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Income and Mining Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Examination [Line Items] |  |
Valuation allowance | $ 401,304 | $ 371,277
United States |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | 215,396 | 213,783
Canada |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | 146,611 | 118,738
Mexico |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | 15,885 | 15,884
New Zealand |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | 22,740 | 21,863
Other jurisdictions |  |
Income Tax Examination [Line Items] |  |
Valuation allowance | $ 672 | $ 1,009

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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://www.xbrl.org/2003/role/disclosureRef -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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