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Revenue from Contract with Customers (Tables) | 9 Months Ended
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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

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