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Share-based compensation - Disclosure of deferred and restricted share units, fair value (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Carrying value $ 0 $ 3,494
Intrinsic value of vested units 0 2,800
DSU and RSU [Member] | Current portion [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Carrying value 0 3,494
Intrinsic value of vested units 0 2,800
DSU and RSU [Member] | Non-current portion [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Carrying value 0 0
Intrinsic value of vested units $ 0 $ 0