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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, 2023
Dec. 31, 2022
Major components of tax expense (income) [abstract]    
(Loss) earnings from continuing operations before income taxes $ (35,086) $ 113,123
Income tax provision on continuing operations calculated using the combined Canadian federal and provincial statutory income tax rate (9,298) 29,978
Increase (decrease) in income taxes resulting from:    
Non-deductible expenses, net 97 335
Non-taxable portion of capital losses, net 13,179 3,422
Differences in foreign statutory tax rates 1,100 (4,056)
Changes in unrecognized deferred tax assets 9,868 (367)
Foreign withholding taxes 283 482
Adjustments in respect of prior years (2,289) (2,716)
Other 317 760
Total income tax expense on continuing operations $ 13,257 $ 27,838