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Other long term obligations - Other liabilities and obligations (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Deferred lease inducements liability [Roll Forward]        
Balance, beginning of year $ 10 $ 38    
Addition 1,412 0    
Amortization of deferred lease inducements (3) (28)    
Balance, end of year 10 38 $ 1,419 $ 10
Asset retirement obligation [Roll Forward]        
Balance, beginning of year 744 678    
Accretion expense 74 66    
Balance, end of year $ 818 744    
Estimated undiscounted cash flows required to settle obligation     $ 1,084 $ 1,084
Credit adjusted risk-free rate assumed in measuring the asset retirement obligation (percent) 9.42%      
Deferred gain on sale-leaseback [Roll Forward]        
Addition $ 2,262 5,155    
Amortization of deferred gain on sale-leaseback (1,478) (700)    
Balance, end of year 8,438 7,654    
Other Liabilities, Sublease Income [Roll Forward]        
Balance, beginning of year 0 0    
Addition 1,732 0    
Amortization of loss (197) 0    
Balance, end of year $ 1,535 $ 0