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Financial Instruments - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial liabilities [abstract]      
Total accounts payable and accrued liabilities $ 308,054 $ 306,087  
Income tax payables 25,833 59,133  
Provisions 303,180 248,152  
Current liabilities 380,840 387,675  
Current (17,853) (8,041)  
Long-term provisions (285,327) (240,111)  
Deferred credit 20,788 20,788  
Deferred tax liabilities 140,337 184,785  
Contingent liability for decommissioning, restoration and rehabilitation costs [member]      
Disclosure of financial liabilities [abstract]      
Provisions 296,228 242,861 $ 235,110
Current (14,400) (5,300)  
Long-term provisions (281,800) (237,600)  
Liquidity risk [member]      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 291,436 275,629  
Severance liabilities 20,033 31,582  
Payroll liabilities 2,758 3,763  
Total accounts payable and accrued liabilities 314,227 310,974  
Income tax payables 25,833 59,133  
Derivative liabilities 1,780 351  
Debt: Repayment of principal 193,722 15,300  
Debt: Interest & Standby Fees 29,028 8,912  
Provisions 6,952 5,291  
Future payroll liabilities 11,124 12,410  
Current liabilities 582,666 412,371  
Liquidity risk [member] | Within 1 year [member]      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 291,436 275,629  
Severance liabilities 13,860 26,695  
Payroll liabilities 2,758 3,763  
Total accounts payable and accrued liabilities 308,054 306,087  
Income tax payables 25,833 59,133  
Derivative liabilities 1,780 351  
Debt: Repayment of principal 13,712 3,400  
Debt: Interest & Standby Fees 11,222 2,613  
Provisions 3,448 2,738  
Future payroll liabilities 2,465 3,352  
Current liabilities 366,514 377,674  
Liquidity risk [member] | 2 - 3 years [member]      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0 0  
Severance liabilities 1,039 404  
Payroll liabilities 0 0  
Total accounts payable and accrued liabilities 1,039 404  
Income tax payables 0 0  
Derivative liabilities 0 0  
Debt: Repayment of principal 173,435 6,800  
Debt: Interest & Standby Fees 17,681 4,867  
Provisions 2,423 2,553  
Future payroll liabilities 8,659 9,058  
Current liabilities 203,237 23,682  
Liquidity risk [member] | 4-5 years [member]      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0 0  
Severance liabilities 645 33  
Payroll liabilities 0 0  
Total accounts payable and accrued liabilities 645 33  
Income tax payables 0 0  
Derivative liabilities 0 0  
Debt: Repayment of principal 6,575 5,100  
Debt: Interest & Standby Fees 125 1,432  
Provisions 0 0  
Future payroll liabilities 0 0  
Current liabilities 7,345 6,565  
Liquidity risk [member] | After 5 years [member]      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0 0  
Severance liabilities 4,489 4,450  
Payroll liabilities 0 0  
Total accounts payable and accrued liabilities 4,489 4,450  
Income tax payables 0 0  
Derivative liabilities 0 0  
Debt: Repayment of principal 0 0  
Debt: Interest & Standby Fees 0 0  
Provisions 1,081 0  
Future payroll liabilities 0 0  
Current liabilities $ 5,570 $ 4,450