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Income taxes - Deferred tax assets and liabilities (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Non-capital and net capital loss carryforwards | $ 44,763 | $ 24,478
Contract liabilities | 0 | 572
Finance lease obligations | 27,220 | 23,207
Stock-based compensation | 3,393 | 3,545
Other | 682 | 2,538
Subtotal | 76,058 | 54,340
Less: valuation allowance | (881) | (1,035)
Deferred tax assets, net of valuation allowance | 75,177 | 53,305
Deferred tax liabilities: |  |
Contract assets | 4,805 | 3,711
Accounts receivable – holdbacks | 924 | 96
Property, plant and equipment | 106,104 | 84,927
Deferred financing costs | 190 | 86
Deferred tax liabilities, gross | 112,023 | 88,820
Net deferred income tax liability | 36,846 | 35,515
Classified as: |  |
Deferred tax asset | 15,655 | 9,272
Deferred tax liability | (52,501) | (44,787)
Net deferred income tax liability | $ (36,846) | $ (35,515)

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