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Financial Instruments - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial liabilities [abstract]    
Total accounts payable and accrued liabilities $ 306,087 $ 281,938
Income taxes payable 59,133 54,556
Provisions 8,041 12,066
Current liabilities 387,675 361,756
Long-term provisions 240,111 229,887
Deferred credit 20,788 20,788
Deferred tax liabilities 184,785 175,311
Contingent liability for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of financial liabilities [abstract]    
Provisions 5,300 8,400
Long-term provisions 237,600 226,700
Liquidity risk [member]    
Disclosure of financial liabilities [abstract]    
Accounts payable and accrued liabilities other than: 275,629 272,266
Severance accrual 31,582 7,842
Employee compensation 3,763 6,737
Total accounts payable and accrued liabilities 310,974 286,845
Income taxes payable 59,133 54,556
Loss on derivatives 351 367
Debt: Repayment of principal 15,300  
Debt: Interest & Standby Fees 8,912 4,404
Provisions 5,291 6,843
Future employee compensation 12,410 15,864
Current liabilities 412,371 368,879
Loss on derivatives 351 367
Liquidity risk [member] | Within 1 year [member]    
Disclosure of financial liabilities [abstract]    
Accounts payable and accrued liabilities other than: 275,629 272,266
Severance accrual 26,695 2,935
Employee compensation 3,763 6,737
Total accounts payable and accrued liabilities 306,087 281,938
Income taxes payable 59,133 54,556
Loss on derivatives 351 367
Debt: Repayment of principal 3,400  
Debt: Interest & Standby Fees 2,613 2,110
Provisions 2,738 3,648
Future employee compensation 3,352 4,396
Current liabilities 377,674 347,015
Loss on derivatives 351 367
Liquidity risk [member] | 2 - 3 years [member]    
Disclosure of financial liabilities [abstract]    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 404 3,711
Employee compensation 0 0
Total accounts payable and accrued liabilities 404 3,711
Income taxes payable 0 0
Loss on derivatives 0 0
Debt: Repayment of principal 6,800  
Debt: Interest & Standby Fees 4,867 2,294
Provisions 2,553 3,109
Future employee compensation 9,058 11,468
Current liabilities 23,682 20,582
Loss on derivatives 0 0
Liquidity risk [member] | 4-5 years [member]    
Disclosure of financial liabilities [abstract]    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 33 1,120
Employee compensation 0 0
Total accounts payable and accrued liabilities 33 1,120
Income taxes payable 0 0
Loss on derivatives 0 0
Debt: Repayment of principal 5,100  
Debt: Interest & Standby Fees 1,432 0
Provisions 0 85
Future employee compensation 0 0
Current liabilities 6,565 1,205
Loss on derivatives 0 0
Liquidity risk [member] | After 5 years [member]    
Disclosure of financial liabilities [abstract]    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 4,450 76
Employee compensation 0 0
Total accounts payable and accrued liabilities 4,450 76
Income taxes payable 0 0
Loss on derivatives 0 0
Debt: Repayment of principal 0  
Debt: Interest & Standby Fees 0 0
Provisions 0 1
Future employee compensation 0 0
Current liabilities 4,450 77
Loss on derivatives $ 0 $ 0