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Segment Information - Reconciliation of Capital Expenditures (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 14,172 | $ 25,979 | $ 23,651 | $ 48,754
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 299 | 2,789 | 1,159 | 3,727
Mining | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 13,873 | $ 23,190 | $ 22,492 | $ 45,027

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