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Income taxes - Deferred tax assets and liabilities (Details) - CAD
CAD in Thousands
Dec. 31, 2017
Dec. 31, 2016
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)