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Income and Mining Taxes - Income and Mining Tax (Expense) Benefit (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Examination [Line Items] |  |  |
Current Other Tax Expense (Benefit) | $ 33 | $ (3) | $ 67
Deferred Other Tax Expense (Benefit) | 0 | 0 | (449)
Income tax (expense) benefit | (37,045) | 11,129 | 16,780
United States |  |  |
Income Tax Examination [Line Items] |  |  |
Current federal tax expense (benefit) | (226) | 334 | (1,188)
Deferred federal income tax expense (benefit) | 49 | (236) | (23,322)
United States — State mining taxes |  |  |
Income Tax Examination [Line Items] |  |  |
Current federal tax expense (benefit) | 8,384 | 4,001 | 3,208
Deferred federal income tax expense (benefit) | 354 | (251) | (1,134)
United States — Foreign withholding tax |  |  |
Income Tax Examination [Line Items] |  |  |
Current federal tax expense (benefit) | 800 | 1,598 | 5,617
Canada |  |  |
Income Tax Examination [Line Items] |  |  |
Current foreign tax expense (benefit) | (232) | (119) | (378)
Deferred foreign income tax expense (benefit) | 0 | (32,084) | (16,057)
Mexico |  |  |
Income Tax Examination [Line Items] |  |  |
Current foreign tax expense (benefit) | 36,066 | 19,619 | 26,021
Deferred foreign income tax expense (benefit) | $ (8,117) | $ (3,994) | $ (9,929)

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