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Shares - Net income per share (Details) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jun. 01, 2021
Mar. 20, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ 67,372 $ 51,408    
Interest from convertible debentures (after tax) 5,893 4,410    
Diluted net income available to common shareholders $ 73,265 $ 55,818    
Weighted average number of common shares (in shares) 27,406,140 28,325,489    
Weighted-average effect of dilutive securities        
Dilutive effect of treasury shares (in shares) 1,485,275 1,707,718    
Dilutive effect of stock options (in shares) 0 47,767    
Weighted average number of diluted common shares (in shares) 34,006,850 33,946,957    
Basic net income per share (in CAD per share) $ 2.46 $ 1.81    
Diluted net income per share (in CAD per share) $ 2.15 $ 1.64    
5.00% convertible debentures        
Weighted-average effect of dilutive securities        
Dilutive effect of convertible debentures (in shares) 2,095,236 2,095,236    
5.50% convertible debentures        
Weighted-average effect of dilutive securities        
Dilutive effect of convertible debentures (in shares) 3,020,199 1,770,747    
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% 5.50% 5.50%