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Income taxes - Deferred tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Non-capital and net capital loss carryforwards $ 26,713 $ 33,630
Finance lease obligations 23,116 17,981
Operating lease obligations 6,161 3,415
Stock-based compensation 4,913 4,200
Transaction costs 1,858 0
Other 10,051 2,241
Deferred tax assets, net of valuation allowance 72,812 61,467
Deferred tax liabilities:    
Contract assets 5,693 3,199
Property, plant and equipment 168,813 123,274
Other 7,130 6,494
Deferred tax liabilities, gross 181,636 132,967
Net deferred income tax liability 108,824 71,500
Classified as:    
Deferred tax asset 0 387
Deferred tax liability (108,824) (71,887)
Net deferred income tax liability $ (108,824) $ (71,500)