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Income Taxes - Deductible Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 655,330 $ 852,770
Tax loss (revenue in nature)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 284,626 202,181
Net tax loss (capital in nature)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 32,378 34,646
Resource pools and other tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 48,773 260,413
Financing fees    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 2,003 2,849
Mineral properties, plant, and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 58,644 118,380
Closure and decommissioning costs    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 136,728 141,018
Exploration and other expenses not currently deductible    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 33,587 53,595
Intercompany debt    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 12,160 11,339
Doubtful debt and inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 41,378 23,895
Payroll and vacation accruals    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 1,491 1,055
Other temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 3,562 $ 3,399