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Income Taxes - Reconciliation of effective income tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of income tax [Abstract]    
Earnings before taxes and non-controlling interest $ 33,188 $ 182,485
Statutory Canadian income tax rate (percent) 27.00% 26.00%
Income tax expense based on above rates $ 8,961 $ 47,446
Increase (decrease) due to:    
Non-deductible expenditures 3,929 4,618
Foreign tax rate differences (2,160) 3,644
Change in net deferred tax assets not recognized:    
- Argentina exploration expenditures 3,372 2,051
- Other deferred tax assets 1,168 (10,752)
Non-taxable portion of net earnings of affiliates (3,254) (4,055)
Tax on sale of royalty 0 1,400
Effect of other taxes paid (mining and withholding) 14,371 20,065
Effect of foreign exchange on tax expense 1,611 (3,928)
Non-taxable impact of foreign exchange (351) 2,937
Change in current tax expense estimated for prior years (5,030) (3,503)
Other (1,470) (889)
Income taxes expense $ (21,147) $ (59,034)
Effective income tax rate (percent) 63.72% 32.35%