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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)

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