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Income taxes - Deferred tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Non-capital and net capital loss carryforwards $ 44,763 $ 24,478
Contract liabilities 0 572
Finance lease obligations 27,220 23,207
Stock-based compensation 3,393 3,545
Other 682 2,538
Subtotal 76,058 54,340
Less: valuation allowance (881) (1,035)
Deferred tax assets, net of valuation allowance 75,177 53,305
Deferred tax liabilities:    
Contract assets 4,805 3,711
Accounts receivable – holdbacks 924 96
Property, plant and equipment 106,104 84,927
Deferred financing costs 190 86
Deferred tax liabilities, gross 112,023 88,820
Net deferred income tax liability 36,846 35,515
Classified as:    
Deferred tax asset 15,655 9,272
Deferred tax liability (52,501) (44,787)
Net deferred income tax liability $ (36,846) $ (35,515)