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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Examination [Line Items] |  |  |
Current Other Tax Expense (Benefit) | $ (67) | $ (55) | $ (24)
Income tax (expense) benefit | (16,780) | 28,998 | (33,247)
United States |  |  |
Income Tax Examination [Line Items] |  |  |
Deferred federal income tax expense (benefit) | 23,322 | 6,367 | (1,610)
United States - Alternative Minimum tax [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Current federal tax expense (benefit) | 1,188 | 1,428 | 0
United States — State mining taxes |  |  |
Income Tax Examination [Line Items] |  |  |
Current federal tax expense (benefit) | (3,208) | (6,016) | (7,826)
Deferred federal income tax expense (benefit) | 1,134 | 1,052 | 748
United States — Foreign withholding tax |  |  |
Income Tax Examination [Line Items] |  |  |
Current federal tax expense (benefit) | (5,617) | (8,466) | (1,838)
Australia |  |  |
Income Tax Examination [Line Items] |  |  |
Deferred Other Tax Expense (Benefit) | 449 | (1,560) | 1,550
Canada |  |  |
Income Tax Examination [Line Items] |  |  |
Current foreign tax expense (benefit) | 378 | 876 | (1,841)
Deferred foreign income tax expense (benefit) | 16,057 | 104 | 1,338
Mexico |  |  |
Income Tax Examination [Line Items] |  |  |
Current foreign tax expense (benefit) | (26,021) | (30,763) | (9,581)
Deferred foreign income tax expense (benefit) | $ 9,929 | $ 4,805 | $ 55,383

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