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Long-term debt - Disclosure of detailed information about borrowings (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Borrowings [abstract]      
Convertible debentures $ 350,000 $ 350,000  
Revolving credit facility 19,482 30,000  
Long-term debt 369,482 380,000  
Unamortized debt issuance costs (6,733) (8,867)  
Unamortized accretion on convertible debentures (13,707) (18,364)  
Long-term debt, net of issuance costs 349,042 352,769  
Current portion 0 0  
Non-current portion 349,042 352,769  
Long-term debt $ 349,042 $ 352,769 $ 464,308