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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income and mining tax (expense) benefit at statutory rate | $ (13,161) | $ 75,185 | $ 14,052
State tax provision from continuing operations | (152) | 1,243 | 2,284
Change in valuation allowance | (17,522) | (77,220) | 2,471
Percentage depletion | 5,056 | 820 | 89
Uncertain tax positions | 2,321 | 2,358 | 1,830
U.S. and foreign permanent differences | 3,844 | 2,272 | 3,314
Foreign exchange rates | 1,390 | (7,066) | (3,973)
Foreign inflation and indexing | 684 | (2,933) | (2,374)
Foreign tax rate differences | (3,971) | 19,729 | (24)
Mining, foreign withholding, and other taxes | (17,457) | (2,746) | (3,857)
Other, net | 1,923 | (513) | 2,968
Income and mining tax benefit (expense) | $ 37,045 | $ (11,129) | $ (16,780)

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