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Revenue from Contract with Customers | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Revenue from Contracts with Customers | 17. Revenue from Contracts with Customers 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.
Performance Obligations 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
​ 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 As of December 31, 2020 and 2019, our receivables from contracts with customers, net of allowance for credit losses, were $95.6 million and $139.4 million, respectively. 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. As of December 31, 2020 and 2019, our contract liabilities were $4.6 million and $11.4 million, respectively, which were included in deferred revenue and other liabilities in our consolidated balance sheets. The decrease in the contract liability balance during the year ended December 31, 2020 was primarily due to $19.5 million recognized as revenue during the period, partially offset by revenue deferral of $12.7 million, each primarily related to freight billings and milestone billings on aftermarket services.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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