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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings per share [abstract]      
Profit / (loss) from operations attributable to equity holders of the Group $ 130,669 $ 412 $ (772)
Weighted average number of shares in issue (shares) 115,148 117,453 117,252
Adjustments for:      
Employee share options and restricted units (shares) 466 261 645
Weighted average number of shares for diluted earnings per share (shares) 115,614 117,714 117,897
Diluted (loss) / earnings per share from operations (USD per share) $ 1.130 $ 0.003 $ (0.007)