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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other operating activities    
Share-based compensation expense $ 3,024 $ 4,448
Gains on securities held (58,673) (83,705)
Gains on commodity and foreign currency contracts (Note 9d) (3,543) (3,315)
(Gain) loss on derivatives (Note 9d) (38) 14
Share of income from associate and dilution gain (Note 14) (10,529) (15,245)
Net realizable value adjustment for inventories (16,175) (356)
Project development write-down 0 1,882
Other inflows (outflows) of cash, classified as operating activities (85,934) (96,277)
Changes in non-cash operating working capital items:    
Trade and other receivables 54,838 1,545
Inventories (14,623) 22,753
Prepaid expenses 2,353 (4,093)
Accounts payable and accrued liabilities 56,816 (43,527)
Provisions (2,402) (4,622)
Changes in non-cash working capital 96,982 (27,944)
Significant non-cash items:    
Shares issued as compensation (Note 26) 2,826 2,693
Cash and Cash Equivalents    
Cash in banks 167,113 120,564
Issued capital    
Significant non-cash items:    
Shares issued as compensation (Note 26) $ 2,826 $ 2,693