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Income and other taxes - Schedule of Deferred Income Tax Liabilities and Deferred Tax Expense (Recovery) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (liabilities)/assets $ (92,477) $ (54,085) $ (74,072)
Deferred income tax expense/(recovery) 38,392 (20,170)  
Deferred tax charged to equity 0 (183)  
Operating loss carry-forwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (liabilities)/assets 29,454 58,042  
Deferred income tax expense/(recovery) 28,588 11,045  
Current assets and liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (liabilities)/assets 5,965 789  
Deferred income tax expense/(recovery) (5,176) (811)  
Derivatives      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (liabilities)/assets 0 1,857  
Deferred income tax expense/(recovery) 1,857 1,900  
Mining interests      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (liabilities)/assets (147,955) (131,792)  
Deferred income tax expense/(recovery) 16,163 (25,605)  
Mine restoration provisions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (liabilities)/assets 21,897 19,398  
Deferred income tax expense/(recovery) (2,499) (4,158)  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (liabilities)/assets (1,838) (2,379)  
Deferred income tax expense/(recovery) $ (541) $ (2,358)