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Income Taxes - Significant components of unrecognized deferred tax assets (Details) - CAD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 433,034	$ 401,853
Income tax losses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	270,154	259,770
Property, plant and equipment, deferred tax assets [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	2,344	2,076
Provision for reclamation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	88,036	71,463
Long-term investments and other, deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 72,500	$ 68,544