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Income and Mining Taxes - Summary of Tax Credit Carryforwards (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Tax Credit Carryforward [Line Items] |
Regular net operating losses | $ 650,936
Capital losses | 87,431
Alternative minimum tax credits | 793
Foreign tax credits | 30,358
United States |
Tax Credit Carryforward [Line Items] |
Regular net operating losses | 423,572
Capital losses | 87,431
Alternative minimum tax credits | 793
Foreign tax credits | 30,358
Canada |
Tax Credit Carryforward [Line Items] |
Regular net operating losses | 82,383
Capital losses | 0
Alternative minimum tax credits | 0
Foreign tax credits | 0
Mexico |
Tax Credit Carryforward [Line Items] |
Regular net operating losses | 58,688
Capital losses | 0
Alternative minimum tax credits | 0
Foreign tax credits | 0
New Zealand |
Tax Credit Carryforward [Line Items] |
Regular net operating losses | 82,378
Capital losses | 0
Alternative minimum tax credits | 0
Foreign tax credits | 0
Other |
Tax Credit Carryforward [Line Items] |
Regular net operating losses | 3,915
Capital losses | 0
Alternative minimum tax credits | 0
Foreign tax credits | $ 0

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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