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Income Taxes - Reconciliation of effective income tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of income tax [Abstract]    
Earnings before taxes and non-controlling interest $ 182,512 $ 33,188
Statutory Canadian income tax rate (percent) 27.00% 27.00%
Income tax expense based on above rates $ 49,278 $ 8,961
Increase (decrease) due to:    
Non-deductible expenditures 7,271 3,929
Foreign tax rate differences 2,507 (2,160)
Change in net deferred tax assets not recognized:    
- Argentina exploration expenditures 3,117 3,372
- Other deferred tax assets (11,211) 1,168
Non-taxable portion of net earnings of affiliates (132) (3,254)
Effect of other taxes paid (mining and withholding) 21,307 14,371
Effect of foreign exchange on tax expense (7,651) 1,611
Non-taxable impact of foreign exchange 4,158 (351)
Change in non-deductible portion of reclamation liabilities 8,207 0
Change in current tax expense estimated for prior years (6,694) (5,030)
Other 1,111 (1,470)
Income taxes expense $ (71,268) $ (21,147)
Effective income tax rate (percent) 39.05% 63.72%