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Shares - Common shares (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 26,420,821 28,458,115
Retired through share purchase programs (in shares)   (2,195,646)
Purchase of treasury shares (in shares) (20,955) (26,012)
Settlement of certain equity classified stock-based compensation (in shares) 337,229 184,364
Ending balance, outstanding (in shares) 26,737,095 26,420,821
Shares to satisfy recipient tax withholding requirements (in shares) 234,728,000 112,583,000
Satisfaction of recipient tax withholding $ 5,479 $ 1,591
Common shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 27,827,282 30,022,928
Retired through share purchase programs (in shares)   (2,195,646)
Purchase of treasury shares (in shares) 0 0
Settlement of certain equity classified stock-based compensation (in shares) 0 0
Ending balance, outstanding (in shares) 27,827,282 27,827,282
Treasury shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) (1,406,461) (1,564,813)
Retired through share purchase programs (in shares)   0
Purchase of treasury shares (in shares) (20,955) (26,012)
Settlement of certain equity classified stock-based compensation (in shares) 337,229 184,364
Ending balance, outstanding (in shares) (1,090,187) (1,406,461)