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Revenue from Contract with Customers (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer |
Disaggregation of Revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2021 |  | 2020 |  | 2019
Contract operations: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
0 ― 1,000 horsepower per unit | ​ | $ | 175,457 | ​ | $ | 224,702 | ​ | $ | 259,985
1,001 ― 1,500 horsepower per unit | ​ |  | 267,191 | ​ |  | 305,185 | ​ |  | 316,082
Over 1,500 horsepower per unit | ​ |  | 204,893 | ​ |  | 206,749 | ​ |  | 191,510
Other (1) | ​ |  | 770 | ​ |  | 2,282 | ​ |  | 3,962
Total contract operations revenue (2) | ​ |  | 648,311 | ​ |  | 738,918 | ​ |  | 771,539
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Aftermarket services: | ​ |  |  | ​ |  |  | ​ |  |
Services (3) | ​ |  | 69,876 | ​ |  | 79,012 | ​ |  | 122,076
OTC parts and components sales | ​ |  | 63,274 | ​ |  | 57,040 | ​ |  | 71,870
Total aftermarket services revenue (4) | ​ |  | 133,150 | ​ |  | 136,052 | ​ |  | 193,946
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total revenue | ​ | $ | 781,461 | ​ | $ | 874,970 | ​ | $ | 965,485
(1) | Primarily relates to fees associated with owned non-compression equipment.
(2) | Includes $4.0 million, $5.6 million and $7.9 million during the years ended December 31, 2021, 2020 and 2019, 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) | Includes a reversal of $0.9 million of revenue during the year ended December 31, 2019 related to changes in estimates of performance obligations partially satisfied in prior periods.
(4) | Services revenue within aftermarket services is recognized over time. OTC parts and components sales revenue is recognized at a point in time.
Schedule of remaining Performance Obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026 |  | Total
Remaining performance obligations | ​ | $ | 209,241 | ​ | $ | 42,367 | ​ | $ | 11,747 | ​ | $ | 771 | ​ | $ | 471 | ​ | $ | 264,597

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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 + Details
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