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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenues |
Schedule of disaggregation of revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | 2020 |  | 2019 |  | 2018
Oilfield services transferred at a point in time | ​ | $ | — | ​ | $ | — | ​ | $ | —
Oilfield services transferred over time | ​ | ​ | 598,302 |  | ​ | 1,222,409 |  | ​ | 1,721,005
Total revenues | ​ | $ | 598,302 | ​ | $ | 1,222,409 | ​ | $ | 1,721,005
Schedule of contract assets included in accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019
Unbilled trade receivables | ​ | $ | 29,754 | ​ | $ | 52,052

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