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Shareholders' equity - Basic and diluted earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Numerator (in thousands $):    
Net income - basic $ 41,799 $ 17,632
Net income - diluted $ 41,799 $ 17,632
Denominator (number of shares in thousands):    
Weighted average number of common shares 25,892 25,923
Weighted average number of unvested shares purchased by the Trust (662) (857)
Weighted average number of common shares - basic 25,230 25,066
Weighted average number of dilutive stock options 13 13
Weighted average number of unvested shares under EIP 827 1,107
Weighted average number of common shares - diluted 26,070 26,186
Net income per common share    
Basic net income per common share (in USD per share) $ 1.66 $ 0.70
Diluted net income per common share (in USD per share) $ 1.60 $ 0.67