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Income and Mining Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |
Tax (expense) benefit | $ 218 | $ 3,785 | $ (13,986) | $ 19,451 |
Effective Income Tax Rate Reconciliation, Percent | 1.60% | 7.70% | 15.60% | 64.90% |
Unrecognized Tax Benefits | $ 2,600 |  | $ 2,600 |  | $ 3,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 2,200 |  | 2,200 |  | $ 3,700
Minimum |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax liability | 2,500 |  | 2,500 |  |
Maximum |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax liability | $ 3,500 |  | $ 3,500 |  |

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