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Revenue from Contracts with Customers | 6 Months Ended
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Jun. 30, 2023
Revenue from Contracts with Customers |
Revenue from Contracts with Customers | 8. Revenue from Contracts with Customers ​ The following table presents our revenue from contracts with customers by segment and disaggregated by revenue source: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Contract operations: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
0 ― 1,000 horsepower per unit | ​ | $ | 43,176 | ​ | $ | 40,489 | ​ | $ | 83,130 | ​ | $ | 82,331
1,001 ― 1,500 horsepower per unit | ​ |  | 88,008 | ​ |  | 68,697 | ​ |  | 169,814 | ​ |  | 135,698
Over 1,500 horsepower per unit | ​ |  | 69,672 | ​ |  | 56,885 | ​ |  | 135,386 | ​ |  | 111,479
Other (1) | ​ |  | 264 | ​ |  | 227 | ​ |  | 535 | ​ |  | 446
Total contract operations revenue (2) | ​ |  | 201,120 | ​ |  | 166,298 | ​ |  | 388,865 | ​ |  | 329,954
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Aftermarket services: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Services | ​ |  | 24,567 | ​ |  | 26,001 | ​ |  | 45,816 | ​ |  | 43,138
OTC parts and components sales | ​ |  | 21,856 | ​ |  | 23,529 | ​ |  | 42,696 | ​ |  | 39,937
Total aftermarket services revenue (3) | ​ |  | 46,423 | ​ |  | 49,530 | ​ |  | 88,512 | ​ |  | 83,075
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total revenue | ​ | $ | 247,543 | ​ | $ | 215,828 | ​ | $ | 477,377 | ​ | $ | 413,029
(1) | Primarily relates to fees associated with owned non-compression equipment.
(2) | Includes $1.1 million and $0.9 million for the three months ended June 30, 2023 and 2022, respectively, and $1.9 million and $1.1 million for the six months ended June 30, 2023 and 2022, 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) | Services revenue within aftermarket services is recognized over time. OTC parts and components sales revenue is recognized at a point in time.
​ See Note 15 (“Segment Information”) for further information on segments. Performance Obligations ​ As of June 30, 2023, we had $413.4 million of remaining performance obligations related to our contract operations segment, which will be recognized through 2028 as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2024 | ​ | 2025 |  | 2026 |  | 2027 |  | 2028 |  | Total
Remaining performance obligations | ​ | $ | 179,142 | ​ | $ | 142,684 | ​ | $ | 66,507 | ​ | $ | 20,055 | ​ | $ | 4,246 | ​ | $ | 795 | ​ | $ | 413,429
​ 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 June 30, 2023 and December 31, 2022, our receivables from contracts with customers, net of allowance for credit losses, were $115.7 million and $111.9 million, respectively. Allowance for Credit Losses ​ Our allowance for credit losses balance changed as follows during the six months ended June 30, 2023: ​
​ | ​ | ​ | ​
(in thousands) |  | ​ | ​
Balance at beginning of period |  | $ | 1,674
Benefit from credit losses | ​ | ​ | (140)
Write-offs charged against allowance | ​ | ​ | (440)
Balance at end of period | ​ | $ | 1,094
​ 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. As of June 30, 2023 and December 31, 2022, our contract liabilities were $6.4 million and $8.0 million, respectively. During the six months ended June 30, 2023, we deferred revenue of $7.1 million and recognized $8.8 million as revenue. The revenue recognized 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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org//606/tableOfContent + Details
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