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Income taxes - Deferred tax assets and liabilities (Details) - CAD
CAD in Thousands
Dec. 31, 2016
Dec. 31, 2015
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)