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Shareholders' equity - Capital stock and contributed surplus (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Stated value    
Equity at beginning of period $ 277,271 $ 291,219
Shares acquired for equity incentive plan (5,252) (6,948)
Shares issued on exercise of stock options   1,127
Stock-based compensation 20,411 17,041
Shares issued on vesting of RSUs (3,197) (2,925)
Shares issued to purchase management contracts   4,000
Shares acquired and canceled under normal course issuer bid (4,157) (3,036)
Shares issued under dividend reinvestment program (25,847) (25,781)
Equity at end of period $ 305,705 $ 277,271
Capital stock    
Number of shares    
Number of shares outstanding at beginning of period (shares) 25,325,894 24,991,620
Shares acquired for equity incentive plan (shares) (154,131) (180,594)
Shares issued on exercise of stock options (shares)   115,102
Shares released on vesting of equity incentive plan (shares)   324,568
Shares issued and released on vesting of RSUs (shares) 31,680 80,345
Shares issued to purchase management contract (shares) 331,672 72,464
Shares acquired and canceled under normal course issuer bid (shares) (126,353) (81,538)
Shares issued under dividend reinvestment program (shares) 1,389 3,927
Number of shares outstanding at end of period (shares) 25,410,151 25,325,894
Stated value    
Equity at beginning of period $ 428,475 $ 417,425
Shares acquired for equity incentive plan (5,252) (6,948)
Shares issued on exercise of stock options   1,807
Shares released on vesting of equity incentive plan 14,247 12,867
Shares issued on vesting of RSUs 1,402 2,210
Shares issued to purchase management contracts   4,000
Shares acquired and canceled under normal course issuer bid (4,157) (3,036)
Shares issued under dividend reinvestment program 49 150
Equity at end of period 434,764 428,475
Contributed surplus    
Stated value    
Equity at beginning of period 33,716 35,357
Shares issued on exercise of stock options   (680)
Stock-based compensation 20,411 17,041
Shares released on vesting of equity incentive plan (14,247) (12,867)
Shares issued on vesting of RSUs (4,599) (5,135)
Shares acquired and canceled under normal course issuer bid 0  
Shares issued under dividend reinvestment program   0
Equity at end of period $ 35,281 $ 33,716