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Income taxes - Deferred tax assets and liabilities (Details) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Non-capital and net capital loss carryforwards | $ 24,478 | $ 18,619
Deferred financing costs | 0 | 52
Contract liabilities | 572 | 222
Capital lease obligations | 23,207 | 17,961
Stock-based compensation | 3,545 | 2,985
Other | 2,538 | 2,357
Subtotal | 54,340 | 42,196
Less: valuation allowance | (1,035) | (1,035)
Deferred tax assets, net of valuation allowance | 53,305 | 41,161
Deferred tax liabilities: |  |
Contract assets | 3,711 | 5,231
Assets held for sale | 116 | 1,523
Accounts receivable – holdbacks | 96 | 72
Property, plant and equipment | 84,811 | 61,953
Deferred financing costs | 86 | 0
Deferred tax liabilities, gross | 88,820 | 68,779
Net deferred income tax liability | 35,515 | 27,618
Classified as: |  |
Deferred tax asset | 9,272 | 10,539
Deferred tax liability | (44,787) | (38,157)
Net deferred income tax liability | $ (35,515) | $ (27,618)

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