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Shares - Net income per share (Details) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jun. 01, 2021
Mar. 20, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ 63,141 $ 67,372    
Interest from convertible debentures (after tax) 5,925 5,893    
Diluted net income available to common shareholders $ 69,066 $ 73,265    
Weighted average number of common shares (in shares) 26,566,846 27,406,140    
Weighted-average effect of dilutive securities        
Dilutive effect of treasury shares (in shares) 1,260,436 1,485,275    
Weighted average number of diluted common shares (in shares) 33,026,740 34,006,850    
Basic net income per share (in CAD per share) $ 2.38 $ 2.46    
Diluted net income per share (in CAD per share) $ 2.09 $ 2.15    
5.00% convertible debentures        
Weighted-average effect of dilutive securities        
Dilutive effect of convertible debentures (in shares) 2,148,438 2,095,236    
5.50% convertible debentures        
Weighted-average effect of dilutive securities        
Dilutive effect of convertible debentures (in shares) 3,051,020 3,020,199    
Convertible Subordinated Debt | 5.00% convertible debentures        
Weighted-average effect of dilutive securities        
Interest rate 5.00%     5.00%
Convertible Subordinated Debt | 5.50% convertible debentures        
Weighted-average effect of dilutive securities        
Interest rate 5.50%   5.50%