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Income taxes - Deferred tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Non-capital and net capital loss carryforwards $ 13,740 $ 26,713
Finance lease obligations 26,541 23,116
Accrued liabilities 5,721 3,211
Operating lease obligations 3,116 6,161
Stock-based compensation 5,542 4,913
Contingent obligations 17,200 1,229
Acquisition costs 1,470 1,858
Other 7,051 5,611
Deferred tax assets 80,381 72,812
Deferred tax liabilities:    
Contract assets 602 5,693
Property, plant and equipment 179,581 168,813
Investments in affiliates and joint ventures 12,387 2,266
Operating lease right-of-use assets 3,002 2,827
Deferred financing costs 1,114 1,355
Other 9,073 682
Deferred tax liabilities 205,759 181,636
Net deferred income tax liability 125,378 108,824
Classified as:    
Deferred tax asset 0 0
Deferred tax liability (125,378) (108,824)
Net deferred income tax liability $ (125,378) $ (108,824)