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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Income and mining tax (expense) benefit at statutory rate |  | $ 14,052 | $ (14,037) | $ 3,718
State tax provision from continuing operations |  | 2,284 | 26 | 336
Change in valuation allowance |  | 2,471 | 86,712 | 40,517
Effect of tax legislation |  | 0 | (88,174) | 0
Percentage depletion |  | 89 | 703 | 983
Uncertain tax positions |  | 1,830 | 2,596 | (8,829)
U.S. and foreign permanent differences |  | 3,314 | 2,348 | (2,652)
Foreign exchange rates |  | (3,973) | (14,180) | 19,701
Foreign inflation and indexing |  | (2,374) | (2,346) | (670)
Foreign tax rate differences |  | (24) | 2,929 | 120
Mining, foreign withholding, and other taxes |  | (3,857) | (11,274) | (11,052)
Other, net |  | 2,968 | 5,699 | 0
Legal entity reorganization |  | 0 | 0 | $ (8,925)
Income and mining tax benefit (expense) | $ (16,780) | $ 28,998 | $ (33,247) |

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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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