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Income taxes - Expense (benefit) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]    
Income before income taxes $ 85,963 $ 84,445
Equity earnings in affiliates and joint ventures (25,815) (37,053)
Income (loss) from continuing operations $ 60,148 $ 47,392
Tax rate 23.00% 23.00%
Expected expense $ 13,834 $ 10,900
Adjustments related to:    
Stock-based compensation 1,092 1,090
Foreign tax rate differential 2,164 183
Tax on equity earnings in affiliates and joint ventures 5,936 5,162
Other (204) (262)
Total income tax expense 22,822 17,073
Current income tax expense 6,841 1,627
Deferred income tax expense $ 15,981 $ 15,446