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Income Taxes - Significant components of deferred tax assets and liabilities (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings $ 22,425 $ 138,656  
Deferred tax assets 861,171 835,985  
Deferred tax liabilities (12,467) (15,937)  
Net deferred tax asset 848,704 820,048 $ 678,495
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 (4,325) 118,853  
Net deferred tax assets 115,193 118,853  
Net deferred tax liabilities 0 0  
Provision for reclamation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings (16,760) (11,001)  
Net deferred tax assets 227,785 244,012  
Inventories [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 1,027 0  
Net deferred tax assets 1,027 0  
Net deferred tax liabilities 0 12,430  
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 16 (43)  
Net deferred tax assets 5,295 5,279  
Income tax losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 57,203 (22,093)  
Net deferred tax assets 459,885 402,550  
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 7,845 5,691  
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 (27,166) (25,589)  
Net deferred tax assets 31,674 56,093  
Deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings 9,995 60,127  
Net deferred tax assets 848,704 832,478  
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 0 (68,385)  
Inventories [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings (12,430) (10,144)  
Deferred tax liabilities [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset, recognized in earnings (12,430) (78,529)  
Net deferred tax liabilities $ 0 $ 12,430