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Earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings per share      
Profit for the year $ 92,040 $ 62,697 $ 63,593
Basic earnings per share (in dollars per share) $ 2.54 $ 1.62 $ 1.60
Diluted earnings per share (in dollars per share) $ 2.54 $ 1.62 $ 1.60
Weighted average of common shares outstanding applicable to basic EPS (in shares) 36,304 38,796 39,656
Effect of diluted securities:      
Adjusted weighted average of common shares outstanding applicable to diluted EPS (in shares) 36,304 38,796 39,656