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REVENUES (Tables) | 9 Months Ended
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Sep. 30, 2019
REVENUES |
Schedule of disaggregation of revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Oilfield services transferred at a point in time | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Oilfield services transferred over time | ​ |  | 293,240 | ​ |  | 439,994 | ​ |  | 986,412 | ​ |  | 1,344,254
Total revenues | ​ | $ | 293,240 | ​ | $ | 439,994 | ​ | $ | 986,412 | ​ | $ | 1,344,254
​
Schedule of contract assets included in accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31, |  | September 30, |  | December 31,
(in thousands) | ​ | 2019 | ​ | 2018 | ​ | 2018 | ​ | 2017
Unbilled trade receivables | ​ | $ | 55,837 | ​ | $ | 56,408 | ​ | $ | 102,760 | ​ | $ | 68,494
​

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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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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