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Intangible assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year $ 60,410  
Intangible assets, end of year 55,822 $ 60,410
Cost [Member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 232,526 238,190
Effect of movements in exchange rates (2,319) (5,664)
Intangible assets, end of year 230,207 232,526
Accumulated amortization [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year (172,116) (172,588)
Amortization charge (4,708) (5,049)
Effect of movements in exchange rates 2,439 5,521
Intangible assets, end of year (174,385) (172,116)
Contracts [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 2,613  
Intangible assets, end of year 1,725 2,613
Contracts [member] | Cost [Member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 113,707 119,371
Effect of movements in exchange rates (2,319) (5,664)
Intangible assets, end of year 111,388 113,707
Contracts [member] | Accumulated amortization [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year (111,094) (115,434)
Amortization charge (1,008) (1,181)
Effect of movements in exchange rates 2,439 5,521
Intangible assets, end of year (109,663) (111,094)
Intellectual Property [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 57,797  
Intangible assets, end of year 54,097 57,797
Intellectual Property [member] | Cost [Member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 118,819 118,819
Effect of movements in exchange rates 0 0
Intangible assets, end of year 118,819 118,819
Intellectual Property [member] | Accumulated amortization [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year (61,022) (57,154)
Amortization charge (3,700) (3,868)
Effect of movements in exchange rates 0 0
Intangible assets, end of year $ (64,722) $ (61,022)