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Shareholders' Equity - Movements in capital stock (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Shareholders' Equity    
Balance at the beginning $ 372,534 $ 368,724
Exercise of stock options 406  
Balance at the end 332,507 372,534
Issued capital    
Shareholders' Equity    
Balance at the beginning $ 19 $ 16
Balance at the beginning (in shares) 14,856,581 12,620,448
Stock dividends (in shares)   2,236,133
Stock dividends   $ 3
Exercise of stock options (in shares) 42,949  
Balance at the end (in shares) 14,899,530 14,856,581
Balance at the end $ 19 $ 19
Additional paid-in capital    
Shareholders' Equity    
Balance at the beginning 312,468 312,471
Stock dividends   (3)
Exercise of stock options 602  
Balance at the end 313,070 312,468
Capital Stock and additional paid-in capital    
Shareholders' Equity    
Balance at the beginning $ 312,487 $ 312,487
Balance at the beginning (in shares) 14,856,581 12,620,448
Stock dividends (in shares)   2,236,133
Exercise of stock options (in shares) 42,949  
Exercise of stock options $ 602  
Balance at the end (in shares) 14,899,530 14,856,581
Balance at the end $ 313,089 $ 312,487