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Income taxes Income Taxes - Deferred Tax Assets and Liabilities (Details) - CAD CAD in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Deferred tax assets: |  |
Non-capital losses | CAD 16,443 | CAD 31,151
Deferred financing costs | 1,027 | 1,135
Billings in excess of costs on uncompleted contracts | 123 | 0
Capital lease obligations | 16,860 | 16,148
Deferred lease inducements | 39 | 64
Stock-based compensation | 1,619 | 1,666
Other | 636 | 481
Deferred tax assets, gross | 36,747 | 50,645
Deferred tax liabilities: |  |
Unbilled revenue and uncertified revenue included in accounts receivable | 3,689 | 9,538
Assets held for sale | 49 | 6,466
Accounts receivable – holdbacks | 0 | 3,084
Property, plant and equipment | 59,472 | 58,134
Deferred Tax Liabilities, Gross | 63,210 | 77,222
Net deferred income tax liability | (26,463) | (26,577)
Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred tax asset | 15,845 | 35,556
Deferred tax liability | CAD (42,308) | CAD (62,133)

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