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Earnings per share - Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings per share [abstract]      
Profit from operations attributable to equity holders of the Group $ 108,138 $ 130,669 $ 412
Weighted average number of shares in issue (shares) 110,079 115,148 117,453
Adjustments for:      
Employee share options and restricted units (shares) 361 466 261
Weighted average number of shares for diluted earnings per share (shares) 110,440 115,614 117,714
Diluted (loss) / earnings per share from operations (USD per share) $ 0.979 $ 1.130 $ 0.003