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Income taxes - Deferred tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Non-capital and net capital loss carryforwards $ 33,630 $ 40,367
Finance lease obligations 17,981 24,785
Operating lease obligations 3,415 3,247
Stock-based compensation 4,200 4,029
Other 2,241 (1,154)
Deferred tax assets, net of valuation allowance 61,467 71,274
Deferred tax liabilities:    
Contract assets 3,199 932
Property, plant and equipment 123,274 124,265
Other 6,494 2,277
Deferred tax liabilities, gross 132,967 127,474
Net deferred income tax liability 71,500 56,200
Classified as:    
Deferred tax asset 387 0
Deferred tax liability (71,887) (56,200)
Net deferred income tax liability $ (71,500) $ (56,200)