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Intangible asset (Reconciliation of carrying amount of intangible assets) (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year $ 43,577  
Intangible assets, end of year 39,822 $ 43,577
Cost [Member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year 118,819 118,819
Intangible assets, end of year 118,819 118,819
Accumulated amortization [Member]    
Reconciliation of carrying amount [Line Items]    
Intangible assets, beginning of year (75,242) (71,758)
Amortization charge (3,755) (3,484)
Intangible assets, end of year $ (78,997) $ (75,242)