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REVENUES (Tables) | 9 Months Ended
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Sep. 30, 2021
REVENUES |
Schedule of disaggregation of revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Oilfield services transferred at a point in time | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Oilfield services transferred over time |  | ​ | 225,310 |  | ​ | 116,588 | ​ | ​ | 596,677 |  | ​ | 449,665
Total revenues | ​ | $ | 225,310 | ​ | $ | 116,588 | ​ | $ | 596,677 | ​ | $ | 449,665
Schedule of contract assets included in accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(in thousands) |  | 2021 |  | 2020
Unbilled trade receivables | ​ | $ | 52,710 | ​ | $ | 29,574

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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=123351226&loc=SL49130545-203045 + Details
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