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Income taxes (Narrative) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Major Components Of Tax Expense (Income) [Line Items]    
Statutory tax rate 26.50% 26.50%
Unrecognized deferred tax liabilities $ 53,900 $ 114,600
Unrecognized deferred tax liabilities related to discontinued operations   77,000
Unrecognized deferred tax assets $ 4,707 79,515
Unrecognized deferred tax assets related to discontinued operations   $ 75,200