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Income Taxes (Significant components of unrecognized deferred tax assets) (Details) - CAD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | $ 437,010 | $ 415,749
Income tax losses (gains) [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | 337,749 | 288,637
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 | 2,297 | 2,209
Provision for reclamation [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | 78,336 | 66,573
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 | $ 18,628 | $ 58,330

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