Archrock (AROC) 10-Q 2 Nov 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Oct. 26, 2021
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Commission File Number	001-33666
Entity Registrant Name	Archrock, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-3204509
Entity Street Address	9807 Katy Freeway
Entity Suite Number	Suite 100
Entity City	Houston
Entity State	TX
Entity Postal Zip Code	77024
City Area Code	281
Local Phone Number	836-8000
Title of each class	Common stock, $0.01 par value per share
Trading Symbol	AROC
Name of exchange on which registered	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		154,049,828
Entity Central Index Key	0001389050
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 3,488	$ 1,097
Accounts receivable, trade, net of allowance	108,936	104,425
Inventory	66,630	63,670
Other current assets	7,652	12,819
Total current assets	186,706	182,011
Property, plant and equipment, net	2,252,226	2,389,674
Operating lease ROU assets	18,256	19,236
Intangible assets, net	50,815	61,531
Contract costs, net	24,375	29,216
Deferred tax assets	48,227	56,934
Other assets	27,502	30,084
Noncurrent assets associated with discontinued operations	10,117	11,036
Total assets	2,618,224	2,779,722
Current liabilities:
Accounts payable, trade	44,685	30,819
Accrued liabilities	104,753	76,993
Deferred revenue	3,985	3,880
Total current liabilities	153,423	111,692
Long-term debt	1,516,135	1,688,867
Operating lease liabilities	16,454	16,925
Deferred tax liabilities	801	725
Other liabilities	19,496	18,088
Noncurrent liabilities associated with discontinued operations	7,868	7,868
Total liabilities	1,714,177	1,844,165
Commitments and contingencies
Equity:
Preferred stock: $0.01 par value per share, 50,000,000 shares authorized, zero issued
Common stock: $0.01 par value per share, 250,000,000 shares authorized, 161,459,405 and 160,014,960 shares issued, respectively	1,614	1,600
Additional paid-in capital	3,437,298	3,424,624
Accumulated other comprehensive loss	(2,028)	(5,006)
Accumulated deficit	(2,446,755)	(2,401,988)
Treasury stock: 7,402,188 and 7,052,769 common shares, at cost, respectively	(86,082)	(83,673)
Total equity	904,047	935,557
Total liabilities and equity	$ 2,618,224	$ 2,779,722

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 3,057	$ 3,370
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	161,459,405	160,014,960
Treasury stock, common shares (in shares)	7,402,188	7,052,769

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 195,166	$ 205,631	$ 586,212	$ 675,644
Total cost of sales (excluding depreciation and amortization)	91,932	86,153	267,957	291,871
Selling, general and administrative	28,839	18,681	80,000	78,052
Depreciation and amortization	45,280	47,279	135,185	145,950
Long-lived and other asset impairment	5,121	10,727	15,154	72,132
Goodwill impairment				99,830
Restructuring charges	313	2,900	1,953	7,036
Interest expense	25,508	25,221	82,711	80,664
Debt extinguishment loss				3,971
Gain on sale of assets, net	(15,393)	(9,146)	(29,549)	(11,073)
Other (income) expense, net	337	(324)	(1,634)	(1,317)
Income (loss) before income taxes	13,229	24,140	34,435	(91,472)
Provision for (benefit from) income taxes	3,925	5,808	12,210	(18,236)
Net income (loss)	$ 9,304	$ 18,332	$ 22,225	$ (73,236)
Basic net income (loss) per common share (in dollars per share)	$ 0.06	$ 0.12	$ 0.14	$ (0.49)
Diluted net income (loss) per common share (in dollars per share)	$ 0.06	$ 0.12	$ 0.14	$ (0.49)
Weighted average common shares outstanding:
Basic (in shares)	152,158	150,974	151,615	150,730
Diluted (in shares)	152,297	151,038	151,769	150,730
Contract Operations
Revenues	$ 158,911	$ 175,223	$ 488,810	$ 570,146
Total cost of sales (excluding depreciation and amortization)	61,280	60,444	184,032	202,485
Aftermarket Services
Revenues	36,255	30,408	97,402	105,498
Total cost of sales (excluding depreciation and amortization)	$ 30,652	$ 25,709	$ 83,925	$ 89,386

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income
Net income (loss)	$ 9,304	$ 18,332	$ 22,225	$ (73,236)
Other comprehensive income (loss), net of tax:
Interest rate swap gain (loss), net of reclassifications to earnings	585	935	2,547	(4,586)
Amortization of dedesignated interest rate swaps	431		431
Total other comprehensive income (loss), net of tax	1,016	935	2,978	(4,586)
Comprehensive income (loss)	$ 10,320	$ 19,267	$ 25,203	$ (77,822)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated DeficitCumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit	Treasury Stock	ATM Agreement	Cumulative Effect, Period of Adoption, Adjustment	Total
Beginning balance at Dec. 31, 2019	$ 1,587	$ 3,412,509	$ (1,387)	$ 166	$ (2,244,877)	$ (81,869)		$ 166	$ 1,085,963
Stockholders' Equity, Beginning, shares at Dec. 31, 2019	158,636,918					(6,702,602)
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased						$ (1,794)			(1,794)
Treasury stock purchased, shares						(235,079)
Cash dividends					(66,655)				(66,655)
Shares issued under ESPP	$ 1	521							522
Shares issued under ESPP (in shares)	140,606
Stock-based compensation, net of forfeitures	$ 11	8,616							8,627
Stock-based compensation, net of forfeitures, shares	1,193,832					(64,483)
Contribution from Exterran Corporation		678							678
Comprehensive income (loss)
Net income (loss)					(73,236)				(73,236)
Interest rate swap gain (loss), net of reclassifications to earnings			(4,586)						(4,586)
Ending balance at Sep. 30, 2020	$ 1,599	3,422,324	(5,973)		(2,384,602)	$ (83,663)			949,685
Stockholders' Equity, Ending, shares at Sep. 30, 2020	159,971,356					(7,002,164)
Beginning balance at Jun. 30, 2020	$ 1,598	3,419,512	(6,908)		(2,380,626)	$ (82,703)			950,873
Stockholders' Equity, Beginning, shares at Jun. 30, 2020	159,810,336					(6,860,984)
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased						$ (960)			(960)
Treasury stock purchased, shares						(138,922)
Cash dividends					(22,308)				(22,308)
Shares issued under ESPP		155							155
Shares issued under ESPP (in shares)	30,351
Stock-based compensation, net of forfeitures	$ 1	2,657							2,658
Stock-based compensation, net of forfeitures, shares	130,669					(2,258)
Comprehensive income (loss)
Net income (loss)					18,332				18,332
Interest rate swap gain (loss), net of reclassifications to earnings			935						935
Ending balance at Sep. 30, 2020	$ 1,599	3,422,324	(5,973)		(2,384,602)	$ (83,663)			949,685
Stockholders' Equity, Ending, shares at Sep. 30, 2020	159,971,356					(7,002,164)
Beginning balance at Dec. 31, 2020	$ 1,600	3,424,624	(5,006)		(2,401,988)	$ (83,673)			935,557
Stockholders' Equity, Beginning, shares at Dec. 31, 2020	160,014,960					(7,052,769)
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased						$ (2,409)			(2,409)
Treasury stock purchased, shares						(277,316)
Cash dividends					(66,992)				(66,992)
Shares issued under ESPP		546							546
Shares issued under ESPP (in shares)	66,541
Stock-based compensation, net of forfeitures	$ 10	8,731							8,741
Stock-based compensation, net of forfeitures, shares	1,020,756					(72,103)
Net proceeds from issuance of common stock	$ 4	3,397							3,401
Net proceeds from issuance of common stock (in shares)	357,148						357,148
Comprehensive income (loss)
Net income (loss)					22,225				22,225
Interest rate swap gain (loss), net of reclassifications to earnings			2,547						2,547
Amortization of dedesignated interest rate swaps			431						431
Ending balance at Sep. 30, 2021	$ 1,614	3,437,298	(2,028)		(2,446,755)	$ (86,082)			904,047
Stockholders' Equity, Ending, shares at Sep. 30, 2021	161,459,405					(7,402,188)
Beginning balance at Jun. 30, 2021	$ 1,613	3,434,224	(3,044)		(2,433,553)	$ (85,419)			913,821
Stockholders' Equity, Beginning, shares at Jun. 30, 2021	161,339,554					(7,278,449)
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased						$ (663)			(663)
Treasury stock purchased, shares						(92,540)
Cash dividends					(22,506)				(22,506)
Shares issued under ESPP		175							175
Shares issued under ESPP (in shares)	22,425
Stock-based compensation, net of forfeitures	$ 1	2,899							2,900
Stock-based compensation, net of forfeitures, shares	97,426					(31,199)
Comprehensive income (loss)
Net income (loss)					9,304				9,304
Interest rate swap gain (loss), net of reclassifications to earnings			585						585
Amortization of dedesignated interest rate swaps			431						431
Ending balance at Sep. 30, 2021	$ 1,614	$ 3,437,298	$ (2,028)		$ (2,446,755)	$ (86,082)			$ 904,047
Stockholders' Equity, Ending, shares at Sep. 30, 2021	161,459,405					(7,402,188)

CONSOLIDATED STATEMENTS OF EQUI

CONSOLIDATED STATEMENTS OF EQUITY (Parentheticals) - $ / shares	3 Months Ended							9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity
Dividend declared per common stock (in dollars per share)	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.435	$ 0.435

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 22,225	$ (73,236)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	135,185	145,950
Long-lived and other asset impairment	15,154	72,132
Goodwill impairment		99,830
Inventory write-downs	621	915
Amortization of operating lease ROU assets	2,922	2,555
Amortization of deferred financing costs	8,839	4,179
Amortization of debt discount		187
Amortization of debt premium	(1,504)
Amortization of dedesignated interest rate swaps	431
Debt extinguishment loss		3,971
Interest rate swaps	2,866	2,094
Stock-based compensation expense	8,741	8,423
Non-cash restructuring charges		1,660
Provision for credit losses	151	2,235
(Gain) loss on sale of assets, net	(10,604)	1,402
Gain on sale of business	(18,945)	(12,475)
Deferred income tax provision (benefit)	11,778	(18,288)
Amortization of contract costs	15,523	20,286
Deferred revenue recognized in earnings	(8,081)	(17,183)
Change in assets and liabilities, net of acquisition:
Accounts receivable, trade	(2,133)	31,134
Inventory	(5,994)	3,244
Other assets	1,326	(23,539)
Contract costs, net	(11,481)	(10,390)
Accounts payable and other liabilities	33,626	10,679
Deferred revenue	8,167	10,696
Other	(88)	373
Net cash provided by operating activities	208,725	266,834
Cash flows from investing activities:
Capital expenditures	(70,881)	(130,343)
Proceeds from sale of business	83,075	32,914
Proceeds from sale of property, plant and equipment and other assets	24,683	14,043
Proceeds from insurance and other settlements	977	1,391
Net cash provided by (used in) investing activities	37,854	(81,995)
Cash flows from financing activities:
Borrowings of long-term debt	522,751	871,500
Repayments of long-term debt	(695,751)	(988,500)
Payments for debt issuance costs	(2,451)	(943)
Payments for settlement of interest rate swaps that include financing elements	(3,283)	(1,856)
Dividends paid to stockholders	(66,992)	(66,655)
Net proceeds from issuance of common stock	3,401
Proceeds from stock issued under ESPP	546	522
Purchases of treasury stock	(2,409)	(1,794)
Contribution from Exterran Corporation		678
Net cash used in financing activities	(244,188)	(187,048)
Net increase (decrease) in cash and cash equivalents	2,391	(2,209)
Cash and cash equivalents, beginning of period	1,097	3,685
Cash and cash equivalents, end of period	$ 3,488	1,476
Supplemental disclosure of non-cash investing and financing transactions:
Non-cash consideration received in July 2020 Disposition		$ 6,500

Organization and Basis of Prese

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Description of Business and Basis of Presentation
Organization and Basis of Presentation	1. Description of Business and Basis of Presentation We are an energy infrastructure company with a pure-play focus on midstream natural gas compression. We are the leading provider of natural gas compression services to customers in the oil and natural gas industry throughout the U.S. and a leading supplier of aftermarket services to customers that own compression equipment in the U.S. We operate in two business segments: contract operations and aftermarket services. Our predominant segment, contract operations, primarily includes designing, sourcing, owning, installing, operating, servicing, repairing and maintaining our owned fleet of natural gas compression equipment to provide natural gas compression services to our customers. In our aftermarket services business, we sell parts and components and provide operations, maintenance, overhaul and reconfiguration services to customers who own compression equipment. The accompanying unaudited condensed consolidated financial statements included herein have been prepared in accordance with GAAP and the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP are not required in these interim financial statements and have been condensed or omitted. Management believes that the information furnished reflects all normal recurring adjustments necessary to fairly present our consolidated financial position, results of operations and cash flows for the periods indicated. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements presented in our 2020 Form 10-K, which contains a more comprehensive summary of our accounting policies. The interim results reported herein are not necessarily indicative of results for a full year. Certain prior year amounts have been reclassified to conform to the current year presentation.

Recent Accounting Developments

Recent Accounting Developments	9 Months Ended
	Sep. 30, 2021
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Developments	2. Recent Accounting Developments Accounting Standards Updates Implemented Reference Rate Reform On June 10, 2021, we prospectively adopted ASU 2020-04, which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference LIBOR or another reference rate expected to be discontinued as a result of reference rate reform. ASU 2020-04 is effective for all entities as of March 12, 2020 through December 31, 2022. Entities may elect to apply the amendments for contract modifications as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020. On June 10, 2021, we amended one of our interest rate swap agreements and determined that the modifications meet the criteria for the optional expedients and exceptions, which allow us to forego dedesignation of the hedging relationship and to subsequently assess effectiveness on a qualitative basis. The adoption of ASU 2020-04 did not have a material impact on our consolidated financial statements. In the first quarter, we evaluated Amendment No. 3 to our Credit Facility and determined that ASU 2020-04 was not applicable. We will continue to assess any modifications to our interest rate swap and Credit Facility agreements during the effective period of this update and will apply the amendments as applicable. ​

Business Transactions

Business Transactions	9 Months Ended
	Sep. 30, 2021
Business Transactions
Business Transactions	3. Business Transactions July 2021 Dispositions In July 2021, we completed sales of certain contract operations customer service agreements and approximately 575 compressors, comprising approximately 100,000 horsepower, used to provide compression services under those agreements, as well as other assets used to support the operations. We allocated customer-related and contract-based intangible assets based on a ratio of the horsepower sold relative to the total horsepower of the asset group. We received cash consideration of $60.3 million for the sales and recorded gains on the sales of $13.0 million in gain on sale of assets, net in our condensed consolidated statements of operations during the three and nine months ended September 30, 2021. Remaining cash consideration from the sales of $1.3 million is expected to be received in the fourth quarter of 2021. February 2021 Disposition In February 2021, we completed the sale of certain contract operations customer service agreements and approximately 300 compressors, comprising approximately 40,000 horsepower, used to provide compression services under those agreements as well as other assets used to support the operations. We allocated customer-related and contract-based intangible assets based on a ratio of the horsepower sold relative to the total horsepower of the asset group. We recorded a gain on the sale of $6.0 million in gain on sale of assets, net in our condensed consolidated statements of operations during the nine months ended September 30, 2021. July 2020 Disposition In July 2020, we completed the sale of the turbocharger business included within our aftermarket services segment . In connection with the sale, we entered into a supply agreement to purchase a minimum amount of turbocharger goods and services over a two-year term. In addition to cash of $9.5 million received upon closing, an additional $3.0 million was received on the first anniversary of the closing date in July 2021, and $3.5 million is being received through the purchase of turbocharger goods and services under the supply agreement. We received $2.5 million during the nine months ended September 30, 2021 and a total of $3.2 million since sale completion under the supply agreement. We recognized a gain on the sale of $9.3 million in gain on sale of assets, net in our condensed consolidated statements of operations during the three and nine months ended September 30, 2020. March 2020 Disposition In March 2020, we completed the sale of certain contract operations customer service agreements and approximately 200 compressors, comprising approximately 35,000 horsepower, used to provide compression services under those agreements as well as other assets used to support the operations. We allocated customer-related and contract-based intangible assets and goodwill based on a ratio of the horsepower sold relative to the total horsepower of the asset group. We recognized a gain on the sale of $3.2 million in gain on sale of assets, net in our condensed consolidated statements of operations during the nine months ended September 30, 2020.

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	4. Discontinued Operations In 2015 we completed the Spin-off. In order to effect the Spin-off and govern our relationship with Exterran Corporation after the Spin-off, we entered into several agreements with Exterran Corporation, including a tax matters agreement, which governs the respective rights, responsibilities and obligations of Exterran Corporation and us with respect to certain tax matters. As of both September 30, 2021 and December 31, 2020, we had $7.9 million of unrecognized tax benefits (including interest and penalties) related to Exterran Corporation operations prior to the Spin-off recorded to noncurrent liabilities associated with discontinued operations in our condensed consolidated balance sheets. We had an offsetting indemnification asset of $7.9 million related to these unrecognized tax benefits recorded to noncurrent assets associated with discontinued operations as of both September 30, 2021 and December 31, 2020. The following table presents the balance sheets for our discontinued operations: ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Other assets ​ $ 7,868 ​ $ 7,868 Deferred tax assets ​ ​ 2,249 ​ ​ 3,168 Total assets associated with discontinued operations ​ $ 10,117 ​ $ 11,036 ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities ​ $ 7,868 ​ $ 7,868 Total liabilities associated with discontinued operations ​ $ 7,868 ​ $ 7,868 ​

Inventory

Inventory	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Inventory	5. Inventory ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Parts and supplies ​ $ 59,478 ​ $ 57,433 Work in progress ​ 7,152 ​ 6,237 Inventory ​ $ 66,630 ​ $ 63,670 ​

Property, Plant and Equipment,

Property, Plant and Equipment, Net	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	6. Property, Plant and Equipment, net ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Compression equipment, facilities and other fleet assets ​ $ 3,269,801 ​ $ 3,439,432 Land and buildings ​ 43,373 ​ 45,167 Transportation and shop equipment ​ 95,210 ​ 106,868 Computer hardware and software ​ 84,733 ​ 84,680 Other ​ 24,496 ​ 14,457 Property, plant and equipment ​ 3,517,613 ​ 3,690,604 Accumulated depreciation ​ (1,265,387) ​ (1,300,930) Property, plant and equipment, net ​ $ 2,252,226 ​ $ 2,389,674 ​

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2021
Goodwill
Goodwill	7. Goodwill Our goodwill was recognized in connection with the Elite Acquisition and represents the excess of consideration transferred over the fair value of the assets and liabilities acquired. All of the goodwill was allocated to our contract operations reporting unit. We review the carrying amount of our goodwill in the fourth quarter of every year, or whenever indicators of potential impairment exist, to determine if the carrying amount of our contract operations reporting unit exceeds its fair value, including the goodwill. Beginning in the first quarter of 2020, the COVID-19 pandemic caused a significant deterioration in global macroeconomic conditions, including a collapse in the demand for oil coupled with an oversupply of oil, which commenced substantial spending cuts by our customers and a decline in production. This global response to the pandemic significantly impacted our market capitalization and estimates of future revenues and cash flows, which triggered the need to perform a quantitative test of the fair value of our contract operations reporting unit as of March 31, 2020. The quantitative test determined that the carrying amount of our contract operations reporting unit exceeded its fair value and we recorded a goodwill impairment loss of $99.8 million during the first quarter of 2020. Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions, which have a significant impact on the fair value determined. We determined the fair value of our reporting unit using an equal weighting of both the expected present value of future cash flows and a market approach. The present value of future cash flows was estimated using our most recent forecast and the weighted average cost of capital. The market approach uses a market multiple on the earnings before interest expense, provision for income taxes and depreciation and amortization expense of comparable peer companies. Significant estimates for our reporting unit included in our impairment analysis were our cash flow forecasts, our estimate of the market’s weighted average cost of capital and market multiples.

Hosting Arrangements

Hosting Arrangements	9 Months Ended
	Sep. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Hosting Arrangements	8. Hosting Arrangements In the fourth quarter of 2018 we began a process and technology transformation project that will, among other things, upgrade or replace our existing ERP, supply chain and inventory management systems and expand the remote monitoring capabilities of our compression fleet. Included in this project are hosting arrangements that are service contracts related to the cloud migration of our ERP system and cloud services for our new mobile workforce, telematics and inventory management tools. As of September 30, 2021 and December 31, 2020, we had $10.8 million and $7.7 million, respectively, of capitalized implementation costs related to our hosting arrangements that are service contracts included in other assets in our condensed consolidated balance sheets. Accumulated amortization was $0.6 million and $0.3 million at September 30, 2021 and December 31, 2020, respectively. We recorded $0.1 million of amortization expense to SG&A in our condensed consolidated statements of operations during each of the three months ended September 30, 2021 and 2020, and $0.3 million and $0.2 million during the nine months ended September 30, 2021 and 2020, respectively. During the three and nine months ended September 30, 2020, we impaired $1.6 million of capitalized implementation costs related to the hosting arrangements of the mobile workforce component of our project due to the termination of the agreement, which was included in long-lived and other asset impairment in our condensed consolidated statements of operations.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Long-Term Debt	9. Long-Term Debt ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Credit Facility ​ $ 220,000 ​ $ 393,000 ​ ​ ​ ​ ​ ​ ​ 2028 Notes ​ ​ ​ ​ ​ ​ Principal ​ 800,000 ​ 800,000 Debt premium, net of amortization ​ ​ 13,037 ​ 14,541 Deferred financing costs, net of amortization ​ (10,821) ​ (11,766) ​ ​ 802,216 ​ 802,775 ​ ​ ​ ​ ​ ​ ​ 2027 Notes ​ ​ ​ ​ ​ ​ Principal ​ ​ 500,000 ​ 500,000 Deferred financing costs, net of amortization ​ ​ (6,081) ​ (6,908) ​ ​ ​ 493,919 ​ 493,092 ​ ​ ​ ​ ​ ​ ​ Long-term debt ​ $ 1,516,135 ​ $ 1,688,867 ​ Credit Facility As of September 30, 2021, there were $12.5 million letters of credit outstanding under the Credit Facility and the applicable margin on borrowings outstanding was 2.4%. The weighted average annual interest rate on the outstanding balance under the Credit Facility, excluding the effect of interest rate swaps, was 2.6% and 2.7% at September 30, 2021 and December 31, 2020, respectively. We incurred $0.5 million and $0.4 million in commitment fees on the daily unused amount of the Credit Facility during the three months ended September 30, 2021 and 2020, respectively, and $1.5 million during each of the nine months ended September 30, 2021 and 2020. We must maintain certain consolidated financial ratios, as defined in our Credit Facility agreement. As of September 30, 2021, the ratio requirements did not constrain our undrawn capacity and as such, $517.5 million was available for additional borrowings. As of September 30, 2021, we were in compliance with all covenants under the Credit Facility agreement. Amendment No. 3 On February 22, 2021, we amended our Credit Facility to, among other things: ● reduce the aggregate revolving commitment from $1.25 billion to $750.0 million, and ● adjust the maximum Senior Secured Debt to EBITDA and Total Debt to EBITDA ratios, as defined in the Credit Facility agreement, to the following: ​ ​ ​ ​ Senior Secured Debt to EBITDA 3.00 to 1.0 Total Debt to EBITDA Through fiscal year 2022 ​ 5.75 to 1.0 January 1, 2023 through September 30, 2023 5.50 to 1.0 Thereafter (1) 5.25 to 1.0 (1) Subject to a temporary increase to 5.50 to 1.0 for any quarter during which an acquisition satisfying certain thresholds is completed and for the two quarters immediately following such quarter. We incurred $1.8 million in transaction costs related to Amendment No. 3, which were included in other assets in our condensed consolidated balance sheets and are being amortized over the remaining term of the Credit Facility. In addition, we wrote off $4.9 million of unamortized deferred financing costs as a result of the amendment, which was recorded to interest expense in our condensed consolidated statements of operations during the nine months ended September 30, 2021. 2022 Notes Redemption In April 2020, the 2022 Notes were redeemed at 100% of their $350.0 million aggregate principal amount plus accrued and unpaid interest of $10.5 million with borrowings under the Credit Facility. A debt extinguishment loss of $4.0 million related to the redemption was recognized during the nine months ended September 30, 2020.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss).
Accumulated Other Comprehensive Income (Loss)	10. Accumulated Other Comprehensive Loss Components of comprehensive income (loss) are net income (loss) and all changes in equity during a period except those resulting from transactions with owners. Our accumulated other comprehensive loss consists of changes in the fair value of our interest rate swap derivative instruments, net of tax. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Beginning accumulated other comprehensive loss ​ $ (3,044) ​ $ (6,908) ​ $ (5,006) ​ $ (1,387) Other comprehensive income (loss), net of tax: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss recognized in other comprehensive income (loss), net of tax benefit of $123, $18, $141 and $1,764, respectively ​ (458) ​ (69) ​ (529) ​ (6,635) Loss reclassified from accumulated other comprehensive loss to interest expense, net of tax benefit of $393, $267, $933 and $545, respectively ​ 1,474 ​ 1,004 ​ 3,507 ​ 2,049 Total other comprehensive income (loss) ​ 1,016 ​ 935 ​ 2,978 ​ (4,586) Ending accumulated other comprehensive loss ​ $ (2,028) ​ $ (5,973) ​ $ (2,028) ​ $ (5,973) ​ See Note 17 (“Derivatives”) for further details on our interest rate swap derivative instruments.

Equity

Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Equity	11. Equity At-the-Market Continuous Equity Offering Program On February 23, 2021, we entered into the ATM Agreement, pursuant to which we may offer and sell shares of our common stock from time to time for an aggregate offering price of up to $50.0 million. We intend to use the net proceeds of these offerings, after deducting sales agent fees and offering expenses, for general corporate purposes. Offerings of common stock pursuant to the ATM Agreement will terminate upon the earlier of (i) the sale of all shares of common stock subject to the ATM Agreement or (ii) the termination of the ATM Agreement by us or by each of the sales agents. Any sales agent may also terminate the ATM Agreement but only with respect to itself During the nine months ended September 30, 2021, we sold 357,148 shares of common stock for net proceeds of $3.4 million pursuant to the ATM Agreement. Cash Dividends The following table summarizes our dividends declared and paid in each of the quarterly periods of 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ Declared Dividends Dividends Paid ​ per Common Share (in thousands) 2021 ​ ​ Q3 ​ $ 0.145 ​ $ 22,506 Q2 ​ ​ 0.145 ​ ​ 22,331 Q1 ​ ​ 0.145 ​ ​ 22,155 ​ ​ ​ ​ ​ ​ ​ 2020 ​ ​ Q4 ​ $ 0.145 ​ $ 22,177 Q3 ​ 0.145 ​ 22,308 Q2 ​ 0.145 ​ 22,176 Q1 ​ 0.145 ​ 22,171 ​ On October 28, 2021, our Board of Directors declared a quarterly dividend of $0.145 per share of common stock to be paid on November 16, 2021 to stockholders of record at the close of business on November 9, 2021.

Revenue from Contract with Cust

Revenue from Contract with Customers	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	12. Revenue from Contracts with Customers The following table presents our revenue from contracts with customers by segment (see Note 22 (“Segments”)) and disaggregated by revenue source: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Contract operations: ​ ​ ​ ​ ​ ​ ​ ​ 0 ― 1,000 horsepower per unit ​ $ 41,576 ​ $ 51,409 ​ $ 134,413 ​ $ 175,877 1,001 ― 1,500 horsepower per unit ​ 66,138 ​ 73,205 ​ 201,454 ​ 236,083 Over 1,500 horsepower per unit ​ 51,018 ​ 50,142 ​ 152,360 ​ 156,351 Other (1) ​ 179 ​ 467 ​ 583 ​ 1,835 Total contract operations revenue (2) ​ 158,911 ​ 175,223 ​ 488,810 ​ 570,146 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Aftermarket services: ​ ​ ​ ​ Services ​ 19,249 ​ 17,961 ​ 53,149 ​ 62,492 OTC parts and components sales ​ 17,006 ​ 12,447 ​ 44,253 ​ 43,006 Total aftermarket services revenue (3) ​ 36,255 ​ 30,408 ​ 97,402 ​ 105,498 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total revenue ​ $ 195,166 ​ $ 205,631 ​ $ 586,212 ​ $ 675,644 (1) Primarily relates to fees associated with owned non-compression equipment. (2) Includes $0.7 million and $1.4 million for the three months ended September 30, 2021 and 2020, respectively, and $3.1 million and $4.5 million for the nine months ended September 30, 2021 and 2020, respectively, related to billable maintenance on owned compressors that was recognized at a point in time. All other contract operations revenue is recognized over time. (3) All services revenue within aftermarket services is recognized over time. All OTC parts and components sales revenue is recognized at a point in time. Performance Obligations As of September 30, 2021, we had $268.2 million of remaining performance obligations related to our contract operations segment, which will be recognized through 2026 as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) 2021 2022 2023 2024 2025 ​ 2026 Total Remaining performance obligations ​ $ 1,093 ​ $ 95,890 ​ $ 128,521 ​ $ 32,787 ​ $ 9,148 ​ $ 759 ​ $ 268,198 ​ We do not disclose the aggregate transaction price for the remaining performance obligations for aftermarket services as there are no contracts with customers with an original contract term that is greater than one year. Contract Assets and Liabilities Contract Assets As of September 30, 2021 and December 31, 2020, our receivables from contracts with customers, net of allowance for credit losses, were $95.3 million and $95.6 million, respectively. Allowance for Credit Losses Trade accounts receivable are due from companies of varying size engaged principally in oil and natural gas activities throughout the U.S. We review the financial condition of customers prior to extending credit and generally do not obtain collateral for trade receivables. Payment terms are on a short-term basis and in accordance with industry practice. We consider this credit risk to be limited due to these companies’ financial resources, the nature of the products and services we provide and the terms of our customer agreements. Due to the short-term nature of our trade receivables, we consider the amortized cost to be the same as the carrying amount of the receivable, excluding the allowance for credit losses. We recognize an allowance for credit losses when a receivable is recorded, even when the risk of loss is remote. We utilize an aging schedule to determine our allowance for credit losses and measure expected credit losses on a collective (pool) basis when similar risk characteristics exist. We rely primarily on ratings assigned by external rating agencies and credit monitoring services to assess credit risk and aggregate customers first by low, medium or high risk asset pools, and then by delinquency status. We also consider the internal risk associated with geographic location and the services we provide to the customer when determining asset pools. If a customer does not share similar risk characteristics with other customers, we evaluate the customer’s outstanding trade receivables for expected credit losses on an individual basis. Trade receivables evaluated individually are not included in our collective assessment. Each reporting period, we reassess our customers’ risk profiles and determine the appropriate asset pool classification, or perform individual assessments of expected credit losses, based on the customers’ risk characteristics at the reporting date. The contractual life of our trade receivables is primarily 30 days based on the payment terms specified in the contract. Contract operations services are generally billed monthly at the beginning of the month in which service is being provided. Aftermarket services billings typically occur when parts are delivered or service is completed. Loss rates are separately determined for each asset pool based on the length of time a trade receivable has been outstanding. We analyze two years of internal historical loss data, including the effects of prepayments, write-offs and subsequent recoveries, to determine our historical loss experience. Our historical loss information is a relevant data point for estimating credit losses, as the data closely aligns with trade receivables due from our customers. Ratings assigned by external rating agencies and credit monitoring services consider past performance and forecasts of future economic conditions in assessing credit risk. We routinely update our historical loss data to reflect our customers’ current risk profile, to ensure the historical data and loss rates are relevant to the pool of assets for which we are estimating expected credit losses. Our allowance for credit losses balance changed as follows during the nine months ended September 30, 2021: ​ ​ ​ ​ ​ (in thousands) ​ ​ ​ Balance at December 31, 2020 $ 3,370 Provision for credit losses ​ ​ 151 Write-offs charged against allowance ​ ​ (464) Balance at September 30, 2021 ​ $ 3,057 ​ Contract Liabilities Freight billings to customers for the transport of compression assets, customer-specified modifications of compression assets and milestone billings on aftermarket services often result in a contract liability. Our contract liabilities were $4.6 million as of both September 30, 2021 and December 31, 2020, and were included in deferred revenue and other liabilities in our condensed consolidated balance sheets. During the nine months ended September 30, 2021, we deferred revenue of $8.2 million and recognized $8.1 million as revenue. The revenue recognized and deferred during the period primarily related to freight billings and milestone billings on aftermarket services.

Long-Lived and Other Asset Impa

Long-Lived and Other Asset Impairment	9 Months Ended
	Sep. 30, 2021
Long-Lived and Other Asset Impairment
Long-Lived and Other Asset Impairment	13. Long-Lived and Other Asset Impairment We review long-lived assets, including property, plant and equipment and identifiable intangibles that are being amortized, for impairment whenever events or changes in circumstances, including the removal of compressors from our active fleet, indicate that the carrying amount of an asset may not be recoverable. In the first quarter of 2020, we determined that the impairment of our contract operations reporting unit’s goodwill was an indicator of potential impairment of the carrying amount of our long-lived assets, including our compressor fleet and associated customer and contract-based intangible assets. Accordingly, we performed a quantitative impairment test of our long-lived assets, by which we determined that they were not also impaired. No similar impairment has been indicated subsequent to the first quarter of 2020. Compression Fleet We periodically review the future deployment of our idle compression assets for units that are not of the type, configuration, condition, make or model that are cost efficient to maintain and operate. Based on these reviews, we determine that certain idle compressors should be retired from the active fleet. The retirement of these units from the active fleet triggers a review of these assets for impairment and as a result of our review, we may record an asset impairment to reduce the book value of each unit to its estimated fair value. The fair value of each unit is estimated based on the expected net sale proceeds compared to other fleet units we recently sold, a review of other units recently offered for sale by third parties or the estimated component value of the equipment we plan to use. In connection with our review of our idle compression assets, we evaluate for impairment idle units that were culled from our fleet in prior years and are available for sale. Based on that review, we may reduce the expected proceeds from disposition and record additional impairment to reduce the book value of each unit to its estimated fair value. The following table presents the results of our compression fleet impairment review as recorded to our contract operations segment: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (dollars in thousands) 2021 2020 2021 2020 Idle compressors retired from the active fleet ​ 60 ​ 105 ​ 175 ​ 640 Horsepower of idle compressors retired from the active fleet ​ 24,000 ​ 28,000 ​ 61,000 ​ 235,000 Impairment recorded on idle compressors retired from the active fleet ​ $ 5,120 ​ $ 8,137 ​ $ 14,964 ​ $ 69,542 ​ Other Impairment During the three and nine months ended September 30, 2020, $1.7 million of capitalized implementation and unamortized prepaid costs related to the mobile workforce component of our multi-year process and technology transformation project was impaired. See Note 8 (“Hosting Arrangements”) for further details.

Restructuring Charges

Restructuring Charges	9 Months Ended
	Sep. 30, 2021
Restructuring Charges
Restructuring Charges	14. Restructuring Charges During the first quarter of 2020, we completed restructuring activities to further streamline our organization and more fully align our teams to improve our customer service and profitability. We incurred severance costs of $1.7 million related to these activities during the first quarter of 2020. No additional costs will be incurred for this organizational restructuring. In response to the decreased activity level of our customers that resulted from the COVID-19 pandemic beginning in the second quarter of 2020, we incurred severance costs of $7.0 million to right-size our business. No additional costs will be incurred under this restructuring plan. During the third quarter of 2020, a plan to dispose of certain non-core properties was approved by management. We have incurred $1.5 million of restructuring costs as a result of these property disposals and do not expect to incur additional material property disposal costs under this restructuring plan. During the third quarter of 2021, management approved and initiated a plan to exit a facility no longer deemed economical for our business. Closing costs incurred during the third quarter were not material, however, we expect to incur approximately $0.8 million to complete the exit of this facility in the fourth quarter of 2021. The severance and property disposal costs incurred under the above restructuring plans were recorded to restructuring charges in our condensed consolidated statements of operations. The following table presents restructuring charges incurred by segment: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Contract ​ Aftermarket ​ ​ ​ ​ ​ ​ (in thousands) ​ Operations ​ Services ​ Other (1) ​ Total Three months ended September 30, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pandemic restructuring ​ $ — ​ $ — ​ $ 224 ​ $ 224 Property restructuring - other exit costs ​ ​ — ​ ​ — ​ ​ 19 ​ ​ 19 Other restructuring ​ ​ — ​ ​ — ​ ​ 70 ​ ​ 70 Total restructuring charges ​ $ — ​ $ — ​ $ 313 ​ $ 313 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Organizational restructuring ​ $ (20) ​ $ — ​ $ (13) ​ $ (33) Pandemic restructuring ​ ​ 546 ​ ​ 644 ​ ​ 245 ​ ​ 1,435 Property restructuring ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss on sale ​ ​ — ​ ​ — ​ ​ 915 ​ ​ 915 Impairment loss ​ ​ — ​ ​ — ​ ​ 583 ​ ​ 583 Total property restructuring ​ ​ — ​ ​ — ​ ​ 1,498 ​ ​ 1,498 Total restructuring charges ​ $ 526 ​ $ 644 ​ $ 1,730 ​ $ 2,900 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pandemic restructuring ​ $ 616 ​ $ 145 ​ $ 956 ​ $ 1,717 Property restructuring ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impairment loss ​ ​ — ​ ​ — ​ ​ 9 ​ ​ 9 Other exit costs ​ ​ — ​ ​ — ​ ​ 26 ​ ​ 26 Total property restructuring ​ ​ — ​ ​ — ​ ​ 35 ​ ​ 35 Other restructuring ​ ​ — ​ ​ — ​ ​ 201 ​ ​ 201 Total restructuring charges ​ $ 616 ​ $ 145 ​ $ 1,192 ​ $ 1,953 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Organizational restructuring ​ $ 458 ​ $ 625 ​ $ 612 ​ $ 1,695 Pandemic restructuring ​ ​ 1,932 ​ ​ 931 ​ ​ 980 ​ ​ 3,843 Property restructuring ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss on sale ​ ​ — ​ ​ — ​ ​ 915 ​ ​ 915 Impairment loss ​ ​ — ​ ​ — ​ ​ 583 ​ ​ 583 Total property restructuring ​ ​ — ​ ​ — ​ ​ 1,498 ​ ​ 1,498 Total restructuring charges ​ $ 2,390 ​ $ 1,556 ​ $ 3,090 ​ $ 7,036 (1) Represents expense incurred within our corporate function and not directly attributable to our segments. ​ The following table presents restructuring charges incurred by cost type: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) ​ 2021 ​ 2020 ​ 2021 ​ 2020 Severance costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Organizational restructuring ​ $ — ​ $ (33) ​ $ — ​ $ 1,695 Pandemic restructuring ​ ​ 224 ​ 1,435 ​ 1,717 ​ 3,843 Total severance costs ​ ​ 224 ​ ​ 1,402 ​ ​ 1,717 ​ ​ 5,538 Property disposal costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss on sale ​ ​ — ​ ​ 915 ​ ​ — ​ ​ 915 Impairment loss ​ ​ — ​ ​ 583 ​ ​ 9 ​ ​ 583 Other exit costs ​ ​ 19 ​ ​ — ​ ​ 26 ​ ​ — Total property disposal costs ​ 19 ​ 1,498 ​ 35 ​ 1,498 Other restructuring costs ​ ​ 70 ​ ​ — ​ ​ 201 ​ ​ — Total restructuring charges ​ $ 313 ​ $ 2,900 ​ $ 1,953 ​ $ 7,036 ​

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Taxes
Income Taxes	15. Income Taxes Valuation Allowance The amount of our deferred tax assets considered realizable could be adjusted if projections of future taxable income are reduced or objective negative evidence in the form of a three-year cumulative loss is present or both. Should we no longer have a level of sustained profitability, excluding nonrecurring charges, we will have to rely more on our future projections of taxable income to determine if we have an adequate source of taxable income for the realization of our deferred tax assets, namely net operating loss carryforwards and tax credit carryforwards. This may result in the need to record a valuation allowance against all or a portion of our deferred tax assets. Effective Tax Rate The year-to-date effective tax rate for the nine months ended September 30, 2021 differed significantly from our statutory rate primarily due to unrecognized tax benefits and the limitation on executive compensation. ​ Unrecognized Tax Benefits As of September 30, 2021, we believe it is reasonably possible that $2.8 million of our unrecognized tax benefits, including penalties, interest and discontinued operations, will be reduced prior to September 30, 2022 due to the settlement of audits or the expiration of statutes of limitations or both. However, due to the uncertain and complex application of the tax regulations, it is possible that the ultimate resolution of these matters may result in liabilities that could materially differ from this estimate.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	16. Earnings per Share Basic net income (loss) per common share is computed using the two-class method, which is an earnings allocation formula that determines net income (loss) per share for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. Under the two-class method, basic net income (loss) per common share is determined by dividing net income (loss), after deducting amounts allocated to participating securities, by the weighted average number of common shares outstanding for the period. Participating securities include unvested restricted stock and stock-settled restricted stock units that have nonforfeitable rights to receive dividends or dividend equivalents, whether paid or unpaid. During periods of net loss, only distributed earnings (dividends) are allocated to participating securities, as participating securities do not have a contractual obligation to participate in our undistributed losses. Diluted net income (loss) per common share is computed using the weighted average number of shares outstanding adjusted for the incremental common stock equivalents attributed to outstanding options, performance-based restricted stock units and stock to be issued pursuant to our ESPP unless their effect would be anti-dilutive. The following table shows the calculation for net income (loss) attributable to common stockholders, which is used in the calculation of basic and diluted net income (loss) per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Net income (loss) ​ $ 9,304 ​ $ 18,332 ​ $ 22,225 ​ $ (73,236) Less: Earnings attributable to participating securities ​ (456) ​ (439) ​ (909) ​ (1,083) Net income (loss) attributable to common stockholders ​ $ 8,848 ​ $ 17,893 ​ $ 21,316 ​ $ (74,319) ​ The following table shows the potential shares of common stock that were included in computing diluted net income (loss) per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Weighted average common shares outstanding including participating securities ​ 154,041 ​ 152,973 ​ 153,422 ​ 152,790 Less: Weighted average participating securities outstanding (1,883) (1,999) (1,807) (2,060) Weighted average common shares outstanding used in basic net income (loss) per common share 152,158 150,974 151,615 150,730 Net dilutive potential common shares issuable: ​ On exercise of options and vesting of performance-based restricted stock units 138 ​ 57 152 — On settlement of ESPP shares 1 ​ 7 2 — Weighted average common shares outstanding used in diluted net income (loss) per common share 152,297 151,038 151,769 150,730 ​ The following table shows the potential shares of common stock issuable that were excluded from computing diluted net income (loss) per common share as their inclusion would have been anti-dilutive: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 On exercise of options where exercise price is greater than average market value for the period ​ 15 85 27 102 On exercise of options and vesting of performance-based restricted stock units ​ — ​ — ​ — ​ 57 On settlement of ESPP shares ​ — ​ — ​ — ​ 19 Net dilutive potential common shares issuable ​ 15 ​ 85 ​ 27 ​ 178 ​

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	17. Derivatives We are exposed to market risks associated with changes in the variable interest rate of our Credit Facility. We use derivative instruments to manage our exposure to fluctuations in this variable interest rate and thereby minimize the risks and costs associated with financial activities. We do not use derivative instruments for trading or other speculative purposes. As of September 30, 2021, we had $300.0 million notional value of interest rate swaps outstanding, which expire in March 2022 and were entered into to offset changes in expected cash flows due to fluctuations in the associated variable interest rates. The counterparties to these derivative agreements are major financial institutions. We monitor the credit quality of these financial institutions and do not expect nonperformance by any counterparty, although such nonperformance could have an adverse effect on us. We have no collateral posted for our derivative instruments. During the three months ended September 30, 2021, we dedesignated $125.0 million notional value of our interest rate swaps. The fair value of this interest rate swap immediately prior to dedesignation was a liability of $1.6 million. The associated amount in accumulated other comprehensive loss related to this interest rate swap is being amortized into interest expense over the remaining term of the swap through March 2022. Future changes in the fair value of the dedesignated interest rate swap will be recorded in interest expense. The remaining $175.0 million notional value of our interest rate swaps continue to be designated as cash flow hedging instruments. Changes in the fair value of cash flow hedging instruments are recognized as a component of other comprehensive income (loss) until the hedged transaction affects earnings. At that time, amounts are reclassified into earnings to interest expense, the same statement of operations line item to which the earnings effect of the hedged item is recorded. Cash flows from derivatives designated as hedges are classified in our condensed consolidated statements of cash flows under the same category as the cash flows from the underlying assets, liabilities or anticipated transactions unless the derivative contract contains a significant financing element, in which case, the cash settlements for these derivatives are classified as cash flows from financing activities. We expect the hedging relationship to be highly effective as the interest rate swap terms substantially coincide with the hedged item and are expected to offset changes in expected cash flows due to fluctuations in the variable rate. We estimate that $2.6 million of the deferred pre-tax loss attributable to interest rate swaps included in accumulated other comprehensive loss at September 30, 2021 will be reclassified into earnings as interest expense at then-current values during the next 12 months as the underlying hedged transactions occur. As of September 30, 2021, the weighted average effective fixed interest rate of our interest rate swaps was 1.8%. The following table presents the effect of our derivative instruments on our condensed consolidated balance sheets: ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Interest rate swaps designated as cash flow hedging instruments ​ ​ ​ ​ ​ ​ Accrued liabilities ​ $ 1,502 ​ $ 4,810 Other liabilities ​ — ​ 1,527 Total derivatives designated as cash flow hedging instruments ​ ​ 1,502 ​ ​ 6,337 ​ ​ ​ ​ ​ ​ ​ Interest rate swaps not designated as hedging instruments ​ ​ ​ ​ ​ ​ Accrued liabilities ​ ​ 1,079 ​ ​ — ​ ​ ​ ​ ​ ​ ​ Total derivative liabilities ​ $ 2,581 ​ $ 6,337 ​ The following table presents the effect of our derivative instruments on our condensed consolidated statements of operations: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Total amount of interest expense in which the effects of cash flow hedges and undesignated interest rate swaps are recorded ​ $ 25,508 ​ $ 25,221 ​ $ 82,711 ​ $ 80,664 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps designated as cash flow hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pre-tax loss recognized in other comprehensive income (loss) ​ $ (581) ​ $ (87) ​ $ (670) ​ $ (8,399) Pre-tax loss reclassified from accumulated other comprehensive loss into interest expense ​ (1,867) ​ (1,271) ​ (4,440) ​ (2,594) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain recognized in interest expense ​ $ 532 ​ $ — ​ $ 532 ​ $ — ​ See Note 10 (“Accumulated Other Comprehensive Loss”) and Note 18 (“Fair Value Measurements”) for further details on our derivative instruments.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	18. Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis On a quarterly basis, our interest rate swap derivative instruments are valued based on the income approach (discounted cash flow) using market observable inputs, including LIBOR forward curves. These fair value measurements are classified as Level 2. The following table presents our derivative position measured at fair value on a recurring basis, with pricing levels as of the date of valuation: ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Derivative liabilities ​ $ 2,581 ​ $ 6,337 ​ Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Goodwill In the first quarter of 2020, we determined that the significant deterioration in global macroeconomic conditions caused by the COVID-19 pandemic was an indicator of potential impairment of our goodwill, and we performed a quantitative impairment test as of March 31, 2020 that resulted in a $99.8 million impairment of our goodwill. Significant estimates used in our impairment analysis included cash flow forecasts, our estimate of the market’s weighted average cost of capital and market multiples, which are Level 3 inputs. See Note 7 (“Goodwill”) for further details of the valuation methodology used in connection with the goodwill impairment. Compressors During the nine months ended September 30, 2021, we recorded nonrecurring fair value measurements related to our idle and previously-culled compressors. Our estimate of the compressors’ fair value was primarily based on the expected net sale proceeds compared to other fleet units we recently sold and/or a review of other units recently offered for sale by third parties, or the estimated component value of the equipment we plan to use. We discounted the expected proceeds, net of selling and other carrying costs, using a weighted average disposal period of four years. These fair value measurements are classified as Level 3. The following table presents the fair value of our compressors impaired during 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Impaired compressors ​ $ 3,896 ​ $ 19,046 ​ The significant unobservable inputs used to develop the above fair value measurements were weighted by the relative fair value of the compressors being measured. Additional quantitative information related to our significant unobservable inputs follows: ​ ​ ​ ​ ​ ​ ​ Range Weighted Average (1) Estimated net sale proceeds: ​ ​ ​ ​ As of September 30, 2021 ​ $0 - $621 per horsepower ​ $31 per horsepower As of December 31, 2020 ​ $0 - $289 per horsepower ​ $20 per horsepower (1) Calculated based on an estimated discount for market liquidity of 68% and 81% as of September 30, 2021 and December 31, 2020, respectively. ​ See Note 13 (“Long-Lived and Other Asset Impairment”) for further details. Other Financial Instruments The carrying amounts of our cash, receivables and payables approximate fair value due to the short-term nature of those instruments. The carrying amount of borrowings outstanding under our Credit Facility approximates fair value due to its variable interest rate. The fair value of these outstanding borrowings is a Level 3 measurement. The fair value of our fixed rate debt is estimated using yields observable in active markets, which are Level 2 inputs, and was as follows: ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Carrying amount of fixed rate debt (1) ​ $ 1,296,135 ​ $ 1,295,867 Fair value of fixed rate debt ​ 1,352,000 ​ 1,371,000 (1) Carrying amounts are shown net of unamortized debt premium and unamortized deferred financing costs. See Note 9 (“Long-Term Debt”).

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	19. Stock-Based Compensation ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Equity award expense ​ $ 2,900 ​ $ 2,645 ​ $ 8,741 ​ $ 8,423 Liability award expense ​ 127 ​ 243 ​ 1,121 ​ 537 Total stock-based compensation expense ​ $ 3,027 ​ $ 2,888 ​ $ 9,862 ​ $ 8,960 ​ The following table presents the activity of our stock-settled restricted stock awards, restricted stock units and performance-based restricted stock units and our cash-settled performance-based restricted stock units during the nine months ended September 30, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Average ​ ​ ​ ​ Grant Date ​ ​ ​ ​ Fair Value (shares in thousands) Shares Per Share Non-vested, December 31, 2020 2,446 ​ $ 9.69 Granted 1,287 ​ 11.20 Vested (1,023) ​ 9.95 Canceled (72) ​ 9.81 Non-vested, September 30, 2021 (1) 2,638 ​ 10.32 (1) Comprised of 523 cash-settled units and 2,115 stock-settled awards and units. As of September 30, 2021, we expect $16.2 million of unrecognized compensation cost related to our non-vested awards and units to be recognized over the weighted average period of 1.9 years.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	20. Commitments and Contingencies Performance Bonds In the normal course of business we have issued performance bonds to various state authorities that ensure payment of certain obligations. We have also issued a bond to protect our 401(k) retirement plan against losses caused by acts of fraud or dishonesty. The bonds have expiration dates in 2021 through the fourth quarter of 2022, and maximum potential future payments of $1.5 million. As of September 30, 2021, we were in compliance with all obligations to which the performance bonds pertain. Tax Matters We are subject to a number of state and local taxes that are not income-based. As many of these taxes are subject to audit by the taxing authorities, it is possible that an audit could result in additional taxes due. We accrue for such additional taxes when we determine that it is probable that we have incurred a liability and we can reasonably estimate the amount of the liability. As of September 30, 2021 and December 31, 2020, we accrued $5.7 million and $5.6 million, respectively, for the outcomes of non-income-based tax audits. We do not expect that the ultimate resolutions of these audits will result in a material variance from the amounts accrued. We do not accrue for unasserted claims for tax audits unless we believe the assertion of a claim is probable, it is probable that it will be determined that the claim is owed and we can reasonably estimate the claim or range of the claim. We believe the likelihood is remote that the impact of potential unasserted claims from non-income-based tax audits could be material to our consolidated financial position, but it is possible that the resolution of future audits could be material to our consolidated results of operations or cash flows. Subject to the provisions of the tax matters agreement between Exterran Corporation and us, both parties agreed to indemnify the primary obligor of any return for tax periods beginning before and ending before or after the Spin-off (including any ongoing or future amendments and audits for these returns) for the portion of the tax liability (including interest and penalties) that relates to their respective operations reported in the filing. The tax contingencies mentioned above relate to tax matters for which we are responsible in managing the audit. As of December 31, 2020, we had an indemnification liability (including penalties and interest), in addition to the tax contingency above, of $1.6 million for our share of non-income-based tax contingencies related to audits being managed by Exterran Corporation. During the nine months ended September 30, 2021, these audits were settled and our indemnification liability was reduced to zero. Insurance Matters Our business can be hazardous, involving unforeseen circumstances such as uncontrollable flows of natural gas or well fluids and fires or explosions. As is customary in our industry, we review our safety equipment and procedures and carry insurance against some, but not all, risks of our business. Our insurance coverage includes property damage, general liability and commercial automobile liability and other coverage we believe is appropriate. We believe that our insurance coverage is customary for the industry and adequate for our business; however, losses and liabilities not covered by insurance would increase our costs. Additionally, we are substantially self-insured for workers’ compensation and employee group health claims in view of the relatively high per-incident deductibles we absorb under our insurance arrangements for these risks. Losses up to the deductible amounts are estimated and accrued based upon known facts, historical trends and industry averages. We are also self-insured for property damage to our offshore assets. Litigation and Claims In the ordinary course of business, we are involved in various pending or threatened legal actions. While we are unable to predict the ultimate outcome of these actions, we believe that any ultimate liability arising from any of these actions will not have a material adverse effect on our consolidated financial position, results of operations or cash flows, including our ability to pay dividends. However, because of the inherent uncertainty of litigation and arbitration proceedings, we cannot provide assurance that the resolution of any particular claim or proceeding to which we are a party will not have a material adverse effect on our consolidated financial position, results of operations or cash flows, including our ability to pay dividends.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	21. Related Party Transactions In connection with the closing of the Elite Acquisition, we issued 21.7 million shares of our common stock to JDH Capital, an affiliate of our customer Hilcorp. As long as JDH Capital, together with affiliates of Hilcorp, owns at least 7.5% of our outstanding common stock, it will have the right to designate one director to our Board of Directors. As of September 30, 2021, JDH Capital owned 11.1% of our outstanding common stock. Jeffery D. Hildebrand, founder and executive chairman of Hilcorp, was appointed Director in August 2019 and served until his resignation on July 29, 2020, at which time Jason C. Rebrook, President of Hilcorp, was appointed Director to fill the resulting vacancy. Mr. Hildebrand did not receive compensation in his role as Director and Mr. Rebrook received no compensation in his role as Director in 2020. In December 2020, the Board of Directors voted to approve the payment of Director cash and equity compensation to Mr. Rebrook beginning in 2021. Revenue from Hilcorp and affiliates was $9.5 million and $9.8 million during the three months ended September 30, 2021 and 2020, respectively, and $28.6 million and $30.7 million during the nine months ended September 30, 2021 and 2020, respectively. Accounts receivable, net due from Hilcorp and affiliates was $3.5 million and $3.9 million as of September 30, 2021 and December 31, 2020, respectively.

Segments

Segments	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segments	22. Segments We manage our business segments primarily based on the type of product or service provided. We have two segments which we operate within the U.S.: contract operations and aftermarket services. The contract operations segment primarily provides natural gas compression services to meet specific customer requirements. The aftermarket services segment provides a full range of services to support the compression needs of customers, from parts sales and normal maintenance services to full operation of a customer’s owned assets. We evaluate the performance of our segments based on gross margin for each segment. Revenue includes only sales to external customers. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Contract Aftermarket ​ ​ (in thousands) Operations Services Total Three months ended September 30, 2021 ​ ​ ​ Revenue ​ $ 158,911 ​ $ 36,255 ​ $ 195,166 Gross margin ​ 97,631 ​ 5,603 ​ 103,234 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2020 ​ ​ ​ Revenue ​ $ 175,223 ​ $ 30,408 ​ $ 205,631 Gross margin ​ 114,779 ​ 4,699 ​ 119,478 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2021 ​ ​ ​ Revenue ​ $ 488,810 ​ $ 97,402 ​ $ 586,212 Gross margin ​ 304,778 ​ 13,477 ​ 318,255 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2020 ​ ​ ​ Revenue ​ $ 570,146 ​ $ 105,498 ​ $ 675,644 Gross margin ​ 367,661 ​ 16,112 ​ 383,773 ​ The following table reconciles total gross margin to income (loss) before income taxes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Total gross margin ​ $ 103,234 ​ $ 119,478 ​ $ 318,255 ​ $ 383,773 Less: ​ ​ ​ ​ Selling, general and administrative ​ 28,839 ​ 18,681 ​ 80,000 ​ 78,052 Depreciation and amortization ​ 45,280 ​ 47,279 ​ 135,185 ​ 145,950 Long-lived and other asset impairment ​ 5,121 ​ 10,727 ​ 15,154 ​ 72,132 Goodwill impairment ​ ​ — ​ ​ — ​ ​ — ​ ​ 99,830 Restructuring charges ​ ​ 313 ​ ​ 2,900 ​ ​ 1,953 ​ ​ 7,036 Interest expense ​ 25,508 ​ 25,221 ​ 82,711 ​ 80,664 Debt extinguishment loss ​ — ​ — ​ — ​ 3,971 Gain on sale of assets, net ​ ​ (15,393) ​ ​ (9,146) ​ ​ (29,549) ​ ​ (11,073) Other (income) expense, net ​ 337 ​ (324) ​ (1,634) ​ (1,317) Income (loss) before income taxes ​ $ 13,229 ​ $ 24,140 ​ $ 34,435 ​ $ (91,472) ​

Impact of Hurricane

Impact of Hurricane	9 Months Ended
	Sep. 30, 2021
Impact of Hurricane
Impact of Hurricane	23. Impact of Hurricane Hurricane Ida made landfall in Louisiana on August 29, 2021, causing operational disruptions, damage to compressors and a temporary shutdown of facilities in Louisiana that negatively impacted our financial performance in the quarter. During the three months ended September 30, 2021, we recorded $2.0 million in depreciation expense associated with the damaged assets. We have notified our insurance underwriters and filed a claim for damages caused by Hurricane Ida and are working with an adjuster. We are evaluating and documenting the damage caused including finalizing inspections of damaged compressors and other property. As of September 30, 2021, we are unable to estimate the expected amount to be recovered from insurance, which will be subject to a deductible currently estimated at $0.9 million. ​ ​ ​

Recent Accounting Developments

Recent Accounting Developments (Policies)	9 Months Ended
	Sep. 30, 2021
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Standards Updates Not Yet Implemented	Accounting Standards Updates Implemented Reference Rate Reform On June 10, 2021, we prospectively adopted ASU 2020-04, which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference LIBOR or another reference rate expected to be discontinued as a result of reference rate reform. ASU 2020-04 is effective for all entities as of March 12, 2020 through December 31, 2022. Entities may elect to apply the amendments for contract modifications as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020. On June 10, 2021, we amended one of our interest rate swap agreements and determined that the modifications meet the criteria for the optional expedients and exceptions, which allow us to forego dedesignation of the hedging relationship and to subsequently assess effectiveness on a qualitative basis. The adoption of ASU 2020-04 did not have a material impact on our consolidated financial statements. In the first quarter, we evaluated Amendment No. 3 to our Credit Facility and determined that ASU 2020-04 was not applicable. We will continue to assess any modifications to our interest rate swap and Credit Facility agreements during the effective period of this update and will apply the amendments as applicable.

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]
Summary of balance sheets and statements of operations for discontinued operations	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Other assets ​ $ 7,868 ​ $ 7,868 Deferred tax assets ​ ​ 2,249 ​ ​ 3,168 Total assets associated with discontinued operations ​ $ 10,117 ​ $ 11,036 ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities ​ $ 7,868 ​ $ 7,868 Total liabilities associated with discontinued operations ​ $ 7,868 ​ $ 7,868

Inventory (Tables)

Inventory (Tables)	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Schedule of inventory, net of reserves	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Parts and supplies ​ $ 59,478 ​ $ 57,433 Work in progress ​ 7,152 ​ 6,237 Inventory ​ $ 66,630 ​ $ 63,670

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Schedule of property, plant and equipment, net	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Compression equipment, facilities and other fleet assets ​ $ 3,269,801 ​ $ 3,439,432 Land and buildings ​ 43,373 ​ 45,167 Transportation and shop equipment ​ 95,210 ​ 106,868 Computer hardware and software ​ 84,733 ​ 84,680 Other ​ 24,496 ​ 14,457 Property, plant and equipment ​ 3,517,613 ​ 3,690,604 Accumulated depreciation ​ (1,265,387) ​ (1,300,930) Property, plant and equipment, net ​ $ 2,252,226 ​ $ 2,389,674

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Schedule of long-term debt	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Credit Facility ​ $ 220,000 ​ $ 393,000 ​ ​ ​ ​ ​ ​ ​ 2028 Notes ​ ​ ​ ​ ​ ​ Principal ​ 800,000 ​ 800,000 Debt premium, net of amortization ​ ​ 13,037 ​ 14,541 Deferred financing costs, net of amortization ​ (10,821) ​ (11,766) ​ ​ 802,216 ​ 802,775 ​ ​ ​ ​ ​ ​ ​ 2027 Notes ​ ​ ​ ​ ​ ​ Principal ​ ​ 500,000 ​ 500,000 Deferred financing costs, net of amortization ​ ​ (6,081) ​ (6,908) ​ ​ ​ 493,919 ​ 493,092 ​ ​ ​ ​ ​ ​ ​ Long-term debt ​ $ 1,516,135 ​ $ 1,688,867
Schedule of financial ratios to be maintained defined in Credit Facility agreement	​ ​ ​ ​ Senior Secured Debt to EBITDA 3.00 to 1.0 Total Debt to EBITDA Through fiscal year 2022 ​ 5.75 to 1.0 January 1, 2023 through September 30, 2023 5.50 to 1.0 Thereafter (1) 5.25 to 1.0 (1) Subject to a temporary increase to 5.50 to 1.0 for any quarter during which an acquisition satisfying certain thresholds is completed and for the two quarters immediately following such quarter.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss).
Schedule of Accumulated Other Comprehensive Income (Loss)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Beginning accumulated other comprehensive loss ​ $ (3,044) ​ $ (6,908) ​ $ (5,006) ​ $ (1,387) Other comprehensive income (loss), net of tax: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss recognized in other comprehensive income (loss), net of tax benefit of $123, $18, $141 and $1,764, respectively ​ (458) ​ (69) ​ (529) ​ (6,635) Loss reclassified from accumulated other comprehensive loss to interest expense, net of tax benefit of $393, $267, $933 and $545, respectively ​ 1,474 ​ 1,004 ​ 3,507 ​ 2,049 Total other comprehensive income (loss) ​ 1,016 ​ 935 ​ 2,978 ​ (4,586) Ending accumulated other comprehensive loss ​ $ (2,028) ​ $ (5,973) ​ $ (2,028) ​ $ (5,973)

Equity (Tables)

Equity (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Summary of entity's dividends per common share	​ ​ ​ ​ ​ ​ ​ ​ ​ Declared Dividends Dividends Paid ​ per Common Share (in thousands) 2021 ​ ​ Q3 ​ $ 0.145 ​ $ 22,506 Q2 ​ ​ 0.145 ​ ​ 22,331 Q1 ​ ​ 0.145 ​ ​ 22,155 ​ ​ ​ ​ ​ ​ ​ 2020 ​ ​ Q4 ​ $ 0.145 ​ $ 22,177 Q3 ​ 0.145 ​ 22,308 Q2 ​ 0.145 ​ 22,176 Q1 ​ 0.145 ​ 22,171

Revenue from Contract with Cu_2

Revenue from Contract with Customers (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Contract operations: ​ ​ ​ ​ ​ ​ ​ ​ 0 ― 1,000 horsepower per unit ​ $ 41,576 ​ $ 51,409 ​ $ 134,413 ​ $ 175,877 1,001 ― 1,500 horsepower per unit ​ 66,138 ​ 73,205 ​ 201,454 ​ 236,083 Over 1,500 horsepower per unit ​ 51,018 ​ 50,142 ​ 152,360 ​ 156,351 Other (1) ​ 179 ​ 467 ​ 583 ​ 1,835 Total contract operations revenue (2) ​ 158,911 ​ 175,223 ​ 488,810 ​ 570,146 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Aftermarket services: ​ ​ ​ ​ Services ​ 19,249 ​ 17,961 ​ 53,149 ​ 62,492 OTC parts and components sales ​ 17,006 ​ 12,447 ​ 44,253 ​ 43,006 Total aftermarket services revenue (3) ​ 36,255 ​ 30,408 ​ 97,402 ​ 105,498 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total revenue ​ $ 195,166 ​ $ 205,631 ​ $ 586,212 ​ $ 675,644 (1) Primarily relates to fees associated with owned non-compression equipment. (2) Includes $0.7 million and $1.4 million for the three months ended September 30, 2021 and 2020, respectively, and $3.1 million and $4.5 million for the nine months ended September 30, 2021 and 2020, respectively, related to billable maintenance on owned compressors that was recognized at a point in time. All other contract operations revenue is recognized over time. (3) All services revenue within aftermarket services is recognized over time. All OTC parts and components sales revenue is recognized at a point in time.
Schedule of remaining Performance Obligation	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) 2021 2022 2023 2024 2025 ​ 2026 Total Remaining performance obligations ​ $ 1,093 ​ $ 95,890 ​ $ 128,521 ​ $ 32,787 ​ $ 9,148 ​ $ 759 ​ $ 268,198
Summary of changes in the allowance for credit losses balance	​ ​ ​ ​ ​ (in thousands) ​ ​ ​ Balance at December 31, 2020 $ 3,370 Provision for credit losses ​ ​ 151 Write-offs charged against allowance ​ ​ (464) Balance at September 30, 2021 ​ $ 3,057

Long-Lived and Other Asset Im_2

Long-Lived and Other Asset Impairment (Tables)	9 Months Ended
	Sep. 30, 2021
Long-Lived and Other Asset Impairment
Schedule of impairment of long-lived assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (dollars in thousands) 2021 2020 2021 2020 Idle compressors retired from the active fleet ​ 60 ​ 105 ​ 175 ​ 640 Horsepower of idle compressors retired from the active fleet ​ 24,000 ​ 28,000 ​ 61,000 ​ 235,000 Impairment recorded on idle compressors retired from the active fleet ​ $ 5,120 ​ $ 8,137 ​ $ 14,964 ​ $ 69,542

Restructuring Charges (Tables)

Restructuring Charges (Tables)	9 Months Ended
	Sep. 30, 2021
Restructuring Charges
Schedule of restructuring charges by segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Contract ​ Aftermarket ​ ​ ​ ​ ​ ​ (in thousands) ​ Operations ​ Services ​ Other (1) ​ Total Three months ended September 30, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pandemic restructuring ​ $ — ​ $ — ​ $ 224 ​ $ 224 Property restructuring - other exit costs ​ ​ — ​ ​ — ​ ​ 19 ​ ​ 19 Other restructuring ​ ​ — ​ ​ — ​ ​ 70 ​ ​ 70 Total restructuring charges ​ $ — ​ $ — ​ $ 313 ​ $ 313 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Organizational restructuring ​ $ (20) ​ $ — ​ $ (13) ​ $ (33) Pandemic restructuring ​ ​ 546 ​ ​ 644 ​ ​ 245 ​ ​ 1,435 Property restructuring ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss on sale ​ ​ — ​ ​ — ​ ​ 915 ​ ​ 915 Impairment loss ​ ​ — ​ ​ — ​ ​ 583 ​ ​ 583 Total property restructuring ​ ​ — ​ ​ — ​ ​ 1,498 ​ ​ 1,498 Total restructuring charges ​ $ 526 ​ $ 644 ​ $ 1,730 ​ $ 2,900 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pandemic restructuring ​ $ 616 ​ $ 145 ​ $ 956 ​ $ 1,717 Property restructuring ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impairment loss ​ ​ — ​ ​ — ​ ​ 9 ​ ​ 9 Other exit costs ​ ​ — ​ ​ — ​ ​ 26 ​ ​ 26 Total property restructuring ​ ​ — ​ ​ — ​ ​ 35 ​ ​ 35 Other restructuring ​ ​ — ​ ​ — ​ ​ 201 ​ ​ 201 Total restructuring charges ​ $ 616 ​ $ 145 ​ $ 1,192 ​ $ 1,953 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Organizational restructuring ​ $ 458 ​ $ 625 ​ $ 612 ​ $ 1,695 Pandemic restructuring ​ ​ 1,932 ​ ​ 931 ​ ​ 980 ​ ​ 3,843 Property restructuring ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss on sale ​ ​ — ​ ​ — ​ ​ 915 ​ ​ 915 Impairment loss ​ ​ — ​ ​ — ​ ​ 583 ​ ​ 583 Total property restructuring ​ ​ — ​ ​ — ​ ​ 1,498 ​ ​ 1,498 Total restructuring charges ​ $ 2,390 ​ $ 1,556 ​ $ 3,090 ​ $ 7,036 (1) Represents expense incurred within our corporate function and not directly attributable to our segments.
Schedule of restructuring charges by type	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) ​ 2021 ​ 2020 ​ 2021 ​ 2020 Severance costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Organizational restructuring ​ $ — ​ $ (33) ​ $ — ​ $ 1,695 Pandemic restructuring ​ ​ 224 ​ 1,435 ​ 1,717 ​ 3,843 Total severance costs ​ ​ 224 ​ ​ 1,402 ​ ​ 1,717 ​ ​ 5,538 Property disposal costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss on sale ​ ​ — ​ ​ 915 ​ ​ — ​ ​ 915 Impairment loss ​ ​ — ​ ​ 583 ​ ​ 9 ​ ​ 583 Other exit costs ​ ​ 19 ​ ​ — ​ ​ 26 ​ ​ — Total property disposal costs ​ 19 ​ 1,498 ​ 35 ​ 1,498 Other restructuring costs ​ ​ 70 ​ ​ — ​ ​ 201 ​ ​ — Total restructuring charges ​ $ 313 ​ $ 2,900 ​ $ 1,953 ​ $ 7,036

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Summary of net income (loss) attributable to Archrock common stockholders used in the calculation of basic and diluted income (loss) per common share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Net income (loss) ​ $ 9,304 ​ $ 18,332 ​ $ 22,225 ​ $ (73,236) Less: Earnings attributable to participating securities ​ (456) ​ (439) ​ (909) ​ (1,083) Net income (loss) attributable to common stockholders ​ $ 8,848 ​ $ 17,893 ​ $ 21,316 ​ $ (74,319)
Schedule of potential shares of common stock that were included in computing diluted income (loss) attributable to Archrock common stockholders per common share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Weighted average common shares outstanding including participating securities ​ 154,041 ​ 152,973 ​ 153,422 ​ 152,790 Less: Weighted average participating securities outstanding (1,883) (1,999) (1,807) (2,060) Weighted average common shares outstanding used in basic net income (loss) per common share 152,158 150,974 151,615 150,730 Net dilutive potential common shares issuable: ​ On exercise of options and vesting of performance-based restricted stock units 138 ​ 57 152 — On settlement of ESPP shares 1 ​ 7 2 — Weighted average common shares outstanding used in diluted net income (loss) per common share 152,297 151,038 151,769 150,730
Schedule of potential shares of common stock issuable, excluded from computation of diluted income (loss), attributable to Archrock common stockholders per common share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 On exercise of options where exercise price is greater than average market value for the period ​ 15 85 27 102 On exercise of options and vesting of performance-based restricted stock units ​ — ​ — ​ — ​ 57 On settlement of ESPP shares ​ — ​ — ​ — ​ 19 Net dilutive potential common shares issuable ​ 15 ​ 85 ​ 27 ​ 178

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of effect of derivative instruments on consolidated financial position	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Interest rate swaps designated as cash flow hedging instruments ​ ​ ​ ​ ​ ​ Accrued liabilities ​ $ 1,502 ​ $ 4,810 Other liabilities ​ — ​ 1,527 Total derivatives designated as cash flow hedging instruments ​ ​ 1,502 ​ ​ 6,337 ​ ​ ​ ​ ​ ​ ​ Interest rate swaps not designated as hedging instruments ​ ​ ​ ​ ​ ​ Accrued liabilities ​ ​ 1,079 ​ ​ — ​ ​ ​ ​ ​ ​ ​ Total derivative liabilities ​ $ 2,581 ​ $ 6,337
Schedule of effect of derivative instruments on results of operations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Total amount of interest expense in which the effects of cash flow hedges and undesignated interest rate swaps are recorded ​ $ 25,508 ​ $ 25,221 ​ $ 82,711 ​ $ 80,664 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps designated as cash flow hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pre-tax loss recognized in other comprehensive income (loss) ​ $ (581) ​ $ (87) ​ $ (670) ​ $ (8,399) Pre-tax loss reclassified from accumulated other comprehensive loss into interest expense ​ (1,867) ​ (1,271) ​ (4,440) ​ (2,594) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain recognized in interest expense ​ $ 532 ​ $ — ​ $ 532 ​ $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair value
Summary of assets and liabilities measured at fair value on recurring basis	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Derivative liabilities ​ $ 2,581 ​ $ 6,337
Compressors
Fair value
Schedule of non-recurring fair value assets	​ ​ ​ ​ ​ ​ ​ ​ (in thousands) September 30, 2021 December 31, 2020 Impaired compressors ​ $ 3,896 ​ $ 19,046
Schedule of significant unobservable inputs	​ ​ ​ ​ ​ ​ ​ Range Weighted Average (1) Estimated net sale proceeds: ​ ​ ​ ​ As of September 30, 2021 ​ $0 - $621 per horsepower ​ $31 per horsepower As of December 31, 2020 ​ $0 - $289 per horsepower ​ $20 per horsepower (1) Calculated based on an estimated discount for market liquidity of 68% and 81% as of September 30, 2021 and December 31, 2020, respectively.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Schedule of allocated stock-based compensation	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Equity award expense ​ $ 2,900 ​ $ 2,645 ​ $ 8,741 ​ $ 8,423 Liability award expense ​ 127 ​ 243 ​ 1,121 ​ 537 Total stock-based compensation expense ​ $ 3,027 ​ $ 2,888 ​ $ 9,862 ​ $ 8,960
Schedule of restricted stock, restricted stock unit, performance unit, cash settled restricted stock unit and cash settled performance unit activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Average ​ ​ ​ ​ Grant Date ​ ​ ​ ​ Fair Value (shares in thousands) Shares Per Share Non-vested, December 31, 2020 2,446 ​ $ 9.69 Granted 1,287 ​ 11.20 Vested (1,023) ​ 9.95 Canceled (72) ​ 9.81 Non-vested, September 30, 2021 (1) 2,638 ​ 10.32 (1) Comprised of 523 cash-settled units and 2,115 stock-settled awards and units.

Segments (Tables)

Segments (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Summary of revenue and other financial information by reportable segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Contract Aftermarket ​ ​ (in thousands) Operations Services Total Three months ended September 30, 2021 ​ ​ ​ Revenue ​ $ 158,911 ​ $ 36,255 ​ $ 195,166 Gross margin ​ 97,631 ​ 5,603 ​ 103,234 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2020 ​ ​ ​ Revenue ​ $ 175,223 ​ $ 30,408 ​ $ 205,631 Gross margin ​ 114,779 ​ 4,699 ​ 119,478 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2021 ​ ​ ​ Revenue ​ $ 488,810 ​ $ 97,402 ​ $ 586,212 Gross margin ​ 304,778 ​ 13,477 ​ 318,255 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2020 ​ ​ ​ Revenue ​ $ 570,146 ​ $ 105,498 ​ $ 675,644 Gross margin ​ 367,661 ​ 16,112 ​ 383,773
Reconciliation of net income (loss) to gross margin	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended Nine Months Ended ​ ​ September 30, ​ September 30, (in thousands) 2021 2020 2021 2020 Total gross margin ​ $ 103,234 ​ $ 119,478 ​ $ 318,255 ​ $ 383,773 Less: ​ ​ ​ ​ Selling, general and administrative ​ 28,839 ​ 18,681 ​ 80,000 ​ 78,052 Depreciation and amortization ​ 45,280 ​ 47,279 ​ 135,185 ​ 145,950 Long-lived and other asset impairment ​ 5,121 ​ 10,727 ​ 15,154 ​ 72,132 Goodwill impairment ​ ​ — ​ ​ — ​ ​ — ​ ​ 99,830 Restructuring charges ​ ​ 313 ​ ​ 2,900 ​ ​ 1,953 ​ ​ 7,036 Interest expense ​ 25,508 ​ 25,221 ​ 82,711 ​ 80,664 Debt extinguishment loss ​ — ​ — ​ — ​ 3,971 Gain on sale of assets, net ​ ​ (15,393) ​ ​ (9,146) ​ ​ (29,549) ​ ​ (11,073) Other (income) expense, net ​ 337 ​ (324) ​ (1,634) ​ (1,317) Income (loss) before income taxes ​ $ 13,229 ​ $ 24,140 ​ $ 34,435 ​ $ (91,472)

Description of Business and Bas

Description of Business and Basis of Presentation (Details)	9 Months Ended
	Sep. 30, 2021segment
Description of Business and Basis of Presentation
Number of reportable segments	2

Business Transactions (Details)

Business Transactions (Details) hp in Thousands, $ in Thousands	1 Months Ended					3 Months Ended		9 Months Ended		15 Months Ended
	Jul. 31, 2021USD ($)CompressorUnit	Jul. 30, 2021USD ($)	Feb. 28, 2021hpCompressorUnit	Jul. 31, 2020USD ($)	Mar. 31, 2020CompressorUnithp	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)
Transactions
Gain on disposition								$ 18,945	$ 12,475
Proceeds from sale								24,683	14,043
Disposed of by Sale | July 2021 Dispositions
Transactions
Number of compressors | CompressorUnit	575
Compressor units horsepower (horsepower)	100
Cash consideration received						$ 60,300		60,300
Gain on disposition						$ 13,000		13,000
Consideration receivable	$ 1,300
Disposed of by Sale | February 2021 Disposition
Transactions
Number of compressors | CompressorUnit			300
Compressor units horsepower (horsepower) | hp			40
Gain on disposition								6,000
Disposed of by Sale | July 2020 Disposition
Transactions
Disposal Group, Not Discontinued Operation, Name of Segment				Aftermarket Services
Cash consideration received				$ 9,500
Cash consideration received on first anniversary of closing		$ 3,000
Amount of consideration receivable as credit for purchases				$ 3,500
Cash received under supply agreement								$ 2,500		$ 3,200
Gain on disposition							$ 9,300		9,300
Disposed of by Sale | March 2020 Disposition
Transactions
Number of compressors | CompressorUnit					200
Compressor units horsepower (horsepower) | hp					35
Gain on disposition									$ 3,200
Turbocharger goods and services | July 2020 Disposition
Transactions
Term of supply agreement				2 years

Discontinued Operations - Descr

Discontinued Operations - Description (Details) - Exterran Corporation - Spinoff - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Discontinued Operations
Deferred tax liabilities	$ 7,868	$ 7,868
Indemnification asset	$ 7,868	$ 7,868

Discontinued Operations - Balan

Discontinued Operations - Balance Sheet Data for Discontinued Operations (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Summary of balance sheet data for discontinued operations
Total assets associated with discontinued operations	$ 10,117	$ 11,036
Total liabilities associated with discontinued operations	7,868	7,868
Spinoff | Exterran Corporation
Summary of balance sheet data for discontinued operations
Other assets	7,868	7,868
Deferred tax assets	2,249	3,168
Total assets associated with discontinued operations	10,117	11,036
Deferred tax liabilities	7,868	7,868
Total liabilities associated with discontinued operations	$ 7,868	$ 7,868

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Composition of Inventory net of reserves
Parts and supplies	$ 59,478	$ 57,433
Work in progress	7,152	6,237
Inventory	$ 66,630	$ 63,670

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment
Property, plant and equipment, gross	$ 3,517,613	$ 3,690,604
Accumulated depreciation	(1,265,387)	(1,300,930)
Property, plant and equipment, net	2,252,226	2,389,674
Compression equipment, facilities and other fleet assets
Property, Plant and Equipment
Property, plant and equipment, gross	3,269,801	3,439,432
Land and buildings
Property, Plant and Equipment
Property, plant and equipment, gross	43,373	45,167
Transportation and shop equipment
Property, Plant and Equipment
Property, plant and equipment, gross	95,210	106,868
Computer hardware and software
Property, Plant and Equipment
Property, plant and equipment, gross	84,733	84,680
Other property, plant and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	$ 24,496	$ 14,457

Goodwill (Details)

Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020
Change in the carrying value of goodwill
Goodwill impairment	$ 99,800	$ 99,830

Hosting Arrangements (Details)

Hosting Arrangements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Hosting arrangements, Capitalized costs	$ 10.8		$ 10.8		$ 7.7
Hosting arrangements, Accumulated amortization	0.6		0.6		$ 0.3
Hosting arrangements, Amortization	$ 0.1	$ 0.1	$ 0.3	$ 0.2
Impairment of capitalized implementation costs		$ 1.6		$ 1.6

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instruments
Long-term debt	$ 1,516,135	$ 1,688,867
Credit Facility
Debt Instruments
Long-term debt	220,000	393,000
2028 Notes
Debt Instruments
Long term debt gross	800,000	800,000
Debt premium, net of amortization	13,037	14,541
Deferred financing costs, net of amortization	(10,821)	(11,766)
Long-term debt	802,216	802,775
2027 Notes
Debt Instruments
Long term debt gross	500,000	500,000
Deferred financing costs, net of amortization	(6,081)	(6,908)
Long-term debt	$ 493,919	$ 493,092

Long-Term Debt - Credit Facilit

Long-Term Debt - Credit Facility (Details) $ in Millions	3 Months Ended		9 Months Ended			13 Months Ended	22 Months Ended	45 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2023	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Nov. 08, 2024	Dec. 31, 2022	Nov. 08, 2024	Feb. 22, 2021USD ($)	Dec. 31, 2020USD ($)
Credit Facility
Line of Credit Facility
Letter of credit outstanding	$ 12.5			$ 12.5
Debt instrument, variable rate (percentage)				2.40%
Debt instrument weighted average interest rate (percent)	2.60%			2.60%						2.70%
Commitment fee amount	$ 0.5	$ 0.4		$ 1.5	$ 1.5
Undrawn capacity under revolving credit facility	$ 517.5			517.5
Maximum borrowing capacity									$ 750	$ 1,250
Credit Facility, Amendment 3
Line of Credit Facility
Transaction costs									$ 1.8
Debt issuance cost written off				$ 4.9
Forecasted | Credit Facility
Line of Credit Facility
Senior Secured Debt to EBITDA								3
Total Debt to EBITDA ratio			5.50			5.25	5.75
Total debt to EBITDA ratio in period which an acquisition is completed and for two quarters following such quarter						5.50

Long-Term Debt - 2022 Notes Red

Long-Term Debt - 2022 Notes Redemption (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Apr. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instruments
Repayments of long-term debt		$ 695,751	$ 988,500
Debt extinguishment loss			3,971
2022 Notes
Debt Instruments
Redemption rate (as a percent)	100.00%
Repayments of long-term debt	$ 350,000
Interest paid	$ 10,500
Debt extinguishment loss			$ 4,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity
Beginning balance	$ 913,821	$ 950,873	$ 935,557	$ 1,085,963
Other comprehensive income (loss), net of tax:
Total other comprehensive income (loss), net of tax	1,016	935	2,978	(4,586)
Ending balance	904,047	949,685	904,047	949,685
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity
Beginning balance	(3,044)	(6,908)	(5,006)	(1,387)
Other comprehensive income (loss), net of tax:
Gain (loss) recognized in other comprehensive income (loss), net of tax expense (benefit)	(458)	(69)	(529)	(6,635)
(Gain) loss reclassified from accumulated other comprehensive loss to interest expense, net of tax (expense) benefit	1,474	1,004	3,507	2,049
Total other comprehensive income (loss), net of tax	1,016	935	2,978	(4,586)
Ending balance	(2,028)	(5,973)	(2,028)	(5,973)
Gain (loss) recognized in other comprehensive income, tax expense (benefit)	(123)	(18)	(141)	(1,764)
(Gain) loss reclassified from accumulated other comprehensive loss, tax (expense) benefit	$ 393	$ 267	$ 933	$ 545

Equity - Equity Offering (Detai

Equity - Equity Offering (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Feb. 23, 2021
Subsidiary, Sale of Stock [Line Items]
Net proceeds from issuance of common stock	$ 3,401
ATM Agreement
Subsidiary, Sale of Stock [Line Items]
Maximum amount of shares to be issued		$ 50,000
Stock issued (in shares)	357,148
Net proceeds from issuance of common stock	$ 3,400

Equity - Cash Dividends (Detail

Equity - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	Oct. 28, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Distributions
Declared Dividends per Common Share (in dollars per share)		$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.435	$ 0.435
Dividends Paid		$ 22,506	$ 22,331	$ 22,155	$ 22,177	$ 22,308	$ 22,176	$ 22,171	$ 66,992	$ 66,655
Subsequent Event
Distributions
Declared Dividends per Common Share (in dollars per share)	$ 0.145

Revenue from Contract with Cu_3

Revenue from Contract with Customers - Disaggregate Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)hp	Sep. 30, 2020USD ($)hp	Sep. 30, 2021USD ($)hp	Sep. 30, 2020USD ($)hp
Disaggregation of Revenue
Revenue	$ 195,166	$ 205,631	$ 586,212	$ 675,644
Contract Operations
Disaggregation of Revenue
Revenue	158,911	175,223	488,810	570,146
Contract Operations | Transferred at Point in Time
Disaggregation of Revenue
Revenue	700	1,400	3,100	4,500
Contract Operations | 0 - 1,000 horsepower per unit
Disaggregation of Revenue
Revenue	$ 41,576	$ 51,409	$ 134,413	$ 175,877
Contract Operations | 0 - 1,000 horsepower per unit | Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) | hp	0	0	0	0
Contract Operations | 0 - 1,000 horsepower per unit | Maximum
Disaggregation of Revenue
Compressor units horsepower (horsepower) | hp	1,000	1,000	1,000	1,000
Contract Operations | 1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Revenue	$ 66,138	$ 73,205	$ 201,454	$ 236,083
Contract Operations | 1,001 - 1,500 horsepower per unit | Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) | hp	1,001	1,001	1,001	1,001
Contract Operations | 1,001 - 1,500 horsepower per unit | Maximum
Disaggregation of Revenue
Compressor units horsepower (horsepower) | hp	1,500	1,500	1,500	1,500
Contract Operations | Over 1,500 horsepower per unit
Disaggregation of Revenue
Revenue	$ 51,018	$ 50,142	$ 152,360	$ 156,351
Contract Operations | Over 1,500 horsepower per unit | Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) | hp	1,500	1,500	1,500	1,500
Contract Operations | Other, including fees
Disaggregation of Revenue
Revenue	$ 179	$ 467	$ 583	$ 1,835
Aftermarket Services
Disaggregation of Revenue
Revenue	36,255	30,408	97,402	105,498
Aftermarket Services | Services
Disaggregation of Revenue
Revenue	19,249	17,961	53,149	62,492
Aftermarket Services | OTC parts and components sales
Disaggregation of Revenue
Revenue	$ 17,006	$ 12,447	$ 44,253	$ 43,006

Revenue from Contract with Cu_4

Revenue from Contract with Customers - Performance Obligations (Details) $ in Thousands	Sep. 30, 2021USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 268,198
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 1,093
Performance obligations expected to be satisfied, expected timing	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 95,890
Performance obligations expected to be satisfied, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 128,521
Performance obligations expected to be satisfied, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 32,787
Performance obligations expected to be satisfied, expected timing	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]
Remaining performance obligations	$ 9,148
Performance obligations expected to be satisfied, expected timing	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]
Remaining performance obligations	$ 759
Performance obligations expected to be satisfied, expected timing	1 year

Revenue from Contract with Cu_5

Revenue from Contract with Customers - Contract Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Disaggregation of Revenue
Accounts receivable, trade, net of allowance	$ 108,936	$ 104,425
Contract with Customers
Disaggregation of Revenue
Accounts receivable, trade, net of allowance	$ 95,300	$ 95,600

Revenue from Contract with Cu_6

Revenue from Contract with Customers - Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Contractual life of accounts receivable	30 days
Period for analyzing historical loss data to determine loss experience	2 years
Changes in the allowance for credit losses balance
Balance at beginning of period	$ 3,370
Provision for credit losses	151	$ 2,235
Write-offs charged against the allowance	(464)
Balance at end of period	$ 3,057

Revenue from Contract with Cu_7

Revenue from Contract with Customers - Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Contract liability with customer	$ 4,600
Deferred revenue	8,167	$ 10,696
Deferred revenue recognized in earnings	$ 8,081	$ 17,183

Long-Lived Asset Impairment (De

Long-Lived Asset Impairment (Details) hp in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)CompressorUnithp	Sep. 30, 2020USD ($)CompressorUnithp	Sep. 30, 2021USD ($)CompressorUnithp	Sep. 30, 2020USD ($)CompressorUnithp
Impaired Long-Lived Assets Held and Used
Other asset impairment		$ 1,700		$ 1,700
Idle Compressor Units
Impaired Long-Lived Assets Held and Used
Idle compressors retired from the active fleet | CompressorUnit	60	105	175	640
Horsepower of idle compressors retired from the active fleet | hp	24	28	61	235
Impairment recorded on idle compressors retired from the active fleet	$ 5,120	$ 8,137	$ 14,964	$ 69,542

Restructuring Charges - General

Restructuring Charges - General (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring charges
Restructuring charges	$ 313	$ 2,900		$ 1,953	$ 7,036
Severance costs
Restructuring charges
Restructuring charges	224	1,402		1,717	5,538
Organizational Restructuring
Restructuring charges
Restructuring charges		(33)			1,695
Estimated additional charges	0			0
Organizational Restructuring | Severance costs
Restructuring charges
Restructuring charges		(33)	$ 1,700		1,695
Pandemic Restructuring
Restructuring charges
Restructuring charges	224	1,435		1,717	3,843
Estimated additional charges	0			0
Pandemic Restructuring | Severance costs
Restructuring charges
Restructuring charges	224	1,435		1,717	3,843
Restructuring charges incurred to date	7,000			7,000
Property Restructuring
Restructuring charges
Restructuring charges	19	$ 1,498		35	$ 1,498
Restructuring charges incurred to date	1,500			1,500
Facility Exit Plan
Restructuring charges
Estimated additional charges	$ 800			$ 800

Restructuring Charges - By segm

Restructuring Charges - By segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring charges
Restructuring charges	$ 313	$ 2,900	$ 1,953	$ 7,036
Organizational Restructuring
Restructuring charges
Restructuring charges		(33)		1,695
Pandemic Restructuring
Restructuring charges
Restructuring charges	224	1,435	1,717	3,843
Property Restructuring
Restructuring charges
Loss on sale		915		915
Impairment loss		583	9	583
Other exit costs			26
Restructuring charges	19	1,498	35	1,498
Other Restructuring
Restructuring charges
Restructuring charges	70		201
Corporate
Restructuring charges
Restructuring charges	313	1,730	1,192	3,090
Corporate | Organizational Restructuring
Restructuring charges
Restructuring charges		(13)		612
Corporate | Pandemic Restructuring
Restructuring charges
Restructuring charges	224	245	956	980
Corporate | Property Restructuring
Restructuring charges
Loss on sale		915		915
Impairment loss		583	9	583
Other exit costs			26
Restructuring charges	19	1,498	35	1,498
Corporate | Other Restructuring
Restructuring charges
Restructuring charges	$ 70		201
Contract Operations | Operating
Restructuring charges
Restructuring charges		526	616	2,390
Contract Operations | Operating | Organizational Restructuring
Restructuring charges
Restructuring charges		(20)		458
Contract Operations | Operating | Pandemic Restructuring
Restructuring charges
Restructuring charges		546	616	1,932
Aftermarket Services | Operating
Restructuring charges
Restructuring charges		644	145	1,556
Aftermarket Services | Operating | Organizational Restructuring
Restructuring charges
Restructuring charges				625
Aftermarket Services | Operating | Pandemic Restructuring
Restructuring charges
Restructuring charges		$ 644	$ 145	$ 931

Restructuring Charges - By type

Restructuring Charges - By type (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring charges
Restructuring charges	$ 313	$ 2,900		$ 1,953	$ 7,036
Organizational Restructuring
Restructuring charges
Restructuring charges		(33)			1,695
Pandemic Restructuring
Restructuring charges
Restructuring charges	224	1,435		1,717	3,843
Property Restructuring
Restructuring charges
Loss on sale		915			915
Impairment loss		583		9	583
Other exit costs				26
Restructuring charges	19	1,498		35	1,498
Other Restructuring
Restructuring charges
Restructuring charges	70			201
Severance costs
Restructuring charges
Restructuring charges	224	1,402		1,717	5,538
Severance costs | Organizational Restructuring
Restructuring charges
Restructuring charges		(33)	$ 1,700		1,695
Severance costs | Pandemic Restructuring
Restructuring charges
Restructuring charges	224	1,435		1,717	3,843
Property disposal costs | Property Restructuring
Restructuring charges
Loss on sale		915			915
Impairment loss		583		9	583
Other exit costs	19			26
Restructuring charges	19	$ 1,498		35	$ 1,498
Other restructuring costs
Restructuring charges
Restructuring charges	$ 70			$ 201

Income Taxes (Details)

Income Taxes (Details) $ in Millions	Sep. 30, 2021USD ($)
Income Taxes
Potential decrease in unrecognized tax benefit	$ 2.8

Earnings Per Share - Net Income

Earnings Per Share - Net Income Attributable to Common Stockholders (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Summary of net income attributable to Archrock common stockholders used in the calculation of basic and diluted income per common share
Net income (loss)	$ 9,304	$ 18,332	$ 22,225	$ (73,236)
Less: Earnings attributable to participating securities	(456)	(439)	(909)	(1,083)
Net income (loss) attributable to common stockholders, basic	8,848	17,893	21,316	(74,319)
Net income (loss) attributable to common stockholders, diluted	$ 8,848	$ 17,893	$ 21,316	$ (74,319)
Potential shares of common stock included in computing diluted income (loss) attributable to Archrock common stockholders
Weighted average common shares outstanding including participating securities	154,041	152,973	153,422	152,790
Less: Weighted average participating securities outstanding	(1,883)	(1,999)	(1,807)	(2,060)
Weighted average common shares outstanding used in basic net income (loss) per common share (in shares)	152,158	150,974	151,615	150,730
Weighted average common shares outstanding used in diluted net income (loss) per common share (in shares)	152,297	151,038	151,769	150,730
On exercise of options and vesting of performance-based restricted stock units
Potential shares of common stock included in computing diluted income (loss) attributable to Archrock common stockholders
Net dilutive potential common shares issuable (in shares)	138	57	152
On settlement of ESPP shares
Potential shares of common stock included in computing diluted income (loss) attributable to Archrock common stockholders
Net dilutive potential common shares issuable (in shares)	1	7	2

Earnings Per Share - Anti-dilut

Earnings Per Share - Anti-dilutive Shares (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable (shares)	15	85	27	178
On exercise of options where exercise price is greater than average market value for the period
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable (shares)	15	85	27	102
On exercise of options and vesting of performance-based restricted stock units
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable (shares)				57
On settlement of ESPP shares
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable (shares)				19

Derivatives - Interest Rate Swa

Derivatives - Interest Rate Swaps (Details) - Interest Rate Swaps $ in Millions	3 Months Ended
	Sep. 30, 2021USD ($)
Notional Disclosures
Notional amount of interest rate swaps	$ 300
Notional value dedesignated	125
Fair value of derivative prior to dedesignation	1.6
Derivatives Designated as Hedging Instruments
Notional Disclosures
Notional amount of interest rate swaps	175
Deferred pre-tax losses to be reclassified during next 12 months	$ 2.6
Weighted average effective fixed interest rate on interest rate swaps (as a percent)	1.80%

Derivatives - Effect of Derivat

Derivatives - Effect of Derivative Instruments on Balance Sheets (Details) - Interest Rate Swaps - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivatives
Derivative liabilities	$ 2,581	$ 6,337
Derivatives Designated as Hedging Instruments
Derivatives
Derivative liabilities	1,502	6,337
Derivatives Designated as Hedging Instruments | Accrued liabilities
Derivatives
Derivative liabilities	1,502	4,810
Derivatives Designated as Hedging Instruments | Other liabilities
Derivatives
Derivative liabilities		$ 1,527
Derivatives Not Designated as Hedging Instruments | Accrued liabilities
Derivatives
Derivative liabilities	$ 1,079

Derivatives - Effect of Deriv_2

Derivatives - Effect of Derivative Instruments on Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Effect of derivative instruments on results of operations
Total amount of interest expense in which the effects of cash flow hedges are recorded	$ 25,508	$ 25,221	$ 82,711	$ 80,664
Derivatives Designated as Hedging Instruments | Interest Rate Swaps
Effect of derivative instruments on results of operations
Pre-tax gain (loss) recognized in other comprehensive income (loss)	(581)	(87)	(670)	(8,399)
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Interest expense
Effect of derivative instruments on results of operations
Pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,867)	$ (1,271)	(4,440)	$ (2,594)
Derivatives Not Designated as Hedging Instruments | Interest Rate Swaps | Interest expense
Effect of derivative instruments on results of operations
Gain recognized in interest expense	$ 532		$ 532

Fair Value Measurements - Measu

Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Recurring Basis | Level 2
Fair value measurement of assets and liabilities
Derivative liabilities	$ 2,581	$ 6,337

Fair Value Measurements - Mea_2

Fair Value Measurements - Measured on Nonrecurring Basis (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)Y$ / hp	Dec. 31, 2020USD ($)$ / hp
Fair value
Goodwill impairment | $	$ 99,800	$ 99,830
Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Minimum
Fair value
Measurement input			0	0
Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Maximum
Fair value
Measurement input			621	289
Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Weighted average
Fair value
Measurement input			31	20
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Weighted average disposal period
Fair value
Measurement input | Y			4
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Discount for market liquidity
Fair value
Measurement input			0.68	0.81
Nonrecurring Basis | Level 3 | Impaired Long-Lived Assets | Compressors
Fair value
Impaired assets | $			$ 3,896	$ 19,046

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Debt (Details) - Fixed Rate Debt - Level 2 - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, fair value	$ 1,352,000	$ 1,371,000
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, fair value	$ 1,296,135	$ 1,295,867

Stock-Based Compensation - Comp

Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost
Total stock-based compensation expense	$ 3,027	$ 2,888	$ 9,862	$ 8,960
Equity awards
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost
Total stock-based compensation expense	2,900	2,645	8,741	8,423
Liability awards
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost
Total stock-based compensation expense	$ 127	$ 243	$ 1,121	$ 537

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Restricted Stock, Restricted Stock Units, Performance Units, Cash Settled Restricted Stock Units and Cash Settled Performance Units
Shares
Non-vested awards at beginning of period (in shares)	2,446
Granted (in shares)	1,287
Vested (in shares)	(1,023)
Canceled (in shares)	(72)
Non-vested awards at end of period (in shares)	2,638
Weighted Average Grant Date Fair Value Per Share
Non-vested awards at beginning of period (in dollars per share) | $ / shares	$ 9.69
Granted (in dollars per share) | $ / shares	11.20
Vested (in dollars per share) | $ / shares	9.95
Canceled (in dollars per share) | $ / shares	9.81
Non-vested awards at end of period (in dollars per share) | $ / shares	$ 10.32
Cash-settled units
Shares
Non-vested awards at end of period (in shares)	523
Stock-settled awards and units
Shares
Non-vested awards at end of period (in shares)	2,115

Stock-Based Compensation - Re_2

Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Expense (Details) - Restricted Stock, Restricted Stock Units, Performance Units, Cash Settled Restricted Stock Units and Cash Settled Performance Units $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Unrecognized compensation
Unrecognized compensation cost related to unvested awards (in dollars)	$ 16.2
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized	1 year 10 months 24 days

Commitments and Contingencies -

Commitments and Contingencies - Performance Bonds (Details) $ in Millions	Sep. 30, 2021USD ($)
Performance Bonds
Commitments and contingencies
Maximum potential undiscounted payments	$ 1.5

Commitments and Contingencies_2

Commitments and Contingencies - Tax Matters - Loss contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Non-income based tax audits
Loss Contingencies [Line Items]
Accrued liability for the outcomes of non-income based tax audits	$ 5.7	$ 5.6
Non-income based tax audits being managed by Exterran Corporation
Loss Contingencies [Line Items]
Accrued liability for the outcomes of non-income based tax audits	$ 0	$ 1.6

Related Party Transactions (Det

Related Party Transactions (Details) - Affiliated Entity shares in Millions, $ in Millions	Aug. 01, 2019directorshares	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
JDH Capital | Archrock, Inc.
Related Party Transaction
Ownership interest (percent)		11.10%		11.10%
JDH Capital and affiliates of Hilcorp
Related Party Transaction
Number of directors shareholders have right to designate | director	1
JDH Capital | Elite Acquisition | Common Stock
Related Party Transaction
Minimum ownership interest of outstanding shares required to elect a board of director (percent)	7.50%
Jeffery D. Hildebrand | Director
Related Party Transaction
Compensation paid by entity to individual in role as Director						$ 0
Jason C. Rebrook | Director
Related Party Transaction
Compensation paid by entity to individual in role as Director						0
Hilcorp and affiliates
Related Party Transaction
Revenue from related party transactions		$ 9.5	$ 9.8	$ 28.6	$ 30.7
Due from related party		$ 3.5		$ 3.5		$ 3.9
Elite Acquisition | JDH Capital | Common Stock
Related Party Transaction
Shares issued as compensation for asset acquisition (shares) | shares	21.7

Segments - Number (Details)

Segments - Number (Details)	9 Months Ended
	Sep. 30, 2021segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segments - Revenue and Gross Ma

Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue and other financial information by reportable segment
Revenue	$ 195,166	$ 205,631	$ 586,212	$ 675,644
Gross margin	103,234	119,478	318,255	383,773
Contract Operations
Revenue and other financial information by reportable segment
Revenue	158,911	175,223	488,810	570,146
Gross margin	97,631	114,779	304,778	367,661
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue	36,255	30,408	97,402	105,498
Gross margin	$ 5,603	$ 4,699	$ 13,477	$ 16,112

Segments - Reconciliation of Ne

Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation Net Income (Loss) to Gross Margin
Total gross margin	$ 103,234	$ 119,478		$ 318,255	$ 383,773
Less:
Selling, general and administrative	28,839	18,681		80,000	78,052
Depreciation and amortization	45,280	47,279		135,185	145,950
Long-lived and other asset impairment	5,121	10,727		15,154	72,132
Goodwill impairment			$ 99,800		99,830
Restructuring charges	313	2,900		1,953	7,036
Interest expense	25,508	25,221		82,711	80,664
Debt extinguishment loss					3,971
(Gain) loss on sale of assets, net	(15,393)	(9,146)		(29,549)	(11,073)
Other (income) expense, net	337	(324)		(1,634)	(1,317)
Income (loss) before income taxes	$ 13,229	$ 24,140		$ 34,435	$ (91,472)

Impact of Hurricane (Details)

Impact of Hurricane (Details) - Hurricane Ida $ in Millions	3 Months Ended
	Sep. 30, 2021USD ($)
Impact of hurricane
Depreciation expense	$ 2
Estimate of insurance deductible	$ 0.9