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Income Taxes - Significant components of unrecognized deferred tax assets (Details) - CAD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 408,809	$ 428,113
Income tax losses (gains) [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	271,163	280,330
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	2,204	2,321
Provision for reclamation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	75,219	75,082
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	$ 60,223	$ 70,380