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Revenue from Contract with Customers | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer |
Revenue from Contracts with Customers | 17. Revenue from Contracts with Customers The following table presents our revenue from contracts with customers by segment (see Note 22 (“Segments”)) and disaggregated by revenue source: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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.
Performance Obligations As of December 31, 2021, we had $264.6 million of remaining performance obligations related to our contract operations segment, which will be recognized through 2026 as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026 |  | Total
Remaining performance obligations | ​ | $ | 209,241 | ​ | $ | 42,367 | ​ | $ | 11,747 | ​ | $ | 771 | ​ | $ | 471 | ​ | $ | 264,597
​ 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 Contract Assets As of December 31, 2021 and 2020, our receivables from contracts with customers, net of allowance for credit losses, were $84.7 million and $95.6 million, respectively. Contract Liabilities 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. Our contract liabilities were $4.4 million and $4.6 million as of December 31, 2021 and 2020, respectively, and were included in deferred revenue and other liabilities in our consolidated balance sheets. During the year ended December 31, 2021, we deferred revenue of $10.2 million and recognized $10.4 million as revenue. The revenue recognized and deferred during the period 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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&loc=SL49130554-203045 + Details
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