0001549922-22-000032 | 10-Q | XBRL Viewer | Summit Midstream Partners LP

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DEFERRED REVENUE (Details) $ in Thousands	9 Months Ended
DEFERRED REVENUE (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Change in Contract with Customer, Liability, Current [Roll Forward]
Current deferred revenue, beginning balance	$ 10,374
Add: additions	3,482
Less: revenue recognized	(4,680)
Current deferred revenue, ending balance	9,176
Change in Contract with Customer, Liability, Noncurrent [Roll Forward]
Noncurrent deferred revenue, beginning balance	42,570
Add: additions	269
Less: reclassification to current deferred revenue	(4,046)
Noncurrent deferred revenue, ending balance	$ 38,793

DEBT - Narrative (Details)	1 Months Ended		9 Months Ended
DEBT - Narrative (Details)	Nov. 30, 2021	Feb. 28, 2017	Sep. 30, 2022 USD ($)	Nov. 02, 2021 USD ($)	Mar. 08, 2021 USD ($)
Revolving credit facility \| LIBOR
Debt Instrument [Line Items]
Applicable margin (as a percent)			3.25%
ABL Facility
Debt Instrument [Line Items]
Borrowing capacity			$ 400,000,000	$ 400,000,000
Borrowing base capacity			$ 562,600,000
Mandatory redemption period			120 days
Maximum amount of debt outstanding for maturity to occur			$ 50,000,000
Debt Instrument, Interest Rate During Period			6.375%
Unused portion under the facility			$ 309,100,000
First lien net leverage ratio (as a percent)			0.38	2.50
Interest coverage ratio			2.57	2.00
ABL Facility \| Standby Letters of Credit
Debt Instrument [Line Items]
Secured notes			$ 5,900,000
Credit Agreement
Debt Instrument [Line Items]
Borrowing capacity					$ 175,000,000
Interest rate during period (as a percent)			4.90%
Unused portion of the Permian Transmission Credit facility			$ 4,500,000
Credit Agreement \| Standby Letters of Credit
Debt Instrument [Line Items]
Unused portion of the Permian Transmission Credit facility			$ 10,500,000
Credit Agreement \| LIBOR
Debt Instrument [Line Items]
Applicable margin (as a percent)			2.375%
Commitment fee (as a percent)			0.70%
Credit Agreement \| Term Loan Credit Facility
Debt Instrument [Line Items]
Borrowing capacity					160,000,000
Credit Agreement \| Working Capital Credit Facility
Debt Instrument [Line Items]
Borrowing capacity					$ 15,000,000
Secured Notes Indenture, 2026
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	100.00%
Secured Notes Indenture, 2026 \| Beginning October 15, 2024
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	102.125%
Secured Notes Indenture, 2026 \| Beginning October 15, 2025
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	100.00%
Secured Notes Indenture, 2026 \| Beginning October 15, 2023
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	104.25%
2025 Senior Notes \| Beginning October 15, 2024 \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount		101.438%
2025 Senior Notes \| Beginning October 15, 2025 \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount		100.00%
Permian Transmission Term Loan: Permian Transmission's variable rate senior secured term loan due March 8, 2028
Debt Instrument [Line Items]
Interest rate during period (as a percent)			4.90%
Permian Transmission Term Loan: Permian Transmission's variable rate senior secured term loan due March 8, 2028 \| LIBOR
Debt Instrument [Line Items]
Applicable margin (as a percent)			2.375%

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Partners' Capital and Schedule of Units (Details) - Common Units - shares	1 Months Ended	9 Months Ended
	Apr. 30, 2021	Sep. 30, 2022
Increase (Decrease) in Partners' Capital [Roll Forward]
Units, beginning balance (in shares)		7,169,834
Series A preferred unit exchange offer, net of shares withheld for taxes (in shares)	538,715	2,853,875
Common units issued for SMLP LTIP, net (in shares)		152,873
Units, ending balance (in shares)		10,176,582

EQUITY METHOD INVESTMENTS - Schedule of Equity Method Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investment in equity method investees	$ 513,974	$ 523,196
Double E
Schedule of Equity Method Investments [Line Items]
Investment in equity method investees	283,531	280,952
Ohio Gathering
Schedule of Equity Method Investments [Line Items]
Investment in equity method investees	$ 230,443	$ 242,244

FINANCIAL INSTRUMENTS - Fair value of Debt Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
2025 Senior Notes \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 259,463	$ 259,463
2025 Senior Notes \| Fair Value \| Estimated fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	212,111	234,814
2026 Secured Notes \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	700,000	700,000
2026 Secured Notes \| Fair Value \| Estimated fair value (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 650,708	$ 718,083

DEBT (Tables)

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

Schedule of Debt

Debt for the Partnership at September 30, 2022 and December 31, 2021, follows:


	September 30, 2022		December 31, 2021
	(In thousands)

ABL Facility: Summit Holdings' asset based credit facility due May 1, 2026	$	85,000	$	267,000
Permian Transmission Credit Facility: Permian Transmission's variable rate senior secured credit facility due March 8, 2028	—		160,000
Permian Transmission Term Loan: Permian Transmission's variable rate senior secured term loan due March 8, 2028	156,561		—


2025 Senior Notes: Summit Holdings' 5.75% senior unsecured notes due April 15, 2025	259,463		259,463

2026 Secured Notes: Summit Holdings' and Finance Corp's 8.50% senior unsecured notes due October 15, 2026	700,000		700,000
Less: unamortized debt discount and debt issuance costs	(26,826)		(31,391)
Total debt	1,174,198		1,355,072
Less: current portion	(9,009)		—
Total long-term debt	$	1,165,189	$	1,355,072

Schedule of Maturities of Long-term Debt

Below is a summary of the remaining mandatory principal repayments as of September 30, 2022:


(In thousands)	Total		2022		2023		2024		2025		2026		Thereafter
Amortizing principal repayments	$	156,561	$	1,205	$	10,507	$	15,524	$	16,580	$	16,967	$	95,778

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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+ Details

PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total	$ 2,130,715	$ 2,336,856
Less: accumulated depreciation	(653,664)	(610,774)
Property, plant and equipment, net	1,477,051	1,726,082
Gathering and processing systems and related equipment
Property, Plant and Equipment [Line Items]
Total	2,038,167	2,225,267
Construction in progress
Property, Plant and Equipment [Line Items]
Total	30,714	49,082
Land and line fill
Property, Plant and Equipment [Line Items]
Total	10,189	10,644
Other
Property, Plant and Equipment [Line Items]
Total	$ 51,645	$ 51,863

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Sep. 30, 2022	Dec. 31, 2021
Partners' Capital
Common limited partner capital (in shares), issued	10,176,582	7,169,834
Common limited partner capital (in shares), outstanding	10,176,582	7,169,834
Subsidiary Series A Preferred Units
Subsidiary Series A preferred unitholders, issued (in shares)	93,039,000	91,439,000
Preferred units, outstanding (in shares)	93,039,000	91,439,000
Series A Preferred Units
Subsidiary Series A preferred unitholders, issued (in shares)	65,508	143,447
Preferred units, outstanding (in shares)	65,508	143,447

COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

14. COMMITMENTS AND CONTINGENCIES

Environmental Matters. Although the Partnership believes that it is in material compliance with applicable environmental regulations, the risk of environmental remediation costs and liabilities are inherent in pipeline ownership and operation. Furthermore, the Partnership can provide no assurances that significant environmental remediation costs and liabilities will not be incurred in the future. The Partnership is currently not aware of any material contingent liabilities that exist with respect to environmental matters, except as noted below.

As of September 30, 2022, the Partnership has recognized (i) a current liability for remediation effort expenditures expected to be incurred within the next 12 months and (ii) a noncurrent liability for estimated remediation expenditures expected to be incurred subsequent to September 30, 2023. Each of these amounts represent the Partnership’s best estimate for costs expected to be incurred. Neither of these amounts have been discounted to their present value.

A rollforward of the Partnership’s undiscounted accrued environmental remediation follows and is primarily related to the 2015 Blacktail Release and other environmental remediation activities, as detailed below.


	(In thousands)
Accrued environmental remediation, December 31, 2021	$	5,606
Payments made	(2,372)
Changes in estimates	642
Accrued environmental remediation, September 30, 2022	$	3,876

In 2015, the Partnership learned of the rupture of a four-inch produced water gathering pipeline on the Meadowlark Midstream system near Williston, North Dakota (“2015 Blacktail Release”). On August 4, 2021, subsidiaries of the Partnership entered into the following agreements to resolve the U.S. federal and North Dakota state governments’ environmental claims with respect to the 2015 Blacktail Release: (i) a Consent Decree with the U.S. Department of Justice (“DOJ”), the U.S. Environmental Protection Agency (“EPA”), and the State of North Dakota (“Consent Decree”); (ii) a Plea Agreement with the United States (“Plea Agreement”); and (iii) a Consent Agreement with the North Dakota Industrial Commission (“Consent Agreement” together with the Consent Decree and Plea Agreement, the “Global Settlement”). As of September 30, 2022 and December 31, 2021, the accrued loss liability for the 2015 Blacktail Release was $31.7 million and $33.2 million, respectively.

Key terms of the Global Settlement included (i) payment of penalties and fines totaling $36.3 million, consisting of $1.25 million in natural resource damages payable to federal and state governments, a $25.0 million payable to the federal government over 5 years, and a $10.0 million payable to state governments over six years, with interest applied to unpaid amounts accruing at a fixed rate of 3.25%, and of which $5.6 million is expected to be paid within the next twelve months; (ii) continuation of remediation efforts at the site of the 2015 Blacktail Release; (iii) other injunctive relief including but not limited to control room management, environmental management system audit, training, and reporting; (iv) guilty pleas by Defendant subsidiary for (a) one charge of negligent discharge of a harmful quantity of oil and (b) one charge of knowing failure to immediately report a discharge of oil; and (v) organizational probation for a minimum period of three years from sentencing, including payment in full of certain components of the fines and penalty amounts. The agreements comprising the Global Settlement were subject to the approval of the U.S. District Court for the District of North Dakota (the “U.S. District Court”). The U.S. District Court entered an order making the civil components of the Global Settlement effective on September 28, 2021 and accepted the sentencing in the Plea Agreement on December 6, 2021, completing approval of the Global Settlement.

In conjunction with the criminal proceedings under the Plea Agreement, the U.S. District Court received two claims for restitution, including claims for diminution in property value and the cost of additional environmental testing. The prosecution notified the U.S District Court that the government declined to support the claims, citing “insufficient evidence to support the claims.” Defendant subsidiary of the Partnership has responded that restitution is not applicable in this matter because claimants did not provide any supporting evidence for their claims that showed any harm, and because the plea agreement in this matter does not permit restitution sought by the claimants. On August 4, 2022, the U.S. District Court denied the claims.

Subsidiaries of the Partnership are also participating in two proceedings before the EPA as a result of the Plea Agreement becoming effective. Following the U.S. District Court’s entering judgment on Defendant subsidiary’s guilty plea to one count of negligent discharge of produced water in violation of the Clean Water Act, Defendant subsidiary was statutorily debarred by operation of law pursuant to 33 U.S.C. § 1368(a) to participate in federal awards performed at the “violating facility,” which EPA determined to be the Marmon subsystem of the produced water gathering system in North Dakota. Defendant has submitted a petition for reinstatement, which was denied by the EPA’s suspension and debarment office (“SDO”) on July 11, 2022. The SDO determined that the term of probation in the Plea Agreement was the appropriate period of time to demonstrate Defendant subsidiary’s change of corporate attitude, policies, practices, and procedures. The Partnership and certain subsidiaries have also received a show cause notice from the EPA requesting us to “show cause” why SDO should not issue a Notice of Proposed Debarment to the Defendant subsidiary and certain affiliates under 2 C.F.R. § 180.800(d), to which we have responded.

Legal Proceedings. The Partnership is involved in various litigation and administrative proceedings arising in the ordinary course of business. In the opinion of management, any liabilities that may result from these claims or those arising in the ordinary course of business would not individually or in the aggregate have a material adverse effect on the Partnership's financial position or results of operations.

REVENUE - Schedule of Information about Contract Assets from Contracts with Customers (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Contract With Customer, Contract Asset, Contract Liability, and Receivable [Roll Forward]
Contract assets, beginning of period	$ 10,327
Additions	7,048
Transfers out	(8,891)
Contract assets, end of period	$ 8,484

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

9 Months Ended

Sep. 30, 2022

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures


	Nine Months Ended September 30,
	2022		2021
	(In thousands)
Supplemental cash flow information:
Cash interest paid	$	46,093	$	42,104
Cash paid for taxes	$	149	$	191

Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	$	4,102	$	5,614


Accretion of Subsidiary Series A Preferred Units, net of issuance cost amortization	$	10,554	$	7,716
Exercise of ECP Warrants	$	—	$	15,542
2022 Preferred Exchange Offer	$	92,587	$	—
2021 Preferred Exchange Offer	$	—	$	20,654

COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) claim	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Legal fines and other fees	$ 36,300
Claims settled \| claim	1
2015 Blacktail Release
Loss Contingencies [Line Items]
Loss contingency accrual	$ 31,700	$ 33,200
Unpaid penalties and fines, fixed rate (as a percent)	3.25%
Expected payment	$ 5,600
Claims settled \| claim	1
Pending claims \| claim	2
Natural Resource Damages To Federal and State Governments \| 2015 Blacktail Release
Loss Contingencies [Line Items]
Legal fines and other fees	$ 1,250
Penalties and fines, payment period	5 years
Damages Payable To Federal Government over Five Years \| 2015 Blacktail Release
Loss Contingencies [Line Items]
Legal fines and other fees	$ 25,000
Damages Payable To State Governments Over Six Years \| 2015 Blacktail Release
Loss Contingencies [Line Items]
Legal fines and other fees	$ 10,000
Penalties and fines, payment period	6 years

FINANCIAL INSTRUMENTS

9 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS

9. FINANCIAL INSTRUMENTS

Fair Value. A summary of the estimated fair value of our financial instruments follows.


	September 30, 2022				December 31, 2021
	Carrying Value (1)		Estimated fair value (Level 2)		Carrying Value (1)		Estimated fair value (Level 2)
	(In thousands)

2025 Senior Notes	$	259,463	$	212,111	$	259,463	$	234,814
2026 Secured Notes	700,000		650,708		700,000		718,083

________

(1) Excludes applicable unamortized debt issuance costs and debt discounts.

The carrying values on the balance sheets of the ABL Facility and Permian Transmission Term Loan represents their fair value due to their floating interest rates. The fair values of the 2026 Secured Notes and 2025 Senior Notes are based on an average of nonbinding broker quotes as of September 30, 2022 and December 31, 2021. The use of different market assumptions or valuation methodologies may have a material effect on their estimated fair value.

Interest Rate Swaps. In connection with the Permian Transmission Term Loan, formerly the Permian Transmission Credit Facility, the Partnership entered into amortizing interest rate swap agreements. As of September 30, 2022 and December 31, 2021, the outstanding notional amounts of interest rate swaps were $140.9 million and $144.0 million, respectively. These interest rate swaps manage exposure to variability in expected cash flows attributable to interest rate risk. Interest rate swaps convert a portion of the Partnership’s variable rate debt to fixed rate debt. The Partnership chooses counterparties for its derivative instruments that it believes are creditworthy at the time the transactions are entered into, and the Partnership actively monitors the creditworthiness where applicable. However, there can be no assurance that a counterparty will be able to meet its obligations to the Partnership. The Partnership presents its derivative positions on a gross basis and does not net the asset and liability positions.

As of September 30, 2022, the Partnership’s interest rate swap agreements had a fair value of $16.1 million and are recorded within other noncurrent assets within the unaudited condensed consolidated balance sheets. The derivative instruments’ fair value are determined using level 2 inputs from the fair value hierarchy. For the three and nine months ended September 30, 2022, the Company recorded a gain on interest rate swaps of $5.5 million and $16.5 million, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (99,597)	$ (3,744)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	90,101	88,570
Noncash lease expense	675	793
Amortization of debt issuance costs	6,642	5,176
Unit-based and noncash compensation	2,964	3,883
Income from equity method investees	(14,162)	(6,694)
Distributions from equity method investees	31,764	20,004
Gain on asset sales, net	(409)	(352)
Loss on sale of business	85	0
Loss on ECP Warrants	0	13,635
Unrealized (gain) loss on interest rate swaps	(16,870)	(1,939)
Long-lived asset impairment	91,644	1,773
Changes in operating assets and liabilities:
Accounts receivable	(1,323)	(6,531)
Trade accounts payable	4,284	197
Accrued expenses	(2,040)	1,129
Deferred revenue, net	(4,861)	(4,413)
Ad valorem taxes payable	(1,769)	(2,555)
Accrued interest	21,448	585
Accrued environmental remediation, net	(1,730)	1,946
Other, net	(10,041)	16,268
Net cash provided by operating activities	96,805	127,731
Cash flows from investing activities:
Capital expenditures	(20,955)	(11,780)
Proceeds from asset sale	4,646	8,000
Investment in Double E equity method investee	(8,444)	(102,109)
Net cash provided from (used in) investing activities	87,438	(105,889)
Cash flows from financing activities:
Repayments on Revolving Credit Facility	0	(132,000)
Borrowings under Permian Transmission Credit Facility	0	107,000
Repayments on Permian Transmission Term Loan	(3,442)	0
Repayments on ABL Facility	(205,000)	0
Borrowings on ABL Facility	23,000
Distributions on Subsidiary Series A Preferred Units	(1,628)	0
Distribution to unit holders	0	0
Debt issuance costs	0	(5,179)
Proceeds from asset sale	0	357
Other, net	(2,781)	(1,303)
Net cash used in financing activities	(189,851)	(31,125)
Net change in cash, cash equivalents and restricted cash	(5,608)	(9,283)
Cash, cash equivalents and restricted cash, beginning of period	19,572	15,544
Cash, cash equivalents and restricted cash, end of period	13,964	6,261
Lane G&P System
Cash flows from investing activities:
Proceeds from sale of Lane G&P System, net of cash sold in transaction	75,520	0
Bison Midstream, LLC
Cash flows from investing activities:
Proceeds from sale of Lane G&P System, net of cash sold in transaction	$ 36,671	$ 0

DEBT

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

DEBT

8. DEBT

Debt for the Partnership at September 30, 2022 and December 31, 2021, follows:


	September 30, 2022		December 31, 2021
	(In thousands)

ABL Facility: Summit Holdings' asset based credit facility due May 1, 2026	$	85,000	$	267,000
Permian Transmission Credit Facility: Permian Transmission's variable rate senior secured credit facility due March 8, 2028	—		160,000
Permian Transmission Term Loan: Permian Transmission's variable rate senior secured term loan due March 8, 2028	156,561		—


2025 Senior Notes: Summit Holdings' 5.75% senior unsecured notes due April 15, 2025	259,463		259,463

2026 Secured Notes: Summit Holdings' and Finance Corp's 8.50% senior unsecured notes due October 15, 2026	700,000		700,000
Less: unamortized debt discount and debt issuance costs	(26,826)		(31,391)
Total debt	1,174,198		1,355,072
Less: current portion	(9,009)		—
Total long-term debt	$	1,165,189	$	1,355,072

ABL Facility. On November 2, 2021, the Partnership, the Partnership’s subsidiary, Summit Holdings, and the subsidiaries of Summit Holdings party thereto entered into a first-lien, senior secured credit facility, consisting of a $400.0 million asset-based revolving credit facility (the “ABL Facility”), subject to a borrowing base comprised of a percentage of eligible accounts receivable of Summit Holdings and its subsidiaries that guarantee the ABL Facility (collectively, the “ABL Facility Subsidiary Guarantors”) and a percentage of eligible above-ground fixed assets including eligible compression units, processing plants, compression stations and related equipment of Summit Holdings and the ABL Facility Subsidiary Guarantors. As of

September 30, 2022, the most recent borrowing base determination of eligible assets totaled $562.6 million, an amount greater than the $400.0 million of aggregate commitments.

The ABL Facility will mature on May 1, 2026; provided that, (a) if the outstanding amount of the 2025 Senior Notes (or any permitted refinancing indebtedness in respect thereof that has a final maturity, scheduled amortization or any other scheduled repayment, mandatory prepayment, mandatory redemption or sinking fund obligation prior to the date that is 120 days after the Termination Date (as defined in the ABL Agreement)) on such date equals or exceeds $50,000,000, then the ABL Facility will mature on December 13, 2024 and (b) if both (i) any amount of the 2025 Senior Notes (or any permitted refinancing indebtedness in respect thereof that has a final maturity, scheduled amortization or any other scheduled repayment, mandatory prepayment, mandatory redemption or sinking fund obligation prior to the date that is 120 days after the Termination Date) is outstanding on such date and (ii) Liquidity (as defined in the ABL Agreement) is less than an amount equal to the sum of the then aggregate outstanding principal amount of the 2025 Senior Notes (or any permitted refinancing indebtedness in respect thereof that has a final maturity, scheduled amortization or any other scheduled repayment, mandatory prepayment, mandatory redemption or sinking fund obligation prior to the date that is 120 days after the Termination Date) plus the Threshold Amount (as defined in the ABL Agreement) on such date, then the ABL Facility will mature on January 14, 2025.

As of September 30, 2022, the applicable margin under the adjusted LIBOR borrowings was 3.25%, the interest rate was 6.375% and the available borrowing capacity of the ABL Facility totaled $309.1 million after giving effect to the issuance of $5.9 million in outstanding but undrawn irrevocable standby letters of credit.

The ABL Facility requires that Summit Holdings not permit (i) the First Lien Net Leverage Ratio (as defined in the ABL Agreement) as of the last day of any fiscal quarter to be greater than 2.50:1.00, or (ii) the Interest Coverage Ratio (as defined in the ABL Agreement) as of the last day of any fiscal quarter to be less than 2.00:1.00. As of September 30, 2022, the First Lien Net Leverage Ratio was 0.38:1.00 and the Interest Coverage Ratio was 2.57:1.00 As of September 30, 2022, the Partnership was in compliance with the financial covenants of the ABL Facility.

Permian Transmission Credit Facility. On March 8, 2021 (the “Permian Closing Date”), the Partnership’s unrestricted subsidiary, Permian Transmission, entered into a Credit Agreement which provided for $175.0 million of senior secured credit facilities (the “Permian Transmission Credit Facilities”), including a $160.0 million Term Loan Facility and a $15.0 million Working Capital Facility. Borrowings from the Permian Transmission Credit Facilities were used to finance Permian Transmission’s capital calls associated with its investment in Double E. In January 2022, in accordance with the terms of Permian Transmission Credit Facilities, the Partnership converted the $160.0 million portion of the Permian Transmission Credit Facilities into a term loan facility (the “Permian Term Loan Facility”).

As of September 30, 2022, the applicable margin under adjusted LIBOR borrowings was 2.375%, the interest rate was 4.90% and the available borrowing capacity of the Permian Transmission Credit Facility totaled $4.5 million, subject to a commitment fee of 0.7% after giving effect to the issuance of $10.5 million in outstanding but undrawn irrevocable standby letters of credit and surety bonds. As of September 30, 2022, the Partnership was in compliance with the financial covenants of the Permian Transmission Credit Facility.

Permian Transmission Term Loan. As described above, in January 2022, the Permian Transmission Term Loan Facility was converted into a Term Loan (the “Permian Transmission Term Loan”). The Permian Transmission Term Loan is due on May 8, 2028. As of September 30, 2022, the applicable margin under adjusted LIBOR borrowings was 2.375% and the interest rate was 4.90%. As of September 30, 2022, the Partnership was in compliance with the financial covenants governing the Permian Transmission Term Loan.

In accordance with the terms of the Permian Transmission Term Loan, Permian Transmission is required to make mandatory principal repayments. Below is a summary of the remaining mandatory principal repayments as of September 30, 2022:


(In thousands)	Total		2022		2023		2024		2025		2026		Thereafter
Amortizing principal repayments	$	156,561	$	1,205	$	10,507	$	15,524	$	16,580	$	16,967	$	95,778

2026 Secured Notes. In November 2021, the Co-Issuers issued the 2026 Secured Notes. The 2026 Secured Notes are senior secured second lien notes due 2026. The 2026 Secured Notes will pay interest semi-annually in cash in arrears on April 15 and October 15 of each year, commencing on April 15, 2022, and will be jointly and severally guaranteed, on a senior second-priority secured basis (subject to permitted liens), by the Partnership and each restricted subsidiary of the Partnership (other than the Co-Issuers) that is an obligor under the ABL Agreement, or under the Co-Issuers’ 2025 Senior Notes on the issue date of the 2026 Secured Notes.

The 2026 Secured Notes are effectively subordinated to any of our or the guarantors’ current and future secured first lien indebtedness, including indebtedness incurred under the ABL Facility, to the extent of the value of the collateral securing such indebtedness, and our and the guarantors’ current and future debt that is secured by liens on assets other than the collateral, to the extent of the value of such assets. The 2026 Secured Notes are structurally subordinated to all indebtedness and other

liabilities of our subsidiaries that do not guarantee the 2026 Secured Notes. The 2026 Secured Notes are effectively equal to our and the guarantors’ obligations under any future second lien indebtedness and effectively senior to all of our future junior lien indebtedness and existing and future unsecured indebtedness, including our outstanding senior unsecured notes, to the extent of the value of the collateral, and senior to any of our future subordinated indebtedness. The 2026 Secured Notes will mature on October 15, 2026.

Before October 15, 2023, the Co-Issuers may redeem the 2026 Secured Notes, in whole or in part, at a price equal to 100% of their principal amount, plus a make-whole premium, together with accrued and unpaid interest to, but not including the redemption date. On and after October 15, 2023, the Co-Issuers may redeem all or part of the 2026 Secured Notes at redemption prices (expressed as percentages of principal amount) equal to: (a) 104.250% for the twelve-month period beginning October 15, 2023; (b) 102.125% for the twelve-month period beginning October 15, 2024; and (c) 100.000% for the twelve-month period beginning on October 15, 2025 and at any time thereafter, in each case plus accrued and unpaid interest, if any, to, but not including, the redemption date. As of September 30, 2022, the Partnership was in compliance with the financial covenants governing its 2026 Secured Notes.

2025 Senior Notes. In February 2017, the Co-Issuers co-issued the 2025 Senior Notes. The 2025 Senior Notes will pay interest semi-annually in cash in arrears on April 15 and October 15 of each year. The 2025 Senior Notes are senior, unsecured obligations and rank equally in right of payment with all of the Partnership’s existing and future senior obligations. The 2025 Senior Notes are effectively subordinated in right of payment to all of the Partnership’s secured indebtedness, to the extent of the collateral securing such indebtedness.

The Co-Issuers have the right to redeem all or part of the 2025 Senior Notes at a redemption price of 101.438% (with the redemption price declining to 100.00% on April 15, 2023 and thereafter), plus accrued and unpaid interest, if any, to, but not including the redemption date.

As of September 30, 2022, the Partnership was in compliance with the financial covenants governing its 2025 Senior Notes.

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI https://asc.fasb.org/topic&trid=2208564

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (h)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1E
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

+ Details

EQUITY METHOD INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2022

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Equity Method Investments

Details of the Partnership’s equity method investments follow.


	September 30, 2022		December 31, 2021
	(In thousands)
Double E	$	283,531	$	280,952
Ohio Gathering	230,443		242,244
Total	$	513,974	$	523,196

PARTNERS' CAPITAL AND MEZZANINE CAPITAL (Tables)

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

Schedule Of Partner Units Activity

A rollforward of the number of issued and outstanding common limited partner units follows for the period from December 31, 2021 to September 30, 2022.


			Common Units
Units, December 31, 2021			7,169,834
2022 Preferred Exchange Offer, net of units withheld for taxes			2,853,875
Common units issued for SMLP LTIP, net			152,873
Units, September 30, 2022			10,176,582

Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net

The following table shows the change in our Subsidiary Series A Preferred Unit balance from January 1, 2022 to September 30, 2022, net of $2.4 million and $3.9 million of unamortized issuance costs at September 30, 2022 and December 31, 2021, respectively:


	(In thousands)
Balance at December 31, 2021	$	106,325
PIK distributions	1,600
Redemption accretion, net of issuance cost amortization	10,554
Cash distribution (includes a $1.6 million distribution payable as of September 30, 2022)	(3,256)
Balance at September 30, 2022	$	115,223

FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Concentration Risk [Line Items]
Gain on interest rate swaps	$ 5,527	$ 0	$ 16,491	$ 0
Interest Rate Swap
Concentration Risk [Line Items]
Derivative liability, notional amount	140,900		140,900		$ 144,000
Fair value, other assets	16,100		16,100
Gain on interest rate swaps	$ 5,500		$ 16,500

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Change in Subsidiary (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Increase (Decrease) in Partners' Capital [Roll Forward]
Distribution payable	$ 1,600
Series A Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Redemption accretion, net of issuance cost amortization	10,554	$ 7,716
Series A Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	106,325
Cash distribution	(3,256)
Ending balance	$ 115,223

EARNINGS PER UNIT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss	$ (7,788)	$ 7,004	$ (99,597)	$ (3,744)
Net loss attributable to Summit Midstream Partners, LP	(11,066)	2,751	(111,752)	(16,018)
Add: Deemed capital contribution from 2022 Preferred Exchange Offer	0	0	20,974	0
Add: Deemed capital contribution from 2021 Preferred Exchange Offer	$ 0	$ 0	$ 0	$ 8,326
Common unit - basic (in dollars per share)	$ (1.28)	$ (0.17)	$ (9.68)	$ (2.99)
Common unit - diluted (in dollars per share)	$ (1.28)	$ (0.17)	$ (9.68)	$ (2.99)
Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU (in shares)	0	367	0	193
Series A Preferred Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Less: net income attributable to Series A Preferred Units	$ (1,962)	$ (3,916)	$ (6,070)	$ (12,052)
Series A Preferred Units \| Subsidiaries
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Less: net income attributable to Series A Preferred Units	(3,278)	(4,253)	(12,155)	(12,274)
Common Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss attributable to common limited partners	$ (13,028)	$ (1,165)	$ (96,848)	$ (19,744)
Weighted-average common units outstanding – basic (in shares)	10,168,000	6,999,000	10,003,000	6,596,000
Effect of nonvested phantom units (in shares)	0	0	0	0
Weighted-average common units outstanding – diluted (in shares)	10,168,000	6,999,000	10,003,000	6,596,000

SEGMENT INFORMATION - Reconciliation of Net Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting [Abstract]
Income (loss) before income taxes and equity method investment income	$ (13,590)	$ 4,850	$ (113,452)	$ (10,779)
Add:
Corporate and Other expense	2,151	11,758	11,778	61,238
Interest expense	24,932	15,530	73,982	44,985
Depreciation and amortization	29,076	31,226	90,101	88,570
Proportional adjusted EBITDA for equity method investees	11,949	6,690	33,807	20,403
Adjustments related to capital reimbursement activity	(1,517)	(1,549)	(4,823)	(5,019)
Unit-based and noncash compensation	692	868	2,964	3,883
Gain on asset sales, net	(99)	(212)	(409)	(352)
Long-lived asset impairments	7,016	248	91,644	1,773
Total of reportable segments' measures of profit	$ 60,610	$ 69,409	$ 185,592	$ 204,702

DISPOSITIONS (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
DISPOSITIONS (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 19, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of business	$ (85)		$ 0	$ (85)	$ 0
Double E
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership interest		70.00%
Bison Midstream, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of Lane G&P System, net of cash sold in transaction				36,671	0
Lane G&P System
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of Lane G&P System, net of cash sold in transaction				75,520	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Bison Midstream, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration						$ 40,000
Impairment on disposition	6,900
Proceeds from sale of Lane G&P System, net of cash sold in transaction	36,700
Net book value of assets and liabilities divested	43,600			$ 43,600
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Lane G&P System
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration		$ 75,000
Impairment on disposition		84,500
Proceeds from sale of Lane G&P System, net of cash sold in transaction		77,500
Cash sold, working capital and other miscellaneous adjustments		2,000
Net book value of assets and liabilities divested		160,800
Other costs to sell		$ 1,200
Loss on sale of business	$ 100

DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Less: unamortized debt discount and debt issuance costs	$ (26,826)	$ (31,391)
Total debt	1,174,198	1,355,072
Less: current portion	(9,009)	0
Long-term debt, net of issuance costs	1,165,189	1,355,072
ABL Facility: Summit Holdings' asset based credit facility due May 1, 2026 \| Line of Credit
Line of Credit Facility [Line Items]
Secured notes	85,000	267,000
Permian Transmission Credit Facility: Permian Transmission's variable rate senior secured credit facility due March 8, 2028 \| Line of Credit
Line of Credit Facility [Line Items]
Secured notes	0	160,000
Permian Transmission Term Loan: Permian Transmission's variable rate senior secured term loan due March 8, 2028
Line of Credit Facility [Line Items]
Term loan	156,561
Permian Transmission Term Loan: Permian Transmission's variable rate senior secured term loan due March 8, 2028 \| Line of Credit
Line of Credit Facility [Line Items]
Term loan	$ 156,561	$ 0
2025 Senior Notes: Summit Holdings' 5.75% senior unsecured notes due April 15, 2025
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)	5.75%	5.75%
2025 Senior Notes: Summit Holdings' 5.75% senior unsecured notes due April 15, 2025 \| Senior Notes
Line of Credit Facility [Line Items]
Unsecured notes	$ 259,463	$ 259,463
2026 Secured Notes: Summit Holdings' and Finance Corp's 8.50% senior unsecured notes due October 15, 2026
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)	8.50%	8.50%
2026 Secured Notes: Summit Holdings' and Finance Corp's 8.50% senior unsecured notes due October 15, 2026 \| Secured Debt
Line of Credit Facility [Line Items]
Unsecured notes	$ 700,000	$ 700,000

PROPERTY, PLANT AND EQUIPMENT - Schedule of Depreciation Expense and Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 22,474	$ 23,867	$ 70,235	$ 66,651
Capitalized interest	$ 128	$ 85	$ 711	$ 395

REVENUE (Tables)

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Schedule of Estimated Revenue Expected to be Recognized and MVC Shortfall Payments

The following table presents estimated revenue expected to be recognized during the remainder of 2022 and over the remaining contract period related to performance obligations that are unsatisfied and are comprised of estimated minimum volume commitments.


(In thousands)	2022		2023		2024		2025		2026		Thereafter

Gathering services and related fees	$	20,535	$	63,214	$	52,412	$	35,805	$	21,024	$	—

Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments

Revenue by category. In the following tables, revenue is disaggregated by geographic area and major products and services. For more detailed information about reportable segments, see Note 15 – Segment Information.


	Three Months Ended September 30, 2022
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	13,528	$	—	$	—	$	13,528
Rockies	17,209		14,111		4,823		36,143
Permian	—		—		891		891
Piceance	20,406		1,519		1,581		23,506
Barnett	10,671		998		2,622		14,291
Total reportable segments	61,814		16,628		9,917		88,359
Corporate and other	—		—		323		323
Total	$	61,814	$	16,628	$	10,240	$	88,682


	Nine Months Ended September 30, 2022
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	41,104	$	—	$	—	$	41,104
Rockies	51,508		42,697		14,708		108,913
Permian	3,669		17,381		3,208		24,258
Piceance	60,458		5,481		4,132		70,071
Barnett	30,726		1,784		6,356		38,866
Total reportable segments	187,465		67,343		28,404		283,212
Corporate and other	—		21		638		659
Total	$	187,465	$	67,364	$	29,042	$	283,871


	Three Months Ended September 30, 2021
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	15,705	$	—	$	—	$	15,705
Rockies	19,074		12,845		5,264		37,183
Permian	1,879		7,925		1,045		10,849
Piceance	24,104		1,166		1,114		26,384
Barnett	10,162		185		1,577		11,924
Total reportable segments	70,924		22,121		9,000		102,045
Corporate and other	—		—		—		—
Total	$	70,924	$	22,121	$	9,000	$	102,045


	Nine Months Ended September 30, 2021
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	48,438	$	—	$	—	$	48,438
Rockies	56,377		33,688		16,573		106,638
Permian	6,340		21,318		2,854		30,512
Piceance	74,415		4,044		3,523		81,982
Barnett	29,934		251		3,649		33,834
Total reportable segments	215,504		59,301		26,599		301,404
Corporate and other	—		—		—		—
Total	$	215,504	$	59,301	$	26,599	$	301,404

Schedule of Information about Contract Assets from Contracts with Customers

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


	Total
	(In thousands)
Contract assets, beginning balance December 31, 2021	$	10,327
Additions	7,048
Transfers out	(8,891)
Contract assets, ending balance September 30, 2022	$	8,484

FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

A summary of the estimated fair value of our financial instruments follows.


	September 30, 2022				December 31, 2021
	Carrying Value (1)		Estimated fair value (Level 2)		Carrying Value (1)		Estimated fair value (Level 2)
	(In thousands)

2025 Senior Notes	$	259,463	$	212,111	$	259,463	$	234,814
2026 Secured Notes	700,000		650,708		700,000		718,083

________

(1) Excludes applicable unamortized debt issuance costs and debt discounts.

UNIT-BASED AND NONCASH COMPENSATION	9 Months Ended
UNIT-BASED AND NONCASH COMPENSATION	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
UNIT-BASED AND NONCASH COMPENSATION	13. UNIT-BASED AND NONCASH COMPENSATION SMLP Long-Term Incentive Plan. The Partnership’s Long-Term Incentive Plan (“SMLP LTIP”) provides for equity awards to eligible officers, employees, consultants and directors of the Partnership, thereby linking the recipients’ compensation directly to SMLP’s performance. Significant items to note: •For the nine-month period ended September 30, 2022, the Partnership granted 146,529 phantom units and associated distribution equivalent rights to employees in connection with the Partnership’s annual incentive compensation award cycle. These awards had a grant date fair value of $14.21 per common unit and vest ratably over a 3-year period. •For the nine-month period ended September 30, 2022, the Partnership issued 38,664 common units to the Partnership’s six independent directors in connection with their annual compensation plan. These awards had a grant date fair value of $14.21 per common unit and vested immediately. •On June 24, 2022, unitholders of the Partnership approved the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, which increased the number of common units available for issuance to the Partnership’s employees, consultants and directors. As of September 30, 2022, approximately 1.2 million common units remained available for future issuance under the SMLP LTIP, which includes the impact of 0.3 million granted but unvested phantom units.

PROPERTY, PLANT AND EQUIPMENT

9 Months Ended

Sep. 30, 2022

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

5. PROPERTY, PLANT AND EQUIPMENT

Details on the Partnership’s property, plant and equipment follow.


	September 30, 2022		December 31, 2021
	(In thousands)
Gathering and processing systems and related equipment	$	2,038,167	$	2,225,267
Construction in progress	30,714		49,082
Land and line fill	10,189		10,644
Other	51,645		51,863
Total	2,130,715		2,336,856
Less: accumulated depreciation	(653,664)		(610,774)
Property, plant and equipment, net	$	1,477,051	$	1,726,082

Depreciation expense and capitalized interest for the Partnership follow.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands)
Depreciation expense	$	22,474	$	23,867	$	70,235	$	66,651
Capitalized interest	128		85		711		395

COMMITMENTS AND CONTINGENCIES (Tables)

9 Months Ended

Sep. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Schedule of Accrued Environmental Remediation


	(In thousands)
Accrued environmental remediation, December 31, 2021	$	5,606
Payments made	(2,372)
Changes in estimates	642
Accrued environmental remediation, September 30, 2022	$	3,876

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP (Policies)	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	The Partnership prepares its condensed consolidated financial statements in accordance with GAAP as established by the FASB and pursuant to the rules and regulations of the SEC pertaining to interim financial information. The unaudited condensed consolidated financial statements contained in this report include all normal and recurring material adjustments that, in the opinion of management, are necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented herein.
Use of Estimates	The Partnership makes estimates and assumptions that affect the reported amounts of assets and liabilities at the balance sheet dates, including fair value measurements, the reported amounts of revenues and expenses and the disclosure of commitments and contingencies. Although management believes these estimates are reasonable, actual results could differ from its estimates.
Consolidation	The unaudited condensed consolidated financial statements contained in this report include the assets, liabilities and results of operations of SMLP and its subsidiaries. All intercompany transactions among the consolidated entities have been eliminated in consolidation. Comprehensive income or loss is the same as net income or loss for all periods presented.
New accounting standards not yet implemented	New accounting standards not yet implemented. ASU No. 2020-6 Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815–40) (“ASU 2020-6”). ASU 2020-6 simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. The ASU is part of the FASB’s simplification initiative, which aims to reduce unnecessary complexity in GAAP. The ASU’s amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. The Partnership does not expect the provisions of ASU 2020-6 will have a material impact on its consolidated financial statements and disclosures. ASU No. 2020-4 Reference Rate Reform (“ASU 2020-4”). ASU 2020-4 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform on financial reporting. The amendments in ASU 2020-4 are effective as of March 12, 2020 through December 31, 2022. The Partnership does not expect the provisions of ASU 2020-4 will have a material impact on its consolidated financial statements and disclosures.

PROPERTY, PLANT AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2022

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Details on the Partnership’s property, plant and equipment follow.


	September 30, 2022		December 31, 2021
	(In thousands)
Gathering and processing systems and related equipment	$	2,038,167	$	2,225,267
Construction in progress	30,714		49,082
Land and line fill	10,189		10,644
Other	51,645		51,863
Total	2,130,715		2,336,856
Less: accumulated depreciation	(653,664)		(610,774)
Property, plant and equipment, net	$	1,477,051	$	1,726,082

Schedule Of Depreciation Expense And Capitalized Interest Costs

Depreciation expense and capitalized interest for the Partnership follow.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands)
Depreciation expense	$	22,474	$	23,867	$	70,235	$	66,651
Capitalized interest	128		85		711		395

COMMITMENTS AND CONTINGENCIES - Schedule of Environmental Matters (Details) - Meadowlark Midstream Gathering System $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Accrued environmental remediation, beginning balance	$ 5,606
Payments made	(2,372)
Changes in estimates	642
Accrued environmental remediation, ending balance	$ 3,876

UNIT-BASED AND NONCASH COMPENSATION (Details) - SMLP LTIP	9 Months Ended
	Sep. 30, 2022 director $ / shares shares
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units (in shares)	146,529
Grant date fair value (in dollars per share) \| $ / shares	$ 14.21
Vesting period	3 years
Unvested phantom units granted (in shares)	300,000
Common Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued units (in shares)	38,664
Number of directors \| director	6
Grant date fair value (in dollars per share) \| $ / shares	$ 14.21
Units remaining available (in shares)	1,200,000

SUBSEQUENT EVENTS	9 Months Ended
SUBSEQUENT EVENTS	Sep. 30, 2022
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	16. SUBSEQUENT EVENTS Acquisitions. On October 14, 2022, Summit Holdings entered into definitive agreements with each of Outrigger Energy II LLC (“Outrigger”) and Sterling Investment Holdings LLC (“Sterling”) to acquire each of Outrigger DJ Midstream LLC (“Outrigger DJ”) and Sterling Energy Investments LLC, Grasslands Energy Marketing LLC and Centennial Water Pipelines LLC (collectively, “Sterling DJ”), respectively. In these transactions (the “2022 DJ Acquisitions”), SMLP will acquire natural gas gathering and processing systems, a crude oil gathering system, freshwater rights and a freshwater delivery system located near Summit’s Hereford assets in Weld County, Colorado for an aggregate cash consideration of $305 million, subject to customary transaction adjustments. The Outrigger DJ and Sterling DJ consolidated asset portfolio is located in Weld, Morgan and Logan Counties, Colorado and Cheyenne County, Nebraska. The 2022 DJ Acquisitions are expected to close during the fourth quarter of 2022, subject to customary closing conditions and regulatory approvals, including under the Hart-Scott-Rodino Antitrust Improvements Act of 1976. The 2022 DJ Acquisitions will be financed through a combination of borrowings under SMLP’s ABL Facility and a new, fully committed issuance of $85 million aggregate principal amount of Senior Secured Second Lien Notes due 2026 (the “Additional 2026 Secured Notes”), subject to closing of the 2022 DJ Acquisitions. Financing Matters. On October 14, 2022, Summit Holdings entered into commitment letters with certain investors (the “Commitment Parties”) to purchase an aggregate of $85 million aggregate principal amount of 2026 Secured Notes (the “Additional 2026 Secured Notes”) at an issue price of not less than 99.26%. A definitive purchase agreement was executed on October 28, 2022 and the closing of the financing transaction is subject to the satisfaction of the conditions contained therein. On October 14, 2022, Summit Holdings entered into the First Amendment to Loan and Security Agreement (the “ABL Amendment”), pursuant to which Summit Holdings amended the ABL Agreement. The ABL Amendment includes amendments to the ABL Agreement that (a) permit SMLP to hold the proceeds of the Additional 2026 Secured Notes in a deposit account under the control of SMLP or one of its subsidiaries until the 2022 DJ Acquisitions are completed and (b) replace the ability of Summit Holdings to elect that borrowings under the ABL Agreement accrue interest at LIBOR, plus a margin, with the ability of Summit Holdings to elect that borrowings under the ABL Agreement accrue interest at a forward-looking term rate based on the secured overnight financing rate, plus a margin, and plus a spread adjustment ranging from 0.11448% to 0.42826% depending on the applicable interest period.

SUPPLEMENTAL CASH FLOW INFORMATION

9 Months Ended

Sep. 30, 2022

Supplemental Cash Flow Elements [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

12. SUPPLEMENTAL CASH FLOW INFORMATION


	Nine Months Ended September 30,
	2022		2021
	(In thousands)
Supplemental cash flow information:
Cash interest paid	$	46,093	$	42,104
Cash paid for taxes	$	149	$	191

Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	$	4,102	$	5,614


Accretion of Subsidiary Series A Preferred Units, net of issuance cost amortization	$	10,554	$	7,716
Exercise of ECP Warrants	$	—	$	15,542
2022 Preferred Exchange Offer	$	92,587	$	—
2021 Preferred Exchange Offer	$	—	$	20,654

PARTNERS' CAPITAL AND MEZZANINE CAPITAL - Narrative (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended			9 Months Ended	12 Months Ended
	May 28, 2020	May 27, 2020	Apr. 30, 2021	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2020	Sep. 30, 2022	Dec. 31, 2021	Jan. 31, 2022	Aug. 05, 2021
Partners Capital [Line Items]
Contributed capital from preferred units exchange				$ 20,900	$ 8,300
Maximum period following end of quarter to distribute all available cash						45 days
Common Units
Partners Capital [Line Items]
Series A preferred unit exchange offer, net of shares withheld for taxes (in shares)			538,715				2,853,875
Series A Preferred Units
Partners Capital [Line Items]
Subsidiary Series A preferred unitholders, outstanding (in shares)							65,508	143,447
Preferred units issued (in shares)							65,508	143,447
Subsidiary Series A Preferred Units
Partners Capital [Line Items]
Subsidiary Series A preferred unitholders, outstanding (in shares)							93,039,000	91,439,000
Preferred units issued (in shares)							93,039,000	91,439,000
Common Units
Partners Capital [Line Items]
Common units issued in exchange (in shares)										414,447
Common Units \| GP Buy-In
Partners Capital [Line Items]
Number of common units purchased (in shares)	537,307	8,059,609
Common Units \| ECP Holdings Warrant \| GP Buy-In
Partners Capital [Line Items]
Number of common units purchased (in shares)	129,360	1,940,391
Series A Preferred Units
Partners Capital [Line Items]
Accrued and unpaid distributions							$ 19,400
Preferred units issued (in shares)			18,662						77,939
Cash distribution							3,256
Redemption amount							118,700
Issuance costs							2,400	$ 3,900
Series A Preferred Units \| Subsidiary Series A Preferred Units
Partners Capital [Line Items]
Cash distribution							3,300
Cash distributions paid							1,600
PIK distributions							$ 1,600

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
ASSETS
Cash and cash equivalents	$ 10,450	$ 7,349
Restricted cash	3,514	12,223
Accounts receivable	57,593	62,121
Other current assets	4,834	5,676
Total current assets	76,391	87,369
Property, plant and equipment, net	1,477,051	1,726,082
Intangible assets, net	144,002	172,927
Investment in equity method investees	513,974	523,196
Other noncurrent assets	28,254	12,888
TOTAL ASSETS	2,239,672	2,522,462
LIABILITIES AND CAPITAL
Trade accounts payable	9,448	10,498
Accrued expenses	7,999	14,462
Deferred revenue	9,176	10,374
Ad valorem taxes payable	6,353	8,570
Accrued compensation and employee benefits	7,857	11,019
Accrued interest	34,185	12,737
Accrued environmental remediation	1,604	3,068
Current portion of long-term debt	9,009	0
Other current liabilities	11,474	8,509
Total current liabilities	97,105	79,237
Long-term debt, net of issuance costs	1,165,189	1,355,072
Noncurrent deferred revenue	38,793	42,570
Noncurrent accrued environmental remediation	2,272	2,538
Other noncurrent liabilities	29,269	32,357
Total liabilities	1,332,628	1,511,774
Commitments and contingencies (Note 14)
Mezzanine Capital
Subsidiary Series A Preferred Units (93,039 and 91,439 units issued and outstanding at September 30, 2022 and December 31, 2021, respectively)	115,223	106,325
Partners' Capital
Series A Preferred Units (65,508 and 143,447 units issued and outstanding at September 30, 2022 and December 31, 2021, respectively)	83,252	169,769
Common limited partner capital (10,176,582 and 7,169,834 units issued and outstanding at September 30, 2022 and December 31, 2021, respectively)	708,569	734,594
Total partners' capital	791,821	904,363
TOTAL LIABILITIES AND CAPITAL	$ 2,239,672	$ 2,522,462

DEFERRED REVENUE

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

DEFERRED REVENUE

7. DEFERRED REVENUE

Certain of the Partnership’s gathering and/or processing agreements provide for monthly or annual MVCs. The amount of the shortfall payment is based on the difference between the actual throughput volume shipped and/or processed for the applicable period and the MVC for the applicable period, multiplied by the applicable gathering or processing fee.

Many of the Partnership’s gas gathering agreements contain provisions that can reduce or delay the cash flows that it expects to receive from MVCs to the extent that a customer's actual throughput volumes are above or below its MVC for the applicable contracted measurement period.

The balances in deferred revenue as of September 30, 2022 and December 31, 2021 are primarily related to contributions in aid of construction which will be recognized as revenue over the life of the contract.

A rollforward of current deferred revenue follows.


	Total
	(In thousands)
Current deferred revenue, January 1, 2022	$	10,374
Add: additions	3,482
Less: revenue recognized	(4,680)
Current deferred revenue, September 30, 2022	$	9,176

A rollforward of noncurrent deferred revenue follows.


	Total
	(In thousands)
Noncurrent deferred revenue, January 1, 2022	$	42,570
Add: additions	269
Less: reclassification to current deferred revenue	(4,046)
Noncurrent deferred revenue, September 30, 2022	$	38,793

SEGMENT INFORMATION - Adjusted EBITDA by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 60,610	$ 69,409	$ 185,592	$ 204,702
Northeast
Segment Reporting Information [Line Items]
Adjusted EBITDA	19,353	20,720	57,989	64,274
Rockies
Segment Reporting Information [Line Items]
Adjusted EBITDA	14,262	18,722	43,991	49,606
Permian
Segment Reporting Information [Line Items]
Adjusted EBITDA	4,882	1,422	13,848	4,014
Piceance
Segment Reporting Information [Line Items]
Adjusted EBITDA	14,249	18,908	45,367	60,266
Barnett
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 7,864	$ 9,637	$ 24,397	$ 26,542

SEGMENT INFORMATION

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

SEGMENT INFORMATION

15. SEGMENT INFORMATION

In accordance with ASC No. 280 - Segment Reporting, the Partnership routinely evaluates whether its reportable segments have changed. In the fourth quarter of 2021, the Partnership changed its segment reporting to align with how the General Partner’s Chief Executive Officer, its chief operating decision maker, reviews financial information in order to allocate resources and assess performance. The new segment reporting as of December 31, 2021, resulted from changes enacted to optimize commercial efforts and geographic workforce in order to better align its commercial, engineering, and operational capabilities.

As a result of the revised reportable segment structure, the Partnership has recast the corresponding segment information for all periods presented.

As of September 30, 2022, the Partnership’s reportable segments are:

•Rockies – Includes the Partnership’s wholly owned midstream assets located in the Williston Basin and the DJ Basin.

•Permian – Includes the Partnership’s equity method investment in Double E and its wholly owned Lane G&P System, which was sold on June 30, 2022 to Matador. For additional information regarding the sale of the Lane G&P System, see Note 3 - Dispositions.

•Northeast – Includes the Partnership’s wholly owned midstream assets located in the Utica and Marcellus shale plays and the equity method investment in Ohio Gathering that is focused on the Utica Shale.

•Piceance – Includes the Partnership’s wholly owned midstream assets located in the Piceance Basin.

•Barnett – Includes the Partnership’s wholly owned midstream assets located in the Barnett Shale.

Corporate and Other represents those results that: (i) are not specifically attributable to a reportable segment; (ii) are not individually reportable; or (iii) have not been allocated to a reportable segment for the purpose of evaluating their performance, including certain general and administrative expense items, certain natural gas and crude oil marketing services and transaction costs.

Assets by reportable segment follow.


	September 30, 2022		December 31, 2021
	(In thousands)
Assets:
Northeast	$	600,394	$	623,224
Rockies	529,004		592,148
Permian	303,474		458,988
Piceance	489,474		524,218
Barnett	301,873		315,055
Total reportable segment assets	2,224,219		2,513,633
Corporate and Other	15,453		8,829
Total assets	$	2,239,672	$	2,522,462

Segment adjusted EBITDA by reportable segment follows.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands)
Reportable segment adjusted EBITDA
Northeast	$	19,353	$	20,720	$	57,989	$	64,274
Rockies	14,262		18,722		43,991		49,606
Permian	4,882		1,422		13,848		4,014
Piceance	14,249		18,908		45,367		60,266
Barnett	7,864		9,637		24,397		26,542
Total of reportable segments' measures of profit	$	60,610	$	69,409	$	185,592	$	204,702

A reconciliation of income or loss before income taxes and income from equity method investees to total of reportable segments' measures of profit follows.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands)
Reconciliation of income (loss) before income taxes and
income from equity method investees to total of
reportable segments' measures of profit:
Income (loss) before income taxes and income from equity method investees	$	(13,590)	$	4,850	$	(113,452)	$	(10,779)
Add:
Corporate and Other expense	2,151		11,758		11,778		61,238
Interest expense	24,932		15,530		73,982		44,985
Depreciation and amortization (1)	29,076		31,226		90,101		88,570
Proportional adjusted EBITDA for equity method investees	11,949		6,690		33,807		20,403
Adjustments related to capital reimbursement activity	(1,517)		(1,549)		(4,823)		(5,019)
Unit-based and noncash compensation	692		868		2,964		3,883
Gain on asset sales, net	(99)		(212)		(409)		(352)
Long-lived asset impairment	7,016		248		91,644		1,773
Total of reportable segments' measures of profit	$	60,610	$	69,409	$	185,592	$	204,702

________

(1) Includes the amortization expense associated with our favorable gas gathering contracts as reported in other revenues.

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 32
-Subparagraph (e)
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 32
-Subparagraph (d)
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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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
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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/topic&trid=2134510

+ Details

SEGMENT INFORMATION - Assets, Revenues, Depreciation and Amortization, and Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Assets	$ 2,239,672	$ 2,522,462
Reportable Segments
Segment Reporting Information [Line Items]
Assets	2,224,219	2,513,633
Reportable Segments \| Northeast
Segment Reporting Information [Line Items]
Assets	600,394	623,224
Reportable Segments \| Rockies
Segment Reporting Information [Line Items]
Assets	529,004	592,148
Reportable Segments \| Permian
Segment Reporting Information [Line Items]
Assets	303,474	458,988
Reportable Segments \| Piceance
Segment Reporting Information [Line Items]
Assets	489,474	524,218
Reportable Segments \| Barnett
Segment Reporting Information [Line Items]
Assets	301,873	315,055
Corporate and Other
Segment Reporting Information [Line Items]
Assets	$ 15,453	$ 8,829

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Supplemental cash flow information:
Cash interest paid				$ 46,093	$ 42,104
Cash paid for taxes				149	191
Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)				4,102	5,614
Exercise of ECP Warrants		$ 15,542		0	15,542
2022 Preferred Exchange Offer				92,587	0
2021 Preferred Exchange Offer	$ 0		$ 0
Partners' Capital
Noncash investing and financing activities:
Exercise of ECP Warrants		$ 15,542
2021 Preferred Exchange Offer	$ 92,587		$ 20,654	0	20,654
Series A Preferred Units
Noncash investing and financing activities:
Accretion of Subsidiary Series A Preferred Units, net of issuance cost amortization				$ 10,554	$ 7,716

DEFERRED REVENUE (Tables)

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Schedule of Contract with Customer, Contract Asset, Contract Liability, and Receivable

A rollforward of current deferred revenue follows.


	Total
	(In thousands)
Current deferred revenue, January 1, 2022	$	10,374
Add: additions	3,482
Less: revenue recognized	(4,680)
Current deferred revenue, September 30, 2022	$	9,176

A rollforward of noncurrent deferred revenue follows.


	Total
	(In thousands)
Noncurrent deferred revenue, January 1, 2022	$	42,570
Add: additions	269
Less: reclassification to current deferred revenue	(4,046)
Noncurrent deferred revenue, September 30, 2022	$	38,793

REVENUE - Schedule of Estimated Revenue Expected to be Recognized (Details) - Gathering services and related fees $ in Thousands	Sep. 30, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 20,535
Revenue, remaining performance obligation, expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 63,214
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 52,412
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
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, amount	$ 35,805
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
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, amount	$ 21,024
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
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, amount	$ 0
Revenue, remaining performance obligation, expected timing of satisfaction	1 year

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2022	Oct. 28, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-35666
Entity Registrant Name	Summit Midstream Partners, LP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-5200503
Entity Address, Address Line One	910 Louisiana Street
Entity Address, Address Line Two	Suite 4200
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	832
Local Phone Number	413-4770
Title of 12(b) Security	Common Units
Trading Symbol	SMLP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		10,176,582
Entity Central Index Key	0001549922
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues:
Total revenues	$ 88,682	$ 102,045	$ 283,871	$ 301,404
Costs and expenses:
Cost of natural gas and NGLs	15,080	21,072	64,162	58,174
Operation and maintenance	21,877	20,781	61,216	54,881
General and administrative	8,550	8,477	31,983	48,414
Depreciation and amortization	28,841	30,992	89,397	87,866
Transaction costs	1,517	1,060	1,750	1,276
Gain on asset sales, net	(99)	(212)	(409)	(352)
Long-lived asset impairments	7,016	248	91,644	1,773
Total costs and expenses	82,782	82,418	339,743	252,032
Other income (expense), net	0	753	(4)	(1,532)
Gain on interest rate swaps	5,527	0	16,491	0
Loss on sale of business	(85)	0	(85)	0
Loss on ECP Warrants	0	0	0	(13,634)
Interest expense	(24,932)	(15,530)	(73,982)	(44,985)
Income (loss) before income taxes and equity method investment income	(13,590)	4,850	(113,452)	(10,779)
Income tax (expense) benefit	68	79	(307)	341
Income from equity method investees	5,734	2,075	14,162	6,694
Net income (loss)	(7,788)	7,004	(99,597)	(3,744)
Net income (loss) attributable to Summit Midstream Partners, LP	(11,066)	2,751	(111,752)	(16,018)
Add: deemed contribution from 2022 Preferred Exchange Offer	0	0	20,974	0
Add: Deemed capital contribution from 2021 Preferred Exchange Offer	$ 0	$ 0	$ 0	$ 8,326
Net loss per limited partner unit:
Common unit - basic (in dollars per share)	$ (1.28)	$ (0.17)	$ (9.68)	$ (2.99)
Common unit - diluted (in dollars per share)	$ (1.28)	$ (0.17)	$ (9.68)	$ (2.99)
Series A Preferred Units
Costs and expenses:
Less: net income attributable to Series A Preferred Units	$ (1,962)	$ (3,916)	$ (6,070)	$ (12,052)
Series A Preferred Units \| Subsidiary
Costs and expenses:
Less: net income attributable to Series A Preferred Units	(3,278)	(4,253)	(12,155)	(12,274)
Common Units
Costs and expenses:
Net income (loss) attributable to limited partners	$ (13,028)	$ (1,165)	$ (96,848)	$ (19,744)
Weighted-average limited partner units outstanding:
Common units - basic (in shares)	10,168	6,999	10,003	6,596
Common units - diluted (in shares)	10,168	6,999	10,003	6,596
Gathering services and related fees
Revenues:
Total revenues	$ 61,814	$ 70,924	$ 187,465	$ 215,504
Natural gas, NGLs and condensate sales
Revenues:
Total revenues	16,628	22,121	67,364	59,301
Other revenues
Revenues:
Total revenues	$ 10,240	$ 9,000	$ 29,042	$ 26,599

REVENUE - Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 88,682	$ 102,045	$ 283,871	$ 301,404
Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	88,359	102,045	283,212	301,404
Reportable Segments \| Northeast
Disaggregation of Revenue [Line Items]
Total revenues	13,528	15,705	41,104	48,438
Reportable Segments \| Rockies
Disaggregation of Revenue [Line Items]
Total revenues	36,143	37,183	108,913	106,638
Reportable Segments \| Permian
Disaggregation of Revenue [Line Items]
Total revenues	891	10,849	24,258	30,512
Reportable Segments \| Piceance
Disaggregation of Revenue [Line Items]
Total revenues	23,506	26,384	70,071	81,982
Reportable Segments \| Barnett
Disaggregation of Revenue [Line Items]
Total revenues	14,291	11,924	38,866	33,834
Segment Reconciling Items
Disaggregation of Revenue [Line Items]
Total revenues	323	0	659	0
Gathering services and related fees
Disaggregation of Revenue [Line Items]
Total revenues	61,814	70,924	187,465	215,504
Gathering services and related fees \| Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	61,814	70,924	187,465	215,504
Gathering services and related fees \| Reportable Segments \| Northeast
Disaggregation of Revenue [Line Items]
Total revenues	13,528	15,705	41,104	48,438
Gathering services and related fees \| Reportable Segments \| Rockies
Disaggregation of Revenue [Line Items]
Total revenues	17,209	19,074	51,508	56,377
Gathering services and related fees \| Reportable Segments \| Permian
Disaggregation of Revenue [Line Items]
Total revenues	0	1,879	3,669	6,340
Gathering services and related fees \| Reportable Segments \| Piceance
Disaggregation of Revenue [Line Items]
Total revenues	20,406	24,104	60,458	74,415
Gathering services and related fees \| Reportable Segments \| Barnett
Disaggregation of Revenue [Line Items]
Total revenues	10,671	10,162	30,726	29,934
Gathering services and related fees \| Segment Reconciling Items
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Natural gas, NGLs and condensate sales
Disaggregation of Revenue [Line Items]
Total revenues	16,628	22,121	67,364	59,301
Natural gas, NGLs and condensate sales \| Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	16,628	22,121	67,343	59,301
Natural gas, NGLs and condensate sales \| Reportable Segments \| Northeast
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Natural gas, NGLs and condensate sales \| Reportable Segments \| Rockies
Disaggregation of Revenue [Line Items]
Total revenues	14,111	12,845	42,697	33,688
Natural gas, NGLs and condensate sales \| Reportable Segments \| Permian
Disaggregation of Revenue [Line Items]
Total revenues	0	7,925	17,381	21,318
Natural gas, NGLs and condensate sales \| Reportable Segments \| Piceance
Disaggregation of Revenue [Line Items]
Total revenues	1,519	1,166	5,481	4,044
Natural gas, NGLs and condensate sales \| Reportable Segments \| Barnett
Disaggregation of Revenue [Line Items]
Total revenues	998	185	1,784	251
Natural gas, NGLs and condensate sales \| Segment Reconciling Items
Disaggregation of Revenue [Line Items]
Total revenues	0	0	21	0
Other revenues
Disaggregation of Revenue [Line Items]
Total revenues	10,240	9,000	29,042	26,599
Other revenues \| Reportable Segments
Disaggregation of Revenue [Line Items]
Total revenues	9,917	9,000	28,404	26,599
Other revenues \| Reportable Segments \| Northeast
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Other revenues \| Reportable Segments \| Rockies
Disaggregation of Revenue [Line Items]
Total revenues	4,823	5,264	14,708	16,573
Other revenues \| Reportable Segments \| Permian
Disaggregation of Revenue [Line Items]
Total revenues	891	1,045	3,208	2,854
Other revenues \| Reportable Segments \| Piceance
Disaggregation of Revenue [Line Items]
Total revenues	1,581	1,114	4,132	3,523
Other revenues \| Reportable Segments \| Barnett
Disaggregation of Revenue [Line Items]
Total revenues	2,622	1,577	6,356	3,649
Other revenues \| Segment Reconciling Items
Disaggregation of Revenue [Line Items]
Total revenues	$ 323	$ 0	$ 638	$ 0

DISPOSITIONS	9 Months Ended
DISPOSITIONS	Sep. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
DISPOSITIONS	3. DISPOSITIONS Bison divestiture. On September 19, 2022, the Partnership completed the sale of Bison Midstream, LLC (“Bison Midstream”), its gas gathering system in Burke and Mountrail Counties, North Dakota to a subsidiary of Steel Reef Infrastructure Corp. (“Steel Reef”), an integrated owner and operator of associated gas capture, gathering and processing assets in North Dakota and Saskatchewan, for cash consideration of $40.0 million. During the quarterly period ended September 30, 2022, the Partnership recognized an impairment of $6.9 million related to the disposition of Bison Midstream based on total cash proceeds received of $36.7 million and net assets of $43.6 million. The cash proceeds were used to reduce amounts outstanding under the ABL Facility and are subject to a final working capital adjustment. Lane G&P System. On June 30, 2022, the Partnership completed the disposition of all the equity interests in Summit Permian, which owns the Lane Gathering and Processing System (“Lane G&P System”), to Longwood Gathering and Disposal Systems, LP (“Longwood”), a wholly owned subsidiary of Matador ͏Resources Company (“Matador”), for a cash sale price of $75.0 million. In connection with the transaction, the Partnership released, to a subsidiary of Matador, and Matador agreed to assume, take or-pay firm capacity on the Double E Pipeline. The Partnership is the operator of the Double E joint venture and owns a 70% interest. During the quarterly period ended June 30, 2022, the Partnership recognized an impairment of $84.5 million related to the disposition of the Lane G&P System based on total cash proceeds received of $77.5 million, including $2.0 million of cash sold in the transaction, net assets of $160.8 million, and other costs to sell of $1.2 million. The cash proceeds were used to reduce amounts outstanding under the ABL Facility. During the quarterly period ended September 30, 2022, the Partnership recognized an incremental loss of $0.1 million primarily as a result of recognition of a final working capital adjustment.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP There have been no changes to the Partnership’s significant accounting policies since December 31, 2021. New accounting standards not yet implemented. ASU No. 2020-6 Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815–40) (“ASU 2020-6”). ASU 2020-6 simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. The ASU is part of the FASB’s simplification initiative, which aims to reduce unnecessary complexity in GAAP. The ASU’s amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. The Partnership does not expect the provisions of ASU 2020-6 will have a material impact on its consolidated financial statements and disclosures. ASU No. 2020-4 Reference Rate Reform (“ASU 2020-4”). ASU 2020-4 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform on financial reporting. The amendments in ASU 2020-4 are effective as of March 12, 2020 through December 31, 2022. The Partnership does not expect the provisions of ASU 2020-4 will have a material impact on its consolidated financial statements and disclosures.

DEBT - Schedule of Maturities (Details) - Permian Transmission Term Loan: Permian Transmission's variable rate senior secured term loan due March 8, 2028 $ in Thousands	Sep. 30, 2022 USD ($)
Debt
Amortizing principal repayments	$ 156,561
2022	1,205
2023	10,507
2024	15,524
2025	16,580
2026	16,967
Thereafter	$ 95,778

EARNINGS PER UNIT

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

EARNINGS PER UNIT

11. EARNINGS PER UNIT

The following table details the components of EPU.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net loss among limited partner interests:
Net loss	$	(7,788)	$	7,004	$	(99,597)	$	(3,744)
Net income attributable to Subsidiary Series A Preferred Units	(3,278)		(4,253)		(12,155)		(12,274)
Net loss attributable to Summit Midstream Partners, LP	$	(11,066)	$	2,751	$	(111,752)	(16,018)

Less: Net income attributable to Series A Preferred Units	$	(1,962)	$	(3,916)	$	(6,070)	(12,052)
Add: Deemed capital contribution from 2022 Preferred Exchange Offer	—		—		20,974		—
Add: Deemed capital contribution from 2021 Preferred Exchange Offer	$	—	$	—	$	—	$	8,326
Net loss attributable to common limited partners	$	(13,028)	$	(1,165)	$	(96,848)	$	(19,744)

Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic	10,168		6,999		10,003		6,596
Effect of nonvested phantom units	—		—		—		—
Weighted-average common units outstanding – diluted	10,168		6,999		10,003		6,596

Net income per limited partner unit:
Common unit – basic	$	(1.28)	$	(0.17)	$	(9.68)	$	(2.99)
Common unit – diluted	$	(1.28)	$	(0.17)	$	(9.68)	$	(2.99)

Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU	—		367		—		193

REVENUE - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Receivables with customers	$ 42,300	$ 50,500
Contract assets included in accounts receivable	$ 8,484	$ 10,327

EQUITY METHOD INVESTMENTS

9 Months Ended

Sep. 30, 2022

Equity Method Investments and Joint Ventures [Abstract]

EQUITY METHOD INVESTMENTS

6. EQUITY METHOD INVESTMENTS

The Partnership has equity method investments in Double E and Ohio Gathering, the balances of which are included in the Investment in equity method investees caption on the unaudited condensed consolidated balance sheets. Details of the Partnership’s equity method investments follow.


	September 30, 2022		December 31, 2021
	(In thousands)
Double E	$	283,531	$	280,952
Ohio Gathering	230,443		242,244
Total	$	513,974	$	523,196

ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION	9 Months Ended
	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION	1. ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION Organization. Summit Midstream Partners, LP (including its subsidiaries, collectively “SMLP” or the “Partnership”) is a Delaware limited partnership that was formed in May 2012 and began operations in October 2012. SMLP is a value-oriented limited partnership focused on developing, owning and operating midstream energy infrastructure assets that are strategically located in unconventional resource basins, primarily shale formations, in the continental United States. The Partnership’s business activities are primarily conducted through various operating subsidiaries, each of which is owned or controlled by its wholly owned subsidiary holding company, Summit Holdings, a Delaware limited liability company. Business Operations. The Partnership provides natural gas gathering, compression, treating and processing services as well as crude oil and produced water gathering services pursuant to primarily long-term, fee-based agreements with its customers. The Partnership’s results are primarily driven by the volumes of natural gas that it gathers, compresses, treats and/or processes as well as by the volumes of crude oil and produced water that it gathers. Other than the Partnership’s investments in Double E and Ohio Gathering, all of its business activities are conducted through wholly owned operating subsidiaries. Presentation and Consolidation. The Partnership prepares its condensed consolidated financial statements in accordance with GAAP as established by the FASB and pursuant to the rules and regulations of the SEC pertaining to interim financial information. The unaudited condensed consolidated financial statements contained in this report include all normal and recurring material adjustments that, in the opinion of management, are necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented herein. These unaudited condensed consolidated financial statements and notes thereto should be read in conjunction with the consolidated financial statements and related notes that are included in the Partnership’s Annual Report on Form 10-K for the year ended December 31, 2021. The Partnership makes estimates and assumptions that affect the reported amounts of assets and liabilities at the balance sheet dates, including fair value measurements, the reported amounts of revenues and expenses and the disclosure of commitments and contingencies. Although management believes these estimates are reasonable, actual results could differ from its estimates. The unaudited condensed consolidated financial statements contained in this report include the assets, liabilities and results of operations of SMLP and its subsidiaries. All intercompany transactions among the consolidated entities have been eliminated in consolidation. Comprehensive income or loss is the same as net income or loss for all periods presented.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Jun. 30, 2021
Statement of Partners' Capital [Abstract]
Deemed contribution to common unit holders	$ 20.9	$ 8.3

REVENUE

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

REVENUE

4. REVENUE


(In thousands)	2022		2023		2024		2025		2026		Thereafter

Gathering services and related fees	$	20,535	$	63,214	$	52,412	$	35,805	$	21,024	$	—


	Three Months Ended September 30, 2022
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	13,528	$	—	$	—	$	13,528
Rockies	17,209		14,111		4,823		36,143
Permian	—		—		891		891
Piceance	20,406		1,519		1,581		23,506
Barnett	10,671		998		2,622		14,291
Total reportable segments	61,814		16,628		9,917		88,359
Corporate and other	—		—		323		323
Total	$	61,814	$	16,628	$	10,240	$	88,682


	Nine Months Ended September 30, 2022
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	41,104	$	—	$	—	$	41,104
Rockies	51,508		42,697		14,708		108,913
Permian	3,669		17,381		3,208		24,258
Piceance	60,458		5,481		4,132		70,071
Barnett	30,726		1,784		6,356		38,866
Total reportable segments	187,465		67,343		28,404		283,212
Corporate and other	—		21		638		659
Total	$	187,465	$	67,364	$	29,042	$	283,871


	Three Months Ended September 30, 2021
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	15,705	$	—	$	—	$	15,705
Rockies	19,074		12,845		5,264		37,183
Permian	1,879		7,925		1,045		10,849
Piceance	24,104		1,166		1,114		26,384
Barnett	10,162		185		1,577		11,924
Total reportable segments	70,924		22,121		9,000		102,045
Corporate and other	—		—		—		—
Total	$	70,924	$	22,121	$	9,000	$	102,045


	Nine Months Ended September 30, 2021
	Gathering services and related fees		Natural gas, NGLs and condensate sales		Other revenues		Total
	(In thousands)
Reportable Segments:
Northeast	$	48,438	$	—	$	—	$	48,438
Rockies	56,377		33,688		16,573		106,638
Permian	6,340		21,318		2,854		30,512
Piceance	74,415		4,044		3,523		81,982
Barnett	29,934		251		3,649		33,834
Total reportable segments	215,504		59,301		26,599		301,404
Corporate and other	—		—		—		—
Total	$	215,504	$	59,301	$	26,599	$	301,404

Contract balances. Contract assets relate to the Partnership’s rights to consideration for work completed but not billed at the reporting date and consist of the estimated MVC shortfall payments expected from its customers and unbilled activity

associated with contributions in aid of construction. Contract assets are transferred to trade receivables when the rights become unconditional. The following table provides information about contract assets from contracts with customers:


	Total
	(In thousands)
Contract assets, beginning balance December 31, 2021	$	10,327
Additions	7,048
Transfers out	(8,891)
Contract assets, ending balance September 30, 2022	$	8,484

As of September 30, 2022, receivables with customers totaled $42.3 million and contract assets totaled $8.5 million and are included in the accounts receivable caption on the unaudited condensed consolidated balance sheets.

As of December 31, 2021, receivables with customers totaled $50.5 million and contract assets totaled $10.3 million and are included in the accounts receivable caption on the unaudited condensed consolidated balance sheets.

Contract liabilities (deferred revenue) relate to the advance consideration received from customers primarily for contributions in aid of construction. The Partnership recognizes contract liabilities under these arrangements in revenue over the contract period. See Note 7 – Deferred Revenue for additional details.

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI https://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

+ Details

PARTNERS' CAPITAL AND MEZZANINE CAPITAL

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

PARTNERS' CAPITAL AND MEZZANINE CAPITAL

10. PARTNERS' CAPITAL AND MEZZANINE CAPITAL

Common Units. A rollforward of the number of issued and outstanding common limited partner units follows for the period from December 31, 2021 to September 30, 2022.


			Common Units
Units, December 31, 2021			7,169,834
2022 Preferred Exchange Offer, net of units withheld for taxes			2,853,875
Common units issued for SMLP LTIP, net			152,873
Units, September 30, 2022			10,176,582

Series A Preferred Units. As of September 30, 2022, the Partnership had 65,508 Series A Preferred Units outstanding and $19.4 million of accrued and unpaid distributions on its Series A Preferred Units.

Series A Preferred Unit Exchange Offers. In January 2022, the Partnership completed an offer to exchange its Series A Preferred Units for newly issued common units (the “2022 Preferred Exchange Offer”), whereby it issued 2,853,875 SMLP common units, net of units withheld for withholding taxes, in exchange for 77,939 Series A Preferred Units. As a result of the transaction, the Partnership recognized a deemed contribution of $20.9 million from the Series A Preferred Unit holders to the common unit holders.

In April 2021, the Partnership completed an offer to exchange its Series A Preferred Units for newly issued common units (the “2021 Preferred Exchange Offer”), whereby it issued 538,715 SMLP common units, net of units withheld for withholding taxes, in exchange for 18,662 Series A Preferred Units. As a result of the transaction, the Partnership recognized a deemed contribution of $8.3 million from the Series A Preferred Unit holders to the common unit holders.

Subsidiary Series A Preferred Units. The Partnership records its Subsidiary Series A Preferred Units at fair value upon issuance, net of issuance costs, and subsequently records an effective interest method accretion amount each reporting period to accrete the carrying value to a most probable redemption value that is based on a predetermined internal rate of return measure. If the Partnership elects to make payment-in-kind (“PIK”) distributions to holders of its Subsidiary Series A Preferred Units, these PIK distributions increase the liquidation preference on each Subsidiary Series A Preferred Unit. Net Income (Loss) attributable to our common units includes adjustments for PIK distributions and redemption accretion.

During the nine months ended September 30, 2022, the Partnership accrued a $3.3 million of cash distribution, of which $1.6 million was paid as of September 30, 2022. Additionally, during the nine months ended September 30, 2022, the Partnership elected to make PIK distributions, issuing 1,600 Subsidiary Series A Preferred Units, to the holders of its Subsidiary Series A Preferred Units. As of September 30, 2022, the Partnership had 93,039 Subsidiary Series A Preferred Units issued and outstanding.

If the Subsidiary Series A Preferred Units were redeemed on September 30, 2022, the redemption amount would be $118.7 million when considering the applicable multiple of invested capital metric and make-whole amount provisions contained in the Subsidiary Series A Preferred Unit agreement.


	(In thousands)
Balance at December 31, 2021	$	106,325
PIK distributions	1,600
Redemption accretion, net of issuance cost amortization	10,554
Cash distribution (includes a $1.6 million distribution payable as of September 30, 2022)	(3,256)
Balance at September 30, 2022	$	115,223

Warrants. On May 28, 2020, and in connection with the GP Buy-In Transaction, the Partnership issued (i) a warrant to purchase up to 537,307 SMLP common units (8,059,609 SMLP common units prior to the Reverse Unit Split) to SMP TopCo, LLC, a Delaware limited liability company and affiliate of ECP (“ECP NewCo”) (the “ECP NewCo Warrant”), and (ii) a warrant to purchase up to 129,360 SMLP common units (1,940,391 SMLP common units prior to the Reverse Unit Split) to SMLP Holdings, LLC, a Delaware limited liability company and affiliate of ECP (“ECP Holdings” and together with ECP NewCo, the "ECP Entities") (the “ECP Holdings Warrant” and together with the ECP NewCo Warrant, the “ECP Warrants”).

On August 5, 2021, the ECP Entities cashlessly exercised all of the ECP Warrants for an aggregate of 414,447 SMLP common units, net of the exercise price, as calculated pursuant to Section 3(c) of the ECP Warrants (the "ECP Warrant Exercise").

Cash Distribution Policy. In connection with the GP Buy-In Transaction, the Partnership suspended its cash distributions to holders of its common units, commencing with respect to the quarter ended March 31, 2020. Upon the resumption of distributions, the Partnership Agreement requires that it distribute all available cash, subject to reserves established by its General Partner, within 45 days after the end of each quarter to unitholders of record on the applicable record date. The amount of distributions paid under this policy is subject to fluctuations based on the amount of cash the Partnership generates from its business and the decision to make any distribution is determined by the General Partner, taking into consideration the terms of the Partnership Agreement. There were no distributions paid during the three and nine months ended September 30, 2022 or during the twelve months ended December 31, 2021.

SUBSEQUENT EVENTS (Details) - Subsequent Event	Oct. 14, 2022 USD ($)
2022 DJ Acquisitions
Subsequent Event [Line Items]
Cash paid to acquire investment	$ 305,000,000
Senior Secured Second Lien Notes Due 2026
Subsequent Event [Line Items]
Debt offering	$ 85,000,000
Debt issued as a percent of face value	99.26%
Senior Secured Second Lien Notes Due 2026 \| Minimum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Subsequent Event [Line Items]
Applicable margin (as a percent)	0.11448%
Senior Secured Second Lien Notes Due 2026 \| Maximum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Subsequent Event [Line Items]
Applicable margin (as a percent)	0.42826%

EARNINGS PER UNIT (Tables)

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table details the components of EPU.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net loss among limited partner interests:
Net loss	$	(7,788)	$	7,004	$	(99,597)	$	(3,744)
Net income attributable to Subsidiary Series A Preferred Units	(3,278)		(4,253)		(12,155)		(12,274)
Net loss attributable to Summit Midstream Partners, LP	$	(11,066)	$	2,751	$	(111,752)	(16,018)

Less: Net income attributable to Series A Preferred Units	$	(1,962)	$	(3,916)	$	(6,070)	(12,052)
Add: Deemed capital contribution from 2022 Preferred Exchange Offer	—		—		20,974		—
Add: Deemed capital contribution from 2021 Preferred Exchange Offer	$	—	$	—	$	—	$	8,326
Net loss attributable to common limited partners	$	(13,028)	$	(1,165)	$	(96,848)	$	(19,744)

Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic	10,168		6,999		10,003		6,596
Effect of nonvested phantom units	—		—		—		—
Weighted-average common units outstanding – diluted	10,168		6,999		10,003		6,596

Net income per limited partner unit:
Common unit – basic	$	(1.28)	$	(0.17)	$	(9.68)	$	(2.99)
Common unit – diluted	$	(1.28)	$	(0.17)	$	(9.68)	$	(2.99)

Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU	—		367		—		193

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	Partners' Capital	Partners' Capital Series A Preferred Stock
Beginning balance at Dec. 31, 2020	$ 922,891	$ 748,466	$ 174,425
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5,056	769	4,287
Unit-based compensation	1,967	1,967
Tax withholdings and associated payments on vested SMLP LTIP awards	(1,274)	(1,274)
Ending balance at Mar. 31, 2021	928,640	749,928	178,712
Beginning balance at Dec. 31, 2020	922,891	748,466	174,425
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of Preferred Exchange Offer		20,654
Exercise of ECP Warrants	15,542
Ending balance at Sep. 30, 2021	924,098	758,275	165,823
Beginning balance at Mar. 31, 2021	928,640	749,928	178,712
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(23,827)	(27,676)	3,849
Unit-based compensation	1,048	1,048
Tax withholdings and associated payments on vested SMLP LTIP awards	(98)	(98)
Tax withholdings on 2021 Preferred Exchange Offer	(465)	(465)
Effect of Preferred Exchange Offer	0	20,654	(20,654)
Ending balance at Jun. 30, 2021	905,298	743,391	161,907
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,751	(1,165)	3,916
Unit-based compensation	868	868
Tax withholdings and associated payments on vested SMLP LTIP awards	(361)	(361)
Exercise of ECP Warrants	15,542	15,542
Ending balance at Sep. 30, 2021	924,098	758,275	165,823
Beginning balance at Dec. 31, 2021	904,363	734,594	169,769
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(5,718)	(7,938)	2,220
Unit-based compensation	1,690	1,690
Tax withholdings and associated payments on vested SMLP LTIP awards	(562)	(562)
Tax withholdings on 2022 Preferred Exchange Offer	(2,652)	(2,652)
Effect of Preferred Exchange Offer	0	92,587	(92,587)
Ending balance at Mar. 31, 2022	897,121	817,719	79,402
Beginning balance at Dec. 31, 2021	904,363	734,594	169,769
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of Preferred Exchange Offer		0
Exercise of ECP Warrants	0
Ending balance at Sep. 30, 2022	791,821	708,569	83,252
Beginning balance at Mar. 31, 2022	897,121	817,719	79,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(94,968)	(96,856)	1,888
Unit-based compensation	582	582
Tax withholdings and associated payments on vested SMLP LTIP awards	(327)	(327)
Ending balance at Jun. 30, 2022	802,408	721,118	81,290
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(11,066)	(13,028)	1,962
Unit-based compensation	692	692
Tax withholdings and associated payments on vested SMLP LTIP awards	(213)	(213)
Ending balance at Sep. 30, 2022	$ 791,821	$ 708,569	$ 83,252

SEGMENT INFORMATION (Tables)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Schedule of Reconciliation of Assets from Segment to Consolidated

Assets by reportable segment follow.


	September 30, 2022		December 31, 2021
	(In thousands)
Assets:
Northeast	$	600,394	$	623,224
Rockies	529,004		592,148
Permian	303,474		458,988
Piceance	489,474		524,218
Barnett	301,873		315,055
Total reportable segment assets	2,224,219		2,513,633
Corporate and Other	15,453		8,829
Total assets	$	2,239,672	$	2,522,462

Schedule of Reconciliation of Revenue from Segments to Consolidated

Segment adjusted EBITDA by reportable segment follows.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands)
Reportable segment adjusted EBITDA
Northeast	$	19,353	$	20,720	$	57,989	$	64,274
Rockies	14,262		18,722		43,991		49,606
Permian	4,882		1,422		13,848		4,014
Piceance	14,249		18,908		45,367		60,266
Barnett	7,864		9,637		24,397		26,542
Total of reportable segments' measures of profit	$	60,610	$	69,409	$	185,592	$	204,702

Schedule of Reconciliation Of Net Income To Adjusted EBITDA

A reconciliation of income or loss before income taxes and income from equity method investees to total of reportable segments' measures of profit follows.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands)
Reconciliation of income (loss) before income taxes and
income from equity method investees to total of
reportable segments' measures of profit:
Income (loss) before income taxes and income from equity method investees	$	(13,590)	$	4,850	$	(113,452)	$	(10,779)
Add:
Corporate and Other expense	2,151		11,758		11,778		61,238
Interest expense	24,932		15,530		73,982		44,985
Depreciation and amortization (1)	29,076		31,226		90,101		88,570
Proportional adjusted EBITDA for equity method investees	11,949		6,690		33,807		20,403
Adjustments related to capital reimbursement activity	(1,517)		(1,549)		(4,823)		(5,019)
Unit-based and noncash compensation	692		868		2,964		3,883
Gain on asset sales, net	(99)		(212)		(409)		(352)
Long-lived asset impairment	7,016		248		91,644		1,773
Total of reportable segments' measures of profit	$	60,610	$	69,409	$	185,592	$	204,702

________

(1) Includes the amortization expense associated with our favorable gas gathering contracts as reported in other revenues.