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Income and Mining Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |
Tax (expense) benefit | $ (3,939) | $ (8,658) |
Effective Income Tax Rate Reconciliation, Percent | (24.90%) | 25.80% |
Unrecognized Tax Benefits | $ 700 |  | $ 2,700
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 900 |  | $ 2,300
Minimum |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized income tax liability | 500 |  |
Maximum |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized income tax liability | $ 1,500 |  |

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