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Financial Instruments - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial liabilities    
Severance accrual $ 2,935 $ 994
Total accounts payable and accrued liabilities 281,938 225,330
Income taxes payable 54,556 24,770
Provisions 12,066 7,372
Current liabilities 361,756 271,670
Long-term provisions 229,887 188,012
Deferred credit 20,788 20,788
Deferred tax liabilities 175,311 176,808
Contingent liability for decommissioning, restoration and rehabilitation costs [member]    
Financial liabilities    
Provisions 8,400 3,400
Long-term provisions 226,700 185,100
Liquidity risk [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 272,266 221,488
Severance accrual 7,842 7,842
Employee compensation 6,737 2,848
Total accounts payable and accrued liabilities 286,845 232,178
Income taxes payable 54,556 24,770
Loss on commodity contracts 367  
Debt: Credit facility   275,000
Debt: Interest & Standby Fees 4,404 39,992
Provisions 6,843 6,929
Future employee compensation 15,864 10,155
Current liabilities 368,879 589,024
Loss on commodity contracts 367  
Liquidity risk [member] | Within 1 year [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 272,266 221,488
Severance accrual 2,935 994
Employee compensation 6,737 2,848
Total accounts payable and accrued liabilities 281,938 225,330
Income taxes payable 54,556 24,770
Loss on commodity contracts 367  
Debt: Credit facility   0
Debt: Interest & Standby Fees 2,110 12,952
Provisions 3,648 3,979
Future employee compensation 4,396 1,444
Current liabilities 347,015 268,475
Loss on commodity contracts 367  
Liquidity risk [member] | 2 - 3 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 3,711 5,967
Employee compensation 0 0
Total accounts payable and accrued liabilities 3,711 5,967
Income taxes payable 0 0
Loss on commodity contracts 0  
Debt: Credit facility   0
Debt: Interest & Standby Fees 2,294 27,040
Provisions 3,109 633
Future employee compensation 11,468 8,711
Current liabilities 20,582 42,351
Loss on commodity contracts 0  
Liquidity risk [member] | 4-5 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 1,120 772
Employee compensation 0 0
Total accounts payable and accrued liabilities 1,120 772
Income taxes payable 0 0
Loss on commodity contracts 0  
Debt: Credit facility   275,000
Debt: Interest & Standby Fees 0 0
Provisions 85 1,350
Future employee compensation 0 0
Current liabilities 1,205 277,122
Loss on commodity contracts 0  
Liquidity risk [member] | After 5 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 76 109
Employee compensation 0 0
Total accounts payable and accrued liabilities 76 109
Income taxes payable 0 0
Loss on commodity contracts 0  
Debt: Credit facility   0
Debt: Interest & Standby Fees 0 0
Provisions 1 967
Future employee compensation 0 0
Current liabilities 77 $ 1,076
Loss on commodity contracts $ 0