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Income and Mining Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Tax Examination [Line Items] |  |
Valuation allowance | $ 272,839 | $ 282,868
United States |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | 223,444 | 235,395
Canada |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | 7,661 | 2,455
Mexico |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | 17,606 | 17,087
New Zealand |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | 22,482 | 23,792
Other |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | $ 1,646 | $ 4,139

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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