	1,167			78,541
(Loss) income from discontinued operations before income tax expense	(964		)	2,709			(307,649		)	96,048
Income tax expense	—			219			101			658
(Loss) income from discontinued operations, net of tax	$	(964	)	$	2,490		$	(307,750	)	$	95,390

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

	Six Months Ended June 30,
	2019			2018
	(Thousands of Dollars)
Capital expenditures	$	(23,635	)	$	(82,111	)
Significant noncash operating activities:
Depreciation and amortization expense	$	8,536		$	22,081
Asset impairment losses	$	305,715		$	—
Goodwill impairment loss	$	31,123		$	—
Gain from insurance recoveries	$	—		$	(78,756	)

Impairments

On January 28, 2019, the U.S. Department of the Treasury’s Office of Foreign Assets Control added Petroleos de Venezuela, S.A. (PDVSA), at the time a customer at our St. Eustatius facility, to its List of Specially Designated Nationals and Blocked Persons (the SDN List). The inclusion of PDVSA on the SDN List required us to wind down our contracts with PDVSA. Prior to winding down such contracts, PDVSA was the St. Eustatius terminal’s largest customer.

10

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

The effect of the sanctions issued against PDVSA, combined with the progression in the sale negotiations that occurred during March 2019, resulted in triggering events that caused us to evaluate the long-lived assets and goodwill associated with the St. Eustatius terminal and bunkering operations for potential impairment.

With respect to the terminal operations long-lived assets, our estimates of future expected cash flows included the possibility of a near-term sale, as well as continuing to operate the terminal. The carrying value of the terminal’s long-lived assets exceeded our estimate of the total expected cash flows, indicating the long-lived assets were potentially impaired. To determine an impairment amount, we estimated the fair value of the long-lived assets for comparison to the carrying amount of those assets. Our estimate of the fair value considered the expected sales price as well as estimates generated from income and market approaches using a market participant’s assumptions. The estimated fair values resulting from the market and income approaches were consistent with the expected sales price. Therefore, we concluded that the estimated sales price, which was less than the carrying amount of the long-lived assets, represented the best estimate of fair value at March 31, 2019, and we recorded a long-lived asset impairment charge of $297.3 million in the first quarter of 2019 to reduce the carrying value of the assets to their estimated fair value. We recorded an additional impairment charge of $8.4 million in the second quarter of 2019, mainly due to additional capital expenditures incurred in the second quarter. Our estimate of the fair value is based on a transaction price in a market that is not active and thus falls within Level 2 of the fair value hierarchy.

With respect to the goodwill in the Statia Bunkering reporting unit, which consists of our bunkering operations at our St. Eustatius terminal facility, we estimated the fair value based on the expected sales price discussed above, which is inclusive of the bunkering operations. As a result, we concluded the goodwill was impaired. Consistent with FASB’s amended goodwill impairment guidance discussed in Note 2, which we adopted in the first quarter of 2019, we measured the goodwill impairment as the difference between the reporting unit’s carrying value and its fair value. Therefore, we recognized a goodwill impairment charge of $31.1 million in the first quarter of 2019 to reduce the goodwill to $0.

The impairment charges are included in “(Loss) income from discontinued operations, net of tax” on the condensed consolidated statements of comprehensive income (loss).

Assets and Liabilities Held for Sale

The following is a reconciliation of the carrying amounts of the major classes of assets and liabilities included in “Assets held for sale” and “Liabilities held for sale” on the consolidated balance sheets:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Total current assets	$	46,826	$	54,404
Property, plant and equipment, net	223,723		513,820
Goodwill	—		31,123
Other long-term assets, net	30,980		—
Assets held for sale	$	301,529	$	599,347
Total current liabilities	$	44,625	$	69,834
Total long-term liabilities	23,991		—
Liabilities held for sale	$	68,616	$	69,834

11

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

4. REVENUE FROM CONTRACTS WITH CUSTOMERS

Contract Assets and Contract Liabilities

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

	2019						2018
	Contract Assets			Contract Liabilities			Contract Assets			Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,066		$	(21,579	)	$	1,956		$	(13,801	)
Noncurrent portion	539			(38,945		)	171			(46,361		)
Held for sale	—			(25,357		)	—			(302		)
Total	2,605			(85,881		)	2,127			(60,464		)
Activity:
Additions	2,674			(24,537		)	879			(20,820		)
Transfer to accounts receivable	(2,638		)	—			(2,397		)	—
Transfer to revenues, including amounts reported in discontinued operations	—			46,757			—			28,466
Total	36			22,220			(1,518		)	7,646
Balances as of June 30:
Current portion	1,483			(23,688		)	327			(17,881		)
Noncurrent portion	1,158			(39,973		)	282			(34,669		)
Held for sale	—			—			—			(268		)
Total	$	2,641		$	(63,661	)	$	609		$	(52,818	)

As previously discussed in Note 3, the inclusion of PDVSA on the SDN List prevents us from providing services to PDVSA until such time as these sanctions are lifted or otherwise modified. As a result, in the first quarter of 2019 we accelerated the recognition of revenue totaling $16.3 million, representing the amount remaining from a third quarter 2018 settlement we entered into with PDVSA.

Remaining Performance Obligations

The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of June 30, 2019 (in thousands of dollars):

2019 (remaining)	$	252,055
2020	422,044
2021	290,290
2022	241,784
2023	172,720
Thereafter	332,782
Total	$	1,711,675

Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to service customer contracts that have fixed pricing and fixed volume terms and conditions, generally including contracts with payment obligations for take-or-pay minimum volume commitments. The revenue shown above includes $9.4 million relating to the St. Eustatius Operations that were sold on July 29, 2019.

12

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Disaggregation of Revenues

The following table disaggregates our revenues:

	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019			2018
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	77,293	$	60,507		$	145,771		$	113,944
Refined products and ammonia pipelines	92,534		89,769			177,640			173,068
Total pipeline segment revenues from contracts with customers	169,827		150,276			323,411			287,012
Lessor revenues	2,666		—			5,333			54
Total pipeline segment revenues	172,493		150,276			328,744			287,066
Storage segment:
Throughput terminals	23,170		20,140			44,856			40,157
Storage terminals	77,039		84,718			148,660			166,159
Total storage segment revenues from contracts with customers	100,209		104,858			193,516			206,316
Lessor revenues	10,194		9,962			20,387			19,924
Total storage segment revenues	110,403		114,820			213,903			226,240
Fuels marketing segment:
Revenues from contracts with customers	89,549		124,293			177,628			252,951
Consolidation and intersegment eliminations	—		(133		)	(4		)	(274		)
Total revenues	$	372,445	$	389,256		$	720,271		$	765,983

5. DEBT

Revolving Credit Agreement

As of June 30, 2019, we had $543.0 million outstanding under our $1.4 billion revolving credit agreement (the Revolving Credit Agreement). The Revolving Credit Agreement bears interest, at our option, based on an alternative base rate, a LIBOR-based rate or a EURIBOR-based rate. The interest rate on the Revolving Credit Agreement is subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. In the second quarter of 2019, our credit rating was downgraded by S&P Global Ratings from BB to BB-, and our outlook was changed from negative to stable by S&P Global Ratings, Moody’s Investor Service Inc. and Fitch, Inc. However, per the terms of the Revolving Credit Agreement, these changes did not impact the interest rate on our Revolving Credit Agreement, which is the only debt arrangement with an interest rate that is subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. As of June 30, 2019, our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 4.4%.

For the rolling period of four quarters ending June 30, 2019, the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) could not exceed 5.00-to-1.00 and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00. The maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements may limit the amount we can borrow under the Revolving Credit Agreement to an amount less than the total amount available for borrowing. As of June 30, 2019, we had $853.5 million available for borrowing, and we believe that we are in compliance with the covenants in the Revolving Credit Agreement.

Receivables Financing Agreement

NuStar Energy and NuStar Finance LLC (NuStar Finance), a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $125.0 million receivables financing agreement with third-party lenders (the Receivables Financing

13

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (collectively with the Receivables Financing Agreement, the Securitization Program). On April 29, 2019, we amended the Receivables Financing Agreement to extend the scheduled termination date from September 20, 2020 to September 20, 2021 and to amend certain provisions with respect to receivables related to certain customers. NuStar Finance’s sole activity consists of purchasing receivables from NuStar Energy’s wholly owned subsidiaries that participate in the Securitization Program and providing these receivables as collateral for NuStar Finance’s revolving borrowings under the Securitization Program. NuStar Finance is a separate legal entity and the assets of NuStar Finance, including these accounts receivable, are not available to satisfy the claims of creditors of NuStar Energy, its subsidiaries selling receivables under the Securitization Program or their affiliates. The amount available for borrowing is based on the availability of eligible receivables and other customary factors and conditions.

Borrowings by NuStar Finance under the Receivables Financing Agreement bear interest at the applicable bank rate, as defined under the Receivables Financing Agreement. The weighted average interest rate related to outstanding borrowings under the Securitization Program as of June 30, 2019 was 3.3%. As of June 30, 2019, $100.3 million of our accounts receivable are included in the Securitization Program. The amount of borrowings outstanding under the Receivables Financing Agreement totaled $62.8 million as of June 30, 2019, which is included in “Long-term debt” on the consolidated balance sheet.

Issuance of Debt

On May 22, 2019, NuStar Logistics issued $500.0 million of 6.0% senior notes due June 1, 2026. We received net proceeds of approximately $491.7 million, which we initially used to repay outstanding borrowings under our Revolving Credit Agreement. The interest on the 6.0% senior notes is payable semi-annually in arrears on June 1 and December 1 of each year, beginning on December 1, 2019. The 6.0% senior notes do not have sinking fund requirements. These notes rank equally with existing senior unsecured indebtedness and senior to existing subordinated indebtedness of NuStar Logistics. The 6.0% senior notes contain restrictions on NuStar Logistics’ ability to incur secured indebtedness unless the same security is also provided for the benefit of holders of the senior notes. In addition, the senior notes limit NuStar Logistics’ ability to incur indebtedness secured by certain liens, engage in certain sale-leaseback transactions and engage in certain consolidations, mergers or asset sales. The 6.0% senior notes are fully and unconditionally guaranteed by NuStar Energy and NuPOP.

At the option of NuStar Logistics, the 6.0% senior notes may be redeemed in whole or in part at any time at a redemption price, plus accrued and unpaid interest to the redemption date. If we undergo a change of control, as defined in the supplemental indenture, each holder of the notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes repurchased, plus any accrued and unpaid interest to the date of repurchase.

6. COMMITMENTS AND CONTINGENCIES

We have contingent liabilities resulting from various litigation, claims and commitments. We record accruals for loss contingencies when losses are considered probable and can be reasonably estimated. Legal fees associated with defending the Partnership in legal matters are expensed as incurred. We accrued $2.8 million for contingent losses as of June 30, 2019 and December 31, 2018. The amount that will ultimately be paid related to such matters may differ from the recorded accruals, and the timing of such payments is uncertain. We evaluate each contingent loss at least quarterly, and more frequently as each matter progresses and develops over time, and we do not believe that the resolution of any particular claim or proceeding, or all matters in the aggregate, would have a material adverse effect on our results of operations, financial position or liquidity.

7. LEASE ASSETS AND LIABILITIES

Transition

On January 1, 2019, we adopted Accounting Standards Codification Topic 842, “Leases” (ASC Topic 842) using the modified retrospective method. Results for reporting periods beginning after January 1, 2019 are presented under ASC Topic 842. In accordance with the modified retrospective approach, prior period amounts were not adjusted and are reported under ASC Topic 840, “Leases.” As a result of the adoption of ASC Topic 842, we recorded right-of-use assets and lease liabilities of approximately $207.0 million and $192.0 million, respectively, as of January 1, 2019. The adoption of ASC Topic 842 had an immaterial impact on our results of operations and cash flows.

We elected the following practical expedients permitted under the transition guidance within the new standard:

• the package of practical expedients, which, among other things, allowed us to carry forward historical lease classification;

• the practical expedient specifically related to land easements, which, among other things, allowed us to carry forward our historical accounting treatment for existing land easement agreements;

14

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

• the lessee practical expedient to combine lease and non-lease components for all of our asset classes except the other pipeline and terminal equipment asset class; and

• the lessor practical expedient to combine lease and non-lease components and to account for the transaction based on the predominant component (i.e., ASC Topic 842 or ASC Topic 606, “Revenue from Contracts with Customers”). We apply this expedient to certain contracts in which we agree to provide both storage capacity and optional services to customers.

We record all leases on our consolidated balance sheet except for those leases with an initial term of 12 months or less, which are expensed on a straight-line basis over the lease term. We use judgment in determining the reasonably certain lease term and consider factors such as the nature and utility of the leased asset, as well as the importance of the leased asset to our operations. We calculate the present value of our lease liabilities based upon our incremental borrowing rate unless the rate implicit in the lease is readily determinable.

Lessee Arrangements

Our operating leases consist primarily of leases for tugs and barges utilized at the St. Eustatius facility for bunker fuel sales and land and dock leases at various terminal facilities. Tug and barge leases have remaining terms of 1 year to 9 years and include options to extend up to 10 years, and land and dock leases have remaining terms generally ranging from 3 years to 17 years and include options to extend up to 15 years. We are reasonably certain to exercise options to extend our land and dock leases.

The primary component of our finance lease portfolio is a dock at a terminal facility, which includes a commitment for minimum dockage and wharfage throughput volumes. The dock lease has a remaining initial term of 2 years and four additional five-year renewal periods, all of which we are reasonably certain to exercise. We historically accounted for the dock lease under legacy build-to-suit accounting guidance, which was eliminated by ASC Topic 842.

Certain of our leases are subject to variable payment arrangements, the most notable of which include:

• dockage and wharfage charges, which are based on volumes moved over leased docks and are included in our calculation of our lease payments based on minimum throughput volume requirements. We recognize charges on excess throughput volumes in profit or loss in the period in which the obligation for those payments is incurred; and

• consumer price index adjustments, which are measured and included in the calculation of our lease payments based on the consumer price index at the adoption date or, after adoption, at the commencement date. We recognize changes in lease payments as a result of changes in the consumer price index in profit or loss in the period in which those payments are made.

As of June 30, 2019, right-of-use assets and lease liabilities included in our consolidated balance sheet were as follows:

	Balance Sheet Location	June 30, 2019
		(Thousands of Dollars)
Right-of-Use Assets:
Operating	Other long-term assets, net	$	86,414
Operating	Assets held for sale	$	30,980
Finance	Property, plant and equipment, net of accumulated amortization of $1,741	$	73,982
Lease Liabilities:
Operating:
Current	Accrued liabilities	$	11,832
Current	Liabilities held for sale	31,681
Noncurrent	Other long-term liabilities	73,723
Total operating lease liabilities		$	117,236
Finance:
Current	Short-term debt and current portion of finance leases	$	4,087
Noncurrent	Long-term debt	55,241
Total finance lease liabilities		$	59,328

15

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

As of June 30, 2019, maturities of our operating and finance lease liabilities were as follows:

	Operating Leases		Finance Leases
	(Thousands of Dollars)
2019 (remaining)	$	13,042	$	3,022
2020	17,053		6,044
2021	13,180		4,594
2022	12,622		3,939
2023	11,654		3,896
Thereafter	79,789		63,281
Total lease payments	$	147,340	$	84,776
Less: Interest	30,104		25,448
Present value of lease liabilities	$	117,236	$	59,328

Costs incurred for leases were as follows:

	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
	(Thousands of Dollars)
Operating lease cost	$	9,477	$	18,941
Finance lease cost:
Amortization of right-of-use assets	900		1,741
Interest expense on lease liability	550		1,099
Short-term lease cost	5,609		9,923
Variable lease cost	977		1,788
Total lease cost	$	17,513	$	33,492

The table below presents additional information regarding our leases:

	Operating Leases			Finance Leases
	(Thousands of Dollars, Except Term and Rate Data)
For the six months ended June 30, 2019:
Cash outflows from operating activities	$	18,710		$	916
Cash outflows from financing activities				$	1,569
Right-of-use assets obtained in exchange for lease liabilities	$	1,352		$	1,452
As of June 30, 2019:
Weighted-average remaining lease term (in years)	13			22
Weighted-average discount rate	3.6		%	3.7		%

Lessor Arrangements

We have entered into certain revenue arrangements where we are considered to be the lessor. Under the largest of these arrangements, we lease certain of our storage tanks in exchange for a fixed fee, subject to an annual consumer price index adjustment. The operating leases commenced on January 1, 2017, and have initial terms of 10 years with successive automatic renewal terms. We recognized lease revenues from these leases of $20.4 million for the six months ended June 30, 2019, which are included in “Service revenues” in the consolidated statements of income. As of June 30, 2019, we expect to receive minimum lease payments totaling $293.0 million, based upon the consumer price index as of the adoption date. We will recognize these payments ratably over the remaining initial lease term. As of June 30, 2019, the cost and accumulated depreciation of lease storage assets, which are included in our “Pipeline, storage and terminals” asset class within property, plant and equipment and have an estimated useful life of 30 years, total $233.4 million and $117.3 million, respectively.

16

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

8. DERIVATIVES AND FAIR VALUE MEASUREMENTS

Derivative Instruments

We utilize various derivative instruments to manage our exposure to interest rate risk and commodity price risk. Our risk management policies and procedures are designed to monitor interest rates, futures and swap positions and over-the-counter positions, as well as physical commodity volumes, grades, locations and delivery schedules, to help ensure that our hedging activities address our market risks. Derivative financial instruments associated with commodity price risk with respect to our petroleum product inventories and related firm commitments to purchase and/or sell such inventories were not material for any periods presented.

Interest Rate Risk. We are a party to certain interest rate swap agreements to manage our exposure to changes in interest rates, which include forward-starting interest rate swap agreements related to a forecasted debt issuance in 2020. We entered into these swaps in order to hedge the risk of fluctuations in the required interest payments attributable to changes in the benchmark interest rate during the period from the effective date of the swap to the issuance of the forecasted debt. Under the terms of the swaps, we pay a fixed rate and receive a rate based on the three-month USD LIBOR. These swaps qualify as cash flow hedges, and we designate them as such. We record the effective portion of mark-to-market adjustments as a component of “Accumulated other comprehensive 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 June 30, 2019 and December 31, 2018, the aggregate notional amount of forward-starting interest rate swaps totaled $250.0 million.

The fair values of our interest rate swaps included in our consolidated balance sheets were as follows:

	Asset Derivatives				Liability Derivatives
Balance Sheet Location	June 30, 2019		December 31, 2018		June 30, 2019			December 31, 2018
	(Thousands of Dollars)
Other long-term assets, net	$	—	$	627	$	—		$	—
Other long-term liabilities	$	—	$	—	$	(16,716	)	$	(751	)

Our interest rate swaps had the following impact on earnings:

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars)
(Loss) gain recognized in other comprehensive income (loss) on derivative	$	(9,784	)	$	5,106		$	(16,592	)	$	22,527
Loss reclassified from AOCI into interest expense, net	$	(1,005	)	$	(1,162	)	$	(2,083	)	$	(2,552	)

As of June 30, 2019, we expect to reclassify a loss of $3.0 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

Fair Value Measurements

We segregate the inputs used in measuring fair value into three levels: Level 1, defined as observable inputs, such as quoted prices for identical assets or liabilities in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets that are not active; and Level 3, defined as unobservable inputs for which little or no market data exists. We consider counterparty credit risk and our own credit risk in the determination of all estimated fair values.

Recurring Fair Value Measurements. Because we estimate the fair value of our forward-starting interest rate swaps using discounted cash flows, which use observable inputs such as time to maturity and market interest rates, we include interest rate swaps in Level 2 of the fair value hierarchy.

Non-recurring Fair Value Measurements. Please refer to Note 3 for a discussion of the non-recurring fair value measurement associated with the impairment of long-lived assets related to our St. Eustatius terminal.

17

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Fair Value of Financial Instruments

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

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Fair value	$	3,473,806	$	3,056,704
Carrying amount	$	3,401,220	$	3,111,996

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

9. SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

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

In July 2019, our board of directors declared distributions of $0.619 per Series D Preferred Unit to be paid on September 16, 2019.

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.

10. PARTNERS' EQUITY

Series A, B and C Preferred Units

We allocate net income to our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively, the Series A, B and C Preferred Units) based on their respective rights to receive distributions earned during the period. Distributions on our Series A, B and C Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month as follows (until the distribution rate changes to a floating rate):

Units	Fixed Distribution Rate Per Unit Per Quarter		Fixed Distribution Per Quarter		Date at Which Distribution Rate Becomes Floating
			(Thousands of Dollars)
Series A Preferred Units	$	0.53125	$	4,813	December 15, 2021
Series B Preferred Units	$	0.47657	$	7,339	June 15, 2022
Series C Preferred Units	$	0.56250	$	3,881	December 15, 2022

In July 2019, our board of directors declared distributions with respect to the Series A, B and C Preferred Units to be paid on September 16, 2019.

18

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Common Limited Partners

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

The following table summarizes information about quarterly cash distributions declared for our common limited partners:

Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
June 30, 2019	$	0.60	$	64,658	August 7, 2019	August 13, 2019
March 31, 2019	$	0.60	$	64,690	May 8, 2019	May 14, 2019

Accumulated Other Comprehensive Income (Loss)

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

	Foreign Currency Translation			Cash Flow Hedges			Pension and Other Postretirement Benefits			Total
	(Thousands of Dollars)
Balance as of January 1, 2019	$	(47,299	)	$	(893	)	$	(6,686	)	$	(54,878	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassification adjustments	2,868			(16,592		)	—			(13,724		)
Net gain on pension costs reclassified into other income, net	—			—			(1,157		)	(1,157		)
Net loss on cash flow hedges reclassified into interest expense, net	—			2,083			—			2,083
Other	—			—			13			13
Other comprehensive income (loss)	2,868			(14,509		)	(1,144		)	(12,785		)
Balance as of June 30, 2019	$	(44,431	)	$	(15,402	)	$	(7,830	)	$	(67,663	)

11. NET INCOME (LOSS) PER COMMON UNIT

Basic net income (loss) per common unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partners and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include restricted units awarded under our long-term incentive plans. We compute basic net income (loss) per common unit by dividing net (loss) income attributable to common units by the weighted-average number of common units outstanding during the period.

Diluted net income (loss) per common unit is computed by dividing net income (loss) attributable to common units by the sum of (i) the weighted average number of common units outstanding during the period and (ii) the effect of dilutive potential common units outstanding during the period. Dilutive potential common units may include contingently issuable performance unit awards and the Series D Preferred Units.

The Series D Preferred Units are convertible into common units at the option of the holder at any time on or after June 29, 2028. As such, we calculated the dilutive effect of the Series D Preferred Units using the if-converted method. The effect of the assumed conversion of the Series D Preferred Units outstanding as of the end of each period presented was antidilutive; therefore, we did not include such conversion in the computation of diluted net income (loss) per common unit.

19

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income (loss)	$	45,951		$	29,399		$	(231,912	)	$	155,532
Distributions to preferred limited partners	(30,423		)	(16,245		)	(60,846		)	(32,235		)
Distributions to general partner	—			—			—			(1,141		)
Distributions to common limited partners	(64,658		)	(64,205		)	(129,348		)	(120,121		)
Distribution equivalent rights to restricted units	(642		)	(480		)	(1,285		)	(925		)
Distributions (in excess of) less than income (loss)	$	(49,772	)	$	(51,531	)	$	(423,391	)	$	1,110
Distributions to common limited partners	$	64,658		$	64,205		$	129,348		$	120,121
Allocation of distributions (in excess of) less than income (loss)	(49,772		)	(50,500		)	(423,391		)	1,079
Series D Preferred Unit accretion	(4,446		)	—			(8,748		)	—
Net income (loss) attributable to common units	$	10,440		$	13,705		$	(302,791	)	$	121,200
Basic weighted-average common units outstanding	107,763,016			93,192,238			107,647,957			93,187,038
Basic net income (loss) per common unit	$	0.10		$	0.15		$	(2.81	)	$	1.30

12. STATEMENTS OF CASH FLOWS

Changes in current assets and current liabilities were as follows:

	Six Months Ended June 30,
	2019			2018
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	(3,146	)	$	34,518
Receivable from related party	—			130
Inventories	1,551			(1,233		)
Other current assets	(4,075		)	(2,494		)
Increase (decrease) in current liabilities:
Accounts payable	7,704			5,149
Accrued interest payable	2,636			(4,325		)
Accrued liabilities	(34,814		)	10,476
Taxes other than income tax	(3,556		)	1,329
Income tax payable	(2,529		)	(817		)
Changes in current assets and current liabilities	$	(36,229	)	$	42,733

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

• the change in the amount accrued for capital expenditures;

• the effect of foreign currency translation;

• changes in the fair values of our interest rate swap agreements;

• the recognition of lease liabilities upon the adoption of ASC Topic 842; and

• the reclassification of certain assets and liabilities to “Assets held for sale” and “Liabilities held for sale” on the consolidated balance sheets (please refer to Note 3 for additional discussion).

20

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

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

	Six Months Ended June 30,
	2019		2018
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	84,677	$	96,761
Cash paid for income taxes, net of tax refunds received	$	6,557	$	7,973

As of June 30, 2019, restricted cash is included in "Prepaid and other current assets" on the consolidated balance sheet. “Cash, cash equivalents and restricted cash” on the consolidated statements of cash flows were included in the consolidated balance sheets as follows:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Cash and cash equivalents	$	15,299	$	11,529
Prepaid and other current assets	8,744		—
Assets held for sale	839		2,115
Cash, cash equivalents and restricted cash	$	24,882	$	13,644

13. EMPLOYEE BENEFIT PLANS AND UNIT-BASED COMPENSATION

Employee Benefit Plans

NuStar’s Pension Plan is a qualified non-contributory defined benefit pension plan that provides eligible U.S. employees with retirement income as calculated under a cash balance formula. NuStar’s Excess Pension Plan is a nonqualified deferred compensation plan that provides benefits to a select group of management or other highly compensated employees. The Pension Plan and Excess Pension Plan are collectively referred to as the Pension Plans.

Our other postretirement benefit plans include a contributory medical benefits plan for U.S. employees who retired prior to April 1, 2014, and for employees who retire on or after April 1, 2014, a partial reimbursement for eligible third-party health care premiums.

21

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

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

	Pension Plans						Other Postretirement Benefit Plans
	2019			2018			2019			2018
	(Thousands of Dollars)
For the three months ended June 30:
Service cost	$	2,387		$	2,405		$	108		$	126
Interest cost	1,370			1,206			113			107
Expected return on assets	(2,003		)	(1,854		)	—			—
Amortization of prior service credit	(514		)	(514		)	(286		)	(286		)
Amortization of net loss	212			543			10			53
Net periodic benefit cost (income)	$	1,452		$	1,786		$	(55	)	$	—
For the six months ended June 30:
Service cost	$	4,775		$	4,811		$	215		$	252
Interest cost	2,740			2,412			227			215
Expected return on assets	(4,007		)	(3,709		)	—			—
Amortization of prior service credit	(1,028		)	(1,028		)	(573		)	(573		)
Amortization of net loss	423			1,087			21			107
Net periodic benefit cost (income)	$	2,903		$	3,573		$	(110	)	$	1

The service cost component of net periodic benefit cost (income) is presented in the same income statement line items as other current employee compensation costs, but the remaining components of net periodic benefit cost (income) are reported on the consolidated statements of comprehensive income in “Other income, net.”

Unit-Based Compensation

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

14. 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.

22

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Results of operations for the reportable segments were as follows:

	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019			2018
	(Thousands of Dollars)
Revenues:
Pipeline	$	172,493	$	150,276		$	328,744		$	287,066
Storage:
Third parties	110,403		114,687			213,899			225,966
Intersegment	—		133			4			274
Total storage	110,403		114,820			213,903			226,240
Fuels marketing	89,549		124,293			177,628			252,951
Consolidation and intersegment eliminations	—		(133		)	(4		)	(274		)
Total revenues	$	372,445	$	389,256		$	720,271		$	765,983
Operating income:
Pipeline	$	78,712	$	62,979		$	146,016		$	120,773
Storage	38,098		38,781			70,316			81,868
Fuels marketing	3,160		3,536			5,085			6,332
Consolidation and intersegment eliminations	—		3			(32		)	—
Total segment operating income	119,970		105,299			221,385			208,973
General and administrative expenses	24,868		26,754			50,559			44,896
Other depreciation and amortization expense	1,819		2,158			3,938			4,197
Total operating income	$	93,283	$	76,387		$	166,888		$	159,880

Total assets by reportable segment were as follows:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Pipeline	$	3,824,047	$	3,637,226
Storage	2,028,427		1,902,764
Fuels marketing	39,893		37,252
Total segment assets	5,892,367		5,577,242
Assets held for sale	301,529		599,347
Other partnership assets	185,795		172,551
Total consolidated assets	$	6,379,691	$	6,349,140

23

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

15. CONDENSED CONSOLIDATING FINANCIAL STATEMENTS

NuStar Energy has no operations, and its assets consist mainly of its investments in 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

June 30, 2019

(Thousands of Dollars)

	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	486	$	332	$	—	$	14,481	$	—		$	15,299
Receivables, net	—		1,692		—		115,996		—			117,688
Inventories	—		1,924		3,169		4,361		—			9,454
Prepaid and other current assets	110		25,619		1,059		2,803		—			29,591
Assets held for sale	—		—		—		301,529		—			301,529
Intercompany receivable	—		1,462,583		—		397,269		(1,859,852		)	—
Total current assets	596		1,492,150		4,228		836,439		(1,859,852		)	473,561
Property, plant and equipment, net	—		2,023,613		609,798		1,387,403		—			4,020,814
Intangible assets, net	—		44,395		—		662,949		—			707,344
Goodwill	—		149,453		170,652		685,748		—			1,005,853
Investment in wholly owned subsidiaries	2,934,489		1,713,256		1,135,618		514,958		(6,298,321		)	—
Other long-term assets, net	57		103,408		32,557		36,097		—			172,119
Total assets	$	2,935,142	$	5,526,275	$	1,952,853	$	4,123,594	$	(8,158,173	)	$	6,379,691
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	$	5,586	$	51,193	$	6,287	$	65,481	$	—		$	128,547
Short-term debt and current portion of finance leases	—		9,940		131		16		—			10,087
Accrued interest payable	—		38,891		—		38		—			38,929
Accrued liabilities	866		28,558		8,942		31,604		—			69,970
Taxes other than income tax	8		6,090		5,955		2,007		—			14,060
Income tax payable	—		217		1		1,702		—			1,920
Liabilities held for sale	—		—		—		68,616		—			68,616
Intercompany payable	459,119		—		1,400,733		—		(1,859,852		)	—
Total current liabilities	465,579		134,889		1,422,049		169,464		(1,859,852		)	332,129
Long-term debt	—		3,393,447		512		62,502		—			3,456,461
Deferred income tax liability	—		1,675		9		10,566		—			12,250
Other long-term liabilities	—		88,772		15,471		72,708		—			176,951
Series D preferred units	572,597		—		—		—		—			572,597
Total partners’ equity	1,896,966		1,907,492		514,812		3,808,354		(6,298,321		)	1,829,303
Total liabilities, mezzanine equity and partners’ equity	$	2,935,142	$	5,526,275	$	1,952,853	$	4,123,594	$	(8,158,173	)	$	6,379,691

24

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Condensed Consolidating Balance Sheets

December 31, 2018

(Thousands of Dollars)

	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	1,255	$	51	$	—	$	10,223	$	—		$	11,529
Receivables, net	—		2,212		—		108,205		—			110,417
Inventories	—		1,741		5,237		1,456		—			8,434
Prepaid and other current assets	61		14,422		908		1,983		—			17,374
Assets held for sale	—		—		—		599,347		—			599,347
Intercompany receivable	—		1,327,833		—		500,583		(1,828,416		)	—
Total current assets	1,316		1,346,259		6,145		1,221,797		(1,828,416		)	747,101
Property, plant and equipment, net	—		1,858,264		615,549		1,300,989		—			3,774,802
Intangible assets, net	—		49,107		—		683,949		—			733,056
Goodwill	—		149,453		170,652		685,748		—			1,005,853
Investment in wholly owned subsidiaries	3,355,636		1,750,256		1,425,283		857,485		(7,388,660		)	—
Other long-term assets, net	304		54,429		26,716		6,879		—			88,328
Total assets	$	3,357,256	$	5,207,768	$	2,244,345	$	4,756,847	$	(9,217,076	)	$	6,349,140
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	$	6,460	$	39,680	$	6,331	$	50,651	$	—		$	103,122
Short-term debt	—		18,500		—		—		—			18,500
Accrued interest payable	—		36,253		—		40		—			36,293
Accrued liabilities	1,280		24,858		8,082		40,198		—			74,418
Taxes other than income tax	125		7,285		4,718		4,695		—			16,823
Income tax payable	—		457		2		3,986		—			4,445
Liabilities held for sale	—		—		—		69,834		—			69,834
Intercompany payable	472,790		—		1,355,626		—		(1,828,416		)	—
Total current liabilities	480,655		127,033		1,374,759		169,404		(1,828,416		)	323,435
Long-term debt	—		3,050,531		—		61,465		—			3,111,996
Deferred income tax liability	—		1,675		9		10,744		—			12,428
Other long-term liabilities	—		28,392		12,348		38,818		—			79,558
Series D preferred units	563,992		—		—		—		—			563,992
Total partners’ equity	2,312,609		2,000,137		857,229		4,476,416		(7,388,660		)	2,257,731
Total liabilities, mezzanine equity and partners’ equity	$	3,357,256	$	5,207,768	$	2,244,345	$	4,756,847	$	(9,217,076	)	$	6,349,140

25

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Condensed Consolidating Statements of Comprehensive Income

For the Three Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	130,136		$	64,452		$	178,042		$	(185	)	$	372,445
Costs and expenses	699			83,029			41,235			154,384			(185		)	279,162
Operating (loss) income	(699		)	47,107			23,217			23,658			—			93,283
Equity in earnings of subsidiaries	47,499			10,990			13,785			35,339			(107,613		)	—
Interest income (expense), net	117			(47,016		)	(1,840		)	3,046			—			(45,693		)
Other income (expense), net	—			743			178			(300		)	—			621
Income from continuing operations before income tax expense (benefit)	46,917			11,824			35,340			61,743			(107,613		)	48,211
Income tax expense (benefit)	2			(469		)	1			1,762			—			1,296
Income from continuing operations, net of tax	46,915			12,293			35,339			59,981			(107,613		)	46,915
(Loss) income from discontinued operations, net of tax (a)	(964		)	7,912			(8,877		)	(17,752		)	18,717			(964		)
Net income	$	45,951		$	20,205		$	26,462		$	42,229		$	(88,896	)	$	45,951
Comprehensive income	$	45,951		$	11,426		$	26,462		$	43,049		$	(88,896	)	$	37,992

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Comprehensive Income (Loss)

For the Three Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	117,862		$	66,505		$	205,036		$	(147	)	$	389,256
Costs and expenses	538			86,588			42,324			183,566			(147		)	312,869
Operating (loss) income	(538		)	31,274			24,181			21,470			—			76,387
Equity in earnings of subsidiaries	27,410			1,692			20,655			43,183			(92,940		)	—
Interest income (expense), net	37			(50,357		)	(1,724		)	3,655			—			(48,389		)
Other income (expense), net	—			1,848			73			(314		)	—			1,607
Income (loss) from continuing operations before income tax expense	26,909			(15,543		)	43,185			67,994			(92,940		)	29,605
Income tax expense	—			61			—			2,635			—			2,696
Income (loss) from continuing operations, net of tax	26,909			(15,604		)	43,185			65,359			(92,940		)	26,909
Income from discontinued operations, net of tax (a)	2,490			—			2,490			4,980			(7,470		)	2,490
Net income (loss)	$	29,399		$	(15,604	)	$	45,675		$	70,339		$	(100,410	)	$	29,399
Comprehensive income (loss)	$	29,399		$	(9,336	)	$	45,675		$	61,450		$	(100,410	)	$	26,778

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

26

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Condensed Consolidating Statements of Comprehensive (Loss) Income

For the Six Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	247,691		$	122,805		$	350,147		$	(372	)	$	720,271
Costs and expenses	1,375			160,440			77,285			314,655			(372		)	553,383
Operating (loss) income	(1,375		)	87,251			45,520			35,492			—			166,888
Equity in earnings of subsidiaries	76,990			12,329			26,523			68,624			(184,466		)	—
Interest income (expense), net	225			(92,472		)	(3,773		)	6,036			—			(89,984		)
Other income (expense), net	—			1,497			355			(440		)	—			1,412
Income from continuing operations before income tax expense (benefit)	75,840			8,605			68,625			109,712			(184,466		)	78,316
Income tax expense (benefit)	2			(352		)	1			2,827			—			2,478
Income from continuing operations, net of tax	75,838			8,957			68,624			106,885			(184,466		)	75,838
(Loss) income from discontinued operations, net of tax (a)	(307,750		)	7,912			(315,663		)	(631,324		)	939,075			(307,750		)
Net (loss) income	(231,912		)	16,869			(247,039		)	(524,439		)	754,609			(231,912		)
Comprehensive (loss) income	$	(231,912	)	$	2,360		$	(247,039	)	$	(522,715	)	$	754,609		$	(244,697	)

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Comprehensive Income

For the Six Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries		Eliminations			Consolidated
Revenues	$	—		$	237,556		$	122,779		$	405,997	$	(349	)	$	765,983
Costs and expenses	1,150			159,004			77,505			368,793		(349		)	606,103
Operating (loss) income	(1,150		)	78,552			45,274			37,204		—			159,880
Equity in earnings (loss) of subsidiaries	61,223			(557		)	39,758			81,922		(182,346		)	—
Interest income (expense), net	69			(100,383		)	(3,295		)	7,832		—			(95,777		)
Other income, net	—			2,324			188			111		—			2,623
Income (loss) from continuing operations before income tax expense	60,142			(20,064		)	81,925			127,069		(182,346		)	66,726
Income tax expense	—			231			1			6,352		—			6,584
Income (loss) from continuing operations, net of tax	60,142			(20,295		)	81,924			120,717		(182,346		)	60,142
Income from discontinued operations, net of tax (a)	95,390			—			95,390			190,780		(286,170		)	95,390
Net income (loss)	$	155,532		$	(20,295	)	$	177,314		$	311,497	$	(468,516	)	$	155,532
Comprehensive income	$	155,532		$	4,784		$	177,314		$	304,721	$	(468,516	)	$	173,835

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

27

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Condensed Consolidating Statements of Cash Flows

For the Six Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	187,265		$	77,144		$	60,539		$	200,762		$	(284,816	)	$	240,894
Cash flows from investing activities:
Capital expenditures	—			(167,647		)	(9,131		)	(143,183		)	—			(319,961		)
Change in accounts payable related to capital expenditures	—			11,708			522			3,914			—			16,144
Proceeds from sale or disposition of assets	—			71			26			46			—			143
Investment in subsidiaries	—			(11,999		)	—			—			11,999			—
Net cash used in investing activities	—			(167,867		)	(8,583		)	(139,223		)	11,999			(303,674		)
Cash flows from financing activities:
Debt borrowings	—			570,500			—			23,800			—			594,300
Debt repayments	—			(785,000		)	—			(22,800		)	—			(807,800		)
Note offering, net of issuance costs	—			491,665			—			—			—			491,665
Distributions to preferred unitholders	(60,846		)	(30,424		)	(30,423		)	(30,425		)	91,272			(60,846		)
Distributions to common unitholders	(129,025		)	(64,512		)	(64,512		)	(64,520		)	193,544			(129,025		)
Contributions from affiliates	—			—			—			11,999			(11,999		)	—
Net intercompany activity	9,641			(75,900		)	43,009			23,250			—			—
Payment of tax withholding for unit-based compensation	(6,368		)	—			—			—			—			(6,368		)
Other, net	(1,436		)	(6,581		)	(30		)	(122		)	—			(8,169		)
Net cash (used in) provided by financing activities	(188,034		)	99,748			(51,956		)	(58,818		)	272,817			73,757
Effect of foreign exchange rate changes on cash	—			—			—			261			—			261
Net (decrease) increase in cash, cash equivalents and restricted cash	(769		)	9,025			—			2,982			—			11,238
Cash, cash equivalents, and restricted cash as of the beginning of the period	1,255			51			—			12,338			—			13,644
Cash, cash equivalents and restricted cash as of the end of the period	$	486		$	9,076		$	—		$	15,320		$	—		$	24,882

28

NUSTAR ENERGY L.P. AND SUBSIDIARIES

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

Condensed Consolidating Statements of Cash Flows

For the Six Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	200,803		$	31,209		$	58,105		$	261,300		$	(307,567	)	$	243,850
Cash flows from investing activities:
Capital expenditures	—			(17,136		)	(8,164		)	(223,221		)	—			(248,521		)
Change in accounts payable related to capital expenditures	—			495			(5,173		)	(14,642		)	—			(19,320		)
Proceeds from sale or disposition of assets	—			1,385			16			696			—			2,097
Proceeds from insurance recoveries	—			—			—			78,419			—			78,419
Acquisitions	—			—			(37,502		)	—			—			(37,502		)
Net cash used in investing activities	—			(15,256		)	(50,823		)	(158,748		)	—			(224,827		)
Cash flows from financing activities:
Debt borrowings	—			1,122,272			—			11,000			—			1,133,272
Debt repayments	—			(1,316,621		)	—			(16,900		)	—			(1,333,521		)
Issuance of Series D preferred units	400,000			—			—			—			—			400,000
Payment of issuance costs for Series D preferred units	(29,289		)	—			—			—			—			(29,289		)
Issuance of common units	10,000			—			—			—			—			10,000
Distributions to preferred unitholders	(32,713		)	(16,356		)	(16,357		)	(16,358		)	49,071			(32,713		)
Distributions to common unitholders and general partner	(172,324		)	(86,162		)	(86,162		)	(86,172		)	258,496			(172,324		)
Proceeds from termination of interest rate swaps	—			8,048			—			—			—			8,048
Net intercompany activity	(374,973		)	279,080			95,237			656			—			—
Other, net	(1,493		)	(4,466		)	—			(64		)	—			(6,023		)
Net cash used in financing activities	(200,792		)	(14,205		)	(7,282		)	(107,838		)	307,567			(22,550		)
Effect of foreign exchange rate changes on cash	—			—			—			(421		)	—			(421		)
Net increase (decrease) in cash and cash equivalents	11			1,748			—			(5,707		)	—			(3,948		)
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	$	896		$	1,777		$	—		$	17,671		$	—		$	20,344

29

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

In this Form 10-Q, we make certain forward-looking statements, including statements regarding our plans, strategies, objectives, expectations, estimates, predictions, projections, assumptions, intentions and resources. While these forward-looking statements, and any assumptions upon which they are based, are made in good faith and reflect our current judgment regarding the direction of our business, actual results will almost always vary, sometimes materially, from any estimates, predictions, projections, assumptions or other future performance suggested in this report. These forward-looking statements can generally be identified by the words “anticipates,” “believes,” “expects,” “plans,” “intends,” “estimates,” “forecasts,” “budgets,” “projects,” “will,” “could,” “should,” “may” and similar expressions. These statements reflect our current views with regard to future events and are subject to various risks, uncertainties and assumptions, which may cause actual results to differ materially. Please read our Annual Report on Form 10-K for the year ended December 31, 2018, Part I, Item 1A “Risk Factors,” as well as our subsequent filings with the Securities and Exchange Commission, for a discussion of certain of those risks, uncertainties and assumptions.

If one or more of these risks or uncertainties materialize, or if the underlying assumptions prove incorrect, our actual results may vary materially from those described in any forward-looking statement. Other unknown or unpredictable factors could also have material adverse effects on our future results. Readers are cautioned not to place undue reliance on this forward-looking information, which is as of the date of this Form 10-Q. We do not intend to update these statements unless we are required by the securities laws to do so, and we undertake no obligation to publicly release the result of any revisions to any such forward-looking statements that may be made to reflect events or circumstances after the date of this report or to reflect the occurrence of unanticipated events.

OVERVIEW

NuStar Energy L.P. (NYSE: NS) is 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.

Our Management’s Discussion and Analysis of Financial Condition and Results of Operations is presented in six sections:

• Overview

• Results of Operations

• Trends and Outlook

• Liquidity and Capital Resources

• Critical Accounting Policies

• New Accounting Pronouncements

Recent Developments

Issuance of Debt. On May 22, 2019, NuStar Logistics issued $500.0 million of 6.0% senior notes due June 1, 2026. We received net proceeds of approximately $491.7 million, which we initially used to repay outstanding borrowings under our revolving credit agreement. Please refer to Note 5 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for further information.

Sale of St. Eustatius Operations. On May 9, 2019, we entered into a Share Purchase and Sale Agreement to sell the equity interests in our wholly owned subsidiaries that own the St. Eustatius terminal and bunkering operations (the St. Eustatius Operations) for approximately $250.0 million, subject to adjustment (the St. Eustatius Disposition). The St. Eustatius Disposition included a 14.3 million barrel storage and terminalling facility and related assets on the island of St. Eustatius in the Caribbean Netherlands. We closed the sale on July 29, 2019 and received net proceeds of approximately $234.0 million. We previously reported the terminal operations in our storage segment and the bunkering operations in our fuels marketing segment.

The unaudited consolidated balance sheets reflect the assets and liabilities associated with the St. Eustatius Operations as held for sale for all periods presented, and the unaudited condensed consolidated statements of comprehensive income reflect the St. Eustatius Operations and the European Operations, which were sold on November 30, 2018 and defined below, as discontinued operations for all applicable periods presented. The consolidated statements of cash flows have not been adjusted to separately

30

disclose cash flows related to discontinued operations. Please refer to Note 3 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for additional information on discontinued operations.

In the first quarter of 2019, we recorded long-lived asset and goodwill impairment charges of $297.3 million and $31.1 million, respectively, related to the St. Eustatius Operations. We recorded an additional impairment charge of $8.4 million in the second quarter of 2019 due to additional capital expenditures incurred. The impairment charges are recorded in discontinued operations. Please refer to Note 3 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for further discussion of the impairment charges.

Other Events

Sale of European Operations. On November 30, 2018, we sold our European operations, which consisted of six liquids storage terminals in the United Kingdom and one facility in Amsterdam and related assets (the European Operations), for approximately $270.0 million (the European Disposition). We previously reported the European Operations in our storage segment.

Merger. On July 20, 2018, we completed the merger of NuStar GP Holdings, LLC with a subsidiary of NS. Consequently, NSH, which indirectly owns our general partner, became a wholly owned subsidiary of ours. Under the terms of the merger agreement, NSH unitholders received 0.55 of a common unit representing a limited partner interest in NS in exchange for each NSH unit owned at the effective time of the merger, resulting in approximately 13.4 million incremental NS common units outstanding after the merger.

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, within the East Pipeline, from the date of acquisition. We accounted for this acquisition as an asset purchase.

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 the St. Eustatius terminal, which experienced the most damage and was temporarily shut down. In January 2018, we received $87.5 million of insurance proceeds in settlement of our property damage claim for the St. Eustatius terminal, of which $9.1 million related to business interruption, which is included in “Cash flows from operating activities” in the consolidated statements of cash flows. We recorded a $78.8 million gain 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. The insurance proceeds related to business interruption and the gain are included in “(Loss) income from discontinued operations, net of tax” in the consolidated statements of income.

Operations

We conduct our operations through our subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). Our operations consist of three reportable business segments: pipeline, storage and fuels marketing.

Pipeline. We own 3,130 miles of refined product pipelines and 2,120 miles of crude oil pipelines, as well as 5.2 million barrels of storage capacity, which comprise our Central West System. In addition, we own 2,600 miles of refined product pipelines, consisting of the East and North Pipelines, and a 2,000-mile ammonia pipeline (the Ammonia Pipeline), which comprise our Central East System. The East and North Pipelines have storage capacity of 7.4 million barrels. We charge tariffs on a per barrel basis for transporting refined products, crude oil and other feedstocks in our refined product and crude oil pipelines and on a per ton basis for transporting anhydrous ammonia in the Ammonia Pipeline.

Storage. Our storage segment includes the operations of our terminal and storage facilities in the United States, Canada and Mexico, with 61.5 million barrels of storage capacity. 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).

Fuels Marketing. Within our fuels marketing operations, we purchase petroleum products for resale. The results of operations for the fuels marketing segment depend largely on the margin between our costs and the sales prices of the products we market. Therefore, the results of operations for this segment are more sensitive to changes in commodity prices compared to the operations of the pipeline and storage segments. Although we enter into derivative contracts to attempt to mitigate the effects of commodity price fluctuations, the derivative financial instruments associated with commodity price risk were not material for

31

any periods presented. The operations in our fuels marketing segment include our bunkering operations in the Gulf Coast, as well as certain of our blending operations at our Central East System.

Factors That Affect Results of Operations

The following factors affect the results of our operations:

• company-specific factors, such as facility integrity issues and maintenance requirements that impact the throughput rates of our assets;

• seasonal factors that affect the demand for products transported by and/or stored in our assets and the demand for products we sell;

• industry factors, such as changes in the prices of petroleum products that affect demand and the operations of our competitors;

• economic factors, such as commodity price volatility, that impact our fuels marketing segment; and

• factors that impact the operations served by our pipeline and storage assets, such as utilization rates and maintenance turnaround schedules of our refining company customers and drilling activity by our crude oil production customers.

Increases or decreases in the price of crude oil affect sectors across the energy industry, including our customers in crude oil production, refining and trading, in different ways at different points in any given price cycle. For example, during periods of sustained low prices, producers tend to reduce their capital spending and drilling activity and narrow their focus to assets in the most cost-advantaged regions. Refiners, on the other hand, tend to benefit from lower crude oil prices, to the extent they are able to take advantage of lower feedstock prices, especially those positioned for healthy regional demand for their refined products; however, as refined product inventories increase, refiners typically reduce their production rate, which may reduce the degree to which they are able to benefit from low crude prices. Crude oil traders focus less on the current market commodity price than on whether that price is higher or lower than expected future market prices: if the future price for a product is believed to be higher than the current market price, or a “contango market,” traders are more likely to purchase and store products to sell in the future at the higher price. On the other hand, when the current price of crude oil nears or exceeds the expected future market price, or “backwardation,” as is currently the case for certain markets that we serve, traders are no longer incentivized to purchase and store product for future sale.

32

RESULTS OF OPERATIONS

Three Months Ended June 30, 2019 Compared to Three Months Ended June 30, 2018

Financial Highlights

(Unaudited, Thousands of Dollars, Except Per Unit Data)

	Three Months Ended June 30,						Change
	2019			2018
Statement of Income Data:
Revenues:
Service revenues	$	282,472		$	259,599		$	22,873
Product sales	89,973			129,657			(39,684		)
Total revenues	372,445			389,256			(16,811		)
Costs and expenses:
Costs associated with service revenues	166,086			164,018			2,068
Cost of product sales	86,389			119,939			(33,550		)
General and administrative expenses	24,868			26,754			(1,886		)
Other depreciation and amortization expense	1,819			2,158			(339		)
Total costs and expenses	279,162			312,869			(33,707		)
Operating income	93,283			76,387			16,896
Interest expense, net	(45,693		)	(48,389		)	2,696
Other income, net	621			1,607			(986		)
Income from continuing operations before income tax expense	48,211			29,605			18,606
Income tax expense	1,296			2,696			(1,400		)
Income from continuing operations, net of tax	46,915			26,909			20,006
(Loss) income from discontinued operations, net of tax	(964		)	2,490			(3,454		)
Net income	$	45,951		$	29,399		$	16,552
Basic net income (loss) per common unit:
Continuing operations	$	0.11		$	0.12		$	(0.01	)
Discontinued operations	(0.01		)	0.03			(0.04		)
Total	$	0.10		$	0.15		$	(0.05	)

Overview

Net income increased $16.6 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, mainly due to higher operating income from our pipeline segment.

33

Segment Operating Highlights

(Thousands of Dollars, Except Barrels/Day Information)

	Three Months Ended June 30,					Change
	2019		2018
Pipeline:
Crude oil pipelines throughput (barrels/day)	1,089,848		839,574			250,274
Refined products and ammonia pipelines throughput (barrels/day)	569,820		565,740			4,080
Total throughput (barrels/day)	1,659,668		1,405,314			254,354
Throughput revenues	$	172,493	$	150,276		$	22,217
Operating expenses	52,930		48,706			4,224
Depreciation and amortization expense	40,851		38,591			2,260
Segment operating income	$	78,712	$	62,979		$	15,733
Storage:
Throughput (barrels/day)	395,512		331,917			63,595
Throughput terminal revenues	$	23,170	$	20,141		$	3,029
Storage terminal revenues	87,233		94,679			(7,446		)
Total revenues	110,403		114,820			(4,417		)
Operating expenses	48,165		52,853			(4,688		)
Depreciation and amortization expense	24,140		23,186			954
Segment operating income	$	38,098	$	38,781		$	(683	)
Fuels Marketing:
Product sales and other revenue	$	89,549	$	124,293		$	(34,744	)
Cost of goods	85,802		119,942			(34,140		)
Gross margin	3,747		4,351			(604		)
Operating expenses	587		815			(228		)
Segment operating income	$	3,160	$	3,536		$	(376	)
Consolidation and Intersegment Eliminations:
Revenues	$	—	$	(133	)	$	133
Cost of goods	—		(3		)	3
Operating expenses	—		(133		)	133
Total	$	—	$	3		$	(3	)
Consolidated Information:
Revenues	$	372,445	$	389,256		$	(16,811	)
Costs associated with service revenues:
Operating expenses	101,095		102,241			(1,146		)
Depreciation and amortization expense	64,991		61,777			3,214
Total costs associated with service revenues	166,086		164,018			2,068
Cost of product sales	86,389		119,939			(33,550		)
Segment operating income	119,970		105,299			14,671
General and administrative expenses	24,868		26,754			(1,886		)
Other depreciation and amortization expense	1,819		2,158			(339		)
Consolidated operating income	$	93,283	$	76,387		$	16,896

34

Pipeline

Total revenues increased $22.2 million and throughputs increased 254,354 barrels per day for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, primarily due to:

• an increase in revenues of $14.1 million and an increase in throughputs of 115,286 barrels per day resulting from increased customer production supplying our Permian Crude System and the completion of new pipeline connections and expansion projects;

• an increase in revenues of $3.2 million and an increase in throughputs of 2,384 barrels per day on our Ardmore System, mainly due to an increase in long-haul deliveries resulting in higher average tariffs and the completion of new pipeline connections that began delivering incremental Permian crude oil in the second quarter of 2019 from Wichita Falls to local refiners and a connected carrier;

• an increase in revenues of $2.3 million on our Houston pipeline, as a customer began leasing a portion of the pipeline on January 1, 2019;

• an increase in revenues of $1.5 million on our Ammonia Pipeline mainly due to a tariff rate increase in 2019;

• an increase in revenues of $1.2 million and an increase in throughputs of 4,512 barrels per day on our North Pipeline, primarily due to favorable market conditions in locations served by the North Pipeline; and

• an increase in revenues of $1.2 million on our McKee System pipelines, mainly due to an increase in long-haul deliveries resulting in higher average tariffs.

These increases were partially offset by:

• a decrease in revenues of $2.8 million, despite a slight increase in throughputs on our East Pipeline, due to a decrease in other product sales and lower average tariffs; and

• a decrease in revenues of $0.7 million on our Eagle Ford System, mainly due to lower rates, which more than offset an increase in throughputs of 136,538 barrels per day.

Operating expenses increased $4.2 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, mainly due to:

• an increase in power costs of $1.7 million, spread across various pipeline systems as a result of higher throughputs;

• an increase of $0.8 million due to ad valorem tax rate increases across all pipeline systems; and

• an increase in salaries and wages of $0.7 million.

Depreciation and amortization expense increased $2.3 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, mainly due to completed projects associated with the Permian Crude System in 2019 and owning the assets associated with the Council Bluffs Acquisition for the entire second quarter of 2019.

Storage

Throughput terminal revenues increased $3.0 million while throughputs increased 63,595 barrels per day for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, mainly due to an increase in throughput terminal revenues of $2.8 million and an increase in throughputs of 66,131 barrels per day at our Corpus Christi North Beach terminal, which receives our South Texas Crude System volumes.

Storage terminal revenues decreased $7.4 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, primarily due to the following:

• a decrease in revenues of $10.3 million at our North East Terminals, mainly due to the re-contracting of certain customer contracts in a backwardated market and an adjustment to revenues in 2018 resulting from a change in the term of a contract at our Linden terminal; and

• a decrease in revenues of $1.1 million at our Point Tupper terminal, primarily due to a decrease in throughput and handling fees.

These decreases were partially offset by an increase of $3.3 million at our West Coast Terminals, mainly due to completed projects.

Operating expenses decreased $4.7 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, primarily due to a decrease in maintenance and regulatory expenses of $4.2 million across various terminals.

Depreciation and amortization expense increased $1.0 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, due to an increase in amortization expense of $1.7 million associated with a finance lease for a dock that was completed in September 2018.

35

General

General and administrative expenses decreased $1.9 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, mainly due to lower compensation costs.

Interest expense, net, decreased $2.7 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, mainly due to lower borrowings under our $1.4 billion revolving credit agreement.

Income tax expense decreased $1.4 million for the three months ended June 30, 2019, compared to the three months ended June 30, 2018, primarily due to lower taxable income and Texas margin tax refunds received in the second quarter of 2019.

Discontinued Operations

Please refer to Note 3 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for information on discontinued operations.

36

Six Months Ended June 30, 2019 Compared to Six Months Ended June 30, 2018

Financial Highlights

(Unaudited, Thousands of Dollars, Except Per Unit Data)

	Six Months Ended June 30,						Change
	2019			2018
Statement of Income Data:
Revenues:
Service revenues	$	541,499		$	507,668		$	33,831
Product sales	178,772			258,315			(79,543		)
Total revenues	720,271			765,983			(45,712		)
Costs and expenses:
Costs associated with service revenues	326,315			311,921			14,394
Cost of product sales	172,571			245,089			(72,518		)
General and administrative expenses	50,559			44,896			5,663
Other depreciation and amortization expense	3,938			4,197			(259		)
Total costs and expenses	553,383			606,103			(52,720		)
Operating income	166,888			159,880			7,008
Interest expense, net	(89,984		)	(95,777		)	5,793
Other income, net	1,412			2,623			(1,211		)
Income from continuing operations before income tax expense	78,316			66,726			11,590
Income tax expense	2,478			6,584			(4,106		)
Income from continuing operations, net of tax	75,838			60,142			15,696
(Loss) income from discontinued operations, net of tax	(307,750		)	95,390			(403,140		)
Net (loss) income	$	(231,912	)	$	155,532		$	(387,444	)
Basic net income (loss) per common unit:
Continuing operations	$	0.05		$	0.30		$	(0.25	)
Discontinued operations	(2.86		)	1.00			(3.86		)
Total	$	(2.81	)	$	1.30		$	(4.11	)

Overview

We incurred a net loss of $231.9 million for the six months ended June 30, 2019, compared to net income of $155.5 million for the six months ended June 30, 2018.

Income from continuing operations, net of tax, increased $15.7 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly due to higher operating income from the pipeline segment, partially offset by lower operating income from the storage and fuels marketing segments.

For the six months ended June 30, 2019, loss from discontinued operations, net of tax, includes impairment charges totaling $336.8 million related to the St. Eustatius Operations. For the six months ended June 30, 2018, income from discontinued operations, net of tax, includes a gain of $78.8 million resulting from insurance proceeds received for hurricane damages incurred at our St. Eustatius terminal.

37

Segment Operating Highlights

(Thousands of Dollars, Except Barrels/Day Information)

	Six Months Ended June 30,						Change
	2019			2018
Pipeline:
Crude oil pipelines throughput (barrels/day)	1,054,425			815,568			238,857
Refined products and ammonia pipelines throughput (barrels/day)	536,836			548,910			(12,074		)
Total throughput (barrels/day)	1,591,261			1,364,478			226,783
Throughput revenues	$	328,744		$	287,066		$	41,678
Operating expenses	101,028			91,047			9,981
Depreciation and amortization expense	81,700			75,246			6,454
Segment operating income	$	146,016		$	120,773		$	25,243
Storage:
Throughput (barrels/day)	380,267			337,892			42,375
Throughput terminal revenues	$	44,856		$	40,157		$	4,699
Storage terminal revenues	169,047			186,083			(17,036		)
Total revenues	213,903			226,240			(12,337		)
Operating expenses	95,478			98,017			(2,539		)
Depreciation and amortization expense	48,109			46,355			1,754
Segment operating income	$	70,316		$	81,868		$	(11,552	)
Fuels Marketing:
Product sales and other revenue	$	177,628		$	252,951		$	(75,323	)
Cost of goods	171,303			245,107			(73,804		)
Gross margin	6,325			7,844			(1,519		)
Operating expenses	1,240			1,512			(272		)
Segment operating income	$	5,085		$	6,332		$	(1,247	)
Consolidation and Intersegment Eliminations:
Revenues	$	(4	)	$	(274	)	$	270
Cost of goods	28			(18		)	46
Operating expenses	—			(256		)	256
Total	$	(32	)	$	—		$	(32	)
Consolidated Information:
Revenues	$	720,271		$	765,983		$	(45,712	)
Costs associated with service revenues:
Operating expenses	196,506			190,320			6,186
Depreciation and amortization expense	129,809			121,601			8,208
Total costs associated with service revenues	326,315			311,921			14,394
Cost of product sales	172,571			245,089			(72,518		)
Segment operating income	221,385			208,973			12,412
General and administrative expenses	50,559			44,896			5,663
Other depreciation and amortization expense	3,938			4,197			(259		)
Consolidated operating income	$	166,888		$	159,880		$	7,008

38

Pipeline

Total revenues increased $41.7 million and total throughputs increased 226,783 barrels per day for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, primarily due to:

• an increase in revenues of $30.2 million and an increase in throughputs of 131,973 barrels per day resulting from increased customer production supplying our Permian Crude System and the completion of new pipeline connections and expansion projects;

• an increase in revenues of $7.0 million on our Ardmore System, despite throughputs that remained flat, mainly due to an increase in long-haul deliveries resulting in higher average tariffs and the completion of new pipeline connections that began delivering incremental Permian crude oil in the second quarter of 2019 from Wichita Falls to local refiners and a connected carrier;

• an increase in revenues of $5.0 million on our Houston pipeline, as a customer began leasing a portion of the pipeline on January 1, 2019;

• an increase in revenues of $2.2 million on our Ammonia Pipeline mainly due to a tariff rate increase in 2019;

• an increase in revenues of $1.9 million and an increase in throughputs of 11,963 barrels per day on our Three Rivers System, mainly due to increased demand; and

• an increase in revenues of $1.6 million and an increase in throughputs of 2,907 barrels per day on our North Pipeline, primarily due to favorable market conditions in locations served by the North Pipeline.

These increases were partially offset by:

• a decrease in revenues of $5.1 million and a decrease in throughputs of 51,400 barrels per day due to operational issues at the refinery served by our McKee System pipelines in the first quarter of 2019; and

• a decrease in revenues of $3.7 million on our Eagle Ford System, mainly due to lower rates, which more than offset an increase in throughputs of 125,356 barrels per day.

Operating expenses increased $10.0 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly due to:

• an increase in operating expenses of $6.6 million on our Permian Crude System, mainly due to higher power costs resulting from higher throughputs, as well as higher bad debt expense; and

• an increase in operating costs of $1.5 million due to owning the assets associated with the Council Bluffs Acquisition for the entire period in 2019.

Depreciation and amortization expense increased $6.5 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly due to completed projects associated with the Permian Crude System and owning the assets associated with the Council Bluffs Acquisition for the entire period in 2019.

Storage

Throughput terminal revenues increased $4.7 million, while throughputs increased 42,375 barrels per day for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly due to an increase in throughput terminal revenues of $4.5 million and an increase in throughputs of 46,501 barrels per day at our Corpus Christi North Beach terminal, which receives our South Texas Crude System volumes.

Storage terminal revenues decreased $17.0 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, primarily due to a decrease of $20.7 million at our North East and Gulf Coast Terminals, mainly resulting from a decrease in customer base, the re-contracting of certain customer contracts in a backwardated market and an adjustment to revenues in 2018 resulting from a change in the term of a contract at our Linden terminal. These decreases were partially offset by an increase of $3.7 million at our West Coast Terminals, mainly due to completed projects.

Operating expenses decreased $2.5 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, primarily due to a decrease in maintenance and regulatory expenses of $3.7 million, partially offset by an increase in insurance expense of $1.0 million due to an increase in premiums, both across various terminals.

Depreciation and amortization expense increased $1.8 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly due to amortization expense associated with a finance lease for a dock that was completed in September 2018.

Fuels Marketing

Segment operating income decreased $1.2 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly due to a decrease in operating income from our blending operations.

39

General

General and administrative expenses increased $5.7 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly resulting from lower legal expenses in 2018.

Interest expense, net decreased $5.8 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly due to the maturity of the $350.0 million of 7.65% senior notes in the second quarter of 2018, which were paid off with lower interest revolver borrowings. These notes were replaced with $500.0 million of 6.0% senior notes in the second quarter of 2019.

Income tax expense decreased $4.1 million for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, mainly due to lower taxable income and tax refunds received in the second quarter of 2019.

Discontinued Operations

For the six months ended June 30, 2019, we recognized a loss from discontinued operations, net of tax, of $307.8 million, primarily due to long-lived asset impairment charges of $305.7 million and a goodwill impairment charge of $31.1 million in 2019 associated with the St. Eustatius Operations. Please refer to Note 3 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for further information.

For the six months ended June 30, 2018, we recognized income from discontinued operations, net of tax, of $95.4 million, mainly due to a gain of $78.8 million from insurance proceeds received in the first quarter of 2018 relating to hurricane damage at our St. Eustatius terminal in the third quarter of 2017.

40

TRENDS AND OUTLOOK

In 2019, we continue to execute on the comprehensive plan that we began in 2018, which included simplifying our corporate structure and eliminating the incentive distribution rights, reducing our leverage metrics and improving our distribution coverage ratio. Those actions, combined with our sale of the St Eustatius Operations in July 2019 and the European Operations in the fourth quarter of 2018, positioned us to fund a larger proportion of our capital projects with the cash generated by our operations, thus reducing our need to access common equity markets to finance future growth opportunities.

We continue to see significant opportunities emanate from the growth in North American shale production, especially in the Permian Basin, as that growth drives demand for the midstream logistics assets and services necessary to transport and store crude from the wellhead to domestic and international destinations. Our Permian Crude System was built to directly benefit from horizontal well production in the Permian Basin, but we also have assets in Texas and elsewhere on the Gulf Coast that are either already benefiting, or that we expect to benefit in the future, from North American shale production growth. We expect our Permian Crude System to benefit from higher throughputs as production grows in that basin, and we expect our crude oil pipeline systems, including our Wichita Falls, Ardmore and South Texas crude systems, and our Gulf Coast storage and export dock facilities in Corpus Christi, Texas and St. James, Louisiana to benefit from increased utilization as shale play production grows and Gulf Coast exports increase.

Early in the third quarter of 2019, we completed the first phase of a project connecting our Corpus Christi terminal to a pipeline transporting Permian barrels for export, and we continue to expect to complete the second phase of that project in the third quarter. Once we begin transporting volumes, we expect to see improved results for our storage facility in Corpus Christi. Our St. James terminal is now benefiting from North American shale production growth through increased unit train activity at that facility to accommodate shale crude volumes from the Permian, the Bakken and Western Canada. Longer term, we expect our St. James terminal to benefit from its advantaged location and shale-driven shifts in domestic crude flows. While backwardated crude prices in 2019 could have a detrimental impact on some of our storage facilities, we believe we are insulated to some extent by long-term contracts at certain of our facilities where backwardation is a driving factor, and due to the fact that we have storage assets in markets where forward pricing has little impact on rates or renewals.

In addition to the Permian-related growth, we also expect 2019 results to benefit from pipeline expansion projects to facilitate the export of refined products to Northern Mexico and the completion of a number of bio-fuel projects at our West Coast terminals in 2018 and 2019.

Our outlook for the Partnership, both overall and for any of our segments, may change, as we base our expectations on our continuing evaluation of a variety of factors, many of which are outside our control. These factors include, but are not limited to, the state of the economy and the capital markets; our customers’ refinery maintenance schedules and unplanned refinery downtime; crude oil prices; the supply of and demand for crude oil, refined products and anhydrous ammonia; demand for our transportation and storage services; and laws or regulations affecting our assets.

41

LIQUIDITY AND CAPITAL RESOURCES

Overview

Our primary cash requirements are for distributions to our partners, debt service, capital expenditures, acquisitions and operating expenses.

Our partnership agreement requires that we distribute all “Available Cash” to our common limited partners each quarter. “Available Cash” is defined in the partnership agreement generally as cash on hand at the end of the quarter, plus certain permitted borrowings made subsequent to the end of the quarter, less cash reserves determined by our board of directors, subject to requirements for distributions for our preferred units.

Each year, our objective is to fund our reliability capital expenditures and distribution requirements with our net cash provided by operating activities during that year. If we do not generate sufficient cash from operations to meet that objective, we utilize cash on hand or other sources of cash flow, which in the past have primarily included borrowings under our revolving credit agreement, sales of non-strategic assets and, to the extent necessary, funds raised through equity or debt offerings. We have typically funded our strategic capital expenditures and acquisitions from external sources, primarily borrowings under our revolving credit agreement or funds raised through equity or debt offerings. However, our ability to raise funds by issuing debt or equity depends on many factors beyond our control. Our risk factors in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2018 describe the risks inherent to these sources of funding and the availability thereof.

During periods when our cash flow from operations is less than our distribution and reliability capital requirements, we may maintain our distribution level because we can use other sources of Available Cash, as provided in our partnership agreement, including borrowings under our revolving credit agreement and proceeds from the sales of assets. Our risk factors in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2018 describe the risks inherent in our ability to maintain or grow our distribution.

For 2019, we expect our total cash from operations to exceed our distribution and reliability capital requirements. Furthermore, proceeds from the St. Eustatius Disposition in July 2019 were initially used to repay outstanding borrowings under our revolving credit agreement, increasing the amount available for borrowing. The sale is part of our plan to improve our debt metrics and partially fund capital projects to grow our core business in North America.

Cash Flows for the Six Months Ended June 30, 2019 and 2018

The following table summarizes our cash flows from operating, investing and financing activities (please refer to our Consolidated Statements of Cash Flows in Item 1. “Financial Statements”):

	Six Months Ended June 30,
	2019			2018
	(Thousands of Dollars)
Net cash provided by (used in):
Operating activities	$	240,894		$	243,850
Investing activities	(303,674		)	(224,827		)
Financing activities	73,757			(22,550		)
Effect of foreign exchange rate changes on cash	261			(421		)
Net increase (decrease) in cash, cash equivalents and restricted cash	$	11,238		$	(3,948	)

Net cash provided by operating activities for the six months ended June 30, 2019 was comparable to the six months ended June 30, 2018. For the six months ended June 30, 2019, the net cash provided by operating activities was used to fund our distributions to unitholders of $189.9 million and reliability capital expenditures of $27.2 million, and along with net proceeds from debt borrowings to fund our strategic capital expenditures of $292.8 million, as described in the Capital Requirements section below.

For the six months ended June 30, 2018, the net cash provided by operating activities was used to fund our distributions to unitholders and our general partner in the aggregate amount of $205.0 million. Net cash provided by operating activities as well as a portion of the insurance recoveries relating to hurricane damage at our St. Eustatius terminal were used to fund reliability capital expenditures of $41.8 million, and proceeds from debt borrowings were used to fund our strategic capital expenditures of $244.2 million. The proceeds from the issuance of units were used to repay outstanding borrowings under our revolving credit agreement.

42

Debt Sources of Liquidity

Revolving Credit Agreement. Our $1.4 billion revolving credit agreement (the Revolving Credit Agreement) is subject to maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements, which may limit the amount we can borrow to an amount less than the total amount available for borrowing. For the rolling period of four quarters ending June 30, 2019, the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) could not exceed 5.00-to-1.00 and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00. As of June 30, 2019, our consolidated debt coverage ratio was 3.9x and our consolidated interest coverage ratio was 2.5x. As of June 30, 2019, we had $853.5 million available for borrowing.

In the second quarter of 2019, our credit rating was downgraded by S&P Global Ratings from BB to BB-, and our outlook was changed from negative to stable by the three credit rating agencies identified in the table below. Per the terms of the Revolving Credit Agreement, these changes did not impact the interest rate on our Revolving Credit Agreement, which is the only debt arrangement with an interest rate that is subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. The following table reflects the current outlook and ratings that have been assigned to our debt:

	Fitch, Inc.	Moody’s Investor Service Inc.	S&P Global Ratings
Ratings	BB	Ba2	BB-
Outlook	Stable	Stable	Stable

Receivables Financing Agreement. NuStar Energy and NuStar Finance LLC (NuStar Finance), a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $125.0 million receivables financing agreement with third-party lenders (the Receivables Financing Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (collectively with the Receivables Financing Agreement, the Securitization Program). On April 29, 2019, we amended the Receivables Financing Agreement to extend the scheduled termination date from September 20, 2020 to September 20, 2021 and to amend certain provisions with respect to receivables related to certain customers. The amount available for borrowing under the Receivables Financing Agreement is limited to $125.0 million and is based on the availability of eligible receivables and other customary factors and conditions.

Issuance of Debt. On May 22, 2019, NuStar Logistics issued $500.0 million of 6.0% senior notes due June 1, 2026. We received net proceeds of approximately $491.7 million, which we initially used to repay outstanding borrowings under our Revolving Credit Agreement.

Other Debt Sources of Liquidity. Other sources of liquidity as of June 30, 2019 consist of the following:

• $365.4 million in revenue bonds pursuant to the Gulf Opportunity Zone Act of 2005 (the GoZone Bonds), with $43.1 million remaining in trust as of June 30, 2019, supported by $370.2 million in letters of credit; and

• one short-term line of credit agreement with an uncommitted borrowing capacity of up to $35.0 million, with $6.0 million of borrowings outstanding as of June 30, 2019.

We are also a party to a $100.0 million uncommitted letter of credit agreement, which provides for standby letters of credit or guarantees with a term of up to one year (LOC Agreement). As of June 30, 2019, we had no letters of credit issued under the LOC Agreement.

Please refer to Note 5 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for a discussion of certain of our debt agreements.

Capital Requirements

Our operations require significant investments to maintain, upgrade or enhance the operating capacity of our existing assets. Our capital expenditures consist of:

• strategic capital expenditures, such as those to expand or upgrade the operating capacity, increase efficiency or increase the earnings potential of existing assets, whether through construction or acquisition, as well as certain capital expenditures related to support functions; and

• reliability capital expenditures, such as those required to maintain the current operating capacity of existing assets or extend their useful lives, as well as those required to maintain equipment reliability and safety.

43

The following table summarizes our capital expenditures for the six months ended June 30, 2019 and 2018, and the amount we expect to spend in 2019:

	Strategic Acquisitions and Capital Expenditures		Reliability Capital Expenditures		Total
	(Thousands of Dollars)
For the six months ended June 30:
2019	$	292,785	$	27,176	$	319,961
2018	$	244,228	$	41,795	$	286,023
Expected for the year ended December 31, 2019	$ 500,000 - 550,000		$ 60,000 - 80,000

Strategic capital expenditures for the six months ended June 30, 2019 mainly consisted of pipeline expansions on our Permian Crude System, Northern Mexico refined products supply projects and an export project to connect our Corpus Christi North Beach terminal to long-haul pipelines transporting crude oil from the Permian Basin. Strategic capital expenditures for the six months ended June 30, 2018 consisted of pipeline expansions on our Permian Crude System and terminal expansions. Reliability capital expenditures primarily relate to maintenance upgrade projects at our terminals, including costs to repair the property damage at the St. Eustatius terminal.

For the year ended December 31, 2019, we expect a significant portion of our strategic capital spending to relate to our Permian Crude System and the Northern Mexico and export projects described above. A large portion of reliability capital spending for 2019 related to hurricane damage repairs at the St. Eustatius facility prior to the sale in July 2019, which was funded with insurance proceeds already received. We expect reliability capital spending for 2019 to also relate to the completion of our Ammonia Pipeline replacement project. We continue to evaluate our capital budget and make changes as economic conditions warrant, and our actual capital expenditures for 2019 may increase or decrease from the expected amounts noted above. We believe cash on hand, combined with the sources of liquidity previously described, will be sufficient to fund our capital expenditures in 2019, and our internal growth projects can be accelerated or scaled back depending on market conditions or customer demand.

Distributions

Common Units. Distribution payments are made to our common limited partners within 45 days after the end of each quarter as of a record date that is set after the end of each quarter. The following table summarizes information about quarterly cash distributions to our common limited partners:

Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
June 30, 2019	$	0.60	$	64,658	August 7, 2019	August 13, 2019
March 31, 2019	$	0.60	$	64,690	May 8, 2019	May 14, 2019

Preferred Units. Distributions on our preferred units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month.

44

The following table provides the terms related to distributions for our Series A, Series B and Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively, the Series A, B and C Preferred Units):

Units	Fixed Distribution Rate Per Annum (as a Percentage of the $25.00 Liquidation Preference Per Unit)	Fixed Distribution Rate Per Unit Per Annum		Fixed Distribution Per Annum		Optional Redemption Date/Date at Which Distribution Rate Becomes Floating	Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference Per Unit)
				(Thousands of Dollars)
Series A Preferred Units	8.50%	$	2.125	$	19,253	December 15, 2021	Three-month LIBOR plus 6.766%
Series B Preferred Units	7.625%	$	1.90625	$	29,357	June 15, 2022	Three-month LIBOR plus 5.643%
Series C Preferred Units	9.00%	$	2.25	$	15,525	December 15, 2022	Three-month LIBOR plus 6.88%

The distribution rate on our Series D Cumulative Convertible Preferred Units (the Series D Preferred Units) is: (i) 9.75% per annum (or $0.619 per unit per distribution period) for the first two years; (ii) 10.75% per annum (or $0.682 per unit per distribution period) for years three through five; and (iii) the greater of 13.75% per annum (or $0.872 per unit per distribution period) or the distribution per common unit thereafter. While the Series D Preferred Units are outstanding, the Partnership will be prohibited from paying distributions on any junior securities, including the common units, unless full cumulative distributions on the Series D Preferred Units (and any parity securities) have been, or contemporaneously are being, paid or set aside for payment through the most recent Series D Preferred Unit distribution payment date. Any Series D Preferred Unit distributions in excess of $0.635 may be paid, in the Partnership’s sole discretion, in additional Series D Preferred Units, with the remainder paid in cash.

In July 2019, our board of directors declared distributions with respect to the Series A, B and C Preferred Units and the Series D Preferred Units to be paid on September 16, 2019.

Debt Obligations

As of June 30, 2019, we were a party to the following debt agreements:

• Revolving Credit Agreement due October 29, 2020, with $543.0 million of borrowings outstanding as of June 30, 2019;

• 4.80% senior notes due September 1, 2020 with a face value of $450.0 million; 6.75% senior notes due February 1, 2021 with a face value of $300.0 million; 4.75% senior notes due February 1, 2022 with a face value of $250.0 million; 6.0% senior notes due June 1, 2026 with a face value of $500.0 million; 5.625% senior notes due April 28, 2027 with a face value of $550.0 million; and subordinated notes due January 15, 2043 with a face value of $402.5 million and a floating interest rate, which was 9.3% as of June 30, 2019;

• $365.4 million in GoZone Bonds due from 2038 to 2041;

• Line of credit agreement with $6.0 million of borrowings outstanding as of June 30, 2019; and

• Receivables Financing Agreement due September 20, 2021, with $62.8 million of borrowings outstanding as of June 30, 2019.

Management believes that, as of June 30, 2019, we are in compliance with the ratios and covenants contained in our debt instruments. A default under certain of our debt agreements would be considered an event of default under other of our debt instruments. Please refer to Note 5 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for a discussion of certain of our debt agreements.

Interest Rate Swaps

As of June 30, 2019 and December 31, 2018, we were a party to forward-starting interest rate swap agreements for the purpose of hedging interest rate risk. As of June 30, 2019 and December 31, 2018, the aggregate notional amount of these forward-starting interest rate swaps was $250.0 million. Please refer to Note 8 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for a more detailed discussion of our interest rate swaps.

45

Environmental, Health and Safety

Our operations are subject to extensive international, federal, state and local environmental laws and regulations, in the U.S. and in the other countries in which we operate, including those relating to the discharge of materials into the environment, waste management, remediation, the characteristics and composition of fuels, climate change and greenhouse gases. Our operations are also subject to extensive health, safety and security laws and regulations, including those relating to worker and pipeline safety, pipeline and storage tank integrity and operations security. Because more stringent environmental and safety laws and regulations are continuously being enacted or proposed, the level of expenditures required for environmental, health and safety matters is expected to increase in the future.

Contingencies

We are subject to certain loss contingencies, and we believe that the resolution of any particular claim or proceeding, or all matters in the aggregate, would not have a material adverse effect on our results of operations, financial position or liquidity, as further disclosed in Note 6 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements.”

CRITICAL ACCOUNTING POLICIES

The preparation of financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Our critical accounting policies are disclosed in our Annual Report on Form 10-K for the year ended December 31, 2018.

NEW ACCOUNTING PRONOUNCEMENTS

Please refer to Note 2 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for a discussion of new accounting pronouncements.

46

Item 3. Quantitative and Qualitative Disclosures About Market Risk

We manage our exposure to changing interest rates principally through the use of a combination of fixed-rate debt and variable-rate debt. In addition, we utilize forward-starting interest rate swap agreements to lock in the rate on the interest payments related to forecasted debt issuances. Borrowings under our variable-rate debt expose us to increases in interest rates. Since the operations of our fuels marketing segment expose us to commodity price risk, we also use derivative instruments to attempt to mitigate the effects of commodity price fluctuations. Derivative financial instruments associated with commodity price risk were not material for any periods presented.

Please refer to Note 8 of the Condensed Notes to Consolidated Financial Statements in Item 1. “Financial Statements” for a more detailed discussion of our interest rate swaps. The following tables present principal cash flows and related weighted-average interest rates by expected maturity dates for our long-term debt, excluding finance leases:

	June 30, 2019
	Expected Maturity Dates
	2019		2020			2021			2022			2023		There- after			Total			Fair Value
	(Thousands of Dollars, Except Interest Rates)
Long-term Debt:
Fixed-rate	$	—	$	450,000		$	300,000		$	250,000		$	—	$	1,050,000		$	2,050,000		$	2,098,945
Weighted-average rate	—		4.8		%	6.8		%	4.8		%	—		5.8		%	5.6		%
Variable-rate	$	—	$	543,000		$	62,800		$	—		$	—	$	767,940		$	1,373,740		$	1,374,861
Weighted-average rate	—		4.4		%	3.3		%	—			—		5.8		%	5.1		%

	December 31, 2018
	Expected Maturity Dates
	2019		2020			2021			2022			2023		There- after			Total			Fair Value
	(Thousands of Dollars, Except Interest Rates)
Long-term Debt:
Fixed-rate	$	—	$	450,000		$	300,000		$	250,000		$	—	$	550,000		$	1,550,000		$	1,499,920
Weighted-average rate	—		4.8		%	6.8		%	4.8		%	—		5.6		%	5.5		%
Variable-rate	$	—	$	806,800		$	—		$	—		$	—	$	767,940		$	1,574,740		$	1,556,784
Weighted-average rate	—		4.4		%	—			—			—		5.6		%	5.0		%

The following table presents information regarding our forward-starting interest rate swap agreements:

Notional Amount					Weighted-Average Fixed Rate		Fair Value
June 30, 2019		December 31, 2018		Period of Hedge			June 30, 2019			December 31, 2018
(Thousands of Dollars)							(Thousands of Dollars)
$	250,000	$	250,000	09/2020 - 09/2030	2.8	%	$	(16,716	)	$	(124	)

47

Item 4. Controls and Procedures

(a) Evaluation of disclosure controls and procedures.

Our management has evaluated, with the participation of the principal executive officer and principal financial officer of NuStar GP, LLC, the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934) as of the end of the period covered by this report, and has concluded that our disclosure controls and procedures were effective as of June 30, 2019.

(b) Changes in internal control over financial reporting.

There has been no change in our internal control over financial reporting that occurred during our last fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

48

PART II - OTHER INFORMATION

Item 6. Exhibits

Exhibit Number		Description
10.01		Eleventh Amendment to Letter of Credit Agreement, dated as of April 10, 2019, among NuStar Logistics, L.P., NuStar Energy L.P., the Lenders party thereto and Mizuho Bank, Ltd., as Issuing Bank and Administrative Agent (incorporated by reference to Exhibit 10.01 to NuStar Energy L.P.’s Quarterly Report on Form 10-Q for quarter ended June 30, 2019 (File No. 001-16417))
10.02		NuStar Energy L.P. 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to NuStar Energy L.P.’s Current Report on Form 8-K filed April 23, 2019 (File No. 001-16417))
10.03		Form of Restricted Unit Award Agreement under the NuStar Energy L.P. 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.2 to NuStar Energy L.P.’s Current Report on Form 8-K filed April 23, 2019 (File No. 001-16417))
10.04		Form of Non-Employee Director Restricted Unit Award Agreement under the NuStar Energy L.P. 2019 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.3 to NuStar Energy L.P.’s Current Report on Form 8-K filed April 23, 2019 (File No. 001-16417))
10.05		Fourth Amendment to Receivables Financing Agreement, dated as of April 29, 2019, by and among NuStar Finance, LLC, as Borrower, NuStar Energy L.P., as initial Servicer, Mizuho Bank, Ltd. and PNC Bank, National Association (incorporated by reference to Exhibit 10.1 to NuStar Energy L.P.’s Current Report on Form 8-K filed April 29, 2019 (File No. 001-16417))
*10.06		Maturity Extension Letter (Amendment No. 6) to Letter of Credit Agreement and Subsidiary Guaranty Agreement dated as of July 15, 2019 among NuStar Logistics, L.P., NuStar Energy L.P., the Lenders party thereto and MUFG Bank, Ltd., as Issuing Bank and Administrative Agent
*10.07		Form of 2019 Performance Unit Award Agreement under the NuStar Energy L.P. 2019 Long-Term Incentive Plan
*31.01		Rule 13a-14(a) Certification (under Section 302 of the Sarbanes-Oxley Act of 2002) of principal executive officer
*31.02		Rule 13a-14(a) Certification (under Section 302 of the Sarbanes-Oxley Act of 2002) of principal financial officer
**32.01		Section 1350 Certification (under Section 906 of the Sarbanes-Oxley Act of 2002) of principal executive officer
**32.02		Section 1350 Certification (under Section 906 of the Sarbanes-Oxley Act of 2002) of principal financial officer
*101.INS		XBRL Instance Document - The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
*101.SCH		XBRL Taxonomy Extension Schema Document
*101.CAL		XBRL Taxonomy Extension Calculation Linkbase Document
*101.DEF		XBRL Taxonomy Extension Definition Linkbase Document
*101.LAB		XBRL Taxonomy Extension Label Linkbase Document
*101.PRE		XBRL Taxonomy Extension Presentation Linkbase Document
*104		Cover Page Interactive Data File - The cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
*	Filed herewith.
**	Furnished herewith.

49

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

NUSTAR ENERGY L.P.

(Registrant)

By: Riverwalk Logistics, L.P., its general partner

By: NuStar GP, LLC, its general partner

By:	/s/ Bradley C. Barron
	Bradley C. Barron
	President and Chief Executive Officer
	August 9, 2019
By:	/s/ Thomas R. Shoaf
	Thomas R. Shoaf
	Executive Vice President and Chief Financial Officer
	August 9, 2019
By:	/s/ Jorge A. del Alamo
	Jorge A. del Alamo
	Senior Vice President and Controller
	August 9, 2019

50

EX-10.06

Exhibit 10.06

NuStar Logistics L.P.

19003 IH-10 West

San Antonio, Texas 78257

NuStar Energy L.P.

19003 IH-10 West

San Antonio, Texas 78257

Attention: Thomas R. Shoaf, Executive Vice President and Chief Financial Officer

July 15, 2019

RE: Maturity Date Extension

Reference is made to (i) that certain Letter of Credit Agreement, dated as of September 3, 2014 (the “Original Agreement”), (ii) that certain Amendment No. 1 to Letter of Credit Agreement and Subsidiary Guaranty Agreement dated as of November 3, 2014 (the “Amendment No. 1”),(iii) that certain Maturity Date Extension Letter Amendment dated on or about August 18, 2015 (the “2015 Extension Letter”), (iv) that certain Maturity Date Extension Letter Amendment dated on or about July 15, 2016 (the “2016 Extension Letter”), (v) that certain Maturity Date Extension Letter Amendment dated July 13, 2017 (the “2017 Extension Letter”), and (vi) that certain Maturity Date Extension Letter Amendment dated July 12, 2018 (the “2018 Extension Letter”, and together with the Original Agreement, Amendment No. 1, the 2015 Extension Letter, the 2016 Extension Letter, the 2017 Extension Letter, and as further amended, restated, supplemented or otherwise modified from time to time, the “Agreement”) by and among NUSTAR LOGISTICS, L.P. and NUSTAR ENERGY L.P., both Delaware limited partnerships (together the “NuStar Parties”), the Lenders, and MUFG BANK, LTD., as Issuing Bank and Administrative Agent . Capitalized terms used but not defined herein shall have the respective meanings given to such terms in the Agreement.

Whereas the Agreement was intended to expire as of September 2, 2019, and whereas the Lenders, the NuStar Parties and the Administrative Agent mutually wish to extend the expiry of the Agreement until September 2, 2020, now therefore, for good and valuable consideration, the sufficiency of which is hereby acknowledged, the parties hereto agree as that the term “Maturity Date” as set forth in the Agreement is hereby amended to read “September 2, 2020” and Schedule 3.12 to the Agreement is hereby deleted in its entirety and replaced with Schedule 3.12 attached hereto.

The NuStar Parties hereby represent and warrant that (a) it has full power and authority, and has taken all action necessary, to execute and deliver this letter, (b) this letter has been duly executed and delivered by it and constitutes its legal, valid and binding obligation, enforceable in accordance with its terms, (c) after giving effect to the provisions of this letter, the representations and warranties of the NuStar Parties contained in Article III of the Agreement shall be true on and as of the date hereof as if they had been made on such date (except for those representations stated to be relate to a specific earlier date, which representations shall continue to be true and correct as of such earlier date), (d) no Default or Event of Default has occurred and is continuing on the date hereof, and (e) there have been no changes to the partnership agreements of the NuStar Parties since the date of the Agreement other than such amendments which have been furnished in compliance with Section 5.02(e) of the Agreement.

No other provision of the Agreement is amended by this letter. The NuStar Parties hereby confirm that the Agreement remains in full force and effect as amended hereby, and that all obligations of such NuStar parties set forth therein are ratified and reconfirmed. The execution, delivery and effectiveness of this letter shall not, except as expressly provided herein, operate as a waiver of any right, power or remedy of any Lender or the Agent under the Agreement or any of

the Loan Documents, nor constitute a waiver of any provision of the Agreement or any of the Loan Documents. This letter shall be construed in accordance with and governed by the law of the State of New York.

This letter may be executed by one or more of the parties to this letter on any number of separate counterparts (including by facsimile transmission or electronic transmission in portable document format of signature pages hereto), and all of said counterparts taken together shall be deemed to constitute one and the same instrument. Delivery of this letter by facsimile transmission or electronic transmission in portable document format shall be effective as delivery of a manually executed counterparty hereof.

Regards,

MUFG BANK, LTD.,

as Administrative Agent

By: /s/ Todd Vaubel

Name: Todd Vaubel

Title: Director

ACKNOWLEDGED AND AGREED:

NUSTAR LOGISTICS, L.P.

By: NuStar GP, Inc., its General Partner

By: /s/ Thomas R. Shoaf

Name: Thomas R. Shoaf

Title: Executive Vice President and Chief Financial Officer

NUSTAR ENERGY L.P.

By: Riverwalk Logistics, L.P., its General Partner

By: NuStar GP, LLC, its General Partner

By: /s/ Thomas R. Shoaf

Name: Thomas R. Shoaf

Title: Executive Vice President and Chief Financial Officer

GUARANTOR:

NUSTAR PIPELINE OPERATING PARTNERSHIP L.P.

By: NuStar Pipeline Company, LLC,

its General Partner

By: /s/ Thomas R. Shoaf

Name: Thomas R. Shoaf

Title: Executive Vice President and

Chief Financial Officer

ACKNOWLEDGED AND AGREED:

SUMITOMO MITSUI BANKING CORPORATION,

as Lender

By: /s/ Michael Maguire

Name: Michael Maguire

Title: Executive Director

MUFG BANK, LTD.,

as Issuing Bank and a Lender

By: /s/ Todd Vaubel

Name: Todd Vaubel

Title: Director

SCHEDULE 3.12

Subsidiaries

Subsidiary	Jurisdiction of Organization	Restricted/ Unrestricted/Material	Ownership Percentage
Bicen Development Corporation N.V.	Netherlands	Restricted	100%
Cooperatie NuStar Holdings U.A.	Netherlands	Restricted	100%
LegacyStar Services, LLC	Delaware	Restricted	100%
NS Security Services, LLC	Delaware	Restricted	100%
NuStar Caribe Terminals, Inc.	Delaware	Restricted	100%
NuStar Energy Services, Inc.	Delaware	Restricted	100%
NuStar Finance LLC	Delaware	Restricted	100%
NuStar GP Holdings, LLC	Delaware	Restricted	100%
NuStar GP, Inc.	Delaware	Restricted	100%
NuStar GP, LLC	Delaware	Restricted	100%
NuStar Holdings B.V.	Netherlands	Restricted	100%
NuStar Internacional, S de R.L. de C.V.	Mexico	Restricted	100%
NuStar Logistics, L.P.	Delaware	Restricted - Material	100%
NuStar Permian Crude Logistics, LLC	Delaware	Restricted	100%
NuStar Permian Holdings, LLC	Delaware	Restricted	100%
NuStar Permian Transportation and Storage, LLC	Delaware	Restricted - Material	100%
NuStar Pipeline Company, LLC	Delaware	Restricted	100%
NuStar Pipeline Holding Company, LLC	Delaware	Restricted	100%
NuStar Pipeline Operating Partnership L.P.	Delaware	Restricted - Material	100%
NuStar Pipeline Partners L.P.	Delaware	Restricted	100%
NuStar Services Company LLC	Delaware	Restricted	100%
NuStar Supply & Trading LLC	Delaware	Restricted	100%
NuStar Terminals Canada Co.	Canada	Restricted	100%
NuStar Terminals Canada Holdings Co.	Canada	Restricted	100%
NuStar Terminals Canada Partnership	Canada	Restricted	100%
NuStar Terminals Corporation N.V.	Curacao	Restricted	100%
NuStar Terminals Delaware, Inc.	Delaware	Restricted	100%
NuStar Terminals International N.V.	Curacao	Restricted	100%
NuStar Terminals Marine Services N.V.	Netherlands	Restricted	100%
NuStar Terminals New Jersey, Inc.	Delaware	Restricted	100%
NuStar Terminals N.V.	Netherlands	Restricted - Material	100%
NuStar Terminals Operations Partnership L.P.	Delaware	Restricted	100%
NuStar Terminals Partners TX L.P.	Delaware	Restricted	100%
NuStar Terminals Services, Inc.	Delaware	Restricted	100%
NuStar Terminals Texas, Inc.	Delaware	Restricted	100%
NuStar Texas Holdings, Inc.	Delaware	Restricted	100%
Point Tupper Marine Services Co.	Canada	Restricted	100%
Riverwalk Logistics, L.P.	Delaware	Restricted	100%
Saba Company N.V.	Netherlands	Restricted	100%
Seven Seas Steamship Company (Sint Eustatius) N.V.	Netherlands	Restricted	100%
Shore Terminals LLC	Delaware	Restricted	100%
ST Linden Terminal, LLC	Delaware	Restricted	100%
Star Creek Ranch, LLC	Delaware	Restricted	100%

EX-10.07

Exhibit 10.07

PERFORMANCE UNIT AWARD AGREEMENT

This Performance Unit Agreement (“Agreement”), effective as of July 24, 2019 (“Grant Date”), is between NuStar Energy L.P. (the “Partnership”) and the recipient of this Agreement (“Participant”), a participant in the NuStar Energy L.P. 2019 Long-Term Incentive Plan, as the same may be amended (the “Plan”), pursuant to and subject to the provisions of the Plan. All capitalized terms contained in this Agreement shall have the same definitions as are set forth in the Plan unless otherwise defined herein. The terms governing this Award are set forth below. Certain provisions applicable to this Agreement are set forth on Appendix A.

1. Grant of Performance Units. The Compensation Committee (the “Committee”) of the Board of Directors of NuStar GP, LLC (the “Company”) hereby grants, pursuant to Section 6.3 of the Plan, to Participant the number ofPerformance Units under the Plan communicated to the Participant by the Participant’s manager, which represents the target number of Performance Units subject to this Agreement, which grant is subject to the terms and conditions of this Agreement and the Plan. A “Performance Unit” is an unfunded, unsecured contractual right (commonly referred to as a “phantom unit”) which, upon vesting, entitles Participant to receive a Unit of the Partnership. No DERs are granted in connection with this Award of Performance Units.

2. Performance Period. Except as provided below with respect to a Change of Control and as the Committee may provide with respect to TUR (as defined in Section 4A), the performance period for any Performance Units eligible to vest on any given Vesting Date (as defined below) shall be the calendar year ending on the December 31 immediately preceding such Vesting Date (each, a “Performance Period” and specifically, with respect to each of 2019, 2020 and 2021, the “Year 1 Performance Period,” the “Year 2 Performance Period,” and the “Year 3 Performance Period,” respectively).

3. Vesting and Settlement.

A. Vesting. Except as otherwise provided in this Agreement, the Performance Units granted hereunder shall be eligible to vest, subject to Section 4, over a period of three years in equal, one-third increments (provided, however, that if such increments would otherwise result in a fractional Performance Unit with respect to the applicable Annual Tranche, such fractional Performance Unit shall be rounded to the nearest whole number) (each increment, an “Annual Tranche” and specifically, with respect to the applicable Performance Period for each of the periods ending on December 31, 2019, 2020 and 2021, the “Year 1 Annual Tranche,” the “Year 2 Annual Tranche,” and the “Year 3 Annual Tranche,” respectively). Except as otherwise provided in this Agreement, the applicable portion, if any, of each Annual Tranche shall vest on the date that the Committee certifies the attainment of the Performance Goals established by Committee (“Performance Measures”) for the applicable Performance Period in accordance with Section 4 following completion of the applicable Performance Period (each of these three vesting dates is referred to as a “Vesting Date”).Except as provided below in Section 3C, Performance Units subject to an Annual Tranche that do not vest as of the Vesting Date for such Annual Tranche shall be automatically and immediately forfeited for no consideration. In no event shall a number of Performance Units greater than 200% of the number of Performance Units subject to this Agreement vest under any circumstances.

B. Settlement. Except as provided otherwise in Section 6, any Performance Units that vest pursuant to this Agreement shall be settled as soon as reasonably practical after the applicable Vesting Date and in all events no later than March 15 of the calendar year following the end of the applicable Performance Period. This Agreement and the Award evidenced hereby are intended to comply with or otherwise be exempt from, and shall be administered consistently in all respects with, Section 409A of the Code and the regulations promulgated thereunder and each payment hereunder shall be considered a separate payment under Section 409A of the Code. If necessary in order to attempt to ensure such compliance, this Agreement may be reformed, to the extent possible, unilaterally by the Partnership consistent with guidance issued by the Internal Revenue Service. Participant agrees that the Units to which Participant will be entitled in connection with the vesting, if any, of each Performance Unit may be in uncertificated form and recorded with the Partnership’s or its Affiliates’ service provider.

C. Additional Vesting Opportunity for Carried Forward Units. With respect to each Annual Tranche, any Performance Units that do not vest on the original Vesting Date for such Annual Tranche and that would otherwise be forfeited pursuant to Section 3A (the “Carried Forward Units”) shall not be forfeited pursuant to Section 3A and shall again be eligible to vest on the Vesting Date for the immediately following Performance Period. The portion of the Carried Forward Units that vest, if at all, shall be based on the attainment of the Performance Measures for such immediately following Performance Period; provided, however, that regardless of the level of Performance Measures achieved for the immediately following Performance Period, no more than 100% of the Carried Forward Units shall be eligible to vest. Any Carried Forward Units that do not vest on the Vesting Date for the immediately following Performance Period shall be automatically and immediately forfeited for no consideration.

4. Performance Measures.

A. Performance Unit Vesting for the Year 1 Performance Period. The number of Performance Units in the Year 1 Annual Tranche that will vest on the applicable Vesting Date shall be determined by multiplying (1) the average of the DCR Vesting Percentage for the Year 1 Annual Tranche and the TUR Vesting Percentage for the Year 1 Annual Tranche (each, as defined below) by (2) the number of Performance Units in the Year 1 Annual Tranche.

I. DCR Vesting Percentage for the Year 1 Annual Tranche. The DCR Vesting Percentage for the Year 1 Annual Tranche shall be based on the distribution coverage ratio (“DCR”) achieved by the Partnership during the Year 1 Performance Period as follows:

Level	DCR	DCR Vesting Percentage for Year 1 Annual Tranche
Threshold	1.10 : 1	50%
Target	1.21 : 1	100%
Exceeds Target	1.33 : 1	150%
Maximum	1.45 : 1	200%

If the actual performance is between performance levels, the DCR Vesting Percentage will be interpolated on a straight line basis for achievement between performance levels. Notwithstanding the foregoing, the Committee has full discretion to apply a DCR Vesting Percentage between 0% and 200% to the Year 1 Annual Tranche.

II. TUR Vesting Percentage for the Year 1 Annual Tranche. The TUR Vesting Percentage for the Year 1 Annual Tranche shall be based on the Partnership’s total unitholder return (“TUR”) relative to the TURs of the peer group of companies set forth on Appendix B (the “Target Group”) during the period beginning on July 31, 2018 and ending on December 31, 2019 (“Year 1 TUR Period”).

a. Total Unitholder Return (TUR). The TUR for each company in the Target Group (including the Partnership) is measured by dividing the sum of (i) the cash distributions on the common shares or common units of such company during the Year 1 TUR Period, assuming cash distribution reinvestment and (ii) the difference between the price of a common share or common unit of such company at the end and at the beginning of the Year 1 TUR Period (appropriately adjusted for any share or unit dividend, share or unit split, spin-off, merger or other similar corporate events) by (iii) the price of a common share or common unit of such company at the beginning of the Year 1 TUR Period.

b. Performance Ranking. The TUR for the Year 1 TUR Period for the Partnership and each company in the Target Group shall be arranged by rank from best to worst according to the TUR achieved by each company. The total number of companies so ranked shall then be divided into four groups (“Quartiles” and each a “Quartile”). For purposes of assigning companies to Quartiles (with the 1^st Quartile being the best and the 4^th Quartile being the worst), the total number of companies ranked (including the Partnership) shall be divided into four groups as nearly equal in number as possible. The number of companies in each group shall be the total number contained in the Target Group divided by four. If the total number of companies is not evenly divisible by four, so that there is a fraction contained in such quotient, the extra company(ies) represented by such fraction will be included in one or more Quartiles as follows:

Fraction	Extra Company(ies)
¼	1st Quartile
½	1st Quartile 2nd Quartile
¾	1st Quartile 2nd Quartile 3rd Quartile

c. Vesting Percentage. The TUR Vesting Percentage for the Year 1 Annual Tranche shall be determined based on where the Partnership’s TUR during the Year 1 TUR Period falls within the following ranges:

Partnership TUR Position	TUR Vesting Percentage for Year 1 Annual Tranche
4th Quartile	0%
3rd Quartile	50%
2nd Quartile	100%
1st Quartile	150%
If the Partnership’s TUR is the highest achieved in the 1st Quartile	200%

Notwithstanding the foregoing, the Committee has full discretion to apply a TUR Vesting Percentage between 0% and 200% to the Year 1 Annual Tranche.

B. Performance Unit Vesting for the Year 2 and Year 3 Performance Periods. The Committee will designate the Performance Measures that will apply for the Year 2 Performance Period and the Year 3 Performance Period (the “Year 2 Performance Measures” and the “Year 3Performance Measures,” respectively) during the applicable year. Within the Committee’s discretion, the Year 2 Performance Measures and the Year 3 Performance Measures may result in the vesting of greater than 100% (up to 200%) of the Year 2 Annual Tranche and the Year 3 Annual Tranche, respectively. The Year 2 Performance Measures and the Year 3 Performance Measures shall be applied to the Year 2 Annual Tranche and the Year 3 Annual Tranche, respectively, to determine the Performance Units that vest with respect to the applicable Performance Period. Notwithstanding the foregoing, the Committee has full discretion to vest between 0% and 200% of the applicable Annual Tranche, regardless of the level of Performance Measures achieved for the applicable year.

5. Termination of Employment.

A. Voluntary Termination and Termination for Cause. Except for a Change of Control, if Participant’s employment is voluntarily terminated by Participant (other than through Participant’s death), or is terminated by the Company, the Partnership or any of their respective Affiliates for Cause, any Annual Tranche for a Performance Period not completed as of the date of termination shall be automatically forfeited for no consideration; provided, however, that a Participant who remains continuously employed with the Company, the Partnership or any of their respective Affiliates from the Grant Date through the last day of a Performance Period will be entitled to the Performance Units (i.e., the Performance Units in the Annual Tranche for such completed Performance Period in accordance with Section 4 and any Carried Forward Units from the immediately preceding Performance Period which are eligible to vest with respect to such completed Performance Period), whether or not Participant remains employed by the Company, the Partnership or any of their respective Affiliates until the Vesting Date applicable to the completed Performance Period.

B. Death, Disability and Termination Other Than for Cause. Except for a Change of Control, if Participant experiences a Disability (as defined below) or if Participant’s employment with the Company, the Partnership or any of their respective Affiliates is terminated by the Company, the Partnership or such Affiliate other than for Cause (at a time when Participant is otherwise willing and able to continue providing services) or as a result of Participant’s death (each, a “Triggering Event”), and the then-current Performance Period will be completed in fewer than 30 days after such Triggering Event, the Annual Tranche applicable to the then-current Performance Period (and any Carried Forward Units which are eligible to vest with respect to the then-current Performance Period)shall vest and be settled in accordance with Sections 3 and 4 as if Participant had remained employed through the last day of the Performance Period. Any Performance Units (including any Carried Forward Units) that fail to vest for the then-current Performance Period after the application of the previous sentence, including any Performance Units for any Performance Periods that would otherwise have commenced following the Triggering Date, shall be automatically and immediately forfeited for no consideration. Any Performance Units that vest pursuant to this Section 5B shall be settled as soon as administratively practicable after the Vesting Date for the then-current Performance Period and in all events no later than March 15 of the calendar year following the end of the calendar year in which the applicable Triggering Event occurs. For purposes of this Agreement, “Disabled” or “Disability” means (i) the inability of Participant to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than twelve (12) months or (ii) the receipt of income replacements by Participant, by reason of any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than twelve (12) months, for a period of not less than three (3) months under the accident and health plan of the Company, the Partnership or an applicable Affiliate thereof.

6. Change of Control. Upon a Change of Control, with respect to then-outstanding Performance Units, all applicable Performance Measures will be deemed achieved at the maximum levels applicable to such Performance Units and all such Performance Units shall automatically vest in full. Any Performance Units that vest pursuant to this Section 6 shall be settled as soon as administratively practicable after the Change of Control and in all events no later than March 15 of the calendar year following the end of the calendar year in which the Change of Control occurs.

7. Withholding. The Company, the Partnership or an applicable Affiliate will withhold any taxes due from Participant’s grant as the Company, the Partnership or an applicable Affiliate determines is required by law, which, in the sole discretion of the Committee, may include withholding a number of Performance Units or the Units issuable thereunder otherwise payable to Participant.

8. Acceptance and Acknowledgement. Participant hereby accepts and agrees to be bound by all of the terms, provisions, conditions and limitations of the Plan and any subsequent amendment or amendments thereto, as if it had been set forth verbatim in this Award. Participant shall be deemed to have timely accepted this Agreement and the terms hereof if Participant has not explicitly rejected this Agreement in writing to the Partnership within sixty (60) days after the Grant Date. Participant hereby acknowledges receipt of a copy of the Plan, this Agreement and Appendix A. Participant has read and understands the terms and provisions thereof, and accepts the Performance Units subject to all of the terms and conditions of the Plan and this Agreement. Participant acknowledges that there may be adverse tax consequences upon the vesting or settlement of the Performance Units or disposition of the underlying Units and that Participant has been advised to consult a tax advisor prior to such vesting, settlement or disposition.

9. Plan and Appendix Incorporated by Reference. The Plan and Appendix A are incorporated into this Agreement by this reference and are made a part hereof for all purposes; provided, however, that, in the event of a conflict between the Plan and this Agreement or between the Plan and Appendix A, the Plan shall control.

10. Restrictions. This Agreement and Participant’s interest in the Performance Units granted by this Agreement are of a personal nature and, except as expressly provided in this Agreement or the Plan, Participant’s rights with respect thereto may not be sold, mortgaged, pledged, assigned, alienated, transferred, conveyed or otherwise disposed of or encumbered in any manner by Participant. Any such attempted sale, mortgage, pledge, assignment, alienation, transfer, conveyance, disposition or encumbrance shall be void, and the Partnership and its Affiliates shall not be bound thereby.

NUSTAR ENERGY L.P.

By: Riverwalk Logistics, L.P., its general partner

By: NuStar GP, LLC, its general partner

By:_____________________________

Bradley C. Barron

President & Chief Executive Officer

APPENDIX A

1. No Guarantee of Tax Consequences. None of the Board, the Company, the Partnership or any Affiliate of any of the foregoing makes any commitment or guarantee that any federal, state, local or other tax treatment will (or will not) apply or be available to Participant (or to any person claiming through or on behalf of Participant) or assumes any liability or responsibility with respect to taxes and penalties and interest thereon arising hereunder with respect to Participant (or to any person claiming through or on behalf of Participant).

2. Successors and Assigns. The Partnership and its Affiliates may assign any of their respective rights under this Agreement and it shall be binding and inure to the benefit of such successors and assigns. Subject to the restrictions on transfer set forth herein, this Agreement will be binding upon Participant and Participant’s beneficiaries, executors, administrators and the person(s) to whom the Performance Units may be transferred by will or the laws of descent or distribution.

3. Governing Law. The validity, construction and effect of this Agreement shall be determined by the laws of the State of Delaware without regard to conflict of laws principles.

4. No Rights as Unitholder. Neither Participant nor any person claiming by, through or under Participant with respect to the Performance Units shall have any rights as a unitholder of the Partnership (including, without limitation, voting rights) unless and until the Performance Units vest and are settled by the issuance of Units.

5. Amendment. The Committee has the right to amend or alter this Agreement and/or the Performance Units; provided, that no such amendment shall adversely affect Participant’s material rights under this Agreement without Participant’s consent.

6. No Right to Continued Service. Neither the Plan nor this Agreement shall confer upon Participant any right to be retained in any position, as an Employee, Consultant or Director of the Company, the Partnership or any Affiliate thereof. Further, nothing in the Plan or this Agreement shall be construed to limit the discretion of the Company, the Partnership or any Affiliate thereof to terminate Participant’s service at any time, with or without Cause.

7. Notices. Any notice required to be delivered to the Partnership under this Agreement shall be in writing and addressed to the Secretary of the Company at the Company’s principal offices. Any notice required to be delivered to Participant under this Agreement shall be in writing and addressed to Participant at Participant’s address as then shown in the records of the Company, the Partnership or the applicable Affiliate. Any party hereto may designate another address in writing (or by such other method approved by the Partnership) from time to time.

8. Interpretation. Any dispute regarding the interpretation of this Agreement shall be submitted by such party to the Committee for review. The resolution of such dispute by the Committee shall be final and binding on the parties hereto.

9. Severability. The invalidity or unenforceability of any provision of the Plan or this Agreement shall not affect the validity or enforceability of any other provision of the Plan or this Agreement, and each provision of the Plan and this Agreement shall be severable and enforceable to the extent permitted by law.

APPENDIX B

Target Group

Buckeye Partners, L.P.

Crestwood Equity Partners LP

DCP Midstream, LP

Enable Midstream Partners, L.P.

Energy Transfer LP

EnLink Midstream Partners, LP

Enterprise Products Partners, LP

Genesis Energy, L.P.

Magellan Midstream Partners, L.P.

MPLX LP

NuStar Energy L.P.

ONEOK, Inc

Plains All American Pipeline, L.P.

SEMGroup Corporation

Targa Resources Corp.

EX-31.01

Exhibit 31.01

CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Bradley C. Barron, certify that:

1. I have reviewed this quarterly report on Form 10-Q of NuStar Energy L.P. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 9, 2019

/s/ Bradley C. Barron

Bradley C. Barron

President and Chief Executive Officer

EX-31.02

Exhibit 31.02

CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Thomas R. Shoaf, certify that:

1. I have reviewed this quarterly report on Form 10-Q of NuStar Energy L.P. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 9, 2019

/s/ Thomas R. Shoaf

Thomas R. Shoaf

Executive Vice President and Chief Financial Officer

EX-32.01

Exhibit 32.01

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of NuStar Energy L.P. (the Partnership) on Form 10-Q for the quarter ended June 30, 2019, as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Bradley C. Barron, President and Chief Executive Officer of NuStar GP, LLC, the general partner of the general partner of the Partnership, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

/s/ Bradley C. Barron

Bradley C. Barron

President and Chief Executive Officer

August 9, 2019

EX-32.02

Exhibit 32.02

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of NuStar Energy L.P. (the Partnership) on Form 10-Q for the quarter ended June 30, 2019, as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Thomas R. Shoaf, Executive Vice President and Chief Financial Officer of NuStar GP, LLC, the general partner of the general partner of the Partnership, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

/s/ Thomas R. Shoaf

Thomas R. Shoaf

Executive Vice President and Chief Financial Officer

August 9, 2019

XML

DEI Document - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	1-16417
Entity Registrant Name	NuStar Energy L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-2956831
Entity Address, Street	19003 IH-10 West
Entity Address, City	San Antonio
Entity Address, State	TX
Entity Address, Zip Code	78257
City Area Code	210
Entity Local Phone Number	918-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Partnership Units Outstanding		107,763,602
Entity Central Index Key	0001110805
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Limited Partner [Member]
Document Information [Line Items]
Title of 12(b) Security	Common units
Trading Symbol	NS
Security Exchange Name	NYSE
Series A Preferred Limited Partner [Member]
Document Information [Line Items]
Title of 12(b) Security	Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol	NSprA
Security Exchange Name	NYSE
Series B Preferred Limited Partner [Member]
Document Information [Line Items]
Title of 12(b) Security	Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol	NSprB
Security Exchange Name	NYSE
Series C Preferred Limited Partner [Member]
Document Information [Line Items]
Title of 12(b) Security	Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol	NSprC
Security Exchange Name	NYSE

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 15,299	$ 11,529
Accounts receivable, net of allowance for doubtful accounts of $9,452 and $9,412 as of June 30, 2019 and December 31, 2018, respectively	117,688	110,417
Inventories	9,454	8,434
Prepaid and other current assets	29,591	17,374
Assets held for sale	301,529	599,347
Total current assets	473,561	747,101
Property, plant and equipment, at cost	5,981,860	5,627,805
Accumulated depreciation and amortization	(1,961,046)	(1,853,003)
Property, plant and equipment, net	4,020,814	3,774,802
Intangible assets, net	707,344	733,056
Goodwill	1,005,853	1,005,853
Other long-term assets, net	172,119	88,328
Total assets	6,379,691	6,349,140
Current liabilities:
Accounts payable	128,547	103,122
Short-term debt and current portion of finance leases	10,087	18,500
Accrued interest payable	38,929	36,293
Accrued liabilities	69,970	74,418
Taxes other than income tax	14,060	16,823
Income tax payable	1,920	4,445
Liabilities held for sale	68,616	69,834
Total current liabilities	332,129	323,435
Long-term debt	3,456,461	3,111,996
Deferred income tax liability	12,250	12,428
Other long-term liabilities	176,951	79,558
Total liabilities	3,977,791	3,527,417
Commitments and contingencies (Note 6)
Series D preferred limited partners (23,246,650 preferred units outstanding as of June 30, 2019 and December 31, 2018) (Note 9)	572,597	563,992
Partners’ equity (Note 10):
Common limited partners (107,763,033 and 107,225,156 common units outstanding as of June 30, 2019 and December 31, 2018, respectively)	1,140,665	1,556,308
Accumulated other comprehensive loss	(67,663)	(54,878)
Total partners’ equity	1,829,303	2,257,731
Total liabilities, mezzanine equity and partners’ equity	6,379,691	6,349,140
Series A Preferred Limited Partner [Member]
Partners’ equity (Note 10):
Preferred limited partners	218,307	218,307
Series B Preferred Limited Partner [Member]
Partners’ equity (Note 10):
Preferred limited partners	371,476	371,476
Series C Preferred Limited Partner [Member]
Partners’ equity (Note 10):
Preferred limited partners	$ 166,518	$ 166,518

XML

CONSOLIDATED BALANCE SHEETS Non-Printing - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 9,452	$ 9,412
Series D preferred units outstanding	23,246,650	23,246,650
Limited partners common units outstanding (in units)	107,763,033	107,225,156
Series A Preferred Limited Partner [Member]
Preferred units outstanding	9,060,000	9,060,000
Series B Preferred Limited Partner [Member]
Preferred units outstanding	15,400,000	15,400,000
Series C Preferred Limited Partner [Member]
Preferred units outstanding	6,900,000	6,900,000

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total revenues	$ 372,445	$ 389,256	$ 720,271	$ 765,983
Costs and expenses:
Operating expenses (excluding depreciation and amortization expense)	101,095	102,241	196,506	190,320
Depreciation and amortization expense	64,991	61,777	129,809	121,601
General and administrative expenses (excluding depreciation and amortization expense)	24,868	26,754	50,559	44,896
Other depreciation and amortization expense	1,819	2,158	3,938	4,197
Total costs and expenses	279,162	312,869	553,383	606,103
Operating income	93,283	76,387	166,888	159,880
Interest expense, net	(45,693)	(48,389)	(89,984)	(95,777)
Other income, net	621	1,607	1,412	2,623
Income (loss) from continuing operations before income tax expense	48,211	29,605	78,316	66,726
Income tax expense	1,296	2,696	2,478	6,584
Income from continuing operations, net of tax	46,915	26,909	75,838	60,142
(Loss) income from discontinued operations, net of tax	(964)	2,490	(307,750)	95,390
Net income (loss)	$ 45,951	$ 29,399	$ (231,912)	$ 155,532
Basic net income (loss) per common unit (Note 11):
Continuing operations	$ 0.11	$ 0.12	$ 0.05	$ 0.30
Discontinued operations	(0.01)	0.03	(2.86)	1.00
Total net income (loss) per common unit	$ 0.10	$ 0.15	$ (2.81)	$ 1.30
Basic weighted-average common units outstanding	107,763,016	93,192,238	107,647,957	93,187,038
Comprehensive income (loss)	$ 37,992	$ 26,778	$ (244,697)	$ 173,835
Service [Member]
Revenues:
Total revenues	282,472	259,599	541,499	507,668
Costs and expenses:
Total costs associated with service revenues/Cost of product sales	166,086	164,018	326,315	311,921
Product [Member]
Revenues:
Total revenues	89,973	129,657	178,772	258,315
Costs and expenses:
Total costs associated with service revenues/Cost of product sales	$ 86,389	$ 119,939	$ 172,571	$ 245,089

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ (231,912)	$ 155,532
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization expense	142,283	147,879
Unit-based compensation expense	5,774	4,277
Amortization of debt related items	2,643	3,965
Gain from sale or disposition of assets	(1,300)	(1,218)
Asset impairment losses	305,715	0
Goodwill impairment loss	31,123	0
Gain from insurance recoveries	0	(78,756)
Deferred income tax (benefit) expense	(575)	1,142
Changes in current assets and current liabilities (Note 12)	(36,229)	42,733
Decrease (increase) in other long-term assets	15,190	(11,224)
Increase (decrease) in other long-term liabilities	9,157	(20,073)
Other, net	(975)	(407)
Net cash provided by operating activities	240,894	243,850
Cash flows from investing activities:
Capital expenditures	(319,961)	(248,521)
Change in accounts payable related to capital expenditures	16,144	(19,320)
Proceeds from sale or disposition of assets	143	2,097
Proceeds from insurance recoveries	0	78,419
Acquisitions	0	(37,502)
Net cash used in investing activities	(303,674)	(224,827)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	415,800	677,272
Proceeds from short-term debt borrowings	178,500	456,000
Proceeds from note offering, net of issuance costs	491,665	0
Long-term debt repayments	(616,800)	(905,521)
Short-term debt repayments	(191,000)	(428,000)
Proceeds from issuance of Series D preferred units	0	400,000
Payment of issuance costs for Series D preferred units	0	(29,289)
Issuance of common units	0	10,000
Distributions to preferred unitholders	(60,846)	(32,713)
Distributions to common unitholders and general partner	(129,025)	(172,324)
Proceeds from termination of interest rate swaps	0	8,048
Payment of tax withholding for unit-based compensation	(6,368)	(69)
Decrease in cash book overdrafts	(4,718)	(436)
Other, net	(3,451)	(5,518)
Net cash provided by (used in) financing activities	73,757	(22,550)
Effect of foreign exchange rate changes on cash	261	(421)
Net increase (decrease) in cash, cash equivalents and restricted cash	11,238	(3,948)
Cash, cash equivalents and restricted cash as of the beginning of the period	13,644	24,292
Cash, cash equivalents and restricted cash as of the end of the period	$ 24,882	$ 20,344

XML

CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY AND MEZZANINE EQUITY - USD ($) $ in Thousands	Total	AOCI [Member]	Preferred Limited Partner [Member]	Series D Preferred Limited Partner [Member]	Common Limited Partner [Member]	General Partner [Member]	General Partner and Common Limited Partners [Member]
Partners' capital - beginning balance at Dec. 31, 2017	$ 2,480,089	$ (84,927)	$ 756,603		$ 1,770,587	$ 37,826
Temporary equity - beginning balance at Dec. 31, 2017	0
Partners' capital and temporary equity - beginning balance at Dec. 31, 2017	2,480,089
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	155,532	0	32,023		120,831	2,466
Net income (loss) excluding portion attributable to temporary equity	155,320
Net income, temporary equity				$ 212
Other comprehensive income (loss)	18,303	18,303	0		0	0
Cash distributions to partners			(32,023)		(157,945)	(14,379)	$ (172,324)
Cash distributions to partners, temporary equity				(212)
Issuance of common units, including contribution from general partner	10,204	0	0		10,000	204
Issuance of Series D preferred units	370,711			370,711
Unit-based compensation	3,051	0	0		3,051	0
Series D Preferred Unit accretion, common	0
Other	(6,143)	0	(269)		(5,756)	(118)
Other, temporary equity				0
Other, including temporary equity	(6,143)
Partners' capital - ending balance at Jun. 30, 2018	2,456,477	(66,624)	756,334		$ 1,740,768	25,999
Temporary equity - ending balance at Jun. 30, 2018	370,711
Partners' capital and temporary equity - ending balance at Jun. 30, 2018	2,827,188
Increase (Decrease) in Partners' Capital [Roll Forward]
Cash distributions paid, per unit					$ 1.695
Partners' capital - beginning balance at Mar. 31, 2018	2,492,057	(64,003)	756,494		$ 1,772,874	26,692
Temporary equity - beginning balance at Mar. 31, 2018	0
Partners' capital and temporary equity - beginning balance at Mar. 31, 2018	2,492,057
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	29,399	0	16,033		12,891	263
Net income (loss) excluding portion attributable to temporary equity	29,187
Net income, temporary equity				212
Other comprehensive income (loss)	(2,621)	(2,621)	0		0	0
Cash distributions to partners			(16,033)		(55,911)	(1,141)	$ (57,052)
Cash distributions to partners, temporary equity				(212)
Issuance of common units, including contribution from general partner	10,204	0	0		10,000	204
Issuance of Series D preferred units	370,711			370,711
Unit-based compensation	1,765	0	0		1,765	0
Series D Preferred Unit accretion, common	0
Other	(1,030)	0	(160)		(851)	(19)
Other, temporary equity				0
Other, including temporary equity	(1,030)
Partners' capital - ending balance at Jun. 30, 2018	2,456,477	(66,624)	756,334		$ 1,740,768	$ 25,999
Temporary equity - ending balance at Jun. 30, 2018	370,711
Partners' capital and temporary equity - ending balance at Jun. 30, 2018	2,827,188
Increase (Decrease) in Partners' Capital [Roll Forward]
Cash distributions paid, per unit					$ 0.60
Partners' capital - beginning balance at Dec. 31, 2018	2,257,731	(54,878)	756,301		$ 1,556,308
Temporary equity - beginning balance at Dec. 31, 2018	563,992
Partners' capital and temporary equity - beginning balance at Dec. 31, 2018	2,821,723
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	(231,912)	0	32,066		(292,758)
Net income (loss) excluding portion attributable to temporary equity	(260,692)
Net income, temporary equity				28,780
Other comprehensive income (loss)	(12,785)	(12,785)	0		0
Cash distributions to partners			(32,066)		(129,025)
Cash distributions to partners, temporary equity				(28,780)
Unit-based compensation	15,686	0	0		15,686
Series D Preferred Unit accretion, common	(8,748)				(8,748)
Series D Preferred Unit accretion, preferred				8,748
Series D Preferred Unit accretion, total	0
Other	(798)	0	0		(798)
Other, temporary equity				(143)
Other, including temporary equity	(941)
Partners' capital - ending balance at Jun. 30, 2019	1,829,303	(67,663)	756,301		$ 1,140,665
Temporary equity - ending balance at Jun. 30, 2019	572,597
Partners' capital and temporary equity - ending balance at Jun. 30, 2019	2,401,900
Increase (Decrease) in Partners' Capital [Roll Forward]
Cash distributions paid, per unit					$ 1.20
Partners' capital - beginning balance at Mar. 31, 2019	1,888,677	(59,704)	756,301		$ 1,192,080
Temporary equity - beginning balance at Mar. 31, 2019	568,293
Partners' capital and temporary equity - beginning balance at Mar. 31, 2019	2,456,970
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	45,951	0	16,033		15,528
Net income (loss) excluding portion attributable to temporary equity	31,561
Net income, temporary equity				14,390
Other comprehensive income (loss)	(7,959)	(7,959)	0		0
Cash distributions to partners			(16,033)		(64,658)
Cash distributions to partners, temporary equity				(14,390)
Unit-based compensation	2,146	0	0		2,146
Series D Preferred Unit accretion, common	(4,446)				(4,446)
Series D Preferred Unit accretion, preferred				4,446
Series D Preferred Unit accretion, total	0
Other	15	0	0		15
Other, temporary equity				$ (142)
Other, including temporary equity	(127)
Partners' capital - ending balance at Jun. 30, 2019	1,829,303	$ (67,663)	$ 756,301		$ 1,140,665
Temporary equity - ending balance at Jun. 30, 2019	572,597
Partners' capital and temporary equity - ending balance at Jun. 30, 2019	$ 2,401,900
Increase (Decrease) in Partners' Capital [Roll Forward]
Cash distributions paid, per unit					$ 0.60

XML

ORGANIZATION AND BASIS OF PRESENTATION

6 Months Ended

Jun. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION AND BASIS OF PRESENTATION

ORGANIZATION AND BASIS OF PRESENTATION

Organization and Operations

NuStar Energy L.P. (NYSE: NS) is a publicly held Delaware limited partnership engaged in the transportation of petroleum products and anhydrous ammonia, and the terminalling, storage and marketing of petroleum products. Unless otherwise indicated, the terms “NuStar Energy,” “NS,” “the Partnership,” “we,” “our” and “us” are used in this report to refer to NuStar Energy L.P., to one or more of our consolidated subsidiaries or to all of them taken as a whole.

On July 20, 2018, we completed the merger of NuStar GP Holdings, LLC (NuStar GP Holdings or NSH) with a subsidiary of NS. Consequently, NSH, which indirectly owns our general partner, became a wholly owned subsidiary of ours. Under the terms of the merger agreement, NSH unitholders received 0.55 of a common unit representing a limited partner interest in NS in exchange for each NSH unit owned at the effective time of the merger, resulting in approximately 13.4 million incremental NS common units outstanding after the merger.

We conduct our operations through our subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and NuStar Pipeline Operating Partnership L.P. (NuPOP). We have three business segments: pipeline, storage and fuels marketing.

Recent Developments

On July 29, 2019, we closed on the sale of the equity interests in our wholly owned subsidiaries that own the St. Eustatius terminal and bunkering operations for approximately $250.0 million, subject to adjustment. Please refer to Note 3 for additional discussion.

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. Operating results for the three and six months ended June 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018.

We have reclassified certain previously reported amounts in the consolidated financial statements and notes to conform to current-period presentation. As further discussed in Note 3, we reclassified certain balances to assets and liabilities held for sale and certain revenues and expenses to discontinued operations. The consolidated statements of cash flows have not been adjusted to separately disclose cash flows related to discontinued operations.

New Accounting Policy

As of June 30, 2019, we have restricted cash representing legally restricted funds that are unavailable for general use totaling $8.7 million, which is included in “Prepaid and other current assets” on the consolidated balance sheet.

XML

NEW ACCOUNTING PRONOUNCEMENTS

6 Months Ended

Jun. 30, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS

Securities and Exchange Commission Disclosure Update and Simplification

In August 2018, the Securities and Exchange Commission (SEC) issued final rules regarding disclosure requirements that were redundant, duplicative, overlapping or superseded by other SEC requirements or GAAP. The final rules primarily eliminated or reduced certain disclosure requirements, although they also required some additional disclosures. The guidance became effective on November 5, 2018, with an exception for the new disclosure requirement to present changes in partners’ equity in interim periods, which permits entities to begin disclosing this information in the quarter that begins after the effective date of the final rules. We elected to utilize this exception, and began presenting statements of partners’ equity on an interim basis beginning with the quarter ending March 31, 2019. These final rules did not have an impact on our financial position or results of operations.

Cloud Computing Arrangements

In August 2018, the Financial Accounting Standards Board (FASB) issued guidance addressing a customer’s accounting for implementation costs incurred in a cloud computing arrangement (CCA) that is considered a service contract. Under the new guidance, implementation costs for a CCA should be evaluated for capitalization using the same approach as implementation costs associated with internal-use software and expensed over the term of the hosting arrangement. The guidance is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. Prospective adoption for eligible costs incurred on or after the date of adoption or retrospective adoption are permitted. We are currently evaluating whether we will adopt these provisions early and whether we will elect prospective or retrospective adoption, but we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures.

Disclosures for Defined Benefit Plans

In August 2018, the FASB issued amended guidance that makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. The guidance is effective for annual periods beginning after December 15, 2020, with early adoption permitted, using a retrospective approach. We are currently evaluating whether we will adopt these provisions early, but we do not expect the guidance to have a material impact on our financial position, results of operations or disclosures.

Goodwill

In January 2017, the FASB issued amended guidance that simplifies the accounting for goodwill impairment by eliminating step 2 of the goodwill impairment test. Under the amended guidance, goodwill impairment will be measured as the excess of the reporting unit’s carrying value over its fair value, not to exceed the carrying amount of goodwill for that reporting unit. The changes are effective for annual and interim periods beginning after December 15, 2019, and amendments should be applied prospectively. Early adoption is permitted for any impairment tests performed after January 1, 2017. We adopted the amended guidance during the first quarter of 2019 and applied the guidance to the goodwill impairment discussed in Note 3.

Credit Losses

In June 2016, the FASB issued amended guidance that requires the use of a “current expected loss” model for financial assets measured at amortized cost and certain off-balance sheet credit exposures. Under this model, entities will be required to estimate the lifetime expected credit losses on such instruments based on historical experience, current conditions, and reasonable and supportable forecasts. This amended guidance also expands the disclosure requirements to enable users of financial statements to understand an entity’s assumptions, models and methods for estimating expected credit losses. The changes are effective for annual and interim periods beginning after December 15, 2019, and amendments should be applied using a modified retrospective approach. We currently expect to adopt the amended guidance on January 1, 2020, and we are assessing the impact of this amended guidance on our financial position, results of operations and disclosures. We plan to provide additional information about the expected impact at a future date.

Leases

In February 2016, the FASB issued amended guidance that requires lessees to recognize the assets and liabilities that arise from most leases on the balance sheet. For lessors, this amended guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. The changes are effective for annual and interim periods beginning after December 15, 2018, and amendments should be applied using one of two modified retrospective transition methods. We adopted these provisions on January 1, 2019 through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The transition adjustment related to the adoption was immaterial, and we do not expect the adoption of this guidance to impact the results of our operations going forward. Please refer to Note 7 for further discussion.

XML

DISCONTINUED OPERATIONS AND IMPAIRMENTS

6 Months Ended

Jun. 30, 2019

Discontinued Operations and Disposal Groups [Abstract]

DISCONTINUED OPERATIONS AND IMPAIRMENTS

DISCONTINUED OPERATIONS AND IMPAIRMENTS

On May 9, 2019, we entered into a Share Purchase and Sale Agreement to sell the equity interests in our wholly owned subsidiaries that own the St. Eustatius terminal and bunkering operations (the St. Eustatius Operations), for approximately $250.0 million, subject to adjustment (the St. Eustatius Disposition). The St. Eustatius Disposition included a 14.3 million barrel storage and terminalling facility and related assets on the island of St. Eustatius in the Caribbean Netherlands. We closed the sale on July 29, 2019 and received net proceeds of approximately $234.0 million. We previously reported the terminal operations in our storage segment and the bunkering operations in our fuels marketing segment.

On November 30, 2018, we sold our European operations, which consisted of six liquids storage terminals in the United Kingdom and one facility in Amsterdam and related assets that were previously reported in our storage segment (the European Operations), for approximately $270.0 million (the European Disposition).

During the second quarter of 2019, we determined the assets and liabilities associated with the St. Eustatius Operations met the criteria to be classified as held for sale. We also determined the St. Eustatius Operations and the European Operations met the requirements to be reported as discontinued operations since the St. Eustatius Disposition and the European Disposition together represent a strategic shift that will have a major impact on our operations and financial results. These sales are part of our plan to improve our debt metrics and partially fund capital projects to grow our core business in North America. Accordingly, the consolidated balance sheets reflect the assets and liabilities associated with the St. Eustatius Operations as held for sale for all periods presented, and the condensed consolidated statements of comprehensive income reflect the St. Eustatius Operations and the European Operations as discontinued operations for all applicable periods presented.

Discontinued Operations

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars)
Revenues	$	92,837		$	96,948		$	231,480		$	196,102
Costs and expenses:
Cost of revenues	86,278			92,177			202,880			174,633
Impairment losses	8,398			—			336,838			—
General and administrative expenses (excluding depreciation and amortization expense)	305			1,227			610			2,859
Other depreciation and amortization expense	—			93			—			172
Total costs and expenses	94,981			93,497			540,328			177,664
Operating (loss) income	(2,144		)	3,451			(308,848		)	18,438
Interest income (expense), net	9			(547		)	32			(931		)
Other income (expense), net	1,171			(195		)	1,167			78,541
(Loss) income from discontinued operations before income tax expense	(964		)	2,709			(307,649		)	96,048
Income tax expense	—			219			101			658
(Loss) income from discontinued operations, net of tax	$	(964	)	$	2,490		$	(307,750	)	$	95,390

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

	Six Months Ended June 30,
	2019			2018
	(Thousands of Dollars)
Capital expenditures	$	(23,635	)	$	(82,111	)
Significant noncash operating activities:
Depreciation and amortization expense	$	8,536		$	22,081
Asset impairment losses	$	305,715		$	—
Goodwill impairment loss	$	31,123		$	—
Gain from insurance recoveries	$	—		$	(78,756	)

Impairments

On January 28, 2019, the U.S. Department of the Treasury’s Office of Foreign Assets Control added Petroleos de Venezuela, S.A. (PDVSA), at the time a customer at our St. Eustatius facility, to its List of Specially Designated Nationals and Blocked Persons (the SDN List). The inclusion of PDVSA on the SDN List required us to wind down our contracts with PDVSA. Prior to winding down such contracts, PDVSA was the St. Eustatius terminal’s largest customer.

The effect of the sanctions issued against PDVSA, combined with the progression in the sale negotiations that occurred during March 2019, resulted in triggering events that caused us to evaluate the long-lived assets and goodwill associated with the St. Eustatius terminal and bunkering operations for potential impairment.

With respect to the terminal operations long-lived assets, our estimates of future expected cash flows included the possibility of a near-term sale, as well as continuing to operate the terminal. The carrying value of the terminal’s long-lived assets exceeded our estimate of the total expected cash flows, indicating the long-lived assets were potentially impaired. To determine an impairment amount, we estimated the fair value of the long-lived assets for comparison to the carrying amount of those assets. Our estimate of the fair value considered the expected sales price as well as estimates generated from income and market approaches using a market participant’s assumptions. The estimated fair values resulting from the market and income approaches were consistent with the expected sales price. Therefore, we concluded that the estimated sales price, which was less than the carrying amount of the long-lived assets, represented the best estimate of fair value at March 31, 2019, and we recorded a long-lived asset impairment charge of $297.3 million in the first quarter of 2019 to reduce the carrying value of the assets to their estimated fair value. We recorded an additional impairment charge of $8.4 million in the second quarter of 2019, mainly due to additional capital expenditures incurred in the second quarter. Our estimate of the fair value is based on a transaction price in a market that is not active and thus falls within Level 2 of the fair value hierarchy.

With respect to the goodwill in the Statia Bunkering reporting unit, which consists of our bunkering operations at our St. Eustatius terminal facility, we estimated the fair value based on the expected sales price discussed above, which is inclusive of the bunkering operations. As a result, we concluded the goodwill was impaired. Consistent with FASB’s amended goodwill impairment guidance discussed in Note 2, which we adopted in the first quarter of 2019, we measured the goodwill impairment as the difference between the reporting unit’s carrying value and its fair value. Therefore, we recognized a goodwill impairment charge of $31.1 million in the first quarter of 2019 to reduce the goodwill to $0.

The impairment charges are included in “(Loss) income from discontinued operations, net of tax” on the condensed consolidated statements of comprehensive income (loss).

Assets and Liabilities Held for Sale

The following is a reconciliation of the carrying amounts of the major classes of assets and liabilities included in “Assets held for sale” and “Liabilities held for sale” on the consolidated balance sheets:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Total current assets	$	46,826	$	54,404
Property, plant and equipment, net	223,723		513,820
Goodwill	—		31,123
Other long-term assets, net	30,980		—
Assets held for sale	$	301,529	$	599,347
Total current liabilities	$	44,625	$	69,834
Total long-term liabilities	23,991		—
Liabilities held for sale	$	68,616	$	69,834

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

REVENUE FROM CONTRACTS WITH CUSTOMERS [Text Block]

REVENUE FROM CONTRACTS WITH CUSTOMERS

Contract Assets and Contract Liabilities

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

	2019						2018
	Contract Assets			Contract Liabilities			Contract Assets			Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,066		$	(21,579	)	$	1,956		$	(13,801	)
Noncurrent portion	539			(38,945		)	171			(46,361		)
Held for sale	—			(25,357		)	—			(302		)
Total	2,605			(85,881		)	2,127			(60,464		)
Activity:
Additions	2,674			(24,537		)	879			(20,820		)
Transfer to accounts receivable	(2,638		)	—			(2,397		)	—
Transfer to revenues, including amounts reported in discontinued operations	—			46,757			—			28,466
Total	36			22,220			(1,518		)	7,646
Balances as of June 30:
Current portion	1,483			(23,688		)	327			(17,881		)
Noncurrent portion	1,158			(39,973		)	282			(34,669		)
Held for sale	—			—			—			(268		)
Total	$	2,641		$	(63,661	)	$	609		$	(52,818	)

As previously discussed in Note 3, the inclusion of PDVSA on the SDN List prevents us from providing services to PDVSA until such time as these sanctions are lifted or otherwise modified. As a result, in the first quarter of 2019 we accelerated the recognition of revenue totaling $16.3 million, representing the amount remaining from a third quarter 2018 settlement we entered into with PDVSA.

Remaining Performance Obligations

The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of June 30, 2019 (in thousands of dollars):

2019 (remaining)	$	252,055
2020	422,044
2021	290,290
2022	241,784
2023	172,720
Thereafter	332,782
Total	$	1,711,675

Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to service customer contracts that have fixed pricing and fixed volume terms and conditions, generally including contracts with payment obligations for take-or-pay minimum volume commitments. The revenue shown above includes $9.4 million relating to the St. Eustatius Operations that were sold on July 29, 2019.

Disaggregation of Revenues

The following table disaggregates our revenues:

	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019			2018
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	77,293	$	60,507		$	145,771		$	113,944
Refined products and ammonia pipelines	92,534		89,769			177,640			173,068
Total pipeline segment revenues from contracts with customers	169,827		150,276			323,411			287,012
Lessor revenues	2,666		—			5,333			54
Total pipeline segment revenues	172,493		150,276			328,744			287,066
Storage segment:
Throughput terminals	23,170		20,140			44,856			40,157
Storage terminals	77,039		84,718			148,660			166,159
Total storage segment revenues from contracts with customers	100,209		104,858			193,516			206,316
Lessor revenues	10,194		9,962			20,387			19,924
Total storage segment revenues	110,403		114,820			213,903			226,240
Fuels marketing segment:
Revenues from contracts with customers	89,549		124,293			177,628			252,951
Consolidation and intersegment eliminations	—		(133		)	(4		)	(274		)
Total revenues	$	372,445	$	389,256		$	720,271		$	765,983

XML

DEBT

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

DEBT

DEBT

Revolving Credit Agreement

As of June 30, 2019, we had $543.0 million outstanding under our $1.4 billion revolving credit agreement (the Revolving Credit Agreement). The Revolving Credit Agreement bears interest, at our option, based on an alternative base rate, a LIBOR-based rate or a EURIBOR-based rate. The interest rate on the Revolving Credit Agreement is subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. In the second quarter of 2019, our credit rating was downgraded by S&P Global Ratings from BB to BB-, and our outlook was changed from negative to stable by S&P Global Ratings, Moody’s Investor Service Inc. and Fitch, Inc. However, per the terms of the Revolving Credit Agreement, these changes did not impact the interest rate on our Revolving Credit Agreement, which is the only debt arrangement with an interest rate that is subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. As of June 30, 2019, our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 4.4%.

For the rolling period of four quarters ending June 30, 2019, the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) could not exceed 5.00-to-1.00 and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00. The maximum consolidated debt coverage ratio and minimum consolidated interest coverage ratio requirements may limit the amount we can borrow under the Revolving Credit Agreement to an amount less than the total amount available for borrowing. As of June 30, 2019, we had $853.5 million available for borrowing, and we believe that we are in compliance with the covenants in the Revolving Credit Agreement.

Receivables Financing Agreement

NuStar Energy and NuStar Finance LLC (NuStar Finance), a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $125.0 million receivables financing agreement with third-party lenders (the Receivables Financing

Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (collectively with the Receivables Financing Agreement, the Securitization Program). On April 29, 2019, we amended the Receivables Financing Agreement to extend the scheduled termination date from September 20, 2020 to September 20, 2021 and to amend certain provisions with respect to receivables related to certain customers. NuStar Finance’s sole activity consists of purchasing receivables from NuStar Energy’s wholly owned subsidiaries that participate in the Securitization Program and providing these receivables as collateral for NuStar Finance’s revolving borrowings under the Securitization Program. NuStar Finance is a separate legal entity and the assets of NuStar Finance, including these accounts receivable, are not available to satisfy the claims of creditors of NuStar Energy, its subsidiaries selling receivables under the Securitization Program or their affiliates. The amount available for borrowing is based on the availability of eligible receivables and other customary factors and conditions.

Borrowings by NuStar Finance under the Receivables Financing Agreement bear interest at the applicable bank rate, as defined under the Receivables Financing Agreement. The weighted average interest rate related to outstanding borrowings under the Securitization Program as of June 30, 2019 was 3.3%. As of June 30, 2019, $100.3 million of our accounts receivable are included in the Securitization Program. The amount of borrowings outstanding under the Receivables Financing Agreement totaled $62.8 million as of June 30, 2019, which is included in “Long-term debt” on the consolidated balance sheet.

Issuance of Debt

On May 22, 2019, NuStar Logistics issued $500.0 million of 6.0% senior notes due June 1, 2026. We received net proceeds of approximately $491.7 million, which we initially used to repay outstanding borrowings under our Revolving Credit Agreement. The interest on the 6.0% senior notes is payable semi-annually in arrears on June 1 and December 1 of each year, beginning on December 1, 2019. The 6.0% senior notes do not have sinking fund requirements. These notes rank equally with existing senior unsecured indebtedness and senior to existing subordinated indebtedness of NuStar Logistics. The 6.0% senior notes contain restrictions on NuStar Logistics’ ability to incur secured indebtedness unless the same security is also provided for the benefit of holders of the senior notes. In addition, the senior notes limit NuStar Logistics’ ability to incur indebtedness secured by certain liens, engage in certain sale-leaseback transactions and engage in certain consolidations, mergers or asset sales. The 6.0% senior notes are fully and unconditionally guaranteed by NuStar Energy and NuPOP.

At the option of NuStar Logistics, the 6.0% senior notes may be redeemed in whole or in part at any time at a redemption price, plus accrued and unpaid interest to the redemption date. If we undergo a change of control, as defined in the supplemental indenture, each holder of the notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes repurchased, plus any accrued and unpaid interest to the date of repurchase.

XML

COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIESWe have contingent liabilities resulting from various litigation, claims and commitments. We record accruals for loss contingencies when losses are considered probable and can be reasonably estimated. Legal fees associated with defending the Partnership in legal matters are expensed as incurred. We accrued $2.8 million for contingent losses as of June 30, 2019 and December 31, 2018. The amount that will ultimately be paid related to such matters may differ from the recorded accruals, and the timing of such payments is uncertain. We evaluate each contingent loss at least quarterly, and more frequently as each matter progresses and develops over time, and we do not believe that the resolution of any particular claim or proceeding, or all matters in the aggregate, would have a material adverse effect on our results of operations, financial position or liquidity.

XML

LEASE ASSETS AND LIABILITIES

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

LEASE ASSETS AND LIABILITIES [Text Block]

LEASE ASSETS AND LIABILITIES

Transition

On January 1, 2019, we adopted Accounting Standards Codification Topic 842, “Leases” (ASC Topic 842) using the modified retrospective method. Results for reporting periods beginning after January 1, 2019 are presented under ASC Topic 842. In accordance with the modified retrospective approach, prior period amounts were not adjusted and are reported under ASC Topic 840, “Leases.” As a result of the adoption of ASC Topic 842, we recorded right-of-use assets and lease liabilities of approximately $207.0 million and $192.0 million, respectively, as of January 1, 2019. The adoption of ASC Topic 842 had an immaterial impact on our results of operations and cash flows.

We elected the following practical expedients permitted under the transition guidance within the new standard:

• the package of practical expedients, which, among other things, allowed us to carry forward historical lease classification;

• the practical expedient specifically related to land easements, which, among other things, allowed us to carry forward our historical accounting treatment for existing land easement agreements;

• the lessee practical expedient to combine lease and non-lease components for all of our asset classes except the other pipeline and terminal equipment asset class; and

• the lessor practical expedient to combine lease and non-lease components and to account for the transaction based on the predominant component (i.e., ASC Topic 842 or ASC Topic 606, “Revenue from Contracts with Customers”). We apply this expedient to certain contracts in which we agree to provide both storage capacity and optional services to customers.

We record all leases on our consolidated balance sheet except for those leases with an initial term of 12 months or less, which are expensed on a straight-line basis over the lease term. We use judgment in determining the reasonably certain lease term and consider factors such as the nature and utility of the leased asset, as well as the importance of the leased asset to our operations. We calculate the present value of our lease liabilities based upon our incremental borrowing rate unless the rate implicit in the lease is readily determinable.

Lessee Arrangements

Our operating leases consist primarily of leases for tugs and barges utilized at the St. Eustatius facility for bunker fuel sales and land and dock leases at various terminal facilities. Tug and barge leases have remaining terms of 1 year to 9 years and include options to extend up to 10 years, and land and dock leases have remaining terms generally ranging from 3 years to 17 years and include options to extend up to 15 years. We are reasonably certain to exercise options to extend our land and dock leases.

The primary component of our finance lease portfolio is a dock at a terminal facility, which includes a commitment for minimum dockage and wharfage throughput volumes. The dock lease has a remaining initial term of 2 years and four additional five-year renewal periods, all of which we are reasonably certain to exercise. We historically accounted for the dock lease under legacy build-to-suit accounting guidance, which was eliminated by ASC Topic 842.

Certain of our leases are subject to variable payment arrangements, the most notable of which include:

• dockage and wharfage charges, which are based on volumes moved over leased docks and are included in our calculation of our lease payments based on minimum throughput volume requirements. We recognize charges on excess throughput volumes in profit or loss in the period in which the obligation for those payments is incurred; and

• consumer price index adjustments, which are measured and included in the calculation of our lease payments based on the consumer price index at the adoption date or, after adoption, at the commencement date. We recognize changes in lease payments as a result of changes in the consumer price index in profit or loss in the period in which those payments are made.

As of June 30, 2019, right-of-use assets and lease liabilities included in our consolidated balance sheet were as follows:

	Balance Sheet Location	June 30, 2019
		(Thousands of Dollars)
Right-of-Use Assets:
Operating	Other long-term assets, net	$	86,414
Operating	Assets held for sale	$	30,980
Finance	Property, plant and equipment, net of accumulated amortization of $1,741	$	73,982
Lease Liabilities:
Operating:
Current	Accrued liabilities	$	11,832
Current	Liabilities held for sale	31,681
Noncurrent	Other long-term liabilities	73,723
Total operating lease liabilities		$	117,236
Finance:
Current	Short-term debt and current portion of finance leases	$	4,087
Noncurrent	Long-term debt	55,241
Total finance lease liabilities		$	59,328

As of June 30, 2019, maturities of our operating and finance lease liabilities were as follows:

	Operating Leases		Finance Leases
	(Thousands of Dollars)
2019 (remaining)	$	13,042	$	3,022
2020	17,053		6,044
2021	13,180		4,594
2022	12,622		3,939
2023	11,654		3,896
Thereafter	79,789		63,281
Total lease payments	$	147,340	$	84,776
Less: Interest	30,104		25,448
Present value of lease liabilities	$	117,236	$	59,328

Costs incurred for leases were as follows:

	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
	(Thousands of Dollars)
Operating lease cost	$	9,477	$	18,941
Finance lease cost:
Amortization of right-of-use assets	900		1,741
Interest expense on lease liability	550		1,099
Short-term lease cost	5,609		9,923
Variable lease cost	977		1,788
Total lease cost	$	17,513	$	33,492

The table below presents additional information regarding our leases:

	Operating Leases			Finance Leases
	(Thousands of Dollars, Except Term and Rate Data)
For the six months ended June 30, 2019:
Cash outflows from operating activities	$	18,710		$	916
Cash outflows from financing activities				$	1,569
Right-of-use assets obtained in exchange for lease liabilities	$	1,352		$	1,452
As of June 30, 2019:
Weighted-average remaining lease term (in years)	13			22
Weighted-average discount rate	3.6		%	3.7		%

Lessor Arrangements

We have entered into certain revenue arrangements where we are considered to be the lessor. Under the largest of these arrangements, we lease certain of our storage tanks in exchange for a fixed fee, subject to an annual consumer price index adjustment. The operating leases commenced on January 1, 2017, and have initial terms of 10 years with successive automatic renewal terms. We recognized lease revenues from these leases of $20.4 million for the six months ended June 30, 2019, which are included in “Service revenues” in the consolidated statements of income. As of June 30, 2019, we expect to receive minimum lease payments totaling $293.0 million, based upon the consumer price index as of the adoption date. We will recognize these payments ratably over the remaining initial lease term. As of June 30, 2019, the cost and accumulated depreciation of lease storage assets, which are included in our “Pipeline, storage and terminals” asset class within property, plant and equipment and have an estimated useful life of 30 years, total $233.4 million and $117.3 million, respectively.

XML

DERIVATIVES AND FAIR VALUE MEASUREMENTS

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVES AND FAIR VALUE MEASUREMENTS

DERIVATIVES AND FAIR VALUE MEASUREMENTS

Derivative Instruments

We utilize various derivative instruments to manage our exposure to interest rate risk and commodity price risk. Our risk management policies and procedures are designed to monitor interest rates, futures and swap positions and over-the-counter positions, as well as physical commodity volumes, grades, locations and delivery schedules, to help ensure that our hedging activities address our market risks. Derivative financial instruments associated with commodity price risk with respect to our petroleum product inventories and related firm commitments to purchase and/or sell such inventories were not material for any periods presented.

Interest Rate Risk. We are a party to certain interest rate swap agreements to manage our exposure to changes in interest rates, which include forward-starting interest rate swap agreements related to a forecasted debt issuance in 2020. We entered into these swaps in order to hedge the risk of fluctuations in the required interest payments attributable to changes in the benchmark interest rate during the period from the effective date of the swap to the issuance of the forecasted debt. Under the terms of the swaps, we pay a fixed rate and receive a rate based on the three-month USD LIBOR. These swaps qualify as cash flow hedges, and we designate them as such. We record the effective portion of mark-to-market adjustments as a component of “Accumulated other comprehensive 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 June 30, 2019 and December 31, 2018, the aggregate notional amount of forward-starting interest rate swaps totaled $250.0 million.

The fair values of our interest rate swaps included in our consolidated balance sheets were as follows:

	Asset Derivatives				Liability Derivatives
Balance Sheet Location	June 30, 2019		December 31, 2018		June 30, 2019			December 31, 2018
	(Thousands of Dollars)
Other long-term assets, net	$	—	$	627	$	—		$	—
Other long-term liabilities	$	—	$	—	$	(16,716	)	$	(751	)

Our interest rate swaps had the following impact on earnings:

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars)
(Loss) gain recognized in other comprehensive income (loss) on derivative	$	(9,784	)	$	5,106		$	(16,592	)	$	22,527
Loss reclassified from AOCI into interest expense, net	$	(1,005	)	$	(1,162	)	$	(2,083	)	$	(2,552	)

As of June 30, 2019, we expect to reclassify a loss of $3.0 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

Fair Value Measurements

We segregate the inputs used in measuring fair value into three levels: Level 1, defined as observable inputs, such as quoted prices for identical assets or liabilities in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets that are not active; and Level 3, defined as unobservable inputs for which little or no market data exists. We consider counterparty credit risk and our own credit risk in the determination of all estimated fair values.

Recurring Fair Value Measurements. Because we estimate the fair value of our forward-starting interest rate swaps using discounted cash flows, which use observable inputs such as time to maturity and market interest rates, we include interest rate swaps in Level 2 of the fair value hierarchy.

Non-recurring Fair Value Measurements. Please refer to Note 3 for a discussion of the non-recurring fair value measurement associated with the impairment of long-lived assets related to our St. Eustatius terminal.

Fair Value of Financial Instruments

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

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Fair value	$	3,473,806	$	3,056,704
Carrying amount	$	3,401,220	$	3,111,996

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

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

6 Months Ended

Jun. 30, 2019

Temporary Equity Disclosure [Abstract]

SERIES D CUMULATIVE COVERTIBLE PREFERRED UNITS

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

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

In July 2019, our board of directors declared distributions of $0.619 per Series D Preferred Unit to be paid on September 16, 2019.

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.

XML

PARTNERS' EQUITY

6 Months Ended

Jun. 30, 2019

Partners' Capital Notes [Abstract]

PARTNERS' EQUITY

PARTNERS' EQUITY

Series A, B and C Preferred Units

We allocate net income to our 8.50% Series A, 7.625% Series B and 9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively, the Series A, B and C Preferred Units) based on their respective rights to receive distributions earned during the period. Distributions on our Series A, B and C Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month as follows (until the distribution rate changes to a floating rate):

Units	Fixed Distribution Rate Per Unit Per Quarter		Fixed Distribution Per Quarter		Date at Which Distribution Rate Becomes Floating
			(Thousands of Dollars)
Series A Preferred Units	$	0.53125	$	4,813	December 15, 2021
Series B Preferred Units	$	0.47657	$	7,339	June 15, 2022
Series C Preferred Units	$	0.56250	$	3,881	December 15, 2022

In July 2019, our board of directors declared distributions with respect to the Series A, B and C Preferred Units to be paid on September 16, 2019.

Common Limited Partners

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

The following table summarizes information about quarterly cash distributions declared for our common limited partners:

Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
June 30, 2019	$	0.60	$	64,658	August 7, 2019	August 13, 2019
March 31, 2019	$	0.60	$	64,690	May 8, 2019	May 14, 2019

Accumulated Other Comprehensive Income (Loss)

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

	Foreign Currency Translation			Cash Flow Hedges			Pension and Other Postretirement Benefits			Total
	(Thousands of Dollars)
Balance as of January 1, 2019	$	(47,299	)	$	(893	)	$	(6,686	)	$	(54,878	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassification adjustments	2,868			(16,592		)	—			(13,724		)
Net gain on pension costs reclassified into other income, net	—			—			(1,157		)	(1,157		)
Net loss on cash flow hedges reclassified into interest expense, net	—			2,083			—			2,083
Other	—			—			13			13
Other comprehensive income (loss)	2,868			(14,509		)	(1,144		)	(12,785		)
Balance as of June 30, 2019	$	(44,431	)	$	(15,402	)	$	(7,830	)	$	(67,663	)

XML

NET INCOME (LOSS) PER COMMON UNIT

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

NET INCOME (LOSS) PER COMMON UNIT

NET INCOME (LOSS) PER COMMON UNIT

Basic net income (loss) per common unit is determined pursuant to the two-class method. Under this method, all earnings are allocated to our limited partners and participating securities based on their respective rights to receive distributions earned during the period. Participating securities include restricted units awarded under our long-term incentive plans. We compute basic net income (loss) per common unit by dividing net (loss) income attributable to common units by the weighted-average number of common units outstanding during the period.

Diluted net income (loss) per common unit is computed by dividing net income (loss) attributable to common units by the sum of (i) the weighted average number of common units outstanding during the period and (ii) the effect of dilutive potential common units outstanding during the period. Dilutive potential common units may include contingently issuable performance unit awards and the Series D Preferred Units.

The Series D Preferred Units are convertible into common units at the option of the holder at any time on or after June 29, 2028. As such, we calculated the dilutive effect of the Series D Preferred Units using the if-converted method. The effect of the assumed conversion of the Series D Preferred Units outstanding as of the end of each period presented was antidilutive; therefore, we did not include such conversion in the computation of diluted net income (loss) per common unit.

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income (loss)	$	45,951		$	29,399		$	(231,912	)	$	155,532
Distributions to preferred limited partners	(30,423		)	(16,245		)	(60,846		)	(32,235		)
Distributions to general partner	—			—			—			(1,141		)
Distributions to common limited partners	(64,658		)	(64,205		)	(129,348		)	(120,121		)
Distribution equivalent rights to restricted units	(642		)	(480		)	(1,285		)	(925		)
Distributions (in excess of) less than income (loss)	$	(49,772	)	$	(51,531	)	$	(423,391	)	$	1,110
Distributions to common limited partners	$	64,658		$	64,205		$	129,348		$	120,121
Allocation of distributions (in excess of) less than income (loss)	(49,772		)	(50,500		)	(423,391		)	1,079
Series D Preferred Unit accretion	(4,446		)	—			(8,748		)	—
Net income (loss) attributable to common units	$	10,440		$	13,705		$	(302,791	)	$	121,200
Basic weighted-average common units outstanding	107,763,016			93,192,238			107,647,957			93,187,038
Basic net income (loss) per common unit	$	0.10		$	0.15		$	(2.81	)	$	1.30

XML

STATEMENTS OF CASH FLOWS

6 Months Ended

Jun. 30, 2019

Statement of Cash Flows [Abstract]

STATEMENTS OF CASH FLOWS

STATEMENTS OF CASH FLOWS

Changes in current assets and current liabilities were as follows:

	Six Months Ended June 30,
	2019			2018
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	(3,146	)	$	34,518
Receivable from related party	—			130
Inventories	1,551			(1,233		)
Other current assets	(4,075		)	(2,494		)
Increase (decrease) in current liabilities:
Accounts payable	7,704			5,149
Accrued interest payable	2,636			(4,325		)
Accrued liabilities	(34,814		)	10,476
Taxes other than income tax	(3,556		)	1,329
Income tax payable	(2,529		)	(817		)
Changes in current assets and current liabilities	$	(36,229	)	$	42,733

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

• the change in the amount accrued for capital expenditures;

• the effect of foreign currency translation;

• changes in the fair values of our interest rate swap agreements;

• the recognition of lease liabilities upon the adoption of ASC Topic 842; and

• the reclassification of certain assets and liabilities to “Assets held for sale” and “Liabilities held for sale” on the consolidated balance sheets (please refer to Note 3 for additional discussion).

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

	Six Months Ended June 30,
	2019		2018
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	84,677	$	96,761
Cash paid for income taxes, net of tax refunds received	$	6,557	$	7,973

As of June 30, 2019, restricted cash is included in "Prepaid and other current assets" on the consolidated balance sheet. “Cash, cash equivalents and restricted cash” on the consolidated statements of cash flows were included in the consolidated balance sheets as follows:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Cash and cash equivalents	$	15,299	$	11,529
Prepaid and other current assets	8,744		—
Assets held for sale	839		2,115
Cash, cash equivalents and restricted cash	$	24,882	$	13,644

XML

EMPLOYEE BENEFIT PLANS AND UNIT-BASED COMPENSATION

6 Months Ended

Jun. 30, 2019

Compensation Related Costs [Abstract]

Employee Benefit Plans and Unit-Based Compensation [Text Block]

EMPLOYEE BENEFIT PLANS AND UNIT-BASED COMPENSATION

Employee Benefit Plans

NuStar’s Pension Plan is a qualified non-contributory defined benefit pension plan that provides eligible U.S. employees with retirement income as calculated under a cash balance formula. NuStar’s Excess Pension Plan is a nonqualified deferred compensation plan that provides benefits to a select group of management or other highly compensated employees. The Pension Plan and Excess Pension Plan are collectively referred to as the Pension Plans.

Our other postretirement benefit plans include a contributory medical benefits plan for U.S. employees who retired prior to April 1, 2014, and for employees who retire on or after April 1, 2014, a partial reimbursement for eligible third-party health care premiums.

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

	Pension Plans						Other Postretirement Benefit Plans
	2019			2018			2019			2018
	(Thousands of Dollars)
For the three months ended June 30:
Service cost	$	2,387		$	2,405		$	108		$	126
Interest cost	1,370			1,206			113			107
Expected return on assets	(2,003		)	(1,854		)	—			—
Amortization of prior service credit	(514		)	(514		)	(286		)	(286		)
Amortization of net loss	212			543			10			53
Net periodic benefit cost (income)	$	1,452		$	1,786		$	(55	)	$	—
For the six months ended June 30:
Service cost	$	4,775		$	4,811		$	215		$	252
Interest cost	2,740			2,412			227			215
Expected return on assets	(4,007		)	(3,709		)	—			—
Amortization of prior service credit	(1,028		)	(1,028		)	(573		)	(573		)
Amortization of net loss	423			1,087			21			107
Net periodic benefit cost (income)	$	2,903		$	3,573		$	(110	)	$	1

The service cost component of net periodic benefit cost (income) is presented in the same income statement line items as other current employee compensation costs, but the remaining components of net periodic benefit cost (income) are reported on the consolidated statements of comprehensive income in “Other income, net.”

Unit-Based Compensation

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

XML

SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

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

Results of operations for the reportable segments were as follows:

	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019			2018
	(Thousands of Dollars)
Revenues:
Pipeline	$	172,493	$	150,276		$	328,744		$	287,066
Storage:
Third parties	110,403		114,687			213,899			225,966
Intersegment	—		133			4			274
Total storage	110,403		114,820			213,903			226,240
Fuels marketing	89,549		124,293			177,628			252,951
Consolidation and intersegment eliminations	—		(133		)	(4		)	(274		)
Total revenues	$	372,445	$	389,256		$	720,271		$	765,983
Operating income:
Pipeline	$	78,712	$	62,979		$	146,016		$	120,773
Storage	38,098		38,781			70,316			81,868
Fuels marketing	3,160		3,536			5,085			6,332
Consolidation and intersegment eliminations	—		3			(32		)	—
Total segment operating income	119,970		105,299			221,385			208,973
General and administrative expenses	24,868		26,754			50,559			44,896
Other depreciation and amortization expense	1,819		2,158			3,938			4,197
Total operating income	$	93,283	$	76,387		$	166,888		$	159,880

Total assets by reportable segment were as follows:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Pipeline	$	3,824,047	$	3,637,226
Storage	2,028,427		1,902,764
Fuels marketing	39,893		37,252
Total segment assets	5,892,367		5,577,242
Assets held for sale	301,529		599,347
Other partnership assets	185,795		172,551
Total consolidated assets	$	6,379,691	$	6,349,140

XML

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS

6 Months Ended

Jun. 30, 2019

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS

NuStar Energy has no operations, and its assets consist mainly of its investments in 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

June 30, 2019

(Thousands of Dollars)

	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	486	$	332	$	—	$	14,481	$	—		$	15,299
Receivables, net	—		1,692		—		115,996		—			117,688
Inventories	—		1,924		3,169		4,361		—			9,454
Prepaid and other current assets	110		25,619		1,059		2,803		—			29,591
Assets held for sale	—		—		—		301,529		—			301,529
Intercompany receivable	—		1,462,583		—		397,269		(1,859,852		)	—
Total current assets	596		1,492,150		4,228		836,439		(1,859,852		)	473,561
Property, plant and equipment, net	—		2,023,613		609,798		1,387,403		—			4,020,814
Intangible assets, net	—		44,395		—		662,949		—			707,344
Goodwill	—		149,453		170,652		685,748		—			1,005,853
Investment in wholly owned subsidiaries	2,934,489		1,713,256		1,135,618		514,958		(6,298,321		)	—
Other long-term assets, net	57		103,408		32,557		36,097		—			172,119
Total assets	$	2,935,142	$	5,526,275	$	1,952,853	$	4,123,594	$	(8,158,173	)	$	6,379,691
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	$	5,586	$	51,193	$	6,287	$	65,481	$	—		$	128,547
Short-term debt and current portion of finance leases	—		9,940		131		16		—			10,087
Accrued interest payable	—		38,891		—		38		—			38,929
Accrued liabilities	866		28,558		8,942		31,604		—			69,970
Taxes other than income tax	8		6,090		5,955		2,007		—			14,060
Income tax payable	—		217		1		1,702		—			1,920
Liabilities held for sale	—		—		—		68,616		—			68,616
Intercompany payable	459,119		—		1,400,733		—		(1,859,852		)	—
Total current liabilities	465,579		134,889		1,422,049		169,464		(1,859,852		)	332,129
Long-term debt	—		3,393,447		512		62,502		—			3,456,461
Deferred income tax liability	—		1,675		9		10,566		—			12,250
Other long-term liabilities	—		88,772		15,471		72,708		—			176,951
Series D preferred units	572,597		—		—		—		—			572,597
Total partners’ equity	1,896,966		1,907,492		514,812		3,808,354		(6,298,321		)	1,829,303
Total liabilities, mezzanine equity and partners’ equity	$	2,935,142	$	5,526,275	$	1,952,853	$	4,123,594	$	(8,158,173	)	$	6,379,691

Condensed Consolidating Balance Sheets

December 31, 2018

(Thousands of Dollars)

	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	1,255	$	51	$	—	$	10,223	$	—		$	11,529
Receivables, net	—		2,212		—		108,205		—			110,417
Inventories	—		1,741		5,237		1,456		—			8,434
Prepaid and other current assets	61		14,422		908		1,983		—			17,374
Assets held for sale	—		—		—		599,347		—			599,347
Intercompany receivable	—		1,327,833		—		500,583		(1,828,416		)	—
Total current assets	1,316		1,346,259		6,145		1,221,797		(1,828,416		)	747,101
Property, plant and equipment, net	—		1,858,264		615,549		1,300,989		—			3,774,802
Intangible assets, net	—		49,107		—		683,949		—			733,056
Goodwill	—		149,453		170,652		685,748		—			1,005,853
Investment in wholly owned subsidiaries	3,355,636		1,750,256		1,425,283		857,485		(7,388,660		)	—
Other long-term assets, net	304		54,429		26,716		6,879		—			88,328
Total assets	$	3,357,256	$	5,207,768	$	2,244,345	$	4,756,847	$	(9,217,076	)	$	6,349,140
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	$	6,460	$	39,680	$	6,331	$	50,651	$	—		$	103,122
Short-term debt	—		18,500		—		—		—			18,500
Accrued interest payable	—		36,253		—		40		—			36,293
Accrued liabilities	1,280		24,858		8,082		40,198		—			74,418
Taxes other than income tax	125		7,285		4,718		4,695		—			16,823
Income tax payable	—		457		2		3,986		—			4,445
Liabilities held for sale	—		—		—		69,834		—			69,834
Intercompany payable	472,790		—		1,355,626		—		(1,828,416		)	—
Total current liabilities	480,655		127,033		1,374,759		169,404		(1,828,416		)	323,435
Long-term debt	—		3,050,531		—		61,465		—			3,111,996
Deferred income tax liability	—		1,675		9		10,744		—			12,428
Other long-term liabilities	—		28,392		12,348		38,818		—			79,558
Series D preferred units	563,992		—		—		—		—			563,992
Total partners’ equity	2,312,609		2,000,137		857,229		4,476,416		(7,388,660		)	2,257,731
Total liabilities, mezzanine equity and partners’ equity	$	3,357,256	$	5,207,768	$	2,244,345	$	4,756,847	$	(9,217,076	)	$	6,349,140

Condensed Consolidating Statements of Comprehensive Income

For the Three Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	130,136		$	64,452		$	178,042		$	(185	)	$	372,445
Costs and expenses	699			83,029			41,235			154,384			(185		)	279,162
Operating (loss) income	(699		)	47,107			23,217			23,658			—			93,283
Equity in earnings of subsidiaries	47,499			10,990			13,785			35,339			(107,613		)	—
Interest income (expense), net	117			(47,016		)	(1,840		)	3,046			—			(45,693		)
Other income (expense), net	—			743			178			(300		)	—			621
Income from continuing operations before income tax expense (benefit)	46,917			11,824			35,340			61,743			(107,613		)	48,211
Income tax expense (benefit)	2			(469		)	1			1,762			—			1,296
Income from continuing operations, net of tax	46,915			12,293			35,339			59,981			(107,613		)	46,915
(Loss) income from discontinued operations, net of tax (a)	(964		)	7,912			(8,877		)	(17,752		)	18,717			(964		)
Net income	$	45,951		$	20,205		$	26,462		$	42,229		$	(88,896	)	$	45,951
Comprehensive income	$	45,951		$	11,426		$	26,462		$	43,049		$	(88,896	)	$	37,992

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Comprehensive Income (Loss)

For the Three Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	117,862		$	66,505		$	205,036		$	(147	)	$	389,256
Costs and expenses	538			86,588			42,324			183,566			(147		)	312,869
Operating (loss) income	(538		)	31,274			24,181			21,470			—			76,387
Equity in earnings of subsidiaries	27,410			1,692			20,655			43,183			(92,940		)	—
Interest income (expense), net	37			(50,357		)	(1,724		)	3,655			—			(48,389		)
Other income (expense), net	—			1,848			73			(314		)	—			1,607
Income (loss) from continuing operations before income tax expense	26,909			(15,543		)	43,185			67,994			(92,940		)	29,605
Income tax expense	—			61			—			2,635			—			2,696
Income (loss) from continuing operations, net of tax	26,909			(15,604		)	43,185			65,359			(92,940		)	26,909
Income from discontinued operations, net of tax (a)	2,490			—			2,490			4,980			(7,470		)	2,490
Net income (loss)	$	29,399		$	(15,604	)	$	45,675		$	70,339		$	(100,410	)	$	29,399
Comprehensive income (loss)	$	29,399		$	(9,336	)	$	45,675		$	61,450		$	(100,410	)	$	26,778

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Comprehensive (Loss) Income

For the Six Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	247,691		$	122,805		$	350,147		$	(372	)	$	720,271
Costs and expenses	1,375			160,440			77,285			314,655			(372		)	553,383
Operating (loss) income	(1,375		)	87,251			45,520			35,492			—			166,888
Equity in earnings of subsidiaries	76,990			12,329			26,523			68,624			(184,466		)	—
Interest income (expense), net	225			(92,472		)	(3,773		)	6,036			—			(89,984		)
Other income (expense), net	—			1,497			355			(440		)	—			1,412
Income from continuing operations before income tax expense (benefit)	75,840			8,605			68,625			109,712			(184,466		)	78,316
Income tax expense (benefit)	2			(352		)	1			2,827			—			2,478
Income from continuing operations, net of tax	75,838			8,957			68,624			106,885			(184,466		)	75,838
(Loss) income from discontinued operations, net of tax (a)	(307,750		)	7,912			(315,663		)	(631,324		)	939,075			(307,750		)
Net (loss) income	(231,912		)	16,869			(247,039		)	(524,439		)	754,609			(231,912		)
Comprehensive (loss) income	$	(231,912	)	$	2,360		$	(247,039	)	$	(522,715	)	$	754,609		$	(244,697	)

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Comprehensive Income

For the Six Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries		Eliminations			Consolidated
Revenues	$	—		$	237,556		$	122,779		$	405,997	$	(349	)	$	765,983
Costs and expenses	1,150			159,004			77,505			368,793		(349		)	606,103
Operating (loss) income	(1,150		)	78,552			45,274			37,204		—			159,880
Equity in earnings (loss) of subsidiaries	61,223			(557		)	39,758			81,922		(182,346		)	—
Interest income (expense), net	69			(100,383		)	(3,295		)	7,832		—			(95,777		)
Other income, net	—			2,324			188			111		—			2,623
Income (loss) from continuing operations before income tax expense	60,142			(20,064		)	81,925			127,069		(182,346		)	66,726
Income tax expense	—			231			1			6,352		—			6,584
Income (loss) from continuing operations, net of tax	60,142			(20,295		)	81,924			120,717		(182,346		)	60,142
Income from discontinued operations, net of tax (a)	95,390			—			95,390			190,780		(286,170		)	95,390
Net income (loss)	$	155,532		$	(20,295	)	$	177,314		$	311,497	$	(468,516	)	$	155,532
Comprehensive income	$	155,532		$	4,784		$	177,314		$	304,721	$	(468,516	)	$	173,835

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Cash Flows

For the Six Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	187,265		$	77,144		$	60,539		$	200,762		$	(284,816	)	$	240,894
Cash flows from investing activities:
Capital expenditures	—			(167,647		)	(9,131		)	(143,183		)	—			(319,961		)
Change in accounts payable related to capital expenditures	—			11,708			522			3,914			—			16,144
Proceeds from sale or disposition of assets	—			71			26			46			—			143
Investment in subsidiaries	—			(11,999		)	—			—			11,999			—
Net cash used in investing activities	—			(167,867		)	(8,583		)	(139,223		)	11,999			(303,674		)
Cash flows from financing activities:
Debt borrowings	—			570,500			—			23,800			—			594,300
Debt repayments	—			(785,000		)	—			(22,800		)	—			(807,800		)
Note offering, net of issuance costs	—			491,665			—			—			—			491,665
Distributions to preferred unitholders	(60,846		)	(30,424		)	(30,423		)	(30,425		)	91,272			(60,846		)
Distributions to common unitholders	(129,025		)	(64,512		)	(64,512		)	(64,520		)	193,544			(129,025		)
Contributions from affiliates	—			—			—			11,999			(11,999		)	—
Net intercompany activity	9,641			(75,900		)	43,009			23,250			—			—
Payment of tax withholding for unit-based compensation	(6,368		)	—			—			—			—			(6,368		)
Other, net	(1,436		)	(6,581		)	(30		)	(122		)	—			(8,169		)
Net cash (used in) provided by financing activities	(188,034		)	99,748			(51,956		)	(58,818		)	272,817			73,757
Effect of foreign exchange rate changes on cash	—			—			—			261			—			261
Net (decrease) increase in cash, cash equivalents and restricted cash	(769		)	9,025			—			2,982			—			11,238
Cash, cash equivalents, and restricted cash as of the beginning of the period	1,255			51			—			12,338			—			13,644
Cash, cash equivalents and restricted cash as of the end of the period	$	486		$	9,076		$	—		$	15,320		$	—		$	24,882

Condensed Consolidating Statements of Cash Flows

For the Six Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	200,803		$	31,209		$	58,105		$	261,300		$	(307,567	)	$	243,850
Cash flows from investing activities:
Capital expenditures	—			(17,136		)	(8,164		)	(223,221		)	—			(248,521		)
Change in accounts payable related to capital expenditures	—			495			(5,173		)	(14,642		)	—			(19,320		)
Proceeds from sale or disposition of assets	—			1,385			16			696			—			2,097
Proceeds from insurance recoveries	—			—			—			78,419			—			78,419
Acquisitions	—			—			(37,502		)	—			—			(37,502		)
Net cash used in investing activities	—			(15,256		)	(50,823		)	(158,748		)	—			(224,827		)
Cash flows from financing activities:
Debt borrowings	—			1,122,272			—			11,000			—			1,133,272
Debt repayments	—			(1,316,621		)	—			(16,900		)	—			(1,333,521		)
Issuance of Series D preferred units	400,000			—			—			—			—			400,000
Payment of issuance costs for Series D preferred units	(29,289		)	—			—			—			—			(29,289		)
Issuance of common units	10,000			—			—			—			—			10,000
Distributions to preferred unitholders	(32,713		)	(16,356		)	(16,357		)	(16,358		)	49,071			(32,713		)
Distributions to common unitholders and general partner	(172,324		)	(86,162		)	(86,162		)	(86,172		)	258,496			(172,324		)
Proceeds from termination of interest rate swaps	—			8,048			—			—			—			8,048
Net intercompany activity	(374,973		)	279,080			95,237			656			—			—
Other, net	(1,493		)	(4,466		)	—			(64		)	—			(6,023		)
Net cash used in financing activities	(200,792		)	(14,205		)	(7,282		)	(107,838		)	307,567			(22,550		)
Effect of foreign exchange rate changes on cash	—			—			—			(421		)	—			(421		)
Net increase (decrease) in cash and cash equivalents	11			1,748			—			(5,707		)	—			(3,948		)
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	$	896		$	1,777		$	—		$	17,671		$	—		$	20,344

XML

ORGANIZATION AND BASIS OF PRESENTATION (Policies)

6 Months Ended

Jun. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Restricted Cash [Policy Text Block]

As of June 30, 2019, we have restricted cash representing legally restricted funds that are unavailable for general use totaling $8.7 million, which is included in “Prepaid and other current assets” on the consolidated balance sheet.

XML

LEASE ASSETS AND LIABILITIES Leases (Policies)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Leases [Policy Text Block]

We elected the following practical expedients permitted under the transition guidance within the new standard:

• the package of practical expedients, which, among other things, allowed us to carry forward historical lease classification;

• the practical expedient specifically related to land easements, which, among other things, allowed us to carry forward our historical accounting treatment for existing land easement agreements;

• the lessee practical expedient to combine lease and non-lease components for all of our asset classes except the other pipeline and terminal equipment asset class; and

• the lessor practical expedient to combine lease and non-lease components and to account for the transaction based on the predominant component (i.e., ASC Topic 842 or ASC Topic 606, “Revenue from Contracts with Customers”). We apply this expedient to certain contracts in which we agree to provide both storage capacity and optional services to customers.

We record all leases on our consolidated balance sheet except for those leases with an initial term of 12 months or less, which are expensed on a straight-line basis over the lease term. We use judgment in determining the reasonably certain lease term and consider factors such as the nature and utility of the leased asset, as well as the importance of the leased asset to our operations. We calculate the present value of our lease liabilities based upon our incremental borrowing rate unless the rate implicit in the lease is readily determinable.

XML

DISCONTINUED OPERATIONS AND IMPAIRMENTS (Tables)

6 Months Ended

Jun. 30, 2019

Discontinued Operations and Disposal Groups [Abstract]

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

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars)
Revenues	$	92,837		$	96,948		$	231,480		$	196,102
Costs and expenses:
Cost of revenues	86,278			92,177			202,880			174,633
Impairment losses	8,398			—			336,838			—
General and administrative expenses (excluding depreciation and amortization expense)	305			1,227			610			2,859
Other depreciation and amortization expense	—			93			—			172
Total costs and expenses	94,981			93,497			540,328			177,664
Operating (loss) income	(2,144		)	3,451			(308,848		)	18,438
Interest income (expense), net	9			(547		)	32			(931		)
Other income (expense), net	1,171			(195		)	1,167			78,541
(Loss) income from discontinued operations before income tax expense	(964		)	2,709			(307,649		)	96,048
Income tax expense	—			219			101			658
(Loss) income from discontinued operations, net of tax	$	(964	)	$	2,490		$	(307,750	)	$	95,390

Discontinued Operations, Selected Cash Flow Information

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

	Six Months Ended June 30,
	2019			2018
	(Thousands of Dollars)
Capital expenditures	$	(23,635	)	$	(82,111	)
Significant noncash operating activities:
Depreciation and amortization expense	$	8,536		$	22,081
Asset impairment losses	$	305,715		$	—
Goodwill impairment loss	$	31,123		$	—
Gain from insurance recoveries	$	—		$	(78,756	)

Disposal Groups, Including Discontinued Operations [Table Text Block]

The following is a reconciliation of the carrying amounts of the major classes of assets and liabilities included in “Assets held for sale” and “Liabilities held for sale” on the consolidated balance sheets:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Total current assets	$	46,826	$	54,404
Property, plant and equipment, net	223,723		513,820
Goodwill	—		31,123
Other long-term assets, net	30,980		—
Assets held for sale	$	301,529	$	599,347
Total current liabilities	$	44,625	$	69,834
Total long-term liabilities	23,991		—
Liabilities held for sale	$	68,616	$	69,834

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

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

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

	2019						2018
	Contract Assets			Contract Liabilities			Contract Assets			Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,066		$	(21,579	)	$	1,956		$	(13,801	)
Noncurrent portion	539			(38,945		)	171			(46,361		)
Held for sale	—			(25,357		)	—			(302		)
Total	2,605			(85,881		)	2,127			(60,464		)
Activity:
Additions	2,674			(24,537		)	879			(20,820		)
Transfer to accounts receivable	(2,638		)	—			(2,397		)	—
Transfer to revenues, including amounts reported in discontinued operations	—			46,757			—			28,466
Total	36			22,220			(1,518		)	7,646
Balances as of June 30:
Current portion	1,483			(23,688		)	327			(17,881		)
Noncurrent portion	1,158			(39,973		)	282			(34,669		)
Held for sale	—			—			—			(268		)
Total	$	2,641		$	(63,661	)	$	609		$	(52,818	)

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 June 30, 2019 (in thousands of dollars):

2019 (remaining)	$	252,055
2020	422,044
2021	290,290
2022	241,784
2023	172,720
Thereafter	332,782
Total	$	1,711,675

Disaggregation of Revenue [Table Text Block]

The following table disaggregates our revenues:

	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019			2018
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	77,293	$	60,507		$	145,771		$	113,944
Refined products and ammonia pipelines	92,534		89,769			177,640			173,068
Total pipeline segment revenues from contracts with customers	169,827		150,276			323,411			287,012
Lessor revenues	2,666		—			5,333			54
Total pipeline segment revenues	172,493		150,276			328,744			287,066
Storage segment:
Throughput terminals	23,170		20,140			44,856			40,157
Storage terminals	77,039		84,718			148,660			166,159
Total storage segment revenues from contracts with customers	100,209		104,858			193,516			206,316
Lessor revenues	10,194		9,962			20,387			19,924
Total storage segment revenues	110,403		114,820			213,903			226,240
Fuels marketing segment:
Revenues from contracts with customers	89,549		124,293			177,628			252,951
Consolidation and intersegment eliminations	—		(133		)	(4		)	(274		)
Total revenues	$	372,445	$	389,256		$	720,271		$	765,983

XML

LEASE ASSETS AND LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Schedule of Right-of-Use Assets and Lease Liabilities

As of June 30, 2019, right-of-use assets and lease liabilities included in our consolidated balance sheet were as follows:

	Balance Sheet Location	June 30, 2019
		(Thousands of Dollars)
Right-of-Use Assets:
Operating	Other long-term assets, net	$	86,414
Operating	Assets held for sale	$	30,980
Finance	Property, plant and equipment, net of accumulated amortization of $1,741	$	73,982
Lease Liabilities:
Operating:
Current	Accrued liabilities	$	11,832
Current	Liabilities held for sale	31,681
Noncurrent	Other long-term liabilities	73,723
Total operating lease liabilities		$	117,236
Finance:
Current	Short-term debt and current portion of finance leases	$	4,087
Noncurrent	Long-term debt	55,241
Total finance lease liabilities		$	59,328

Maturity Analysis of Lease Liabilities

As of June 30, 2019, maturities of our operating and finance lease liabilities were as follows:

	Operating Leases		Finance Leases
	(Thousands of Dollars)
2019 (remaining)	$	13,042	$	3,022
2020	17,053		6,044
2021	13,180		4,594
2022	12,622		3,939
2023	11,654		3,896
Thereafter	79,789		63,281
Total lease payments	$	147,340	$	84,776
Less: Interest	30,104		25,448
Present value of lease liabilities	$	117,236	$	59,328

Lease Cost

Costs incurred for leases were as follows:

	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
	(Thousands of Dollars)
Operating lease cost	$	9,477	$	18,941
Finance lease cost:
Amortization of right-of-use assets	900		1,741
Interest expense on lease liability	550		1,099
Short-term lease cost	5,609		9,923
Variable lease cost	977		1,788
Total lease cost	$	17,513	$	33,492

Additional Lease Information

The table below presents additional information regarding our leases:

	Operating Leases			Finance Leases
	(Thousands of Dollars, Except Term and Rate Data)
For the six months ended June 30, 2019:
Cash outflows from operating activities	$	18,710		$	916
Cash outflows from financing activities				$	1,569
Right-of-use assets obtained in exchange for lease liabilities	$	1,352		$	1,452
As of June 30, 2019:
Weighted-average remaining lease term (in years)	13			22
Weighted-average discount rate	3.6		%	3.7		%

XML

DERIVATIVES AND FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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

The fair values of our interest rate swaps included in our consolidated balance sheets were as follows:

	Asset Derivatives				Liability Derivatives
Balance Sheet Location	June 30, 2019		December 31, 2018		June 30, 2019			December 31, 2018
	(Thousands of Dollars)
Other long-term assets, net	$	—	$	627	$	—		$	—
Other long-term liabilities	$	—	$	—	$	(16,716	)	$	(751	)

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

Our interest rate swaps had the following impact on earnings:

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars)
(Loss) gain recognized in other comprehensive income (loss) on derivative	$	(9,784	)	$	5,106		$	(16,592	)	$	22,527
Loss reclassified from AOCI into interest expense, net	$	(1,005	)	$	(1,162	)	$	(2,083	)	$	(2,552	)

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

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

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Fair value	$	3,473,806	$	3,056,704
Carrying amount	$	3,401,220	$	3,111,996

XML

PARTNERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2019

Partners' Capital Notes [Abstract]

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

The following table summarizes information about quarterly cash distributions declared for our common limited partners:

Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)
June 30, 2019	$	0.60	$	64,658	August 7, 2019	August 13, 2019
March 31, 2019	$	0.60	$	64,690	May 8, 2019	May 14, 2019

Distributions on our Series A, B and C Preferred Units are payable out of any legally available funds, accrue and are cumulative from the original issuance dates, and are payable on the 15th day (or next business day) of each of March, June, September and December of each year to holders of record on the first business day of each payment month as follows (until the distribution rate changes to a floating rate):

Units	Fixed Distribution Rate Per Unit Per Quarter		Fixed Distribution Per Quarter		Date at Which Distribution Rate Becomes Floating
			(Thousands of Dollars)
Series A Preferred Units	$	0.53125	$	4,813	December 15, 2021
Series B Preferred Units	$	0.47657	$	7,339	June 15, 2022
Series C Preferred Units	$	0.56250	$	3,881	December 15, 2022

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

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

	Foreign Currency Translation			Cash Flow Hedges			Pension and Other Postretirement Benefits			Total
	(Thousands of Dollars)
Balance as of January 1, 2019	$	(47,299	)	$	(893	)	$	(6,686	)	$	(54,878	)
Other comprehensive income (loss):
Other comprehensive income (loss) before reclassification adjustments	2,868			(16,592		)	—			(13,724		)
Net gain on pension costs reclassified into other income, net	—			—			(1,157		)	(1,157		)
Net loss on cash flow hedges reclassified into interest expense, net	—			2,083			—			2,083
Other	—			—			13			13
Other comprehensive income (loss)	2,868			(14,509		)	(1,144		)	(12,785		)
Balance as of June 30, 2019	$	(44,431	)	$	(15,402	)	$	(7,830	)	$	(67,663	)

XML

NET INCOME (LOSS) PER COMMON UNIT (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Net Income (Loss) Per Common Unit

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income (loss)	$	45,951		$	29,399		$	(231,912	)	$	155,532
Distributions to preferred limited partners	(30,423		)	(16,245		)	(60,846		)	(32,235		)
Distributions to general partner	—			—			—			(1,141		)
Distributions to common limited partners	(64,658		)	(64,205		)	(129,348		)	(120,121		)
Distribution equivalent rights to restricted units	(642		)	(480		)	(1,285		)	(925		)
Distributions (in excess of) less than income (loss)	$	(49,772	)	$	(51,531	)	$	(423,391	)	$	1,110
Distributions to common limited partners	$	64,658		$	64,205		$	129,348		$	120,121
Allocation of distributions (in excess of) less than income (loss)	(49,772		)	(50,500		)	(423,391		)	1,079
Series D Preferred Unit accretion	(4,446		)	—			(8,748		)	—
Net income (loss) attributable to common units	$	10,440		$	13,705		$	(302,791	)	$	121,200
Basic weighted-average common units outstanding	107,763,016			93,192,238			107,647,957			93,187,038
Basic net income (loss) per common unit	$	0.10		$	0.15		$	(2.81	)	$	1.30

XML

STATEMENTS OF CASH FLOWS (Tables)

6 Months Ended

Jun. 30, 2019

Statement of Cash Flows [Abstract]

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

Changes in current assets and current liabilities were as follows:

	Six Months Ended June 30,
	2019			2018
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	(3,146	)	$	34,518
Receivable from related party	—			130
Inventories	1,551			(1,233		)
Other current assets	(4,075		)	(2,494		)
Increase (decrease) in current liabilities:
Accounts payable	7,704			5,149
Accrued interest payable	2,636			(4,325		)
Accrued liabilities	(34,814		)	10,476
Taxes other than income tax	(3,556		)	1,329
Income tax payable	(2,529		)	(817		)
Changes in current assets and current liabilities	$	(36,229	)	$	42,733

Schedule of Supplemental Cash Flow Information [Table Text Block]

“Cash, cash equivalents and restricted cash” on the consolidated statements of cash flows were included in the consolidated balance sheets as follows:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Cash and cash equivalents	$	15,299	$	11,529
Prepaid and other current assets	8,744		—
Assets held for sale	839		2,115
Cash, cash equivalents and restricted cash	$	24,882	$	13,644

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

	Six Months Ended June 30,
	2019		2018
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	84,677	$	96,761
Cash paid for income taxes, net of tax refunds received	$	6,557	$	7,973

XML

EMPLOYEE BENEFIT PLANS AND UNIT-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2019

Compensation Related Costs [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

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

	Pension Plans						Other Postretirement Benefit Plans
	2019			2018			2019			2018
	(Thousands of Dollars)
For the three months ended June 30:
Service cost	$	2,387		$	2,405		$	108		$	126
Interest cost	1,370			1,206			113			107
Expected return on assets	(2,003		)	(1,854		)	—			—
Amortization of prior service credit	(514		)	(514		)	(286		)	(286		)
Amortization of net loss	212			543			10			53
Net periodic benefit cost (income)	$	1,452		$	1,786		$	(55	)	$	—
For the six months ended June 30:
Service cost	$	4,775		$	4,811		$	215		$	252
Interest cost	2,740			2,412			227			215
Expected return on assets	(4,007		)	(3,709		)	—			—
Amortization of prior service credit	(1,028		)	(1,028		)	(573		)	(573		)
Amortization of net loss	423			1,087			21			107
Net periodic benefit cost (income)	$	2,903		$	3,573		$	(110	)	$	1

XML

SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

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

Results of operations for the reportable segments were as follows:

	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019			2018
	(Thousands of Dollars)
Revenues:
Pipeline	$	172,493	$	150,276		$	328,744		$	287,066
Storage:
Third parties	110,403		114,687			213,899			225,966
Intersegment	—		133			4			274
Total storage	110,403		114,820			213,903			226,240
Fuels marketing	89,549		124,293			177,628			252,951
Consolidation and intersegment eliminations	—		(133		)	(4		)	(274		)
Total revenues	$	372,445	$	389,256		$	720,271		$	765,983
Operating income:
Pipeline	$	78,712	$	62,979		$	146,016		$	120,773
Storage	38,098		38,781			70,316			81,868
Fuels marketing	3,160		3,536			5,085			6,332
Consolidation and intersegment eliminations	—		3			(32		)	—
Total segment operating income	119,970		105,299			221,385			208,973
General and administrative expenses	24,868		26,754			50,559			44,896
Other depreciation and amortization expense	1,819		2,158			3,938			4,197
Total operating income	$	93,283	$	76,387		$	166,888		$	159,880

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

Total assets by reportable segment were as follows:

	June 30, 2019		December 31, 2018
	(Thousands of Dollars)
Pipeline	$	3,824,047	$	3,637,226
Storage	2,028,427		1,902,764
Fuels marketing	39,893		37,252
Total segment assets	5,892,367		5,577,242
Assets held for sale	301,529		599,347
Other partnership assets	185,795		172,551
Total consolidated assets	$	6,379,691	$	6,349,140

XML

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Tables)

6 Months Ended

Jun. 30, 2019

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS [Abstract]

Condensed Consolidating Balance Sheets [Text Block]

Condensed Consolidating Balance Sheets

June 30, 2019

(Thousands of Dollars)

	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	486	$	332	$	—	$	14,481	$	—		$	15,299
Receivables, net	—		1,692		—		115,996		—			117,688
Inventories	—		1,924		3,169		4,361		—			9,454
Prepaid and other current assets	110		25,619		1,059		2,803		—			29,591
Assets held for sale	—		—		—		301,529		—			301,529
Intercompany receivable	—		1,462,583		—		397,269		(1,859,852		)	—
Total current assets	596		1,492,150		4,228		836,439		(1,859,852		)	473,561
Property, plant and equipment, net	—		2,023,613		609,798		1,387,403		—			4,020,814
Intangible assets, net	—		44,395		—		662,949		—			707,344
Goodwill	—		149,453		170,652		685,748		—			1,005,853
Investment in wholly owned subsidiaries	2,934,489		1,713,256		1,135,618		514,958		(6,298,321		)	—
Other long-term assets, net	57		103,408		32,557		36,097		—			172,119
Total assets	$	2,935,142	$	5,526,275	$	1,952,853	$	4,123,594	$	(8,158,173	)	$	6,379,691
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	$	5,586	$	51,193	$	6,287	$	65,481	$	—		$	128,547
Short-term debt and current portion of finance leases	—		9,940		131		16		—			10,087
Accrued interest payable	—		38,891		—		38		—			38,929
Accrued liabilities	866		28,558		8,942		31,604		—			69,970
Taxes other than income tax	8		6,090		5,955		2,007		—			14,060
Income tax payable	—		217		1		1,702		—			1,920
Liabilities held for sale	—		—		—		68,616		—			68,616
Intercompany payable	459,119		—		1,400,733		—		(1,859,852		)	—
Total current liabilities	465,579		134,889		1,422,049		169,464		(1,859,852		)	332,129
Long-term debt	—		3,393,447		512		62,502		—			3,456,461
Deferred income tax liability	—		1,675		9		10,566		—			12,250
Other long-term liabilities	—		88,772		15,471		72,708		—			176,951
Series D preferred units	572,597		—		—		—		—			572,597
Total partners’ equity	1,896,966		1,907,492		514,812		3,808,354		(6,298,321		)	1,829,303
Total liabilities, mezzanine equity and partners’ equity	$	2,935,142	$	5,526,275	$	1,952,853	$	4,123,594	$	(8,158,173	)	$	6,379,691

Condensed Consolidating Balance Sheets

December 31, 2018

(Thousands of Dollars)

	NuStar Energy		NuStar Logistics		NuPOP		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Assets
Cash and cash equivalents	$	1,255	$	51	$	—	$	10,223	$	—		$	11,529
Receivables, net	—		2,212		—		108,205		—			110,417
Inventories	—		1,741		5,237		1,456		—			8,434
Prepaid and other current assets	61		14,422		908		1,983		—			17,374
Assets held for sale	—		—		—		599,347		—			599,347
Intercompany receivable	—		1,327,833		—		500,583		(1,828,416		)	—
Total current assets	1,316		1,346,259		6,145		1,221,797		(1,828,416		)	747,101
Property, plant and equipment, net	—		1,858,264		615,549		1,300,989		—			3,774,802
Intangible assets, net	—		49,107		—		683,949		—			733,056
Goodwill	—		149,453		170,652		685,748		—			1,005,853
Investment in wholly owned subsidiaries	3,355,636		1,750,256		1,425,283		857,485		(7,388,660		)	—
Other long-term assets, net	304		54,429		26,716		6,879		—			88,328
Total assets	$	3,357,256	$	5,207,768	$	2,244,345	$	4,756,847	$	(9,217,076	)	$	6,349,140
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	$	6,460	$	39,680	$	6,331	$	50,651	$	—		$	103,122
Short-term debt	—		18,500		—		—		—			18,500
Accrued interest payable	—		36,253		—		40		—			36,293
Accrued liabilities	1,280		24,858		8,082		40,198		—			74,418
Taxes other than income tax	125		7,285		4,718		4,695		—			16,823
Income tax payable	—		457		2		3,986		—			4,445
Liabilities held for sale	—		—		—		69,834		—			69,834
Intercompany payable	472,790		—		1,355,626		—		(1,828,416		)	—
Total current liabilities	480,655		127,033		1,374,759		169,404		(1,828,416		)	323,435
Long-term debt	—		3,050,531		—		61,465		—			3,111,996
Deferred income tax liability	—		1,675		9		10,744		—			12,428
Other long-term liabilities	—		28,392		12,348		38,818		—			79,558
Series D preferred units	563,992		—		—		—		—			563,992
Total partners’ equity	2,312,609		2,000,137		857,229		4,476,416		(7,388,660		)	2,257,731
Total liabilities, mezzanine equity and partners’ equity	$	3,357,256	$	5,207,768	$	2,244,345	$	4,756,847	$	(9,217,076	)	$	6,349,140

Condensed Consolidating Statements of Comprehensive Income (Loss) [Table Text Block]

Condensed Consolidating Statements of Comprehensive Income

For the Three Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	130,136		$	64,452		$	178,042		$	(185	)	$	372,445
Costs and expenses	699			83,029			41,235			154,384			(185		)	279,162
Operating (loss) income	(699		)	47,107			23,217			23,658			—			93,283
Equity in earnings of subsidiaries	47,499			10,990			13,785			35,339			(107,613		)	—
Interest income (expense), net	117			(47,016		)	(1,840		)	3,046			—			(45,693		)
Other income (expense), net	—			743			178			(300		)	—			621
Income from continuing operations before income tax expense (benefit)	46,917			11,824			35,340			61,743			(107,613		)	48,211
Income tax expense (benefit)	2			(469		)	1			1,762			—			1,296
Income from continuing operations, net of tax	46,915			12,293			35,339			59,981			(107,613		)	46,915
(Loss) income from discontinued operations, net of tax (a)	(964		)	7,912			(8,877		)	(17,752		)	18,717			(964		)
Net income	$	45,951		$	20,205		$	26,462		$	42,229		$	(88,896	)	$	45,951
Comprehensive income	$	45,951		$	11,426		$	26,462		$	43,049		$	(88,896	)	$	37,992

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Comprehensive Income (Loss)

For the Three Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	117,862		$	66,505		$	205,036		$	(147	)	$	389,256
Costs and expenses	538			86,588			42,324			183,566			(147		)	312,869
Operating (loss) income	(538		)	31,274			24,181			21,470			—			76,387
Equity in earnings of subsidiaries	27,410			1,692			20,655			43,183			(92,940		)	—
Interest income (expense), net	37			(50,357		)	(1,724		)	3,655			—			(48,389		)
Other income (expense), net	—			1,848			73			(314		)	—			1,607
Income (loss) from continuing operations before income tax expense	26,909			(15,543		)	43,185			67,994			(92,940		)	29,605
Income tax expense	—			61			—			2,635			—			2,696
Income (loss) from continuing operations, net of tax	26,909			(15,604		)	43,185			65,359			(92,940		)	26,909
Income from discontinued operations, net of tax (a)	2,490			—			2,490			4,980			(7,470		)	2,490
Net income (loss)	$	29,399		$	(15,604	)	$	45,675		$	70,339		$	(100,410	)	$	29,399
Comprehensive income (loss)	$	29,399		$	(9,336	)	$	45,675		$	61,450		$	(100,410	)	$	26,778

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Comprehensive (Loss) Income

For the Six Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues	$	—		$	247,691		$	122,805		$	350,147		$	(372	)	$	720,271
Costs and expenses	1,375			160,440			77,285			314,655			(372		)	553,383
Operating (loss) income	(1,375		)	87,251			45,520			35,492			—			166,888
Equity in earnings of subsidiaries	76,990			12,329			26,523			68,624			(184,466		)	—
Interest income (expense), net	225			(92,472		)	(3,773		)	6,036			—			(89,984		)
Other income (expense), net	—			1,497			355			(440		)	—			1,412
Income from continuing operations before income tax expense (benefit)	75,840			8,605			68,625			109,712			(184,466		)	78,316
Income tax expense (benefit)	2			(352		)	1			2,827			—			2,478
Income from continuing operations, net of tax	75,838			8,957			68,624			106,885			(184,466		)	75,838
(Loss) income from discontinued operations, net of tax (a)	(307,750		)	7,912			(315,663		)	(631,324		)	939,075			(307,750		)
Net (loss) income	(231,912		)	16,869			(247,039		)	(524,439		)	754,609			(231,912		)
Comprehensive (loss) income	$	(231,912	)	$	2,360		$	(247,039	)	$	(522,715	)	$	754,609		$	(244,697	)

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Comprehensive Income

For the Six Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries		Eliminations			Consolidated
Revenues	$	—		$	237,556		$	122,779		$	405,997	$	(349	)	$	765,983
Costs and expenses	1,150			159,004			77,505			368,793		(349		)	606,103
Operating (loss) income	(1,150		)	78,552			45,274			37,204		—			159,880
Equity in earnings (loss) of subsidiaries	61,223			(557		)	39,758			81,922		(182,346		)	—
Interest income (expense), net	69			(100,383		)	(3,295		)	7,832		—			(95,777		)
Other income, net	—			2,324			188			111		—			2,623
Income (loss) from continuing operations before income tax expense	60,142			(20,064		)	81,925			127,069		(182,346		)	66,726
Income tax expense	—			231			1			6,352		—			6,584
Income (loss) from continuing operations, net of tax	60,142			(20,295		)	81,924			120,717		(182,346		)	60,142
Income from discontinued operations, net of tax (a)	95,390			—			95,390			190,780		(286,170		)	95,390
Net income (loss)	$	155,532		$	(20,295	)	$	177,314		$	311,497	$	(468,516	)	$	155,532
Comprehensive income	$	155,532		$	4,784		$	177,314		$	304,721	$	(468,516	)	$	173,835

(a) Includes equity in earnings (loss) of subsidiaries related to discontinued operations.

Condensed Consolidating Statements of Cash Flows [Text Block]

Condensed Consolidating Statements of Cash Flows

For the Six Months Ended June 30, 2019

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	187,265		$	77,144		$	60,539		$	200,762		$	(284,816	)	$	240,894
Cash flows from investing activities:
Capital expenditures	—			(167,647		)	(9,131		)	(143,183		)	—			(319,961		)
Change in accounts payable related to capital expenditures	—			11,708			522			3,914			—			16,144
Proceeds from sale or disposition of assets	—			71			26			46			—			143
Investment in subsidiaries	—			(11,999		)	—			—			11,999			—
Net cash used in investing activities	—			(167,867		)	(8,583		)	(139,223		)	11,999			(303,674		)
Cash flows from financing activities:
Debt borrowings	—			570,500			—			23,800			—			594,300
Debt repayments	—			(785,000		)	—			(22,800		)	—			(807,800		)
Note offering, net of issuance costs	—			491,665			—			—			—			491,665
Distributions to preferred unitholders	(60,846		)	(30,424		)	(30,423		)	(30,425		)	91,272			(60,846		)
Distributions to common unitholders	(129,025		)	(64,512		)	(64,512		)	(64,520		)	193,544			(129,025		)
Contributions from affiliates	—			—			—			11,999			(11,999		)	—
Net intercompany activity	9,641			(75,900		)	43,009			23,250			—			—
Payment of tax withholding for unit-based compensation	(6,368		)	—			—			—			—			(6,368		)
Other, net	(1,436		)	(6,581		)	(30		)	(122		)	—			(8,169		)
Net cash (used in) provided by financing activities	(188,034		)	99,748			(51,956		)	(58,818		)	272,817			73,757
Effect of foreign exchange rate changes on cash	—			—			—			261			—			261
Net (decrease) increase in cash, cash equivalents and restricted cash	(769		)	9,025			—			2,982			—			11,238
Cash, cash equivalents, and restricted cash as of the beginning of the period	1,255			51			—			12,338			—			13,644
Cash, cash equivalents and restricted cash as of the end of the period	$	486		$	9,076		$	—		$	15,320		$	—		$	24,882

Condensed Consolidating Statements of Cash Flows

For the Six Months Ended June 30, 2018

(Thousands of Dollars)

	NuStar Energy			NuStar Logistics			NuPOP			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net cash provided by operating activities	$	200,803		$	31,209		$	58,105		$	261,300		$	(307,567	)	$	243,850
Cash flows from investing activities:
Capital expenditures	—			(17,136		)	(8,164		)	(223,221		)	—			(248,521		)
Change in accounts payable related to capital expenditures	—			495			(5,173		)	(14,642		)	—			(19,320		)
Proceeds from sale or disposition of assets	—			1,385			16			696			—			2,097
Proceeds from insurance recoveries	—			—			—			78,419			—			78,419
Acquisitions	—			—			(37,502		)	—			—			(37,502		)
Net cash used in investing activities	—			(15,256		)	(50,823		)	(158,748		)	—			(224,827		)
Cash flows from financing activities:
Debt borrowings	—			1,122,272			—			11,000			—			1,133,272
Debt repayments	—			(1,316,621		)	—			(16,900		)	—			(1,333,521		)
Issuance of Series D preferred units	400,000			—			—			—			—			400,000
Payment of issuance costs for Series D preferred units	(29,289		)	—			—			—			—			(29,289		)
Issuance of common units	10,000			—			—			—			—			10,000
Distributions to preferred unitholders	(32,713		)	(16,356		)	(16,357		)	(16,358		)	49,071			(32,713		)
Distributions to common unitholders and general partner	(172,324		)	(86,162		)	(86,162		)	(86,172		)	258,496			(172,324		)
Proceeds from termination of interest rate swaps	—			8,048			—			—			—			8,048
Net intercompany activity	(374,973		)	279,080			95,237			656			—			—
Other, net	(1,493		)	(4,466		)	—			(64		)	—			(6,023		)
Net cash used in financing activities	(200,792		)	(14,205		)	(7,282		)	(107,838		)	307,567			(22,550		)
Effect of foreign exchange rate changes on cash	—			—			—			(421		)	—			(421		)
Net increase (decrease) in cash and cash equivalents	11			1,748			—			(5,707		)	—			(3,948		)
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	$	896		$	1,777		$	—		$	17,671		$	—		$	20,344

XML

ORGANIZATION AND BASIS OF PRESENTATION Narrative 1 (Details) shares in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2018 shares	Jun. 30, 2019	Jul. 20, 2018 Rate
Class of Stock [Line Items]
Common unit conversion rate | Rate			55.00%
Number of business segments		3
Common Limited Partner [Member]
Class of Stock [Line Items]
Issuance of NuStar Energy common units as a result of the Merger, incremental units issued | shares	13.4

XML

ORGANIZATION AND BASIS OF PRESENTATION Narrative 2 (Details) $ in Millions	May 09, 2019 USD ($)
The St. Eustatius Disposition [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture of business, sales price, St. Eustatius terminal and bunkering operations	$ 250.0

XML

ORGANIZATION AND BASIS OF PRESENTATION Narrative 3 (Details) $ in Millions	Jun. 30, 2019 USD ($)
Prepaid and other current assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 8.7

XML

NEW ACCOUNTING PRONOUNCEMENTS Narrative (Details)	6 Months Ended
	Jun. 30, 2019
Leases [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Transition adjustment	The transition adjustment related to the adoption was immaterial

XML

DISCONTINUED OPERATIONS AND IMPAIRMENTS Narrative 1 (Details) - The St. Eustatius Disposition [Member] - USD ($) $ in Millions	Jul. 29, 2019	May 09, 2019
Subsequent Event [Line Items]
Divestiture of business, sales price, St. Eustatius terminal and bunkering operations		$ 250.0
Subsequent Event [Member]
Subsequent Event [Line Items]
Net sales proceeds	$ 234.0
Description of assets sold	The St. Eustatius Disposition included a 14.3 million barrel storage and terminalling facility and related assets on the island of St. Eustatius in the Caribbean Netherlands.

XML

DISCONTINUED OPERATIONS AND IMPAIRMENTS Narrative 2 (Details) - The European Disposition [Member] $ in Millions	Nov. 30, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Description of assets sold	European operations, which consisted of six liquids storage terminals in the United Kingdom and one facility in Amsterdam and related assets
Net sales proceeds	$ 270.0

XML

DISCONTINUED OPERATIONS AND IMPAIRMENTS Table 1 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income tax expense	$ (964)	$ 2,709	$ (307,649)	$ 96,048
Income tax expense	0	219	101	658
(Loss) income from discontinued operations, net of tax	(964)	2,490	(307,750)	95,390
Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	92,837	96,948	231,480	196,102
Cost of revenues	86,278	92,177	202,880	174,633
Impairment losses	8,398	0	336,838	0
General and administrative expenses (excluding depreciation and amortization expense)	305	1,227	610	2,859
Other depreciation and amortization expense	0	93	0	172
Total costs and expenses	94,981	93,497	540,328	177,664
Operating income (loss)	(2,144)	3,451	(308,848)	18,438
Interest expense, net		(547)		(931)
Disposal Group, Including Discontinued Operation, Interest Income	9		32
Other income (expense), net	$ 1,171		$ 1,167	$ 78,541
Disposal Group, Including Discontinued Operation, Other Expense		$ (195)

XML

DISCONTINUED OPERATIONS AND IMPAIRMENTS Table 2 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment losses	$ 8,400	$ 297,300	$ 305,715	$ 0
Goodwill impairment loss			31,123	0
Gain from insurance recoveries			0	(78,756)
Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures			(23,635)	(82,111)
Depreciation and amortization expense			8,536	22,081
Asset impairment losses			305,715	0
Goodwill impairment loss			31,123	0
Gain from insurance recoveries			$ 0	$ (78,756)

XML

DISCONTINUED OPERATIONS AND IMPAIRMENTS Narrative 3 (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment losses	$ 8,400,000	$ 297,300,000	$ 305,715,000	$ 0
Goodwill impairment loss			31,123,000	$ 0
Goodwill	$ 1,005,853,000		$ 1,005,853,000		$ 1,005,853,000
St. Eustatius Bunkers [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment loss		31,100,000
Goodwill		$ 0

XML

DISCONTINUED OPERATIONS AND IMPAIRMENTS Table 3 (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	$ 301,529	$ 599,347
Liabilities held for sale	68,616	69,834
Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets	46,826	54,404
Property, plant and equipment, net	223,723	513,820
Goodwill	0	31,123
Other long-term assets, net	30,980	0
Total current liabilities	44,625	69,834
Total long-term liabilities	$ 23,991	$ 0

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 1 - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Contract assets
Noncurrent portion	$ 1,158	$ 282	$ 539	$ 171
Total	2,641	609	2,605	2,127
Additions	2,674	879
Transfer to accounts receivable	(2,638)	(2,397)
Total activity	36	(1,518)
Contract liabilities
Noncurrent portion	(39,973)	(34,669)	(38,945)	(46,361)
Total	(63,661)	(52,818)	(85,881)	(60,464)
Additions	(24,537)	(20,820)
Transfer to revenues, including amounts reported in discontinued operations	46,757	28,466
Total activity	22,220	7,646
Other Current Assets [Member]
Contract assets
Current portion/Held for sale	1,483	327	2,066	1,956
Accrued liabilities
Contract liabilities
Current portion/Held for sale	(23,688)	(17,881)	(21,579)	(13,801)
Assets held for sale
Contract assets
Current portion/Held for sale	0	0	0	0
Liabilities held for sale
Contract liabilities
Current portion/Held for sale	$ 0	$ (268)	$ (25,357)	$ (302)

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative 1 (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Revenue recognized		$ 46,757	$ 28,466
Petroleos de Venezuela, S.A. (PDVSA) [Member]
Revenue recognized	$ 16,300

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 2 - Expected Timing of Satisfaction of Performance Obligations (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 252,055
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 422,044
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	$ 290,290
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	$ 241,784
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	$ 172,720
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,711,675
Revenue, remaining performance obligation, expected timing of satisfaction, period

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative 2 (Details) $ in Millions	Jun. 30, 2019 USD ($)
The St. Eustatius Disposition [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Remaining performance obligation	$ 9.4

XML

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 3 - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 372,445	$ 389,256	$ 720,271	$ 765,983
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	(133)	(4)	(274)
Pipeline Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	169,827	150,276	323,411	287,012
Lessor revenues	2,666	0	5,333	54
Total revenues	172,493	150,276	328,744	287,066
Pipeline Segment | Crude Oil Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	77,293	60,507	145,771	113,944
Pipeline Segment | Refined Products and Ammonia Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	92,534	89,769	177,640	173,068
Storage Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	100,209	104,858	193,516	206,316
Lessor revenues	10,194	9,962	20,387	19,924
Total revenues	110,403	114,820	213,903	226,240
Storage Segment | Throughput Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	23,170	20,140	44,856	40,157
Storage Segment | Storage Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	77,039	84,718	148,660	166,159
Fuels Marketing Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	89,549	124,293	177,628	252,951
Total revenues	$ 89,549	$ 124,293	$ 177,628	$ 252,951

XML

DEBT Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 22, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt		$ 3,401,220		$ 3,401,220	$ 3,111,996
Logistics revolving credit agreement [Member]
Debt Instrument [Line Items]
Long-term debt		543,000		543,000
Maximum borrowing capacity		$ 1,400,000		$ 1,400,000
Interest rate at period end - Revolving Credit Agreement		4.40%		4.40%
Covenant terms				For the rolling period of four quarters ending June 30, 2019, the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) could not exceed 5.00-to-1.00 and the consolidated interest coverage ratio (as defined in the Revolving Credit Agreement) must not be less than 1.75-to-1.00.
Current remaining borrowing capacity		$ 853,500		$ 853,500
Receivables Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term debt		62,800		62,800
Maximum borrowing capacity		$ 125,000		$ 125,000
Weighted average interest rate		3.30%		3.30%
Collateral amount		$ 100,300		$ 100,300
Logistics Notes due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500,000
Stated interest rate		6.00%		6.00%
Debt instrument, maturity date				Jun. 01, 2026
Proceeds from note offering, net of issuance costs	$ 491,700
Debt instrument, redemption, description				At the option of NuStar Logistics, the 6.0% senior notes may be redeemed in whole or in part at any time at a redemption price, plus accrued and unpaid interest to the redemption date. If we undergo a change of control, as defined in the supplemental indenture, each holder of the notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes repurchased, plus any accrued and unpaid interest to the date of repurchase.
Standard & Poor's, BB Rating [Member]
Debt Instrument [Line Items]
Credit rating			BB
Standard & Poor's, BB- Rating [Member]
Debt Instrument [Line Items]
Credit rating		BB-

XML

COMMITMENTS AND CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual, at carrying value	$ 2.8	$ 2.8

XML

LEASE ASSETS AND LIABILITIES Narrative 1 (Details) $ in Millions	Jan. 01, 2019 USD ($)
Leases [Abstract]
Right-of-use assets recognized at transition	$ 207.0
Lease liabilities recognized at transition	$ 192.0

XML

LEASE ASSETS AND LIABILITIES Narrative 2 (Details)	6 Months Ended
	Jun. 30, 2019
Lessee, Finance Lease, Description [Abstract]
Lessee, finance lease, remaining term	2 years
Number of renewal periods	4
Lessee, finance lease, renewal term	5 years
St Eustatius Tugs and Barges [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, renewal term	10 years
St Eustatius Tugs and Barges [Member] | Minimum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	1 year
St Eustatius Tugs and Barges [Member] | Maximum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	9 years
Land and Dock Leases [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, renewal term	15 years
Land and Dock Leases [Member] | Minimum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	3 years
Land and Dock Leases [Member] | Maximum [Member]
Operating Lease Type [Line Items]
Lessee, operating lease, remaining term	17 years

XML

LEASE ASSETS AND LIABILITIES Table 1 - Schedule of Right-of-Use Assets and Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Right-of-Use Assets:
Accumulated amortization on finance right-of-use asset	$ 1,741
Lease Liabilities:
Total operating lease liabilities	117,236
Total finance lease liabilities	59,328
Other long-term assets, net
Right-of-Use Assets:
Operating lease	86,414
Assets held for sale
Right-of-Use Assets:
Operating lease	30,980
Property, plant and equipment, net of accumulated amortization
Right-of-Use Assets:
Finance lease	73,982
Accrued liabilities
Lease Liabilities:
Operating lease, current	11,832
Liabilities held for sale
Lease Liabilities:
Operating lease, current	31,681
Other long-term liabilities
Lease Liabilities:
Operating lease, noncurrent	73,723
Short-term debt and current portion of finance leases
Lease Liabilities:
Finance lease, current	4,087
Long-term debt
Lease Liabilities:
Finance lease, noncurrent	$ 55,241

XML

LEASE ASSETS AND LIABILITIES Table 2 - Maturity Analysis of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019 (remaining)	$ 13,042
2020	17,053
2021	13,180
2022	12,622
2023	11,654
Thereafter	79,789
Total lease payments	147,340
Less: Interest	30,104
Present value of lease liabilities	117,236
Finance Lease Liabilities, Payments, Due [Abstract]
2019 (remaining)	3,022
2020	6,044
2021	4,594
2022	3,939
2023	3,896
Thereafter	63,281
Total lease payments	84,776
Less: Interest	25,448
Present value of lease liabilities	$ 59,328

XML

LEASE ASSETS AND LIABILITIES Table 3 - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 9,477	$ 18,941
Amortization of right-of-use assets	900	1,741
Interest expense on lease liability	550	1,099
Short-term lease cost	5,609	9,923
Variable lease cost	977	1,788
Total lease cost	$ 17,513	$ 33,492

XML

LEASE ASSETS AND LIABILITIES Table 4 - Additional Lease Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) Rate
Leases, Operating [Abstract]
Cash outflows from operating activities	$ 18,710
Right-of-use assets obtained in exchange for lease liabilities	$ 1,352
Weighted-average remaining lease term (in years)	13 years
Weighted-average discount rate | Rate	3.60%
Leases, Finance [Abstract]
Cash outflows from operating activities	$ 916
Cash outflows from financing activities	1,569
Right-of-use assets obtained in exchange for lease liabilities	$ 1,452
Weighted-average remaining lease term (in years)	22 years
Weighted-average discount rate | Rate	3.70%

XML

LEASE ASSETS AND LIABILITIES Narrative 3 (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Operating Leased Assets [Line Items]
Lessor, operating lease, term of contract	10 years
Lessor, operating lease, expected minimum lease payments	$ 293.0
Pipeline, storage and terminals
Operating Leased Assets [Line Items]
Lease storage assets, estimated useful life	30 years
Lease storage assets, cost	$ 233.4
Lease storage assets, accumulated depreciation	117.3
Service revenues [Member]
Operating Leased Assets [Line Items]
Lessor, operating lease, lease revenues	$ 20.4

XML

DERIVATIVES AND FAIR VALUE MEASUREMENTS Narrative (Details) - Interest rate swaps - Cash Flow Hedges - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps interest rate received	receive a rate based on the three-month USD LIBOR.
Notional amount of forward-starting interest rate swaps	$ 250.0	$ 250.0

XML

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 1 - Fair Values of Derivative Instruments (Details) - Fair Value, Inputs, Level 2 [Member] - Interest rate swaps - Designated as Hedging Instruments - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other long-term assets, net
Derivatives, Fair Value
Asset Derivatives	$ 0	$ 627
Liability Derivatives	0	0
Other long-term liabilities
Derivatives, Fair Value
Asset Derivatives	0	0
Liability Derivatives	$ (16,716)	$ (751)

XML

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 2 - Impact of Derivatives on Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) to be reclassified during next 12 months, forward-starting interest rate swaps	$ (3,000)		$ (3,000)
Interest rate swaps | Other comprehensive income | Designated as Hedging Instruments | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss) on derivative	(9,784)	$ 5,106	(16,592)	$ 22,527
Interest rate swaps | Interest expense, net | Designated as Hedging Instruments | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from AOCI into interest expense, net	$ (1,005)	$ (1,162)	$ (2,083)	$ (2,552)

XML

DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 3 - Estimated Fair Values and Carrying Amounts of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value, long-term debt	$ 3,473,806	$ 3,056,704
Long-term debt	$ 3,401,220	$ 3,111,996

XML

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative (Details) - Series D Preferred Limited Partner [Member] - $ / shares	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Class of Stock [Line Items]
Distribution payment date, preferred units		Sep. 17, 2018
Preferred Stock, Distributions, Period - June 29, 2018 to June 28, 2020 [Member]
Class of Stock [Line Items]
Preferred units distribution percentage			9.75%
Preferred stock, dividend amount, per unit			$ 0.619
Preferred Stock, Distributions, Period - June 29, 2020 to June 28, 2023 [Member]
Class of Stock [Line Items]
Preferred units distribution percentage			10.75%
Preferred stock, dividend amount, per unit			$ 0.682
Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]
Class of Stock [Line Items]
Preferred stock, dividend amount, per unit			$ 0.872
Preferred units, dividend payment rate, variable			the greater of 13.75% per annum (or $0.872 per unit per distribution period) or the distribution per common unit thereafter
Preferred Stock Distributions, Period - June 16, 2019 and thereafter [Member]
Class of Stock [Line Items]
Required amount of per unit cash dividends to permit dividend paid in kind			$ 0.635
Subsequent Event [Member]
Class of Stock [Line Items]
Preferred unit distribution	$ 0.619
Minimum [Member] | Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]
Class of Stock [Line Items]
Preferred units distribution percentage			13.75%
Equity Issuance Date, June 29, 2018 [Member]
Class of Stock [Line Items]
Preferred unit distribution		$ 0.525
Equity Issuance Date, July 13, 2018 [Member]
Class of Stock [Line Items]
Preferred unit distribution		$ 0.431

XML

PARTNERS' EQUITY Table 1 - Cash Distributions - Preferred Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Series A Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Preferred units distribution percentage				8.50%
Preferred unit distribution		$ 0.53125
Fixed distribution per quarter		$ 4,813
Series B Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Preferred units distribution percentage				7.625%
Preferred unit distribution		$ 0.47657
Fixed distribution per quarter		$ 7,339
Series C Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Preferred units distribution percentage				9.00%
Preferred unit distribution		$ 0.56250
Fixed distribution per quarter		$ 3,881
Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Fixed distribution per quarter		$ 16,033	$ 16,033	$ 32,066	$ 32,023
Subsequent Event [Member] | Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Distribution payment date, preferred units	Sep. 16, 2019

XML

PARTNERS' EQUITY Narrative (Details)	6 Months Ended
	Jun. 30, 2019
Class of Stock [Line Items]
Percent of available cash distributed	100.00%
Number of days within which distribution is paid to common unitholders	45

XML

PARTNERS' EQUITY Table 2 - Cash Distributions Declared - Common Limited Partners (Details) - Common Limited Partner [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019
Distribution Made to Common Limited Partners [Line Items]
Cash distributions per unit	$ 0.60	$ 0.60
Cash distributions applicable to common unitholders (distribution earned)	$ 64,658	$ 64,690
Distribution date of record (distribution earned)	Aug. 07, 2019	May 08, 2019
Distribution payment date (distribution earned)	Aug. 13, 2019	May 14, 2019

XML

PARTNERS' EQUITY Table 3 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	$ (54,878)
Balance as of June 30, 2019	(67,663)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	(47,299)
Other comprehensive income (loss) before reclassification adjustments	2,868
Other	0
Other comprehensive income (loss)	2,868
Balance as of June 30, 2019	(44,431)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	(893)
Other comprehensive income (loss) before reclassification adjustments	(16,592)
Other	0
Other comprehensive income (loss)	(14,509)
Balance as of June 30, 2019	(15,402)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	(6,686)
Other comprehensive income (loss) before reclassification adjustments	0
Other	13
Other comprehensive income (loss)	(1,144)
Balance as of June 30, 2019	(7,830)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2019	(54,878)
Other comprehensive income (loss) before reclassification adjustments	(13,724)
Other	13
Other comprehensive income (loss)	(12,785)
Balance as of June 30, 2019	(67,663)
Other income, net | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0
Other income, net | Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0
Other income, net | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	(1,157)
Other income, net | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	(1,157)
Interest expense, net | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0
Interest expense, net | Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	2,083
Interest expense, net | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0
Interest expense, net | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	$ 2,083

XML

NET INCOME (LOSS) PER COMMON UNIT Table - Net Income (Loss) per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 45,951	$ 29,399	$ (231,912)	$ 155,532
Distributions to preferred limited partners	(30,423)	(16,245)	(60,846)	(32,235)
Distributions to general partner	0	0	0	(1,141)
Distributions to common limited partners	(64,658)	(64,205)	(129,348)	(120,121)
Distribution equivalent rights to restricted units	(642)	(480)	(1,285)	(925)
Distributions (in excess of) less than income (loss)	(49,772)	(51,531)	(423,391)	1,110
Distributions to common limited partners	64,658	64,205	129,348	120,121
Allocation of distributions (in excess of) less than income (loss)	(49,772)	(50,500)	(423,391)	1,079
Series D Preferred Unit accretion	(4,446)	0	(8,748)	0
Net income (loss) attributable to common units	$ 10,440	$ 13,705	$ (302,791)	$ 121,200
Basic weighted-average common units outstanding	107,763,016	93,192,238	107,647,957	93,187,038
Basic net (loss) income per common unit	$ 0.10	$ 0.15	$ (2.81)	$ 1.30

XML

STATEMENTS OF CASH FLOWS Table 1 - Changes in Current Assets and Current Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Decrease (increase) in current assets:
Accounts receivable	$ (3,146)	$ 34,518
Receivable from related party	0	130
Inventories	1,551	(1,233)
Other current assets	(4,075)	(2,494)
Increase (decrease) in current liabilities:
Accounts payable	7,704	5,149
Accrued interest payable	2,636	(4,325)
Accrued liabilities	(34,814)	10,476
Taxes other than income tax	(3,556)	1,329
Income tax payable	(2,529)	(817)
Changes in current assets and current liabilities	$ (36,229)	$ 42,733

XML

STATEMENTS OF CASH FLOWS Table 2 - Cash Flows Related to Interest and Income Taxes (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Cash paid for interest, net of amount capitalized	$ 84,677	$ 96,761
Cash paid for income taxes, net of tax refunds received	$ 6,557	$ 7,973

XML

STATEMENTS OF CASH FLOWS Table 3 - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Cash, cash equivalents and restricted cash	$ 24,882	$ 13,644	$ 20,344	$ 24,292
Cash and cash equivalents [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash, cash equivalents and restricted cash	15,299	11,529
Prepaid and other current assets
Restricted Cash and Cash Equivalents Items [Line Items]
Cash, cash equivalents and restricted cash	8,744	0
Assets held for sale
Restricted Cash and Cash Equivalents Items [Line Items]
Cash, cash equivalents and restricted cash	$ 839	$ 2,115

XML

EMPLOYEE BENEFIT PLANS AND UNIT-BASED COMPENSATION Table - Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,387	$ 2,405	$ 4,775	$ 4,811
Interest cost	1,370	1,206	2,740	2,412
Expected return on assets	(2,003)	(1,854)	(4,007)	(3,709)
Amortization of prior service credit	(514)	(514)	(1,028)	(1,028)
Amortization of net loss	212	543	423	1,087
Net periodic benefit cost (income)	1,452	1,786	2,903	3,573
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	108	126	215	252
Interest cost	113	107	227	215
Expected return on assets	0	0	0	0
Amortization of prior service credit	(286)	(286)	(573)	(573)
Amortization of net loss	10	53	21	107
Net periodic benefit cost (income)	$ (55)	$ 0	$ (110)	$ 1

XML

EMPLOYEE BENEFIT PLANS AND UNIT-BASED COMPENSATION Narrative (Details)	Apr. 23, 2019 shares
Unit-Based Compensation 2019 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation, number of units authorized	2,500,000

XML

SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total revenues	$ 372,445	$ 389,256	$ 720,271	$ 765,983
Operating income:
General and administrative expenses	24,868	26,754	50,559	44,896
Other depreciation and amortization expense	1,819	2,158	3,938	4,197
Operating income (loss)	93,283	76,387	166,888	159,880
Pipeline Segment
Revenues:
Total revenues	172,493	150,276	328,744	287,066
Storage Segment
Revenues:
Total revenues	110,403	114,820	213,903	226,240
Storage Segment | Third Party Revenue [Member]
Revenues:
Total revenues	110,403	114,687	213,899	225,966
Storage Segment | Intersegment Revenue [Member]
Revenues:
Total revenues	0	133	4	274
Fuels Marketing Segment
Revenues:
Total revenues	89,549	124,293	177,628	252,951
Total segment
Operating income:
Operating income (loss)	119,970	105,299	221,385	208,973
Total segment | Pipeline Segment
Operating income:
Operating income (loss)	78,712	62,979	146,016	120,773
Total segment | Storage Segment
Operating income:
Operating income (loss)	38,098	38,781	70,316	81,868
Total segment | Fuels Marketing Segment
Operating income:
Operating income (loss)	3,160	3,536	5,085	6,332
Intersegment Eliminations [Member]
Revenues:
Total revenues	0	(133)	(4)	(274)
Operating income:
Operating income (loss)	0	3	(32)	0
Consolidation and intersegment eliminations
Operating income:
General and administrative expenses	24,868	26,754	50,559	44,896
Other depreciation and amortization expense	$ 1,819	$ 2,158	$ 3,938	$ 4,197

XML

SEGMENT INFORMATION Table 2 - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Information
Total assets	$ 6,379,691	$ 6,349,140
Total segment assets
Segment Information
Total assets	5,892,367	5,577,242
Total segment assets | Pipeline Segment
Segment Information
Total assets	3,824,047	3,637,226
Total segment assets | Storage Segment
Segment Information
Total assets	2,028,427	1,902,764
Total segment assets | Fuels Marketing Segment
Segment Information
Total assets	39,893	37,252
Assets held for sale
Segment Information
Total assets	301,529	599,347
Other partnership assets
Segment Information
Total assets	$ 185,795	$ 172,551

XML

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Narrative (Details) - NuStar Energy	6 Months Ended
	Jun. 30, 2019
NuPOP
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%
NuStar Logistics
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	100.00%

XML

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 15,299		$ 11,529	$ 20,344		$ 24,292
Receivables, net	117,688		110,417
Inventories	9,454		8,434
Prepaid and other current assets	29,591		17,374
Assets held for sale	301,529		599,347
Intercompany receivable	0		0
Total current assets	473,561		747,101
Property, plant and equipment, net	4,020,814		3,774,802
Intangible assets, net	707,344		733,056
Goodwill	1,005,853		1,005,853
Investment in wholly owned subsidiaries	0		0
Other long-term assets, net	172,119		88,328
Total assets	6,379,691		6,349,140
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	128,547		103,122
Short-term debt and current portion of finance leases	10,087		18,500
Accrued interest payable	38,929		36,293
Accrued liabilities	69,970		74,418
Taxes other than income tax	14,060		16,823
Income tax payable	1,920		4,445
Liabilities held for sale	68,616		69,834
Intercompany payable	0		0
Total current liabilities	332,129		323,435
Long-term debt	3,456,461		3,111,996
Deferred income tax liability	12,250		12,428
Other long-term liabilities	176,951		79,558
Series D preferred units	572,597	$ 568,293	563,992	370,711	$ 0	0
Total partners' equity	1,829,303	$ 1,888,677	2,257,731	2,456,477	$ 2,492,057	2,480,089
Total liabilities, mezzanine equity and partners’ equity	6,379,691		6,349,140
Eliminations [Member]
Assets
Cash and cash equivalents	0		0	0		0
Receivables, net	0		0
Inventories	0		0
Prepaid and other current assets	0		0
Assets held for sale	0		0
Intercompany receivable	(1,859,852)		(1,828,416)
Total current assets	(1,859,852)		(1,828,416)
Property, plant and equipment, net	0		0
Intangible assets, net	0		0
Goodwill	0		0
Investment in wholly owned subsidiaries	(6,298,321)		(7,388,660)
Other long-term assets, net	0		0
Total assets	(8,158,173)		(9,217,076)
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	0		0
Short-term debt and current portion of finance leases	0		0
Accrued interest payable	0		0
Accrued liabilities	0		0
Taxes other than income tax	0		0
Income tax payable	0		0
Liabilities held for sale	0		0
Intercompany payable	(1,859,852)		(1,828,416)
Total current liabilities	(1,859,852)		(1,828,416)
Long-term debt	0		0
Deferred income tax liability	0		0
Other long-term liabilities	0		0
Series D preferred units	0		0
Total partners' equity	(6,298,321)		(7,388,660)
Total liabilities, mezzanine equity and partners’ equity	(8,158,173)		(9,217,076)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	486		1,255	896		885
Receivables, net	0		0
Inventories	0		0
Prepaid and other current assets	110		61
Assets held for sale	0		0
Intercompany receivable	0		0
Total current assets	596		1,316
Property, plant and equipment, net	0		0
Intangible assets, net	0		0
Goodwill	0		0
Investment in wholly owned subsidiaries	2,934,489		3,355,636
Other long-term assets, net	57		304
Total assets	2,935,142		3,357,256
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	5,586		6,460
Short-term debt and current portion of finance leases	0		0
Accrued interest payable	0		0
Accrued liabilities	866		1,280
Taxes other than income tax	8		125
Income tax payable	0		0
Liabilities held for sale	0		0
Intercompany payable	459,119		472,790
Total current liabilities	465,579		480,655
Long-term debt	0		0
Deferred income tax liability	0		0
Other long-term liabilities	0		0
Series D preferred units	572,597		563,992
Total partners' equity	1,896,966		2,312,609
Total liabilities, mezzanine equity and partners’ equity	2,935,142		3,357,256
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	332		51	1,777		29
Receivables, net	1,692		2,212
Inventories	1,924		1,741
Prepaid and other current assets	25,619		14,422
Assets held for sale	0		0
Intercompany receivable	1,462,583		1,327,833
Total current assets	1,492,150		1,346,259
Property, plant and equipment, net	2,023,613		1,858,264
Intangible assets, net	44,395		49,107
Goodwill	149,453		149,453
Investment in wholly owned subsidiaries	1,713,256		1,750,256
Other long-term assets, net	103,408		54,429
Total assets	5,526,275		5,207,768
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	51,193		39,680
Short-term debt and current portion of finance leases	9,940		18,500
Accrued interest payable	38,891		36,253
Accrued liabilities	28,558		24,858
Taxes other than income tax	6,090		7,285
Income tax payable	217		457
Liabilities held for sale	0		0
Intercompany payable	0		0
Total current liabilities	134,889		127,033
Long-term debt	3,393,447		3,050,531
Deferred income tax liability	1,675		1,675
Other long-term liabilities	88,772		28,392
Series D preferred units	0		0
Total partners' equity	1,907,492		2,000,137
Total liabilities, mezzanine equity and partners’ equity	5,526,275		5,207,768
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	0		0	0		0
Receivables, net	0		0
Inventories	3,169		5,237
Prepaid and other current assets	1,059		908
Assets held for sale	0		0
Intercompany receivable	0		0
Total current assets	4,228		6,145
Property, plant and equipment, net	609,798		615,549
Intangible assets, net	0		0
Goodwill	170,652		170,652
Investment in wholly owned subsidiaries	1,135,618		1,425,283
Other long-term assets, net	32,557		26,716
Total assets	1,952,853		2,244,345
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	6,287		6,331
Short-term debt and current portion of finance leases	131		0
Accrued interest payable	0		0
Accrued liabilities	8,942		8,082
Taxes other than income tax	5,955		4,718
Income tax payable	1		2
Liabilities held for sale	0		0
Intercompany payable	1,400,733		1,355,626
Total current liabilities	1,422,049		1,374,759
Long-term debt	512		0
Deferred income tax liability	9		9
Other long-term liabilities	15,471		12,348
Series D preferred units	0		0
Total partners' equity	514,812		857,229
Total liabilities, mezzanine equity and partners’ equity	1,952,853		2,244,345
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	14,481		10,223	$ 17,671		$ 23,378
Receivables, net	115,996		108,205
Inventories	4,361		1,456
Prepaid and other current assets	2,803		1,983
Assets held for sale	301,529		599,347
Intercompany receivable	397,269		500,583
Total current assets	836,439		1,221,797
Property, plant and equipment, net	1,387,403		1,300,989
Intangible assets, net	662,949		683,949
Goodwill	685,748		685,748
Investment in wholly owned subsidiaries	514,958		857,485
Other long-term assets, net	36,097		6,879
Total assets	4,123,594		4,756,847
Liabilities, Mezzanine Equity and Partners’ Equity
Accounts payable	65,481		50,651
Short-term debt and current portion of finance leases	16		0
Accrued interest payable	38		40
Accrued liabilities	31,604		40,198
Taxes other than income tax	2,007		4,695
Income tax payable	1,702		3,986
Liabilities held for sale	68,616		69,834
Intercompany payable	0		0
Total current liabilities	169,464		169,404
Long-term debt	62,502		61,465
Deferred income tax liability	10,566		10,744
Other long-term liabilities	72,708		38,818
Series D preferred units	0		0
Total partners' equity	3,808,354		4,476,416
Total liabilities, mezzanine equity and partners’ equity	$ 4,123,594		$ 4,756,847

XML

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 2 - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 372,445	$ 389,256	$ 720,271	$ 765,983
Costs and expenses	279,162	312,869	553,383	606,103
Operating income (loss)	93,283	76,387	166,888	159,880
Equity in earnings (loss) of subsidiaries	0	0	0	0
Interest income (expense), net	(45,693)	(48,389)	(89,984)	(95,777)
Other income (expense), net	621	1,607	1,412	2,623
Income (loss) from continuing operations before income tax expense	48,211	29,605	78,316	66,726
Income tax expense (benefit)	1,296	2,696	2,478	6,584
Income (loss) from continuing operations, net of tax	46,915	26,909	75,838	60,142
(Loss) income from discontinued operations, net of tax	(964)	2,490	(307,750)	95,390
Net income (loss)	45,951	29,399	(231,912)	155,532
Comprehensive income (loss)	37,992	26,778	(244,697)	173,835
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	(185)	(147)	(372)	(349)
Costs and expenses	(185)	(147)	(372)	(349)
Operating income (loss)	0	0	0	0
Equity in earnings (loss) of subsidiaries	(107,613)	(92,940)	(184,466)	(182,346)
Interest income (expense), net	0	0	0	0
Other income (expense), net	0	0	0	0
Income (loss) from continuing operations before income tax expense	(107,613)	(92,940)	(184,466)	(182,346)
Income tax expense (benefit)	0	0	0	0
Income (loss) from continuing operations, net of tax	(107,613)	(92,940)	(184,466)	(182,346)
(Loss) income from discontinued operations, net of tax	18,717	(7,470)	939,075	(286,170)
Net income (loss)	(88,896)	(100,410)	754,609	(468,516)
Comprehensive income (loss)	(88,896)	(100,410)	754,609	(468,516)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0	0	0
Costs and expenses	699	538	1,375	1,150
Operating income (loss)	(699)	(538)	(1,375)	(1,150)
Equity in earnings (loss) of subsidiaries	47,499	27,410	76,990	61,223
Interest income (expense), net	117	37	225	69
Other income (expense), net	0	0	0	0
Income (loss) from continuing operations before income tax expense	46,917	26,909	75,840	60,142
Income tax expense (benefit)	2	0	2	0
Income (loss) from continuing operations, net of tax	46,915	26,909	75,838	60,142
(Loss) income from discontinued operations, net of tax	(964)	2,490	(307,750)	95,390
Net income (loss)	45,951	29,399	(231,912)	155,532
Comprehensive income (loss)	45,951	29,399	(231,912)	155,532
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	130,136	117,862	247,691	237,556
Costs and expenses	83,029	86,588	160,440	159,004
Operating income (loss)	47,107	31,274	87,251	78,552
Equity in earnings (loss) of subsidiaries	10,990	1,692	12,329	(557)
Interest income (expense), net	(47,016)	(50,357)	(92,472)	(100,383)
Other income (expense), net	743	1,848	1,497	2,324
Income (loss) from continuing operations before income tax expense	11,824	(15,543)	8,605	(20,064)
Income tax expense (benefit)	(469)	61	(352)	231
Income (loss) from continuing operations, net of tax	12,293	(15,604)	8,957	(20,295)
(Loss) income from discontinued operations, net of tax	7,912	0	7,912	0
Net income (loss)	20,205	(15,604)	16,869	(20,295)
Comprehensive income (loss)	11,426	(9,336)	2,360	4,784
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	64,452	66,505	122,805	122,779
Costs and expenses	41,235	42,324	77,285	77,505
Operating income (loss)	23,217	24,181	45,520	45,274
Equity in earnings (loss) of subsidiaries	13,785	20,655	26,523	39,758
Interest income (expense), net	(1,840)	(1,724)	(3,773)	(3,295)
Other income (expense), net	178	73	355	188
Income (loss) from continuing operations before income tax expense	35,340	43,185	68,625	81,925
Income tax expense (benefit)	1	0	1	1
Income (loss) from continuing operations, net of tax	35,339	43,185	68,624	81,924
(Loss) income from discontinued operations, net of tax	(8,877)	2,490	(315,663)	95,390
Net income (loss)	26,462	45,675	(247,039)	177,314
Comprehensive income (loss)	26,462	45,675	(247,039)	177,314
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	178,042	205,036	350,147	405,997
Costs and expenses	154,384	183,566	314,655	368,793
Operating income (loss)	23,658	21,470	35,492	37,204
Equity in earnings (loss) of subsidiaries	35,339	43,183	68,624	81,922
Interest income (expense), net	3,046	3,655	6,036	7,832
Other income (expense), net	(300)	(314)	(440)	111
Income (loss) from continuing operations before income tax expense	61,743	67,994	109,712	127,069
Income tax expense (benefit)	1,762	2,635	2,827	6,352
Income (loss) from continuing operations, net of tax	59,981	65,359	106,885	120,717
(Loss) income from discontinued operations, net of tax	(17,752)	4,980	(631,324)	190,780
Net income (loss)	42,229	70,339	(524,439)	311,497
Comprehensive income (loss)	$ 43,049	$ 61,450	$ (522,715)	$ 304,721

XML

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 3 - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net cash provided by operating activities	$ 240,894	$ 243,850
Cash flows from investing activities:
Capital expenditures	(319,961)	(248,521)
Change in accounts payable related to capital expenditures	16,144	(19,320)
Proceeds from sale or disposition of assets	143	2,097
Investment In subsidiaries	0
Proceeds from insurance recoveries	0	78,419
Acquisitions	0	(37,502)
Net cash used in investing activities	(303,674)	(224,827)
Cash flows from financing activities:
Debt borrowings	594,300	1,133,272
Debt repayments	(807,800)	(1,333,521)
Proceeds from note offering, net of issuance costs	491,665	0
Proceeds from issuance of Series D preferred units	0	400,000
Payment of issuance costs for Series D preferred units	0	(29,289)
Issuance of common units	0	10,000
Distributions to preferred unitholders	(60,846)	(32,713)
Distributions to common unitholders and general partner	(129,025)	(172,324)
Proceeds from termination of interest rate swaps	0	8,048
Contributions from affiliates	0
Net intercompany activity	0	0
Payment of tax withholding for unit-based compensation	(6,368)	(69)
Other, net	(8,169)	(6,023)
Net cash provided by (used in) financing activities	73,757	(22,550)
Effect of foreign exchange rate changes on cash	261	(421)
Net increase (decrease) in cash, cash equivalents and restricted cash	11,238	(3,948)
Cash, cash equivalents and restricted cash as of the beginning of the period	13,644	24,292
Cash, cash equivalents and restricted cash as of the end of the period	24,882	20,344
Cash and cash equivalents as of the beginning of the period	11,529	24,292
Cash and cash equivalents as of the end of the period	15,299	20,344
Eliminations [Member]
Cash flows from operating activities:
Net cash provided by operating activities	(284,816)	(307,567)
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
Investment In subsidiaries	11,999
Proceeds from insurance recoveries		0
Acquisitions		0
Net cash used in investing activities	11,999	0
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
Issuance of common units		0
Distributions to preferred unitholders	91,272	49,071
Distributions to common unitholders and general partner	193,544	258,496
Proceeds from termination of interest rate swaps		0
Contributions from affiliates	(11,999)
Net intercompany activity	0	0
Payment of tax withholding for unit-based compensation	0
Other, net	0	0
Net cash provided by (used in) financing activities	272,817	307,567
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash as of the beginning of the period	0
Cash, cash equivalents and restricted cash as of the end of the period	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	187,265	200,803
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
Investment In subsidiaries	0
Proceeds from insurance recoveries		0
Acquisitions		0
Net cash used in investing activities	0	0
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		400,000
Payment of issuance costs for Series D preferred units		(29,289)
Issuance of common units		10,000
Distributions to preferred unitholders	(60,846)	(32,713)
Distributions to common unitholders and general partner	(129,025)	(172,324)
Proceeds from termination of interest rate swaps		0
Contributions from affiliates	0
Net intercompany activity	9,641	(374,973)
Payment of tax withholding for unit-based compensation	(6,368)
Other, net	(1,436)	(1,493)
Net cash provided by (used in) financing activities	(188,034)	(200,792)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	(769)	11
Cash, cash equivalents and restricted cash as of the beginning of the period	1,255
Cash, cash equivalents and restricted cash as of the end of the period	486
Cash and cash equivalents as of the beginning of the period	1,255	885
Cash and cash equivalents as of the end of the period	486	896
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	77,144	31,209
Cash flows from investing activities:
Capital expenditures	(167,647)	(17,136)
Change in accounts payable related to capital expenditures	11,708	495
Proceeds from sale or disposition of assets	71	1,385
Investment In subsidiaries	(11,999)
Proceeds from insurance recoveries		0
Acquisitions		0
Net cash used in investing activities	(167,867)	(15,256)
Cash flows from financing activities:
Debt borrowings	570,500	1,122,272
Debt repayments	(785,000)	(1,316,621)
Proceeds from note offering, net of issuance costs	491,665
Proceeds from issuance of Series D preferred units		0
Payment of issuance costs for Series D preferred units		0
Issuance of common units		0
Distributions to preferred unitholders	(30,424)	(16,356)
Distributions to common unitholders and general partner	(64,512)	(86,162)
Proceeds from termination of interest rate swaps		8,048
Contributions from affiliates	0
Net intercompany activity	(75,900)	279,080
Payment of tax withholding for unit-based compensation	0
Other, net	(6,581)	(4,466)
Net cash provided by (used in) financing activities	99,748	(14,205)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	9,025	1,748
Cash, cash equivalents and restricted cash as of the beginning of the period	51
Cash, cash equivalents and restricted cash as of the end of the period	9,076
Cash and cash equivalents as of the beginning of the period	51	29
Cash and cash equivalents as of the end of the period	332	1,777
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net cash provided by operating activities	60,539	58,105
Cash flows from investing activities:
Capital expenditures	(9,131)	(8,164)
Change in accounts payable related to capital expenditures	522	(5,173)
Proceeds from sale or disposition of assets	26	16
Investment In subsidiaries	0
Proceeds from insurance recoveries		0
Acquisitions		(37,502)
Net cash used in investing activities	(8,583)	(50,823)
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
Issuance of common units		0
Distributions to preferred unitholders	(30,423)	(16,357)
Distributions to common unitholders and general partner	(64,512)	(86,162)
Proceeds from termination of interest rate swaps		0
Contributions from affiliates	0
Net intercompany activity	43,009	95,237
Payment of tax withholding for unit-based compensation	0
Other, net	(30)	0
Net cash provided by (used in) financing activities	(51,956)	(7,282)
Effect of foreign exchange rate changes on cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash as of the beginning of the period	0
Cash, cash equivalents and restricted cash as of the end of the period	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	200,762	261,300
Cash flows from investing activities:
Capital expenditures	(143,183)	(223,221)
Change in accounts payable related to capital expenditures	3,914	(14,642)
Proceeds from sale or disposition of assets	46	696
Investment In subsidiaries	0
Proceeds from insurance recoveries		78,419
Acquisitions		0
Net cash used in investing activities	(139,223)	(158,748)
Cash flows from financing activities:
Debt borrowings	23,800	11,000
Debt repayments	(22,800)	(16,900)
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
Issuance of common units		0
Distributions to preferred unitholders	(30,425)	(16,358)
Distributions to common unitholders and general partner	(64,520)	(86,172)
Proceeds from termination of interest rate swaps		0
Contributions from affiliates	11,999
Net intercompany activity	23,250	656
Payment of tax withholding for unit-based compensation	0
Other, net	(122)	(64)
Net cash provided by (used in) financing activities	(58,818)	(107,838)
Effect of foreign exchange rate changes on cash	261	(421)
Net increase (decrease) in cash, cash equivalents and restricted cash	2,982	(5,707)
Cash, cash equivalents and restricted cash as of the beginning of the period	12,338
Cash, cash equivalents and restricted cash as of the end of the period	15,320
Cash and cash equivalents as of the beginning of the period	10,223	23,378
Cash and cash equivalents as of the end of the period	$ 14,481	$ 17,671