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Income and Mining Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Income and mining tax (expense) benefit at statutory rate | $ (14,037) | $ 3,718 | $ 110,848
State tax provision from continuing operations | 26 | 336 | (2,075)
Change in valuation allowance | 86,712 | 40,517 | (70,457)
Effect of tax legislation | (88,174) | 0 | 0
Percentage depletion | 703 | 983 | 0
Uncertain tax positions | 2,596 | (8,829) | 170
U.S. and foreign permanent differences | 2,348 | (2,652) | (3,376)
Mineral interest related | 0 | 0 | (18,318)
Foreign exchange rates | (14,180) | 19,701 | 21,461
Foreign inflation and indexing | (2,346) | (670) | 1,117
Foreign tax rate differences | 2,929 | 120 | (14,062)
Mining, foreign withholding, and other taxes | (11,274) | (11,052) | 8,141
Other, net | 5,699 | 0 | (4,374)
Legal entity reorganization | 0 | (8,925) | 0
Income and mining tax benefit (expense) | $ 28,998 | $ (33,247) | $ (29,075)

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory tax rates to pretax income (loss) from continuing operations attributable to legal entity reorganizations. + References No definition available. + Details
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