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Segment Information - Reconciliation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2017
Successor |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Mining revenue | $ 302,958 | $ 44,395 |  | $ 129,810 | $ 895,802
Other revenues | 8,997 | 8,496 |  | 14,555 | 33,487
Revenues | 311,955 | 52,891 |  | 144,365 | 929,289
Successor | Segment Reconciling Items |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other revenues | 8,997 | 8,496 |  | 14,555 | 33,487
Predecessor |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Mining revenue |  |  | $ 65,154 |  |
Other revenues |  |  | 6,229 |  |
Revenues |  |  | 71,383 |  |
Predecessor | Segment Reconciling Items |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other revenues |  |  | 6,229 |  |
Mining | Successor | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Mining revenue | $ 302,958 | $ 44,395 |  | $ 129,810 | $ 895,802
Mining | Predecessor | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Mining revenue |  |  | $ 65,154 |  |

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