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Income taxes - Expense (benefit) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]    
Income before income taxes $ 84,445 $ 60,693
Equity earnings in affiliates and joint ventures (37,053) (21,860)
Income (loss) from continuing operations $ 47,392 $ 38,833
Tax rate 23.00% 23.00%
Expected expense $ 10,900 $ 8,932
Adjustments related to:    
Stock-based compensation 1,090 1,043
Foreign tax rate differential 183 233
Tax on equity earnings in affiliates and joint ventures 5,162 935
Other (262) (1,858)
Total income tax expense 17,073 9,285
Current income tax expense 1,627 1,000
Deferred income tax expense $ 15,446 $ 8,285