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Long-term debt - Disclosure of detailed information of long-term debt, activity (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Balance - January 1 $ 352,769 $ 464,308
Increase in revolving credit facility 19,772 0
Decrease in revolving credit facility (30,000) (123,475)
Amortization of transaction costs 2,134 2,036
Accretion expense 4,657 4,456
Foreign exchange revaluation impact (290) 5,444
Balance - December 31 $ 349,042 $ 352,769