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Intangible assets (Goodwill and intangible assets) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year $ 51,247  
Intangible assets, end of year 47,117 $ 51,247
Cost [Member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 229,437 230,207
Effect of movements in exchange rates 8,027 (770)
Intangible assets, end of year 237,464 229,437
Accumulated amortization [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year (178,190) (174,385)
Amortization charge (4,193) (4,557)
Effect of movements in exchange rates (7,964) 752
Intangible assets, end of year (190,347) (178,190)
Contracts [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 732  
Intangible assets, end of year 56 732
Contracts [member] | Cost [Member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 110,618 111,388
Effect of movements in exchange rates 8,027 (770)
Intangible assets, end of year 118,645 110,618
Contracts [member] | Accumulated amortization [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year (109,886) (109,663)
Amortization charge (739) (975)
Effect of movements in exchange rates (7,964) 752
Intangible assets, end of year (118,589) (109,886)
Intellectual Property [member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 50,515  
Intangible assets, end of year 47,061 50,515
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 (68,304) (64,722)
Amortization charge (3,454) (3,582)
Effect of movements in exchange rates 0 0
Intangible assets, end of year $ (71,758) $ (68,304)