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Income and Mining Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Tax (expense) benefit | $ 37,045 | $ (11,129) | $ (16,780)
Unrecognized Tax Benefits | 700 | 2,700 | 3,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 1,100 | $ 2,300 | $ 3,500
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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