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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Examination [Line Items] |  |  |  |
Income tax (expense) benefit | $ 28,998 | $ (33,247) | $ (29,075) |
United States |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Deferred federal income tax expense (benefit) |  | 6,367 | (1,610) | $ (564)
United States - Alternative Minimum tax [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Current federal tax expense (benefit) |  | 1,428 | 0 | 49
United States — State mining taxes |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Current federal tax expense (benefit) |  | (6,016) | (7,826) | (4,305)
Deferred federal income tax expense (benefit) |  | 1,052 | 748 | 1,952
United States — Foreign withholding tax |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Current federal tax expense (benefit) |  | (8,466) | (1,838) | 0
Argentina |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Current foreign tax expense (benefit) |  | 55 | 10 | 715
Deferred foreign income tax expense (benefit) |  | 1,531 | 115 | (1,197)
Australia |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Current foreign tax expense (benefit) |  | 0 | 14 | 130
Deferred foreign income tax expense (benefit) |  | 0 | (1,638) | 3,223
Canada |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Current foreign tax expense (benefit) |  | 876 | (1,841) | (516)
Deferred foreign income tax expense (benefit) |  | 104 | 1,338 | 2,875
Mexico |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Current foreign tax expense (benefit) |  | (30,763) | (9,581) | (476)
Deferred foreign income tax expense (benefit) |  | 4,805 | 55,383 | 27,189
New Zealand |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Deferred foreign income tax expense (benefit) |  | $ 29 | $ (27) | $ 0

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