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Shares - Common shares (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 28,458,115 29,166,630
Issued upon exercise of stock options (in shares)   125,000
Retired through share purchase programs (in shares) (2,195,646) (1,113,903)
Purchase of treasury shares (in shares) (26,012) (21,503)
Settlement of certain equity classified stock-based compensation (in shares) 184,364 301,891
Ending balance, outstanding (in shares) 26,420,821 28,458,115
Shares to satisfy recipient tax withholding requirements (in shares) 112,583,000 274,359,000
Satisfaction of recipient tax withholding $ 1,591 $ 5,134
Common shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 30,022,928 31,011,831
Issued upon exercise of stock options (in shares)   125,000
Retired through share purchase programs (in shares) (2,195,646) (1,113,903)
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 30,022,928
Treasury shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) (1,564,813) (1,845,201)
Issued upon exercise of stock options (in shares)   0
Retired through share purchase programs (in shares) 0 0
Purchase of treasury shares (in shares) (26,012) (21,503)
Settlement of certain equity classified stock-based compensation (in shares) 184,364 301,891
Ending balance, outstanding (in shares) (1,406,461) (1,564,813)