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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Schedule of disaggregation of revenues |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Oil field services transferred at a point in time |  | $ | - |  |  | $ | - |  |  | $ | - |
Oil field services transferred over time |  |  | 1,721,005 |  |  |  | 1,595,227 |  |  |  | 728,974 |
Total revenues |  | $ | 1,721,005 |  |  | $ | 1,595,227 |  |  | $ | 728,974 |
Schedule of contract assets included in accounts receivable |
(in thousands) |  | 2018 |  |  | 2017 |
Unbilled trade receivables |  | $ | 56,408 |  |  | $ | 68,494 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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