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Income taxes - Deferred tax assets and liabilities (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Non-capital and net capital loss carryforwards | $ 40,758 | $ 44,763
Finance lease obligations | 27,736 | 27,220
Stock-based compensation | 2,872 | 3,393
Other | 1,990 | 682
Subtotal | 73,356 | 76,058
Less: valuation allowance | (391) | (881)
Deferred tax assets, net of valuation allowance | 72,965 | 75,177
Deferred tax liabilities: |  |
Contract assets | 1,524 | 4,805
Property, plant and equipment | 117,768 | 106,104
Other | 1,461 | 1,114
Deferred tax liabilities, gross | 120,753 | 112,023
Net deferred income tax liability | 47,788 | 36,846
Classified as: |  |
Deferred tax asset | 16,407 | 15,655
Deferred tax liability | (64,195) | (52,501)
Net deferred income tax liability | $ (47,788) | $ (36,846)

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