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Income and Mining Taxes Valuation Allowance (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | $ 375,911 | $ 436,829
UNITED STATES |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | 292,446 | 292,677
ARGENTINA |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | 6,197 | 8,376
CANADA |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | 1,296 | 1,718
BOLIVIA |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | 37,372 | 45,177
Mexico |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | 13,033 | 63,373
NEW ZEALAND |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | 23,717 | 25,508
Other Countries |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | $ 1,850 | $ 0

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