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ORGANIZATION AND BASIS OF PRESENTATION Narrative 3 - Debt ammendments (Details) $ in Millions	Jun. 30, 2023 USD ($)
Revolving Credit Agreement [Member] \| Unsecured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000.0
Receivables Financing Agreement [Member] \| Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (SX 210.12-04(a))
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://www.xbrl.org/2003/role/exampleRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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Reference 21: http://www.xbrl.org/2003/role/disclosureRef
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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

PARTNERS' EQUITY

6 Months Ended

Jun. 30, 2023

Partners' Capital Notes [Abstract]

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) equal to the amount of 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.

Information on our Series A, B and C Preferred Units is shown below:

Units

Units Issued and Outstanding as of June 30, 2023

Optional Redemption Date/Date When Distribution Rate Became Floating

Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit)

Series A Preferred Units

9,060,000

December 15, 2021

Three-month LIBOR plus 6.766%

Series B Preferred Units

15,400,000

June 15, 2022

Three-month LIBOR plus 5.643%

Series C Preferred Units

6,900,000

December 15, 2022

Three-month LIBOR plus 6.88%

Distribution information on our Series A, B and C Preferred Units is as follows:


	Series A Preferred Units				Series B Preferred Units				Series C Preferred Units
Distribution Period	Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)				(Thousands of Dollars)				(Thousands of Dollars)

June 15, 2023 - September 14, 2023 (a)	$	0.76715	$	6,950	$	0.69696	$	10,733	$	0.77428	$	5,343
March 15, 2023 - June 14, 2023	$	0.73169	$	6,629	$	0.66150	$	10,187	$	0.73881	$	5,098
December 15, 2022 - March 14, 2023	$	0.71889	$	6,513	$	0.64871	$	9,990	$	0.72602	$	5,010

June 15, 2022 - September 14, 2022	$	0.54808	$	4,966	$	0.47789	$	7,360	$	0.56250	$	3,881
March 15, 2022 - June 14, 2022	$	0.47817	$	4,332	$	0.47657	$	7,339	$	0.56250	$	3,881
December 15, 2021 - March 14, 2022	$	0.43606	$	3,951	$	0.47657	$	7,339	$	0.56250	$	3,881

(a) Total distributions are estimated based on the number of units outstanding as of June 30, 2023.

In July 2023, our board of directors declared distributions with respect to the Series A, B and C Preferred Units to be paid on September 15, 2023.

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. In July 2023, our board of directors declared distributions with respect to our common units for the quarter ended June 30, 2023.

The following table summarizes information about cash distributions to our common limited partners applicable to the period in which the distributions were earned:


Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)

June 30, 2023	$	0.40	$	44,363	August 8, 2023	August 14, 2023
March 31, 2023	$	0.40	$	44,396	May 8, 2023	May 12, 2023
December 31, 2022	$	0.40	$	44,328	February 8, 2023	February 14, 2023

Accumulated Other Comprehensive Income (Loss) (AOCI)

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


	Three Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of April 1	$	497	$	(33,865)	$	1,967	$	(31,401)	$	(40,932)	$	(35,957)	$	3,843	$	(73,046)
Other comprehensive income before reclassification adjustments	249		—		—		249		1,133		—		—		1,133
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(736)		(736)		—		—		(420)		(420)
Net loss on cash flow hedges reclassified into interest expense, net	—		505		—		505		—		521		—		521
Other	—		—		(10)		(10)		—		—		(6)		(6)
Other comprehensive income (loss)	249		505		(746)		8		40,779		521		(426)		40,874
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)


	Six Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of January 1	$	62	$	(34,380)	$	2,713	$	(31,605)	$	(41,761)	$	(36,486)	$	4,269	$	(73,978)
Other comprehensive income before reclassification adjustments	684		—		—		684		1,962		—		—		1,962
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(1,473)		(1,473)		—		—		(840)		(840)
Net loss on cash flow hedges reclassified into interest expense, net	—		1,020		—		1,020		—		1,050		—		1,050
Other	—		—		(19)		(19)		—		—		(12)		(12)
Other comprehensive income (loss)	684		1,020		(1,492)		212		41,608		1,050		(852)		41,806
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)

As of June 30, 2023, we expect to reclassify a loss of $3.3 million to “Interest expense, net” within the next twelve months associated with unwound forward-starting interest rate swaps.

CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY AND MEZZANINE EQUITY (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Common Limited Partner [Member]
Cash distributions paid, per unit	$ 0.40	$ 0.40	$ 0.80	$ 0.80

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, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income (loss)	$ 46,141			$ 59,199	$ 152,077	$ 71,511
Distributions to preferred limited partners	(32,126)			(31,523)	(64,859)	(62,615)
Distributions to common limited partners	(44,363)	$ (44,396)	$ (44,328)	(44,128)	(88,759)	(88,293)
Distribution equivalent rights to restricted units	(667)			(617)	(1,339)	(1,250)
Distributions in excess of income	(31,015)			(17,069)	(2,880)	(80,647)
Distributions to common limited partners	44,363	$ 44,396	$ 44,328	44,128	88,759	88,293
Allocation of distributions in excess of income to common limited partners	(31,015)			(17,069)	(2,880)	(80,647)
Series D Preferred Unit accretion	(3,303)			(4,734)	(6,974)	(9,315)
Series D Preferred Unit redemption	(32,067)			0	(32,067)	0
Net (loss) income attributable to common units	$ (22,022)			$ 22,325	$ 46,838	$ (1,669)
Basic weighted-average common units outstanding	110,905,471			110,306,641	110,893,293	110,242,201
Diluted weighted-average common units outstanding	110,905,471			110,306,641	110,893,293	110,242,201
Basic net income (loss) per common unit	$ (0.20)			$ 0.20	$ 0.42	$ (0.02)
Diluted net income (loss) per common unit	$ (0.20)			$ 0.20	$ 0.42	$ (0.02)

COMMITMENTS AND CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual, at carrying value	$ 1.3	$ 0.3

SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating income:
Gain on sale of assets	$ 0	$ 0	$ 41,075	$ 0
General and administrative expenses	31,620	27,909	60,345	54,980
Other depreciation and amortization expense	1,037	1,823	2,592	3,647
Operating income (loss)	102,870	109,059	262,855	167,485
Storage Segment
Revenues:
Total revenues	78,209	88,783	158,866	176,704
Operating Segments, Net of Intersegment Eliminations
Revenues:
Total revenues	378,334	430,157	772,201	840,020
Total segment
Operating income:
Operating income (loss)	135,527	138,791	284,717	226,112
Total segment \| Pipeline Segment
Revenues:
Total revenues	206,701	200,565	419,884	389,248
Operating income:
Operating income (loss)	107,804	100,953	227,662	196,705
Total segment \| Storage Segment
Revenues:
Total revenues	78,209	88,783	158,866	176,704
Operating income:
Operating income (loss)	21,213	31,207	43,979	16,232
Total segment \| Fuels Marketing Segment
Revenues:
Total revenues	93,426	140,809	193,453	274,069
Operating income:
Operating income (loss)	6,510	6,631	13,076	13,175
Intersegment Eliminations [Member]
Revenues:
Total revenues	$ (2)	$ 0	$ (2)	$ (1)

DISPOSITIONS Narrative 1 - Sale Leaseback Transaction (Details) $ in Thousands		3 Months Ended			6 Months Ended
	Mar. 21, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Sale Leaseback Transaction [Line Items]
Cash sales price					$ 102,769	$ 59,531
Gain on Sale-Leaseback Transaction		$ 0		$ 0	$ 41,075	$ 0
Corporate headquarters facility and underlying land
Sale Leaseback Transaction [Line Items]
Number of acres of land sold	24
Cash sales price	$ 103,000
Initial term	20 years
Number of renewal periods	2
Renewal terms	10 years
Rent, annual increase rate			2.50%
Operating lease, reasonably certain lease term			20 years
Corporate headquarters facility and underlying land \| Gain on sale of assets
Sale Leaseback Transaction [Line Items]
Gain on Sale-Leaseback Transaction			$ 41,100
Corporate headquarters facility and underlying land \| April 1, 2023 - March 31, 2024
Sale Leaseback Transaction [Line Items]
Rent for initial term, starting rent for first year			$ 6,400

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 2 - Expected Timing of Satisfaction of Performance Obligations (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 1,141,643
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 204,812
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 337,666
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 229,535
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 163,771
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 81,059
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 124,800

SUPPLEMENTAL CASH FLOW INFORMATION

6 Months Ended

Jun. 30, 2023

Supplemental Cash Flow Information [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

Changes in current assets and current liabilities were as follows:


	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	12,356	$	(21,262)

Inventories	4,920		1,439

Other current assets	(3,508)		705
Increase (decrease) in current liabilities:
Accounts payable	(2,427)		5,082

Accrued interest payable	869		567
Accrued liabilities	(8,300)		(14,448)
Taxes other than income tax	(2,125)		(3,023)

Changes in current assets and current liabilities	$	1,785	$	(30,940)

The above changes in current assets and current liabilities may 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 accrued compensation expense paid with fully vested common unit awards; and

•current assets and current liabilities disposed of during the period.

Other supplemental cash flow information is as follows:


	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	110,195	$	95,112
Cash paid for income taxes, net of tax refunds received	$	2,842	$	3,646
Right-of-use assets obtained in exchange for operating lease liabilities	$	82,372	$	2,990
Right-of-use assets obtained in exchange for finance lease liabilities	$	1,818	$	1,342

Restricted cash, representing legally restricted funds that are unavailable for general use, is included in "Other long-term assets, net" on the consolidated balance sheets. “Cash, cash equivalents and restricted cash” on the consolidated statements of cash flows is included in the consolidated balance sheets as follows:


	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Cash and cash equivalents	$	3,813	$	14,489

Other long-term assets, net	9,056		8,888
Cash, cash equivalents and restricted cash	$	12,869	$	23,377

SUPPLEMENTAL CASH FLOW INFORMATION - Table 2 - Other Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of amount capitalized	$ 110,195	$ 95,112
Cash paid for income taxes, net of tax refunds received	2,842	3,646
Right-of-use assets obtained in exchange for operating lease liabilities	82,372	2,990
Right-of-use assets obtained in exchange for finance lease liabilities	$ 1,818	$ 1,342

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

6 Months Ended

Jun. 30, 2023

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:


	2023				2022
	Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,612	$	(17,647)	$	2,336	$	(15,443)
Noncurrent portion	304		(41,405)		504		(46,027)
Total	2,916		(59,052)		2,840		(61,470)

Activity:
Additions	3,782		(45,998)		2,112		(17,692)
Transfer to accounts receivable	(2,856)		—		(2,198)		—
Transfer to revenues	—		33,718		(83)		24,841

Total	926		(12,280)		(169)		7,149

Balances as of June 30:
Current portion	2,703		(27,379)		2,251		(13,555)
Noncurrent portion	1,139		(43,953)		420		(40,766)

Total	$	3,842	$	(71,332)	$	2,671	$	(54,321)

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, 2023:


	Remaining Performance Obligations
	(Thousands of Dollars)
2023 (remaining)	$	204,812
2024	337,666
2025	229,535
2026	163,771
2027	81,059
Thereafter	124,800
Total	$	1,141,643

Disaggregation of Revenue [Table Text Block]

The following table disaggregates our revenues:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	93,186	$	94,010	$	189,789	$	180,134
Refined products and ammonia pipelines	113,515		106,555		230,095		209,114
Total pipeline segment revenues from contracts with customers	206,701		200,565		419,884		389,248



Storage segment:
Throughput terminals	23,839		30,929		51,154		57,370
Storage terminals (excluding lessor revenues)	43,049		47,089		85,065		97,808
Total storage segment revenues from contracts with customers	66,888		78,018		136,219		155,178
Lessor revenues	11,321		10,765		22,647		21,526
Total storage segment revenues	78,209		88,783		158,866		176,704

Fuels marketing segment:
Revenues from contracts with customers	93,426		140,809		193,453		274,069

Consolidation and intersegment eliminations	(2)		—		(2)		(1)

Total revenues	$	378,334	$	430,157	$	772,201	$	840,020

DEBT

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

DEBT

Revolving Credit Agreement

On June 30, 2023, we amended our $1.0 billion unsecured revolving credit agreement (the Revolving Credit Agreement), mainly to extend the maturity date from April 27, 2025 to January 27, 2027. The amendment also includes a requirement that we certify that the sum of our Revolving Credit Agreement availability and unrestricted cash balance is no less than $150.0 million on a pro forma basis prior to using any borrowings under the Revolving Credit Agreement to redeem certain unsecured indebtedness or our Series D Preferred Units.

As of June 30, 2023, the Revolving Credit Agreement had $750.4 million available for borrowing and $245.0 million of borrowings outstanding. Letters of credit issued under the Revolving Credit Agreement totaled $4.6 million as of June 30, 2023 and limit the amount we can borrow under the Revolving Credit Agreement. Obligations under the Revolving Credit Agreement are guaranteed by NuStar Energy and NuPOP. The Revolving Credit Agreement provides for U.S. dollar borrowings, which bear interest, at our option, based on an alternative base rate or a SOFR-based rate. The Revolving Credit Agreement and certain fees under the Receivables Financing Agreement, defined below, are the only debt arrangements with interest rates that are subject to adjustment if our debt rating is downgraded (or upgraded) by certain credit rating agencies. As of June 30, 2023, our weighted-average interest rate related to borrowings under the Revolving Credit Agreement was 7.7%.

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 that is less than the total amount available for borrowing. For a rolling period of four quarters, the consolidated debt coverage ratio (as defined in the Revolving Credit Agreement) may 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, 2023, we believe that we are in compliance with the covenants in the Revolving Credit Agreement.

Receivables Financing Agreement

NuStar Energy and NuStar Finance LLC, a special purpose entity and wholly owned subsidiary of NuStar Energy, are parties to a $100.0 million receivables financing agreement with a third-party lender (the Receivables Financing Agreement) and agreements with certain of NuStar Energy’s wholly owned subsidiaries (collectively with the Receivables Financing Agreement, the Securitization Program). Under the Securitization Program, certain of NuStar Energy’s wholly owned subsidiaries sell their accounts receivable to NuStar Finance on an ongoing basis, and NuStar Finance provides the newly acquired accounts receivable as collateral for its revolving borrowings under the Receivables Financing Agreement. On June 29, 2023, we amended the Receivables Financing Agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. As of June 30, 2023, the amount of borrowings outstanding under the Receivables Financing Agreement totaled $71.2 million, the interest rate related to outstanding borrowings was 6.7% and $108.2 million of our accounts receivable was included in the Securitization Program.

Fair Value of Long-Term Debt

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


	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Fair value	$	3,250,699	$	3,169,664
Carrying amount	$	3,260,205	$	3,242,289

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. The carrying amount includes unamortized debt issuance costs.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

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+ Details

PARTNERS' EQUITY Narrative 1 (Details)	6 Months Ended
PARTNERS' EQUITY Narrative 1 (Details)	Jun. 30, 2023
Series A Preferred Limited Partner [Member] \| November 25, 2016 - December 14, 2021
Class of Stock [Line Items]
Preferred units distribution percentage	8.50%
Series B Preferred Limited Partner [Member] \| April 28, 2017 - June 14, 2022
Class of Stock [Line Items]
Preferred units distribution percentage	7.625%
Series C Preferred Limited Partner [Member] \| November 30, 2017 - December 14, 2022
Class of Stock [Line Items]
Preferred units distribution percentage	9.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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+ Details

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Table 2 - Distributions (Details) - Series D Preferred Limited Partner [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended
	Sep. 14, 2023	Jun. 30, 2023	Jun. 14, 2023	Mar. 14, 2023	Sep. 14, 2022	Jun. 30, 2022	Jun. 14, 2022	Mar. 14, 2022	Jun. 30, 2023	Jun. 30, 2022
Class of Stock [Line Items]
Cash distributions per unit applicable to limited partners			$ 0.682	$ 0.682	$ 0.682		$ 0.682	$ 0.682
Series D Preferred Units, accrued distributions		$ 10,014	$ 10,315	$ 11,148	$ 15,854	$ 15,854	$ 15,854	$ 15,854	$ 21,163	$ 31,708
Preferred Stock, Distributions, Period - June 15, 2023 and thereafter [Member] \| Minimum [Member]
Class of Stock [Line Items]
Preferred units distribution percentage, per annum									13.75%
Cash distributions per unit applicable to limited partners									$ 0.872
Subsequent Event [Member]
Class of Stock [Line Items]
Cash distributions per unit applicable to limited partners	$ 0.872
Series D Preferred Units, accrued distributions	$ 7,598

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

REVENUE FROM CONTRACTS WITH CUSTOMERS

6 Months Ended

Jun. 30, 2023

Revenue from Contract with Customer [Abstract]

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:


	2023				2022
	Contract Assets		Contract Liabilities		Contract Assets		Contract Liabilities
	(Thousands of Dollars)
Balances as of January 1:
Current portion	$	2,612	$	(17,647)	$	2,336	$	(15,443)
Noncurrent portion	304		(41,405)		504		(46,027)
Total	2,916		(59,052)		2,840		(61,470)

Activity:
Additions	3,782		(45,998)		2,112		(17,692)
Transfer to accounts receivable	(2,856)		—		(2,198)		—
Transfer to revenues	—		33,718		(83)		24,841

Total	926		(12,280)		(169)		7,149

Balances as of June 30:
Current portion	2,703		(27,379)		2,251		(13,555)
Noncurrent portion	1,139		(43,953)		420		(40,766)

Total	$	3,842	$	(71,332)	$	2,671	$	(54,321)

Current contract assets are included in “Prepaid and other current assets” and noncurrent contract assets are included in “Other long-term assets, net” on the consolidated balance sheets. The current portion of contract liabilities is included in “Accrued liabilities” and the noncurrent portion of contract liabilities is included in “Other long-term liabilities” on the consolidated balance sheets.

Remaining Performance Obligations


	Remaining Performance Obligations
	(Thousands of Dollars)
2023 (remaining)	$	204,812
2024	337,666
2025	229,535
2026	163,771
2027	81,059
Thereafter	124,800
Total	$	1,141,643

Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to customer contracts that have fixed pricing and fixed volume terms and conditions, including contracts with payment obligations for minimum volume commitments.

Disaggregation of Revenues

The following table disaggregates our revenues:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines	$	93,186	$	94,010	$	189,789	$	180,134
Refined products and ammonia pipelines	113,515		106,555		230,095		209,114
Total pipeline segment revenues from contracts with customers	206,701		200,565		419,884		389,248



Storage segment:
Throughput terminals	23,839		30,929		51,154		57,370
Storage terminals (excluding lessor revenues)	43,049		47,089		85,065		97,808
Total storage segment revenues from contracts with customers	66,888		78,018		136,219		155,178
Lessor revenues	11,321		10,765		22,647		21,526
Total storage segment revenues	78,209		88,783		158,866		176,704

Fuels marketing segment:
Revenues from contracts with customers	93,426		140,809		193,453		274,069

Consolidation and intersegment eliminations	(2)		—		(2)		(1)

Total revenues	$	378,334	$	430,157	$	772,201	$	840,020

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
-Paragraph 9
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

PARTNERS' EQUITY Narrative 2 (Details)	6 Months Ended
PARTNERS' EQUITY Narrative 2 (Details)	Jun. 30, 2023
Partners' Capital Notes [Abstract]
Percent of available cash distributed	100.00%
Number of days after each quarter-end within which distribution is declared and paid to common unitholders	45

ORGANIZATION AND BASIS OF PRESENTATION Narrative 1 (Details)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business segments	3

SEGMENT INFORMATION Table 2 - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Segment Information
Total assets	$ 4,890,415	$ 4,973,686
Total segment assets
Segment Information
Total assets	4,744,610	4,837,057
Total segment assets \| Pipeline Segment
Segment Information
Total assets	3,304,918	3,360,685
Total segment assets \| Storage Segment
Segment Information
Total assets	1,410,647	1,438,609
Total segment assets \| Fuels Marketing Segment
Segment Information
Total assets	29,045	37,763
Other partnership assets
Segment Information
Total assets	$ 145,805	$ 136,629

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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-Section 50
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+ Details

ORGANIZATION AND BASIS OF PRESENTATION	6 Months Ended
ORGANIZATION AND BASIS OF PRESENTATION	Jun. 30, 2023
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 Delaware limited partnership primarily engaged in the transportation, terminalling and storage of petroleum products and renewable fuels and the transportation of anhydrous ammonia. 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. Our business is managed under the direction of the board of directors of NuStar GP, LLC, the general partner of our general partner, Riverwalk Logistics, L.P., both of which are indirectly wholly owned subsidiaries of ours. 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 Partial Redemptions of Series D Preferred Units. On June 30, 2023, we redeemed an aggregate 5,500,000 of our Series D Cumulative Convertible Preferred Units (Series D Preferred Units), at a price per unit of $31.88, for an aggregate purchase price of $175.3 million. On June 29, 2023, NuStar Energy L.P. notified the holders of our Series D Preferred Units of our intent to exercise our right to redeem an aggregate 2,560,000 of our Series D Preferred Units, at a price per unit of $32.18 for an aggregate purchase price of $82.4 million. This redemption closed on July 31, 2023. Please see Note 6 for additional information on these redemptions. Debt Amendments. On June 30, 2023, we amended our $1.0 billion unsecured revolving credit agreement, mainly to extend the maturity date from April 27, 2025 to January 27, 2027. On June 29, 2023, we amended our $100.0 million receivables financing agreement to extend the scheduled termination date from January 31, 2025 to July 1, 2026. Please refer to Note 4 for more information. 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 six months ended June 30, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023. 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, 2022.

CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY AND MEZZANINE EQUITY - USD ($) $ in Thousands	Total	AOCI [Member]	Preferred Limited Partner [Member]	Common Limited Partner [Member]	Series D Preferred Limited Partner [Member]
Partners' capital - beginning balance at Dec. 31, 2021	$ 981,825	$ (73,978)	$ 756,301	$ 299,502
Temporary equity - beginning balance at Dec. 31, 2021	616,439
Partners' capital and temporary equity - beginning balance at Dec. 31, 2021	1,598,264
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	71,511	0	30,907	8,896
Net income (loss) excluding portion attributable to temporary equity	39,803
Net income, temporary equity					$ 31,708
Other comprehensive income (loss)	41,806	41,806
Cash distributions to partners			(30,907)	(88,164)
Cash distributions to partners, temporary equity					(31,708)
Unit-based compensation	9,591			9,591
Series D Preferred Unit accretion, common	(9,315)			(9,315)
Series D Preferred Unit accretion, preferred					9,315
Series D Preferred Unit accretion, total	0
Other	1	0	0	1
Other, temporary equity					(3)
Other, including temporary equity	(2)
Partners' capital - ending balance at Jun. 30, 2022	944,640	(32,172)	756,301	220,511
Temporary equity - ending balance at Jun. 30, 2022	625,751
Partners' capital and temporary equity - ending balance at Jun. 30, 2022	1,570,391
Partners' capital - beginning balance at Mar. 31, 2022	922,265	(73,046)	756,301	239,010
Temporary equity - beginning balance at Mar. 31, 2022	621,018
Partners' capital and temporary equity - beginning balance at Mar. 31, 2022	1,543,283
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	59,199	0	15,669	27,676
Net income (loss) excluding portion attributable to temporary equity	43,345
Net income, temporary equity					15,854
Other comprehensive income (loss)	40,874	40,874
Cash distributions to partners			(15,669)	(44,123)
Cash distributions to partners, temporary equity					(15,854)
Unit-based compensation	2,681			2,681
Series D Preferred Unit accretion, common	(4,734)			(4,734)
Series D Preferred Unit accretion, preferred					4,734
Series D Preferred Unit accretion, total	0
Other	1	0	0	1
Other, temporary equity					(1)
Other, including temporary equity	0
Partners' capital - ending balance at Jun. 30, 2022	944,640	(32,172)	756,301	220,511
Temporary equity - ending balance at Jun. 30, 2022	625,751
Partners' capital and temporary equity - ending balance at Jun. 30, 2022	1,570,391
Partners' capital - beginning balance at Dec. 31, 2022	902,316	(31,605)	756,301	177,620
Temporary equity - beginning balance at Dec. 31, 2022	446,970
Partners' capital and temporary equity - beginning balance at Dec. 31, 2022	1,349,286
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	152,077	0	43,696	87,218
Net income (loss) excluding portion attributable to temporary equity	130,914
Net income, temporary equity					21,163
Other comprehensive income (loss)	212	212
Cash distributions to partners			(43,696)	(88,724)
Cash distributions to partners, temporary equity					(21,163)
Unit-based compensation	7,390			7,390
Series D Preferred Unit accretion, common	(6,974)			(6,974)
Series D Preferred Unit accretion, preferred					6,974
Series D Preferred Unit accretion, total	0
Series D preferred unit redemption	(255,744)			(32,067)	(223,677)
Other	(54)	0	0	(54)
Other, temporary equity					(3)
Other, including temporary equity	(57)
Partners' capital - ending balance at Jun. 30, 2023	869,317	(31,393)	756,301	144,409
Temporary equity - ending balance at Jun. 30, 2023	230,264
Partners' capital and temporary equity - ending balance at Jun. 30, 2023	1,099,581
Partners' capital - beginning balance at Mar. 31, 2023	932,064	(31,401)	756,301	207,164
Temporary equity - beginning balance at Mar. 31, 2023	450,641
Partners' capital and temporary equity - beginning balance at Mar. 31, 2023	1,382,705
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	46,141	0	22,112	14,015
Net income (loss) excluding portion attributable to temporary equity	36,127
Net income, temporary equity					10,014
Other comprehensive income (loss)	8	8
Cash distributions to partners			(22,112)	(44,362)
Cash distributions to partners, temporary equity					(10,014)
Unit-based compensation	3,006			3,006
Series D Preferred Unit accretion, common	(3,303)			(3,303)
Series D Preferred Unit accretion, preferred					3,303
Series D Preferred Unit accretion, total	0
Series D preferred unit redemption	(255,744)			(32,067)	(223,677)
Other	(44)	0	0	(44)
Other, temporary equity					$ (3)
Other, including temporary equity	(47)
Partners' capital - ending balance at Jun. 30, 2023	869,317	$ (31,393)	$ 756,301	$ 144,409
Temporary equity - ending balance at Jun. 30, 2023	230,264
Partners' capital and temporary equity - ending balance at Jun. 30, 2023	$ 1,099,581

PARTNERS' EQUITY Table 2 - Cash Distributions - Preferred Units - Floating Distribution Rate (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 14, 2023	Jun. 14, 2023	Mar. 14, 2023	Sep. 14, 2022	Jun. 14, 2022	Mar. 14, 2022
Series A Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter		$ 0.73169	$ 0.71889	$ 0.54808	$ 0.47817	$ 0.43606
Series D Preferred Units, accrued distributions		$ 6,629	$ 6,513	$ 4,966	$ 4,332	$ 3,951
Series B Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter		$ 0.66150	$ 0.64871	$ 0.47789
Series D Preferred Units, accrued distributions		$ 10,187	$ 9,990	$ 7,360
Preferred unit distribution, per unit					$ 0.47657	$ 0.47657
Distributions to partners, fixed					$ 7,339	$ 7,339
Series C Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter		$ 0.73881	$ 0.72602
Series D Preferred Units, accrued distributions		$ 5,098	$ 5,010
Preferred unit distribution, per unit				$ 0.56250	$ 0.56250	$ 0.56250
Distributions to partners, fixed				$ 3,881	$ 3,881	$ 3,881
Subsequent Event [Member] \| Series A Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter	$ 0.76715
Series D Preferred Units, accrued distributions	$ 6,950
Subsequent Event [Member] \| Series B Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter	$ 0.69696
Series D Preferred Units, accrued distributions	$ 10,733
Subsequent Event [Member] \| Series C Preferred Limited Partner [Member]
Distribution Made to Preferred Limited Partner [Line Items]
Per unit distribution, variable, per quarter	$ 0.77428
Series D Preferred Units, accrued distributions	$ 5,343

ORGANIZATION AND BASIS OF PRESENTATION (Policies)	6 Months Ended
ORGANIZATION AND BASIS OF PRESENTATION (Policies)	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	Inter-partnership balances and transactions have been eliminated in consolidation.
Basis of Presentation	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.

PARTNERS' EQUITY Table 4 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (31,605)
Ending balance	$ (31,393)		(31,393)
Loss to be reclassified during next 12 months, forward-starting interest rate swaps	(3,300)		(3,300)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	497	$ (40,932)	62	$ (41,761)
Other comprehensive income before reclassification adjustments	249	1,133	684	1,962
Other	0	0	0	0
Other comprehensive income (loss)	249	40,779	684	41,608
Ending balance	746	(153)	746	(153)
Foreign Currency Translation [Member] \| Point Tupper Terminal Disposition
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0	39,646	0	39,646
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(33,865)	(35,957)	(34,380)	(36,486)
Other comprehensive income before reclassification adjustments	0	0	0	0
Other	0	0	0	0
Other comprehensive income (loss)	505	521	1,020	1,050
Ending balance	(33,360)	(35,436)	(33,360)	(35,436)
Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,967	3,843	2,713	4,269
Other comprehensive income before reclassification adjustments	0	0	0	0
Other	(10)	(6)	(19)	(12)
Other comprehensive income (loss)	(746)	(426)	(1,492)	(852)
Ending balance	1,221	3,417	1,221	3,417
Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(31,401)	(73,046)	(31,605)	(73,978)
Other comprehensive income before reclassification adjustments	249	1,133	684	1,962
Other	(10)	(6)	(19)	(12)
Other comprehensive income (loss)	8	40,874	212	41,806
Ending balance	(31,393)	(32,172)	(31,393)	(32,172)
Total [Member] \| Point Tupper Terminal Disposition
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	0	39,646	0	39,646
Other income, net \| Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI			(1,473)	(840)
Other income, net \| Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI			(1,473)	(840)
Interest expense, net \| Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	505	521	1,020	1,050
Interest expense, net \| Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	505	521	$ 1,020	$ 1,050
Pension Plan [Member] \| Other income, net \| Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	(736)	(420)
Pension Plan [Member] \| Other income, net \| Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss reclassified from AOCI	$ (736)	$ (420)

SUPPLEMENTAL CASH FLOW INFORMATION - Table 3 - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 3,813	$ 14,489
Restricted cash	9,056	8,888
Cash, cash equivalents and restricted cash	$ 12,869	$ 23,377	$ 13,145	$ 14,439
Restricted cash, location on consolidated balance sheets [Extensible Enumeration]	Other long-term assets, net	Other long-term assets, net

DEBT Narrative 2 - Receivables Financing Agreement (Details) - Receivables Financing Agreement [Member] - Secured Debt $ in Thousands	Jun. 30, 2023 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100,000
Long-term debt	$ 71,200
Interest rate	6.70%
Debt instrument, collateral amount	$ 108,200

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

DEBT (Tables)

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

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, 2023		December 31, 2022
	(Thousands of Dollars)
Fair value	$	3,250,699	$	3,169,664
Carrying amount	$	3,260,205	$	3,242,289

COMMITMENTS AND CONTINGENCIES	6 Months Ended
COMMITMENTS AND CONTINGENCIES	Jun. 30, 2023
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 $1.3 million and $0.3 million for contingent losses as of June 30, 2023 and December 31, 2022, respectively. 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.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Impairment loss	$ 0	$ 0	$ 0	$ 46,122
General and administrative expenses (excluding depreciation and amortization expense)	31,620	27,909	60,345	54,980
Other depreciation and amortization expense	1,037	1,823	2,592	3,647
Total costs and expenses	275,464	321,098	550,421	672,535
Gain on sale of assets	0	0	41,075	0
Operating income	102,870	109,059	262,855	167,485
Income before income tax expense	47,333	60,130	154,456	72,409
Net income	46,141	59,199	152,077	71,511
Costs and expenses:
Interest expense, net	(58,170)	(50,941)	(115,541)	(100,759)
Other income, net	2,633	2,012	7,142	5,683
Income tax expense	$ 1,192	$ 931	$ 2,379	$ 898
Basic net income (loss) per common unit (Note 8)	$ (0.20)	$ 0.20	$ 0.42	$ (0.02)
Diluted net income (loss) per common unit (Note 8)	$ (0.20)	$ 0.20	$ 0.42	$ (0.02)
Basic weighted-average common units outstanding	110,905,471	110,306,641	110,893,293	110,242,201
Diluted weighted-average common units outstanding	110,905,471	110,306,641	110,893,293	110,242,201
Comprehensive income	$ 46,149	$ 100,073	$ 152,289	$ 113,317
Service [Member]
Revenues:
Total revenues	275,367	278,067	560,633	543,372
Costs and expenses:
Operating expenses (excluding depreciation and amortization expense)	93,363	94,948	182,525	181,350
Depreciation and amortization expense	62,530	62,240	124,584	125,543
Total costs associated with service revenues/Costs associated with product sales	155,893	157,188	307,109	306,893
Product [Member]
Revenues:
Total revenues	102,967	152,090	211,568	296,648
Costs and expenses:
Total costs associated with service revenues/Costs associated with product sales	86,914	134,178	180,375	260,893
Product and Service [Member]
Revenues:
Total revenues	$ 378,334	$ 430,157	$ 772,201	$ 840,020

DEBT Table - Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Fair value, long-term debt, excluding finance leases	$ 3,250,699	$ 3,169,664
Long-term debt, excluding finance leases	$ 3,260,205	$ 3,242,289

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References + Details

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS (Tables)

6 Months Ended

Jun. 30, 2023

Temporary Equity Disclosure [Abstract]

Mandatorily Redeemable Capital Stock

Information related to the redemptions is shown below (thousands of dollars, except date, unit and per unit data):


	June 30, 2023 Redemption		July 31, 2023 Redemption
Notification date	May 25, 2023		June 29, 2023

Units redeemed	5,500,000		2,560,000
Redemption price per unit, including accrued distributions	$	31.88	$	32.18
Redemption price, including accrued distributions	$	175,340	$	82,381
Accrued distributions	825		1,152
Net Redemption Price	$	174,515	$	81,229

Carrying value of units at notification date	$	152,467	$	71,210
Net Redemption Price	174,515		81,229
Loss to common limited partners attributable to redemption	$	(22,048)	$	(10,019)

Loss per common limited partner unit attributable to redemption	$	(0.20)	$	(0.09)

Schedule of Series D Preferred Units [Table Text Block]

Distribution information on our Series D Preferred Units is as follows:


Distribution Period	Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)
June 15, 2023 - September 14, 2023	$	0.872	$	7,598	(a)
March 15, 2023 - June 14, 2023	$	0.682	$	10,315
December 15, 2022 - March 14, 2023	$	0.682	$	11,148

June 15, 2022 - September 14, 2022	$	0.682	$	15,854
March 15, 2022 - June 14, 2022	$	0.682	$	15,854
December 15, 2021 - March 14, 2022	$	0.682	$	15,854

(a) Estimate is based on outstanding units after the July 31, 2023 redemption.

The following is a summary of our Series D Preferred Units issued and outstanding:


	Transaction Date	Price per Unit	Number of Units
Issuance	June 29, 2018	$25.38	15,760,441
Issuance	July 13, 2018	$25.38	7,486,209
Total units issued			23,246,650
Repurchase	November 22, 2022	$32.73	(6,900,000)
Units outstanding as of December 31, 2022			16,346,650
Redemption	June 30, 2023	$31.88	(5,500,000)
Units outstanding as of June 30, 2023			10,846,650

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Table 3 - Issued and Outstanding (Details)	Jun. 30, 2023 $ / shares shares	Nov. 22, 2022 $ / shares shares	Dec. 31, 2022 shares	Jul. 14, 2018 shares	Jul. 13, 2018 $ / shares shares	Jun. 29, 2018 $ / shares shares
Class of Stock [Line Items]
Series D preferred units issued, price per unit \| $ / shares					$ 25.38	$ 25.38
Series D preferred units repurchased, price per unit \| $ / shares		32.73
Series D preferred units issued				23,246,650	7,486,209	15,760,441
Series D preferred units repurchased		(6,900,000)
Series D preferred units outstanding	8,286,650		16,346,650
Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Series D preferred units redeemed, redemption price per unit, including accrued distributions \| $ / shares	31.88
Series D Preferred Units redeemed, units	(5,500,000)
Preferred units outstanding	10,846,650

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 3 - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Total revenues	$ (2)	$ 0	$ (2)	$ (1)
Pipeline Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	206,701	200,565	419,884	389,248
Pipeline Segment \| Crude Oil Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	93,186	94,010	189,789	180,134
Pipeline Segment \| Refined Products and Ammonia Pipelines [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	113,515	106,555	230,095	209,114
Storage Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	66,888	78,018	136,219	155,178
Lessor revenues	11,321	10,765	22,647	21,526
Total revenues	78,209	88,783	158,866	176,704
Storage Segment \| Throughput Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	23,839	30,929	51,154	57,370
Storage Segment \| Storage Terminal [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	43,049	47,089	85,065	97,808
Fuels Marketing Segment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	93,426	140,809	193,453	274,069
Operating Segments, Net of Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Total revenues	$ 378,334	$ 430,157	$ 772,201	$ 840,020

DEBT Narrative 1 - Revolving Credit Agreement (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2023 USD ($)
Maximum [Member]
Debt Instrument [Line Items]
Maximum consolidated debt coverage ratio (as defined in the Revolving Credit Agreement)	5.00
Minimum [Member]
Debt Instrument [Line Items]
Minimum consolidated interest coverage ratio (as defined in the Revolving Credit Agreement)	1.75
Revolving Credit Agreement [Member] \| Unsecured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000,000
Line of credit facility, requirement, pro forma amount	150,000
Current remaining borrowing capacity	750,400
Long-term debt	245,000
Letters of credit outstanding, amount	$ 4,600
Line of credit facility, weighted-average interest rate	7.70%

ORGANIZATION AND BASIS OF PRESENTATION Narrative 2 Series D Preferred Units (Details) - Series D Preferred Limited Partner [Member] $ in Thousands	Jul. 31, 2023 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares
Class of Stock [Line Items]
Series D Preferred Units redeemed, units \| shares		5,500,000
Series D preferred units redeemed, redemption price per unit, including accrued distributions \| $ / shares		31.88
Series D Preferred Units redeemed, aggregate purchase price, including accrued distributions \| $		$ 175,340
Subsequent Event [Member]
Class of Stock [Line Items]
Series D Preferred Units redeemed, units \| shares	2,560,000
Series D preferred units redeemed, redemption price per unit, including accrued distributions \| $ / shares	32.18
Series D Preferred Units redeemed, aggregate purchase price, including accrued distributions \| $	$ 82,381

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

6 Months Ended

Jun. 30, 2023

Supplemental Cash Flow Information [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,
	2023		2022
	(Thousands of Dollars)
Decrease (increase) in current assets:
Accounts receivable	$	12,356	$	(21,262)

Inventories	4,920		1,439

Other current assets	(3,508)		705
Increase (decrease) in current liabilities:
Accounts payable	(2,427)		5,082

Accrued interest payable	869		567
Accrued liabilities	(8,300)		(14,448)
Taxes other than income tax	(2,125)		(3,023)

Changes in current assets and current liabilities	$	1,785	$	(30,940)

Schedule of Supplemental Cash Flow Information [Table Text Block]

Other supplemental cash flow information is as follows:


	Six Months Ended June 30,
	2023		2022
	(Thousands of Dollars)
Cash paid for interest, net of amount capitalized	$	110,195	$	95,112
Cash paid for income taxes, net of tax refunds received	$	2,842	$	3,646
Right-of-use assets obtained in exchange for operating lease liabilities	$	82,372	$	2,990
Right-of-use assets obtained in exchange for finance lease liabilities	$	1,818	$	1,342

Schedule of Cash and Cash Equivalents [Table Text Block]

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


	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Cash and cash equivalents	$	3,813	$	14,489

Other long-term assets, net	9,056		8,888
Cash, cash equivalents and restricted cash	$	12,869	$	23,377

DISPOSITIONS Narrative 2 Operating Lease Information (Details)	Mar. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Operating lease, weighted average discount rate, percent	6.10%

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 3,813	$ 14,489
Accounts receivable, net	125,116	149,971
Inventories	10,477	15,397
Prepaid and other current assets	27,548	24,067
Total current assets	166,954	203,924
Property, plant and equipment, at cost	5,693,440	5,733,685
Accumulated depreciation and amortization	(2,397,938)	(2,330,602)
Property, plant and equipment, net	3,295,502	3,403,083
Intangible assets, net	494,880	513,696
Goodwill	732,356	732,356
Other long-term assets, net	200,723	120,627
Total assets	4,890,415	4,973,686
Current liabilities:
Accounts payable	64,938	67,765
Current portion of finance leases	4,677	4,416
Accrued interest payable	38,476	37,607
Accrued liabilities	66,168	76,072
Taxes other than income tax	7,695	10,607
Total current liabilities	181,954	196,467
Long-term debt, less current portion of finance leases	3,310,561	3,293,415
Deferred income tax liability	3,262	3,219
Mandatorily redeemable Series D preferred units (Note 6)	81,229	0
Other long-term liabilities	213,828	131,299
Total liabilities	3,790,834	3,624,400
Commitments and contingencies (Note 5)
Series D preferred limited partners (Note 6)	230,264	446,970
Partners’ equity (Note 7):
Common limited partners (110,906,500 and 110,818,718 units outstanding as of June 30, 2023 and December 31, 2022, respectively)	144,409	177,620
Accumulated other comprehensive loss	(31,393)	(31,605)
Total partners’ equity	869,317	902,316
Total liabilities, mezzanine equity and partners’ equity	4,890,415	4,973,686
Series A Preferred Limited Partner [Member]
Partners’ equity (Note 7):
Preferred limited partners	218,307	218,307
Series B Preferred Limited Partner [Member]
Partners’ equity (Note 7):
Preferred limited partners	371,476	371,476
Series C Preferred Limited Partner [Member]
Partners’ equity (Note 7):
Preferred limited partners	$ 166,518	$ 166,518

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

6 Months Ended

Jun. 30, 2023

Temporary Equity Disclosure [Abstract]

SERIES D CUMULATIVE COVERTIBLE PREFERRED UNITS

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS

Partial Redemptions

On May 25, 2023 and June 29, 2023, NuStar Energy L.P. notified the holders of our Series D Preferred Units of our intent to exercise our right to redeem a portion of our outstanding Series D Preferred Units. The redemptions closed on June 30, 2023 and July 31, 2023, respectively, and were primarily funded with borrowings under our Revolving Credit Agreement, which had been partially paid down in the first quarter of 2023 with proceeds from the Sale-Leaseback Transaction. On the respective notification dates, those Series D Preferred Units became mandatorily redeemable; therefore, we reclassified those Series D Preferred Units from mezzanine equity to liability-classified “Mandatorily redeemable Series D preferred units” valued at the redemption price, excluding accrued distributions (Net Redemption Price). As of June 30, 2023, we presented the liability-classified Series D Preferred Units as non-current on our balance sheet as we had the intent and ability to refinance them on a long-term basis using our Revolving Credit Agreement. We recorded the difference between the carrying value of those Series D Preferred Units prior to reclassification and the Net Redemption Price as a deemed distribution, which reduced our common equity and reduced net income attributable to common units in the calculation of basic and diluted net income (loss) per common unit. At each closing, we accounted for the redemptions as extinguishments of debt. Distributions accrued for redeemed units from the notification dates to the redemption dates totaled $1.7 million for the three and six months ended June 30, 2023, and are reported in “Interest expense, net” on the condensed consolidated statements of comprehensive income.

Information related to the redemptions is shown below (thousands of dollars, except date, unit and per unit data):


	June 30, 2023 Redemption		July 31, 2023 Redemption
Notification date	May 25, 2023		June 29, 2023

Units redeemed	5,500,000		2,560,000
Redemption price per unit, including accrued distributions	$	31.88	$	32.18
Redemption price, including accrued distributions	$	175,340	$	82,381
Accrued distributions	825		1,152
Net Redemption Price	$	174,515	$	81,229

Carrying value of units at notification date	$	152,467	$	71,210
Net Redemption Price	174,515		81,229
Loss to common limited partners attributable to redemption	$	(22,048)	$	(10,019)

Loss per common limited partner unit attributable to redemption	$	(0.20)	$	(0.09)

Distributions

We allocate net income to our Series D Preferred Units equal to the amount of distributions earned during the period. Distributions on the 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 rates on the Series D Preferred Units are as follows: (i) 9.75% per annum ($0.619 per unit per distribution period) for the first two years; (ii) 10.75% per annum ($0.682 per unit per distribution period) for years three through five; and (iii) the greater of 13.75% per annum ($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.

The distribution rate on our Series D Preferred Units increased on June 15, 2023, to the greater of 13.75% per annum ($0.872 per unit per distribution period) or the distribution per common unit. Total distribution excludes amounts reported in “Interest expense, net” as described above under “Partial Redemptions of Series D Preferred Units.” Distribution information on our Series D Preferred Units is as follows:


Distribution Period	Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)
June 15, 2023 - September 14, 2023	$	0.872	$	7,598	(a)
March 15, 2023 - June 14, 2023	$	0.682	$	10,315
December 15, 2022 - March 14, 2023	$	0.682	$	11,148

June 15, 2022 - September 14, 2022	$	0.682	$	15,854
March 15, 2022 - June 14, 2022	$	0.682	$	15,854
December 15, 2021 - March 14, 2022	$	0.682	$	15,854

(a) Estimate is based on outstanding units after the July 31, 2023 redemption.

In July 2023, our board of directors declared distributions with respect to the Series D Preferred Units to be paid on September 15, 2023.

Units Issued and Outstanding

The following is a summary of our Series D Preferred Units issued and outstanding:


	Transaction Date	Price per Unit	Number of Units
Issuance	June 29, 2018	$25.38	15,760,441
Issuance	July 13, 2018	$25.38	7,486,209
Total units issued			23,246,650
Repurchase	November 22, 2022	$32.73	(6,900,000)
Units outstanding as of December 31, 2022			16,346,650
Redemption	June 30, 2023	$31.88	(5,500,000)
Units outstanding as of June 30, 2023			10,846,650

As of June 30, 2023, we reported 2,560,000 of the Series D Preferred Units outstanding in “Mandatorily redeemable Series D preferred units” and 8,286,650 Series D Preferred Units in “Mezzanine Equity” on the consolidated balance sheets. After the July 31, 2023 redemption, 8,286,650 Series D Preferred Units remain outstanding.

PARTNERS' EQUITY Table 1 - Cash Distributions - Preferred Units (Details) - $ / shares				6 Months Ended
	Nov. 30, 2017	Apr. 28, 2017	Nov. 25, 2016	Jun. 30, 2023	Dec. 31, 2022
Series A Preferred Limited Partner [Member]
Preferred Units [Line Items]
Preferred units issued			9,060,000
Preferred units outstanding				9,060,000	9,060,000
Series A Preferred Limited Partner [Member] \| December 15, 2021 and Thereafter
Preferred Units [Line Items]
Preferred units, liquidation preference, per unit				$ 25.00
Series A Preferred Limited Partner [Member] \| December 15, 2021 and Thereafter
Preferred Units [Line Items]
Preferred units, distribution payment rate, basis spread				6.766%
Series B Preferred Limited Partner [Member]
Preferred Units [Line Items]
Preferred units issued		15,400,000
Preferred units outstanding				15,400,000	15,400,000
Series B Preferred Limited Partner [Member] \| June 15, 2022 and Thereafter
Preferred Units [Line Items]
Preferred units, liquidation preference, per unit				$ 25.00
Series B Preferred Limited Partner [Member] \| June 15, 2022 and Thereafter
Preferred Units [Line Items]
Preferred units, distribution payment rate, basis spread				5.643%
Series C Preferred Limited Partner [Member]
Preferred Units [Line Items]
Preferred units issued	6,900,000
Preferred units outstanding				6,900,000	6,900,000
Series C Preferred Limited Partner [Member] \| December 15, 2022 and Thereafter
Preferred Units [Line Items]
Preferred units, liquidation preference, per unit				$ 25.00
Series C Preferred Limited Partner [Member] \| December 15, 2022 and Thereafter
Preferred Units [Line Items]
Preferred units, distribution payment rate, basis spread				6.88%

SUPPLEMENTAL CASH FLOW INFORMATION - Table 1 - Changes in Current Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Supplemental Cash Flow Information [Abstract]
Decrease (increase) in accounts receivable	$ 12,356	$ (21,262)
Decrease (increase) in inventories	4,920	1,439
Decrease (increase) in other currrent assets	(3,508)	705
Increase (decrease) in accounts payable	(2,427)	5,082
Increase (decrease) in accrued interest payable	869	567
Increase (decrease) in accrued liabilities	(8,300)	(14,448)
Increase (decrease) in taxes other than income tax	(2,125)	(3,023)
Changes in current assets and current liabilities	$ 1,785	$ (30,940)

SUPPLEMENTAL CASH FLOW INFORMATION (Policies)	6 Months Ended
SUPPLEMENTAL CASH FLOW INFORMATION (Policies)	Jun. 30, 2023
Supplemental Cash Flow Information [Abstract]
Restricted Cash	Restricted cash, representing legally restricted funds that are unavailable for general use, is included in "Other long-term assets, net" on the consolidated balance sheets.

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative 2 - Distributions (Details) - Series D Preferred Limited Partner [Member] - $ / shares	3 Months Ended					6 Months Ended
	Jun. 14, 2023	Mar. 14, 2023	Sep. 14, 2022	Jun. 14, 2022	Mar. 14, 2022	Jun. 30, 2023
Class of Stock [Line Items]
Cash distributions per unit applicable to limited partners	$ 0.682	$ 0.682	$ 0.682	$ 0.682	$ 0.682
Series D preferred units, required amount of per unit cash dividends to permit dividend paid in kind						$ 0.635
Preferred Stock, Distributions, Period - June 29, 2018 to June 14, 2020 [Member]
Class of Stock [Line Items]
Preferred units distribution percentage, per annum						9.75%
Cash distributions per unit applicable to limited partners						$ 0.619
Preferred Stock, Distributions, Period - June 15, 2020 to June 14, 2023
Class of Stock [Line Items]
Preferred units distribution percentage, per annum						10.75%
Cash distributions per unit applicable to limited partners						$ 0.682
Minimum [Member] \| Preferred Stock, Distributions, Period - June 15, 2023 and thereafter [Member]
Class of Stock [Line Items]
Preferred units distribution percentage, per annum						13.75%
Cash distributions per unit applicable to limited partners						$ 0.872

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2023

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,
	2023		2022		2023		2022
	(Thousands of Dollars)
Revenues:

Pipeline	$	206,701	$	200,565	$	419,884	$	389,248






Storage	78,209		88,783		158,866		176,704

Fuels marketing	93,426		140,809		193,453		274,069



Consolidation and intersegment eliminations	(2)		—		(2)		(1)
Total revenues	$	378,334	$	430,157	$	772,201	$	840,020

Operating income:
Pipeline	$	107,804	$	100,953	$	227,662	$	196,705
Storage	21,213		31,207		43,979		16,232
Fuels marketing	6,510		6,631		13,076		13,175

Total segment operating income	135,527		138,791		284,717		226,112
Gain on sale of assets	—		—		41,075		—
General and administrative expenses	31,620		27,909		60,345		54,980
Other depreciation and amortization expense	1,037		1,823		2,592		3,647
Total operating income	$	102,870	$	109,059	$	262,855	$	167,485

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

Total assets by reportable segment were as follows:


	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Pipeline	$	3,304,918	$	3,360,685
Storage	1,410,647		1,438,609
Fuels marketing	29,045		37,763
Total segment assets	4,744,610		4,837,057
Other partnership assets	145,805		136,629
Total consolidated assets	$	4,890,415	$	4,973,686

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative 1 (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Interest expense, net
Temporary Equity [Line Items]
Series D Preferred Units, distributions on mandatorily redeemable units	$ 1,700	$ 1,700

NET INCOME (LOSS) PER COMMON UNIT

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

NET INCOME (LOSS) PER COMMON UNIT

Basic and diluted 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 and, beginning on June 15, 2023, the Series D Preferred Units. We compute basic net income (loss) per common unit by dividing net income (loss) attributable to common units by the weighted-average number of common units outstanding during the period. We compute diluted net income (loss) per common unit 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 include the Series D Preferred Units.

The Series D Preferred Units contain certain unitholder conversion and redemption features, and we use the if-converted method to calculate the dilutive effect of the conversion or redemption feature that is most advantageous to our Series D preferred unitholders. The effect of the assumed conversion or redemption of the Series D Preferred Units outstanding was antidilutive for each of the three and six months ended June 30, 2023 and 2022; therefore, we did not include such conversion in the computation of diluted net (loss) income per common unit.

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


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income	$	46,141	$	59,199	$	152,077	$	71,511
Distributions to preferred limited partners	(32,126)		(31,523)		(64,859)		(62,615)
Distributions to common limited partners	(44,363)		(44,128)		(88,759)		(88,293)
Distribution equivalent rights to restricted units	(667)		(617)		(1,339)		(1,250)
Distributions in excess of income	$	(31,015)	$	(17,069)	$	(2,880)	$	(80,647)

Distributions to common limited partners	$	44,363	$	44,128	$	88,759	$	88,293
Allocation of distributions in excess of income to common limited partners	(31,015)		(17,069)		(2,880)		(80,647)
Series D Preferred Unit accretion	(3,303)		(4,734)		(6,974)		(9,315)
Series D Preferred Unit redemption	(32,067)		—		(32,067)		—
Net (loss) income attributable to common units	$	(22,022)	$	22,325	$	46,838	$	(1,669)


Basic and diluted weighted-average common units outstanding	110,905,471		110,306,641		110,893,293		110,242,201



Basic and diluted net (loss) income per common unit	$	(0.20)	$	0.20	$	0.42	$	(0.02)

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Table 1 - Unit redemptions (Details) $ in Thousands					1 Months Ended	2 Months Ended	3 Months Ended								6 Months Ended
	Jul. 31, 2023 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 29, 2023 USD ($) $ / shares	May 25, 2023 USD ($) $ / shares	Jun. 30, 2023 USD ($) $ / shares	Jul. 30, 2023 USD ($)	Sep. 14, 2023 USD ($)	Jun. 30, 2023 USD ($) $ / shares	Jun. 14, 2023 USD ($)	Mar. 14, 2023 USD ($)	Sep. 14, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 14, 2022 USD ($)	Mar. 14, 2022 USD ($)	Jun. 30, 2023 USD ($) $ / shares	Jun. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Temporary Equity [Line Items]
Series D Preferred Units, carrying value of units at notification date		$ 230,264			$ 230,264			$ 230,264				$ 625,751			$ 230,264	$ 625,751	$ 450,641	$ 446,970	$ 621,018	$ 616,439
Deemed distribution/Loss to common limited partners attributable to Series D Preferred Unit redemption								$ (32,067)				0			$ (32,067)	0
Preferred Stock Redeemed June 30, 2023
Temporary Equity [Line Items]
Series D Preferred Units, carrying value of units at notification date				$ 152,467
Deemed distribution/Loss to common limited partners attributable to Series D Preferred Unit redemption				$ (22,048)
Loss per common limited partner unit attributable to redemption of Series D preferred units \| $ / shares				$ (0.20)
Preferred Stock Redeemed July 31, 2023
Temporary Equity [Line Items]
Series D Preferred Units, carrying value of units at notification date			$ 71,210
Deemed distribution/Loss to common limited partners attributable to Series D Preferred Unit redemption			$ (10,019)
Loss per common limited partner unit attributable to redemption of Series D preferred units \| $ / shares			$ (0.09)
Series D Preferred Limited Partner [Member]
Temporary Equity [Line Items]
Series D Preferred Units redeemed, units \| shares		5,500,000
Series D preferred units redeemed, redemption price per unit, including accrued distributions \| $ / shares		31.88			31.88			31.88							31.88
Series D Preferred Units redeemed, aggregate purchase price, including accrued distributions		$ 175,340
Series D Preferred Units, accrued distributions								$ 10,014	$ 10,315	$ 11,148	$ 15,854	$ 15,854	$ 15,854	$ 15,854	$ 21,163	$ 31,708
Series D Preferred Limited Partner [Member] \| Preferred Stock Redeemed June 30, 2023
Temporary Equity [Line Items]
Series D Preferred Units, accrued distributions					$ 825
Net Redemption Price		$ 174,515
Series D Preferred Limited Partner [Member] \| Subsequent Event [Member]
Temporary Equity [Line Items]
Series D Preferred Units redeemed, units \| shares	2,560,000
Series D preferred units redeemed, redemption price per unit, including accrued distributions \| $ / shares	32.18
Series D Preferred Units redeemed, aggregate purchase price, including accrued distributions	$ 82,381
Series D Preferred Units, accrued distributions							$ 7,598
Series D Preferred Limited Partner [Member] \| Subsequent Event [Member] \| Preferred Stock Redeemed July 31, 2023
Temporary Equity [Line Items]
Series D Preferred Units, accrued distributions						$ 1,152
Net Redemption Price	$ 81,229

REVENUE FROM CONTRACTS WITH CUSTOMERS Table 1 - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Contract assets
Total	$ 3,842	$ 2,671	$ 2,916	$ 2,840
Additions	3,782	2,112
Transfer to accounts receivable	(2,856)	(2,198)
Transfer to revenues, contract assets	0	(83)
Total activity	926	(169)
Contract liabilities
Total	(71,332)	(54,321)	(59,052)	(61,470)
Additions	(45,998)	(17,692)
Transfer to revenues, contract liabilities	33,718	24,841
Total activity	(12,280)	7,149
Prepaid and other current assets
Contract assets
Current portion	2,703	2,251	2,612	2,336
Accrued liabilities
Contract liabilities
Current portion	(27,379)	(13,555)	(17,647)	(15,443)
Other long-term assets, net
Contract assets
Noncurrent portion	1,139	420	304	504
Other long-term liabilities
Contract liabilities
Noncurrent portion	$ (43,953)	$ (40,766)	$ (41,405)	$ (46,027)

DISPOSITIONS

6 Months Ended

Jun. 30, 2023

Discontinued Operations and Disposal Groups [Abstract]

DISPOSITIONS

Sale-Leaseback Transaction

On March 21, 2023, we sold our corporate headquarters facility and approximately 24 acres of underlying land located in San Antonio, Texas (the Corporate Headquarters) for an aggregate cash sales price of approximately $103.0 million and immediately leased back the Corporate Headquarters for an initial term of twenty years, with two renewal options of ten years each (the Sale-Leaseback Transaction). Upon closing of the sale in the first quarter of 2023, the Sale-Leaseback Transaction qualified as a completed sale, and we recognized a gain of $41.1 million, which is presented in “Gain on sale of assets” on the condensed consolidated statements of comprehensive income. We entered into the Sale-leaseback Transaction in order to monetize the Corporate Headquarters and used the proceeds to repay borrowings on our revolving credit agreement.

Pursuant to the lease agreement, rent for the initial term starts at $6.4 million per year and increases annually by 2.5%. At inception of the lease, right-of-use assets and lease liabilities associated with the Sale-Leaseback Transaction assumed a reasonably certain term of 20 years and were included in our consolidated balance sheet as follows (thousands of dollars):


Operating lease right-of-use assets:
Other long-term assets, net	$	82,230


Operating lease liabilities:
Accrued liabilities	$	710
Other long-term liabilities	81,498
Total operating lease liabilities	$	82,208

Following our entrance into the Sale-Leaseback Transaction, the weighted-average discount rate for our operating leases was 6.1%.

Point Tupper Terminal Disposition

On April 29, 2022, we sold the equity interests in our wholly owned subsidiaries that owned our Point Tupper terminal facility in Nova Scotia, Canada (the Point Tupper Terminal Operations) to EverWind Fuels for $60.0 million. The terminal facility had a storage capacity of 7.8 million barrels and was included in the storage segment. We used the sales proceeds to reduce debt and improve our debt metrics.

During the first quarter of 2022, we determined the Point Tupper Terminal Operations met the criteria to be classified as held for sale. We compared the carrying value of the Point Tupper Terminal Operations, which included $42.2 million in cumulative foreign currency translation losses accumulated since our acquisition of the Point Tupper terminal facility in 2005, to its fair value less costs to sell, and we recognized a pre-tax impairment loss of $46.1 million in the first quarter of 2022, which is presented in "Impairment loss" on the condensed consolidated statements of comprehensive income. We believe that the sales price of $60.0 million provided a reasonable indication of the fair value of the Point Tupper Terminal Operations as it represented an exit price in an orderly transaction between market participants. The sales price was a quoted price for identical assets and liabilities in a market that was not active and, thus, our fair value estimate fell within Level 2 of the fair value hierarchy. Upon closing in the second quarter of 2022, we released $39.6 million of foreign currency translation losses from accumulated other comprehensive loss and finalized our sales price, resulting in a gain of $1.6 million, which was presented in “Other income, net” on the condensed consolidated statement of comprehensive income for the period.

DISPOSITIONS (Tables)

6 Months Ended

Jun. 30, 2023

Discontinued Operations and Disposal Groups [Abstract]

Sale leaseback transactions

At inception of the lease, right-of-use assets and lease liabilities associated with the Sale-Leaseback Transaction assumed a reasonably certain term of 20 years and were included in our consolidated balance sheet as follows (thousands of dollars):


Operating lease right-of-use assets:
Other long-term assets, net	$	82,230


Operating lease liabilities:
Accrued liabilities	$	710
Other long-term liabilities	81,498
Total operating lease liabilities	$	82,208

DISPOSITIONS Narrative 3 - Point Tupper Terminal Disposition (Details) $ in Thousands, bbl in Millions		3 Months Ended			6 Months Ended
	Apr. 29, 2022 USD ($) bbl	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Segment Information
Proceeds from sale of business	$ 60,000
Foreign currency translation losses				$ 42,200
Impairment loss		$ 0	$ 0		$ 0	$ 46,122
Foreign currency translation losses released			39,600
Gain on sale			$ 1,600
Gain on sale, location on consolidated statement of comprehensive income (loss) [Extensible Enumeration]						Other income, net
Impairment loss
Segment Information
Impairment loss				$ 46,100
Storage Segment
Segment Information
Storage capacity sold (barrels) \| bbl	7.8

NET INCOME (LOSS) PER COMMON UNIT (Policies)	6 Months Ended
NET INCOME (LOSS) PER COMMON UNIT (Policies)	Jun. 30, 2023
Earnings Per Share [Abstract]
Basic and Diluted Net Income (Loss) per Common Unit	Basic and diluted 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 and, beginning on June 15, 2023, the Series D Preferred Units. We compute basic net income (loss) per common unit by dividing net income (loss) attributable to common units by the weighted-average number of common units outstanding during the period. We compute diluted net income (loss) per common unit 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 include the Series D Preferred Units. The Series D Preferred Units contain certain unitholder conversion and redemption features, and we use the if-converted method to calculate the dilutive effect of the conversion or redemption feature that is most advantageous to our Series D preferred unitholders. The effect of the assumed conversion or redemption of the Series D Preferred Units outstanding was antidilutive for each of the three and six months ended June 30, 2023 and 2022; therefore, we did not include such conversion in the computation of diluted net (loss) income per common unit.

NET INCOME (LOSS) PER COMMON UNIT (Tables)

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Schedule of Net Income (Loss) Per Common Unit

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


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars, Except Unit and Per Unit Data)
Net income	$	46,141	$	59,199	$	152,077	$	71,511
Distributions to preferred limited partners	(32,126)		(31,523)		(64,859)		(62,615)
Distributions to common limited partners	(44,363)		(44,128)		(88,759)		(88,293)
Distribution equivalent rights to restricted units	(667)		(617)		(1,339)		(1,250)
Distributions in excess of income	$	(31,015)	$	(17,069)	$	(2,880)	$	(80,647)

Distributions to common limited partners	$	44,363	$	44,128	$	88,759	$	88,293
Allocation of distributions in excess of income to common limited partners	(31,015)		(17,069)		(2,880)		(80,647)
Series D Preferred Unit accretion	(3,303)		(4,734)		(6,974)		(9,315)
Series D Preferred Unit redemption	(32,067)		—		(32,067)		—
Net (loss) income attributable to common units	$	(22,022)	$	22,325	$	46,838	$	(1,669)


Basic and diluted weighted-average common units outstanding	110,905,471		110,306,641		110,893,293		110,242,201



Basic and diluted net (loss) income per common unit	$	(0.20)	$	0.20	$	0.42	$	(0.02)

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows from Operating Activities:
Net income (loss)	$ 152,077	$ 71,511
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	127,176	129,190
Amortization of unit-based compensation	7,302	6,746
Amortization of debt related items	5,224	5,085
Gain on sale of assets	(41,075)	0
Impairment loss	0	46,122
Changes in current assets and current liabilities (Note 9)	1,785	(30,940)
Decrease in other long-term assets, net	5,692	6,626
Increase (decrease) in other long-term liabilities	796	(6,218)
Other, net	(6,672)	(5,835)
Net cash provided by operating activities	252,305	222,287
Cash Flows from Investing Activities:
Capital expenditures	(54,532)	(71,425)
Change in accounts payable related to capital expenditures	1,450	(8,716)
Proceeds from insurance recoveries	12,395	5,805
Proceeds from sale or disposition of assets, net of transaction costs	102,769	59,531
Net cash provided by (used in) investing activities	62,082	(14,805)
Cash Flows from Financing Activities:
Proceeds from long-term debt borrowings	443,000	480,400
Long-term debt repayments	(427,700)	(528,100)
Redemption of Series D preferred units	(174,515)	0
Distributions to preferred unitholders	(64,890)	(62,432)
Distributions to common unitholders	(88,724)	(88,164)
Other, net	(12,376)	(11,243)
Net cash used in financing activities	(325,205)	(209,539)
Effect of foreign exchange rate changes on cash	310	763
Net decrease in cash, cash equivalents and restricted cash	(10,508)	(1,294)
Cash, cash equivalents and restricted cash as of the beginning of the period	23,377	14,439
Cash, cash equivalents and restricted cash as of the end of the period	$ 12,869	$ 13,145

PARTNERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2023

Distribution Made to Preferred Limited Partner [Line Items]

Schedule of Preferred Units

Information on our Series A, B and C Preferred Units is shown below:

Units

Units Issued and Outstanding as of June 30, 2023

Optional Redemption Date/Date When Distribution Rate Became Floating

Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit)

Series A Preferred Units

9,060,000

December 15, 2021

Three-month LIBOR plus 6.766%

Series B Preferred Units

15,400,000

June 15, 2022

Three-month LIBOR plus 5.643%

Series C Preferred Units

6,900,000

December 15, 2022

Three-month LIBOR plus 6.88%

Distribution information on our Series A, B and C Preferred Units is as follows:


	Series A Preferred Units				Series B Preferred Units				Series C Preferred Units
Distribution Period	Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution		Distribution Rate per Unit		Total Distribution
			(Thousands of Dollars)				(Thousands of Dollars)				(Thousands of Dollars)

June 15, 2023 - September 14, 2023 (a)	$	0.76715	$	6,950	$	0.69696	$	10,733	$	0.77428	$	5,343
March 15, 2023 - June 14, 2023	$	0.73169	$	6,629	$	0.66150	$	10,187	$	0.73881	$	5,098
December 15, 2022 - March 14, 2023	$	0.71889	$	6,513	$	0.64871	$	9,990	$	0.72602	$	5,010

June 15, 2022 - September 14, 2022	$	0.54808	$	4,966	$	0.47789	$	7,360	$	0.56250	$	3,881
March 15, 2022 - June 14, 2022	$	0.47817	$	4,332	$	0.47657	$	7,339	$	0.56250	$	3,881
December 15, 2021 - March 14, 2022	$	0.43606	$	3,951	$	0.47657	$	7,339	$	0.56250	$	3,881

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

The following table summarizes information about cash distributions to our common limited partners applicable to the period in which the distributions were earned:


Quarter Ended	Cash Distributions Per Unit		Total Cash Distributions		Record Date	Payment Date
			(Thousands of Dollars)

June 30, 2023	$	0.40	$	44,363	August 8, 2023	August 14, 2023
March 31, 2023	$	0.40	$	44,396	May 8, 2023	May 12, 2023
December 31, 2022	$	0.40	$	44,328	February 8, 2023	February 14, 2023

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

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


	Three Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of April 1	$	497	$	(33,865)	$	1,967	$	(31,401)	$	(40,932)	$	(35,957)	$	3,843	$	(73,046)
Other comprehensive income before reclassification adjustments	249		—		—		249		1,133		—		—		1,133
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(736)		(736)		—		—		(420)		(420)
Net loss on cash flow hedges reclassified into interest expense, net	—		505		—		505		—		521		—		521
Other	—		—		(10)		(10)		—		—		(6)		(6)
Other comprehensive income (loss)	249		505		(746)		8		40,779		521		(426)		40,874
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)


	Six Months Ended June 30,
	2023								2022
	Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total		Foreign Currency Translation		Cash Flow Hedges		Pension and Other Postretirement Benefits		Total
	(Thousands of Dollars)
Balance as of January 1	$	62	$	(34,380)	$	2,713	$	(31,605)	$	(41,761)	$	(36,486)	$	4,269	$	(73,978)
Other comprehensive income before reclassification adjustments	684		—		—		684		1,962		—		—		1,962
Sale of Point Tupper Terminal Operations reclassified into net income (Note 2)	—		—		—		—		39,646		—		—		39,646
Net gain on pension costs reclassified into other income, net	—		—		(1,473)		(1,473)		—		—		(840)		(840)
Net loss on cash flow hedges reclassified into interest expense, net	—		1,020		—		1,020		—		1,050		—		1,050
Other	—		—		(19)		(19)		—		—		(12)		(12)
Other comprehensive income (loss)	684		1,020		(1,492)		212		41,608		1,050		(852)		41,806
Balance as of June 30	$	746	$	(33,360)	$	1,221	$	(31,393)	$	(153)	$	(35,436)	$	3,417	$	(32,172)

swaps.

DEI Document - shares	6 Months Ended
DEI Document - shares	Jun. 30, 2023	Jul. 31, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
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		110,907,171
Entity Central Index Key	0001110805
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
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	8.50% 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	7.625% 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	9.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol	NSprC
Security Exchange Name	NYSE

CONSOLIDATED BALANCE SHEETS (parenthetical) - shares	Jun. 30, 2023	Dec. 31, 2022
Limited partners common units outstanding	110,906,500	110,818,718
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

DISPOSITIONS Table 1 - Sale Leaseback Transaction (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Sale Leaseback Transaction [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other long-term assets, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities
Corporate headquarters facility and underlying land
Sale Leaseback Transaction [Line Items]
Operating lease, right-of-use assets	$ 82,230
Operating lease, liabilities, current	710
Operating lease, liabilities, long-term	81,498
Operating lease, liabilities, total	$ 82,208

SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative 3 (Details) - shares	Jul. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Series D preferred units outstanding		8,286,650	16,346,650
Subsequent Event [Member]
Class of Stock [Line Items]
Series D preferred units outstanding	8,286,650
Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units outstanding		10,846,650
Mandatorily Redeemable Preferred Stock \| Series D Preferred Limited Partner [Member]
Class of Stock [Line Items]
Preferred units outstanding		2,560,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

PARTNERS' EQUITY Table 3 - Cash Distributions - Common Limited Partners (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Partners' Capital Notes [Abstract]
Common limited partners' distribution, per unit	$ 0.40	$ 0.40	$ 0.40
Common limited partners' distribution	$ 44,363	$ 44,396	$ 44,328	$ 44,128	$ 88,759	$ 88,293

SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

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.

Results of operations for the reportable segments were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(Thousands of Dollars)
Revenues:

Pipeline	$	206,701	$	200,565	$	419,884	$	389,248






Storage	78,209		88,783		158,866		176,704

Fuels marketing	93,426		140,809		193,453		274,069



Consolidation and intersegment eliminations	(2)		—		(2)		(1)
Total revenues	$	378,334	$	430,157	$	772,201	$	840,020

Operating income:
Pipeline	$	107,804	$	100,953	$	227,662	$	196,705
Storage	21,213		31,207		43,979		16,232
Fuels marketing	6,510		6,631		13,076		13,175

Total segment operating income	135,527		138,791		284,717		226,112
Gain on sale of assets	—		—		41,075		—
General and administrative expenses	31,620		27,909		60,345		54,980
Other depreciation and amortization expense	1,037		1,823		2,592		3,647
Total operating income	$	102,870	$	109,059	$	262,855	$	167,485

Total assets by reportable segment were as follows:


	June 30, 2023		December 31, 2022
	(Thousands of Dollars)
Pipeline	$	3,304,918	$	3,360,685
Storage	1,410,647		1,438,609
Fuels marketing	29,045		37,763
Total segment assets	4,744,610		4,837,057
Other partnership assets	145,805		136,629
Total consolidated assets	$	4,890,415	$	4,973,686

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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+ Details