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Income Taxes - Significant components of deferred tax assets and liabilities (Details) - CAD ($)
$ 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]      
Net deferred tax asset, recognized in earnings $ 147,091 $ 22,425  
Deferred tax assets 1,006,012 861,171  
Deferred tax liabilities 0 (12,467)  
Net deferred tax asset 1,006,012 848,704 $ 820,048
Property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 119,132 (4,325)  
Net deferred tax assets 245,206 115,193  
Provision for reclamation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings (36,622) (16,760)  
Net deferred tax assets 191,189 227,785  
Inventories [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 1,137 1,027  
Net deferred tax assets 2,163 1,027  
Net deferred tax liabilities 0 0  
Foreign exploration and development [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings (14) 16  
Net deferred tax assets 5,281 5,295  
Income tax losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 39,289 57,203  
Net deferred tax assets 499,180 459,885  
Defined benefit plan actuarial losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 0 0  
Net deferred tax assets 5,646 7,845  
Long-term investments and other, deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 24,169 (27,166)  
Net deferred tax assets 57,347 31,674  
Deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 147,091 9,995  
Net deferred tax assets 1,006,012 848,704  
Inventories [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 0 (12,430)  
Deferred tax liabilities [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 0 (12,430)  
Net deferred tax liabilities $ 0 $ 0