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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)

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