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Stock-based compensation - Performance and deferred stock unit plan (Details)
12 Months Ended
Jan. 01, 2021
$ / shares
shares
Dec. 31, 2022
CAD ($)
$ / shares
shares
Dec. 31, 2021
CAD ($)
$ / shares
shares
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Current portion of DSU liabilities | $   $ 5,099,000 $ 0  
Performance restricted share units (PSUs)        
Number of units        
Beginning balance (in shares) 492,557 426,569 492,557  
Granted (in shares)   116,775 112,079  
Vested/redeemed (in shares)   (111,630) (178,067)  
Ending balance (in shares)   431,714 426,569  
Weighted-average exercise price $ per share        
Outstanding, beginning of period (CAD per unit) | $ / shares $ 8.86 $ 12.06 $ 8.86  
Granted, Weighted average exercise price (CAD per unit) | $ / shares   15.55 20.04  
Vested/redeemed, Weighted average exercise price (CAD per unit) | $ / shares   14.13 8.24  
Outstanding, end of period (CAD per unit) | $ / shares   $ 12.47 $ 12.06  
Vested (in shares)   111,630 178,067  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Risk-free interest rate   3.14% 0.65%  
Expected volatility   48.70% 50.96%  
Performance restricted share unit plan | Performance restricted share units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance restricted share unit plan granted to the services to be provided   2 years    
Award vesting period   3 years    
Restricted share unit plan | Performance restricted share units (PSUs)        
Number of units        
Vested/redeemed (in shares)   (111,630) (178,067)  
Weighted-average exercise price $ per share        
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements | $   $ 3,251,000 $ 3,702,000  
Period for award recognition   1 year 3 months 18 days 1 year 6 months  
Vested (in shares)   111,630 178,067  
Settlement ratio, per PSU (in shares)   1.14 2.0  
Deferred stock unit plan | Deferred stock units (DSUs)        
Number of units        
Beginning balance (in shares) 1,005,503 932,644 1,005,503  
Granted (in shares)   87,569 66,265  
Vested/redeemed (in shares)   0 (139,124)  
Ending balance (in shares)   1,020,213 932,644  
Weighted-average exercise price $ per share        
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements | $   $ 0    
Vested (in shares)   0 139,124  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Required annual fixed remuneration in form of DSUs if shareholding guidelines are met, percentage 60.00%      
Percentage of annual bonus eligible for deferred stock units 50.00%      
Fair market value (CAD per share) | $ / shares   $ 17.90 $ 18.78  
Award units settled during the period | $   $ 0 $ 2,300,000  
Deferred stock unit plan | Deferred stock units (DSUs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Required annual fixed remuneration in form of DSUs, percentage       50.00%
Required annual fixed remuneration in form of DSUs if shareholding guidelines are not met, percentage 0.00%      
Deferred stock unit plan | Deferred stock units (DSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Required annual fixed remuneration in form of DSUs, percentage       100.00%
Required annual fixed remuneration in form of DSUs if shareholding guidelines are not met, percentage 100.00%      
Deferred stock unit plan | Deferred stock units (DSUs) | Accrued liabilities        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Current portion of DSU liabilities | $   5,099,000 0  
Deferred stock unit plan | Deferred stock units (DSUs) | Other liabilities        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Non-current portion of award obligation | $   $ 13,159,000 $ 17,515,000