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Income and Mining Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Tax (expense) benefit | $ (8,658) | $ 11,949 |
Effective Income Tax Rate Reconciliation, Percent | 25.80% | 94.50% |
Unrecognized Tax Benefits | $ 3,100 |  | $ 3,800
Minimum |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized income tax liability | 3,500 |  |
Maximum |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized income tax liability | $ 4,500 |  |

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