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Other assets - Intangible assets (Details) - CAD
CAD in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Cost CAD 18,188 CAD 18,122
Accumulated Amortization 17,250 16,332
Net book value 938 1,790
Internally developed computer software capitalized during the period 66 304
Amortization of intangible assets (note 10(b)) 918 1,688
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 464  
2019 266  
2020 149  
2021 59  
Net book value CAD 938 CAD 1,790