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Revenue from Contract with Customers (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents our revenue from contracts with customers disaggregated by revenue source (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2020 |  | 2019 |  | 2018
Contract operations (1): | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
0 - 1,000 horsepower per unit | ​ | $ | 224,702 | ​ | $ | 259,985 | ​ | $ | 241,810
1,001 - 1,500 horsepower per unit | ​ |  | 305,185 | ​ |  | 316,082 | ​ |  | 276,775
Over 1,500 horsepower per unit | ​ |  | 206,749 | ​ |  | 191,510 | ​ |  | 149,783
Other (2) | ​ |  | 2,282 | ​ |  | 3,962 | ​ |  | 4,168
Total contract operations (3) | ​ |  | 738,918 | ​ |  | 771,539 | ​ |  | 672,536
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Aftermarket services (1): | ​ |  |  | ​ |  |  | ​ |  |
Services (4) | ​ |  | 79,012 | ​ |  | 122,076 | ​ |  | 142,476
OTC parts and components sales | ​ |  | 57,040 | ​ |  | 71,870 | ​ |  | 89,429
Total aftermarket services (5) | ​ |  | 136,052 | ​ |  | 193,946 | ​ |  | 231,905
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total revenue | ​ | $ | 874,970 | ​ | $ | 965,485 | ​ | $ | 904,441
(1) | We operate in two segments: contract operations and aftermarket services. See Note 28 (“Segments”) for further details regarding our segments.
(2) | Primarily relates to fees associated with owned non-compression equipment.
(3) | Includes $5.6 million, $7.9 million and $6.6 million for the years ended December 31, 2020, 2019 and 2018, 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.
(4) | 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.
(5) | All service revenue within aftermarket services is recognized over time. All OTC parts and components sales revenue is recognized at a point in time.
Remaining Performance Obligation | As of December 31, 2020, we had $350.0 million of remaining performance obligations related to our contract operations segment. Our remaining performance obligations will be recognized through 2025 as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Total
Remaining performance obligations | ​ | $ | 252,807 | ​ | $ | 82,366 | ​ | $ | 13,216 | ​ | $ | 1,436 | ​ | $ | 168 | ​ | $ | 349,993

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