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Stock-based compensation - Restricted share unit plan (Details) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Performance restricted share units (PSUs)    
Number of units    
Beginning balance (in shares) 431,714 426,569
Granted (in shares) 101,597 116,775
Vested (in shares) (213,623) (111,630)
Ending balance (in shares) 319,688 431,714
Weighted-average exercise price $ per share    
Outstanding, beginning of period (CAD per unit) $ 12.47 $ 12.06
Granted, Weighted average exercise price (CAD per unit) 25.62 15.55
Vested, Weighted average exercise price (CAD per unit) 8.48 14.13
Outstanding, end of period (CAD per unit) $ 19.32 $ 12.47
Vested (in shares) 213,623 111,630
Liability classified restricted share unit plan | Restricted share units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Period for recognition in years following grant 2 years  
Award vesting period 3 years  
Restricted share unit plan | Restricted share units (RSUs)    
Number of units    
Beginning balance (in shares) 535,898 553,411
Granted (in shares) 199,468 167,631
Vested (in shares) (256,193) (169,689)
Forfeited (in shares) (13,867) (15,455)
Ending balance (in shares) 465,306 535,898
Weighted-average exercise price $ per share    
Outstanding, beginning of period (CAD per unit) $ 14.44 $ 13.55
Granted, Weighted average exercise price (CAD per unit) 27.44 15.55
Vested, Weighted average exercise price (CAD per unit) 8.77 14.13
Forfeited, Weighted average exercise price (CAD per unit) 17.60 13.41
Outstanding, end of period (CAD per unit) $ 23.04 $ 14.44
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements $ 5,662 $ 3,479
Period for award recognition 1 year 7 months 6 days 1 year 3 months 18 days
Vested (in shares) 256,193 169,689
Restricted share unit plan | Performance restricted share units (PSUs)    
Number of units    
Vested (in shares) (213,623) (111,630)
Weighted-average exercise price $ per share    
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements $ 3,655 $ 3,251
Period for award recognition 1 year 6 months 1 year 3 months 18 days
Vested (in shares) 213,623 111,630