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Revenue from Contract with Customers (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(in thousands) |  | 2021 |  | 2020
Contract operations: | ​ | ​ |  | ​ | ​ |
0 ― 1,000 horsepower per unit | ​ | $ | 46,919 | ​ | $ | 66,740
1,001 ― 1,500 horsepower per unit | ​ |  | 68,464 | ​ |  | 84,852
Over 1,500 horsepower per unit | ​ |  | 50,403 | ​ |  | 54,591
Other (1) | ​ |  | 248 | ​ |  | 791
Total contract operations (2) | ​ |  | 166,034 | ​ |  | 206,974
​ | ​ | ​ | ​ | ​ | ​ | ​
Aftermarket services: | ​ |  |  | ​ |  |
Services | ​ |  | 16,892 | ​ |  | 25,450
OTC parts and components sales | ​ |  | 12,505 | ​ |  | 17,273
Total aftermarket services (3) | ​ |  | 29,397 | ​ |  | 42,723
​ | ​ | ​ | ​ | ​ | ​ | ​
Total revenue | ​ | $ | 195,431 | ​ | $ | 249,697
(1) | Primarily relates to fees associated with owned non-compression equipment.
(2) | Includes $1.0 million and $1.6 million for the three months ended March 31, 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 service 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 |  | Total
Remaining performance obligations | ​ | $ | 205,343 | ​ | $ | 89,252 | ​ | $ | 15,014 | ​ | $ | 1,860 | ​ | $ | 168 | ​ | $ | 311,637
Summary of changes in the allowance for credit losses balance | ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
Balance at December 31, 2020 |  | $ | 3,370
Provision for credit losses | ​ | ​ | 224
Write-offs charged against allowance | ​ | ​ | (300)
Balance at March 31, 2021 | ​ | $ | 3,294

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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