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Segment Information - Reconciliation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Total revenues | $ 226,720 | $ 378,290
Mining | Mining | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 221,338 | 369,681
All other |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 5,382 | $ 8,609
All other | Segment Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 5,382 |

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