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Income taxes - Disclosure of detailed information about income taxes (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Current income tax on continuing operations    
Expense for the year $ 1,150 $ 1,231
Current income tax expense on continuing operations 1,150 1,231
Deferred income tax (Note 21 (b)) on continuing operations:    
Origination and reversal of temporary differences 29,011 24,759
Change in unrecognized deductible temporary differences (367) (367)
Other (1,956) 303
Deferred income tax expense on continuing operations 26,688 24,695
Income tax expense on continuing operations $ 27,838 $ 25,926