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Income taxes Income Taxes - Deferred Tax Assets and Liabilities (Details) - CAD
CAD in Thousands
Dec. 31, 2015
Dec. 31, 2014
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)