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Income Taxes - Reconciliation of effective income tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of income tax [Abstract]    
Earnings before taxes and non-controlling interest $ 244,991 $ 252,012
Statutory Canadian income tax rate (percent) 27.00% 27.00%
Income tax expense based on above rates $ 66,148 $ 68,043
Increase (decrease) due to:    
Non-deductible expenditures 6,192 9,915
Foreign tax rate differences 15,969 16,179
Change in net deferred tax assets not recognized 20,574 (64,765)
Non-taxable portion of net earnings of affiliates (1,304) 0
Effect of other taxes paid (mining and withholding) 25,846 22,545
Effect of foreign exchange on tax expense 14,337 18,598
Non-taxable impact of foreign exchange (1,203) (3,000)
Change in non-deductible portion of reclamation liabilities 2,380 8,605
Other (2,510) (563)
Income taxes expense $ (146,429) $ (75,557)