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Income taxes - Deferred tax assets and liabilities (Details) - CAD CAD in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Deferred tax assets: |  |
Tax credit carryforwards | CAD 18,619 | CAD 15,225
Deferred financing costs | 52 | 355
Billings in excess of costs on uncompleted contracts | 222 | 289
Capital lease obligations | 17,961 | 16,578
Stock-based compensation | 2,985 | 2,672
Other | 2,357 | 1,273
Deferred tax assets, gross | 42,196 | 36,392
Less: valuation allowance | (1,035) | (1,035)
Deferred tax assets, net of valuation allowance | 41,161 | 35,357
Deferred tax liabilities: |  |
Unbilled revenue | 5,231 | 3,381
Assets held for sale | 1,523 | 67
Accounts receivable – holdbacks | 72 | 143
Property, plant and equipment | 61,953 | 58,180
Deferred tax liabilities, gross | 68,779 | 61,771
Net deferred income tax liability | (27,618) | (26,414)
Classified as: |  |
Deferred tax asset | 10,539 | 13,807
Deferred tax liability | CAD (38,157) | CAD (40,221)

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