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Financial Instruments - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial liabilities    
Severance accrual $ 994 $ 1,791
Total accounts payable and accrued liabilities 225,330 131,743
Provisions 7,372 5,072
Income taxes payable 24,770 8,306
Current liabilities 271,670 150,528
Long-term provisions 188,012 70,083
Deferred credit 20,788 20,788
Deferred tax liabilities 176,808 148,819
Contingent liability for decommissioning, restoration and rehabilitation costs [member]    
Financial liabilities    
Provisions 3,400 1,900
Long-term provisions 185,100 68,600
Liquidity risk [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 221,488 128,486
Severance accrual 7,842 6,200
Employee compensation 2,848 1,466
Total accounts payable and accrued liabilities 232,178 136,152
Debt: Credit facility 275,000  
Debt: Interest 39,992 1,550
Loss on commodity contracts   51
Provisions 6,929 4,568
Income taxes payable 24,770 8,306
Lease obligations 60,995 19,260
Future employee compensation 10,155 6,441
Current liabilities 650,019 176,328
Liquidity risk [member] | Within 1 year [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 221,488 128,486
Severance accrual 994 1,791
Employee compensation 2,848 1,466
Total accounts payable and accrued liabilities 225,330 131,743
Debt: Credit facility 0  
Debt: Interest 12,952 1,200
Loss on commodity contracts   51
Provisions 3,979 3,123
Income taxes payable 24,770 8,306
Lease obligations 16,221 7,947
Future employee compensation 1,444 1,530
Current liabilities 284,696 153,900
Liquidity risk [member] | 2 - 3 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 5,967 3,763
Employee compensation 0 0
Total accounts payable and accrued liabilities 5,967 3,763
Debt: Credit facility 0  
Debt: Interest 27,040 350
Loss on commodity contracts   0
Provisions 633 547
Income taxes payable 0 0
Lease obligations 15,906 7,898
Future employee compensation 8,711 4,911
Current liabilities 58,257 17,469
Liquidity risk [member] | 4-5 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 772 534
Employee compensation 0 0
Total accounts payable and accrued liabilities 772 534
Debt: Credit facility 275,000  
Debt: Interest 0 0
Loss on commodity contracts   0
Provisions 1,350 720
Income taxes payable 0 0
Lease obligations 7,193 2,885
Future employee compensation 0 0
Current liabilities 284,315 4,139
Liquidity risk [member] | After 5 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 109 112
Employee compensation 0 0
Total accounts payable and accrued liabilities 109 112
Debt: Credit facility 0  
Debt: Interest 0 0
Loss on commodity contracts   0
Provisions 967 178
Income taxes payable 0 0
Lease obligations 21,675 530
Future employee compensation 0 0
Current liabilities $ 22,751 $ 820