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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 75,931 $ 56,556
Deferred tax liabilities (267,599) (76,055)
Net deferred tax liabilities (191,668) (19,499)
Net deferred tax liabilities (191,668) (19,499)
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 19,499 20,915
Deferred income tax (recovery) expense through income statement (3,870) (1,416)
Deferred income tax expense through equity 176,039  
Ending balance 191,668 19,499
Reclamation and closure cost obligation [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 15,872 13,080
Carried forward tax loss [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 4,192 17,729
Accounts payable and accrued liability [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 19,370 16,437
Deductibility of resource taxes [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 3,085 3,414
Lease obligations [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 8,270 5,769
Other deferred tax assets [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 1,153 127
Mineral Properties [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities (244,296) (55,134)
Mining and foreign withholding taxes [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities (4,523) (4,862)
Equipment and Building [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 23,989  
Deferred tax liabilities   (1,928)
Convertible Debentures [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities (1,198) (1,544)
Inflation [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities (10,163) (11,210)
Other deferred tax liabilities [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities $ (7,419) $ (1,377)