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Income taxes - Deferred tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Non-capital and net capital loss carryforwards $ 24,478 $ 18,619
Deferred financing costs 0 52
Contract liabilities 572 222
Capital lease obligations 23,207 17,961
Stock-based compensation 3,545 2,985
Other 2,538 2,357
Subtotal 54,340 42,196
Less: valuation allowance (1,035) (1,035)
Deferred tax assets, net of valuation allowance 53,305 41,161
Deferred tax liabilities:    
Contract assets 3,711 5,231
Assets held for sale 116 1,523
Accounts receivable – holdbacks 96 72
Property, plant and equipment 84,811 61,953
Deferred financing costs 86 0
Deferred tax liabilities, gross 88,820 68,779
Net deferred income tax liability 35,515 27,618
Classified as:    
Deferred tax asset 9,272 10,539
Deferred tax liability (44,787) (38,157)
Net deferred income tax liability $ (35,515) $ (27,618)