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Income taxes - Deferred tax assets and liabilities (Details) - CAD CAD in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Deferred tax assets: |  |
Non-capital losses | CAD 14,190 | CAD 16,443
Deferred financing costs | 355 | 1,027
Billings in excess of costs on uncompleted contracts | 289 | 123
Capital lease obligations | 16,578 | 16,860
Deferred lease inducements | 10 | 39
Stock-based compensation | 2,672 | 1,619
Other | 1,263 | 636
Deferred tax assets, gross | 35,357 | 36,747
Deferred tax liabilities: |  |
Unbilled revenue | 3,381 | 3,689
Assets held for sale | 67 | 49
Accounts receivable – holdbacks | 143 | 0
Property, plant and equipment | 58,180 | 59,472
Deferred tax liabilities, gross | 61,771 | 63,210
Net deferred income tax liability | (26,414) | (26,463)
Classified as: |  |
Deferred tax asset | 13,807 | 15,845
Deferred tax liability | CAD (40,221) | CAD (42,308)

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