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v3.19.3.a.u2

Revenues (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Revenues |
Schedule of disaggregation of revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2019 |  | 2018 |  | 2017
Oilfield services transferred at a point in time | ​ | $ | — | ​ | $ | — | ​ | $ | —
Oilfield services transferred over time |  | ​ | 1,222,409 |  | ​ | 1,721,005 |  | ​ | 1,595,227
Total revenues | ​ | $ | 1,222,409 | ​ | $ | 1,721,005 | ​ | $ | 1,595,227
Schedule of contract assets included in accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2019 |  | 2018
Unbilled trade receivables | ​ | $ | 52,052 | ​ | $ | 56,408

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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=118956577&loc=SL49130545-203045 + Details
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