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Income and Mining Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Tax (expense) benefit | $ 6,400 | $ 13,113 | $ 34,526 | $ 12,018 |
Effective Income Tax Rate Reconciliation, Percent | (13.20%) |  |  |  |
Unrecognized Tax Benefits | $ 300 |  | 300 |  | $ 700
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 400 |  | 400 |  | $ 1,100
Minimum |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax liability | 500 |  | 500 |  |
Maximum |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax liability | $ 1,500 |  | $ 1,500 |  |

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