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Income Taxes - Reconciliation of effective income tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of income tax [Abstract]    
Earnings before taxes and non-controlling interest $ 182,485 $ 176,271
Statutory Canadian income tax rate (percent) 26.00% 26.00%
Income tax expense based on above rates $ 47,446 $ 45,830
Increase (decrease) due to:    
Non-deductible expenditures 4,618 5,082
Foreign tax rate differences 3,644 9,729
Change in net deferred tax assets not recognized:    
- Argentina exploration expenditures 2,051 1,794
- Other deferred tax assets (10,752) (14,406)
Non-taxable portion of net earnings of affiliates (4,055) (4,852)
Changes to temporary differences 0 1,429
Tax on sale of royalty 1,400 0
Effect of other taxes paid (mining and withholding) 20,065 13,678
Effect of foreign exchange on tax expense (3,928) 10,462
Non-taxable impact of foreign exchange 2,937 3,861
Change in current tax expense estimated for prior years (3,503) 0
Other (889) 1,839
Income taxes expense $ (59,034) $ (74,446)
Effective income tax rate (percent) 32.35% 42.23%