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Income taxes - Disclosure of reconciliation of statutory weighted average tax rate applicable to income (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income taxes [Abstract]    
Income from continuing operations before income taxes $ 113,123 $ 102,553
Income tax provision on continuing operations calculated using the combined Canadian federal and provincial statutory income tax rate 29,978 27,176
Increase (decrease) in income taxes resulting from:    
Non-deductible expenses, net 1,568 255
(Non-deductible) non-taxable portion of capital losses, net 2,189 (806)
Differences in foreign statutory tax rates (4,056) (2,770)
Changed in unrecognized deferred tax assets (367) (367)
Foreign withholding taxes 482 864
Other (1,956) 1,574
Total income tax expense on continuing operations $ 27,838 $ 25,926