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Shares - Net income per share (Details) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Apr. 30, 2020
Apr. 06, 2020
Mar. 23, 2020
Mar. 15, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Net income available to common shareholders $ 49,208 $ 36,878        
Interest from convertible debentures (after tax) 2,370 3,590        
Diluted net income available to common shareholders $ 51,578 $ 40,468        
Weighted average number of common shares (in shares) 28,165,130 25,444,374        
Weighted-average effect of dilutive securities            
Dilutive effect of treasury shares (in shares) 1,949,717 1,898,645        
Dilutive effect of stock options (in shares) 90,741 255,378        
Weighted average number of diluted common shares (in shares) 32,300,824 32,843,211        
Basic net income per share (in CAD per share) $ 1.75 $ 1.45        
Diluted net income per share (in CAD per share) $ 1.60 $ 1.23        
FIve Point Zero Percent Convertible Debentures            
Weighted-average effect of dilutive securities            
Dilutive effect of convertible debentures (in shares) 2,095,236 1,647,487        
Five Point Five Zero Percent Convertible Debentures            
Weighted-average effect of dilutive securities            
Dilutive effect of convertible debentures (in shares) 0 3,597,327        
Convertible Subordinated Debt | FIve Point Zero Percent Convertible Debentures            
Weighted-average effect of dilutive securities            
Interest rate 5.00% 5.00%        
Convertible Subordinated Debt | Five Point Five Zero Percent Convertible Debentures            
Weighted-average effect of dilutive securities            
Interest rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%