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Income Taxes (Narratives) (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
Apr. 30, 2019
Provisions [Line Items]        
Corresponding increase in tax expense $ 7,673,000 $ 4,247,000    
Letters of credit oustanding 1,593,379,000 1,573,873,000    
Income taxes refunded $ 1,521,000 (9,583,000)    
Canadian Revenue Agency [member]        
Provisions [Line Items]        
Percentage of taxes and interest charges 50.00%      
Provision for CRA transfer price dispute $ 11,000,000      
Income taxes refunded   5,500,000    
Legal proceeding legal fee recovery     $ 10,300,000  
Legal proceeding other disbursements recovery   $ 12,200,000    
Estimated amount of legal fees recoverable       $ 16,700,000