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Income Taxes - Reconciliation of effective income tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of income tax [Abstract]    
Earnings before taxes and non-controlling interest $ 252,012 $ 182,512
Statutory Canadian income tax rate (percent) 27.00% 27.00%
Income tax expense based on above rates $ 68,043 $ 49,278
Increase (decrease) due to:    
Non-deductible expenditures 9,915 7,271
Foreign tax rate differences 16,179 2,507
Change in net deferred tax assets not recognized:    
- Argentina exploration expenditures (3,485) 3,117
- Other deferred tax assets (61,280) (11,211)
Effect of other taxes paid (mining and withholding) 22,545 21,307
Effect of foreign exchange on tax expense 18,598 (7,651)
Non-taxable impact of foreign exchange (3,000) 4,158
Change in non-deductible portion of reclamation liabilities 8,605 8,207
Change in current tax expense estimated for prior years 0 (6,694)
Other (563) 979
Income taxes expense $ (75,557) $ (71,268)
Effective income tax rate (percent) 29.98% 39.05%