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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings per share [abstract]      
(Loss) / Profit from operations attributable to equity holders of the Group $ (772) $ (24,622) $ 13,198
Weighted average number of shares in issue (shares) 117,252 116,637 120,599
Adjustments for:      
Employee share options and restricted units (shares) 645 1,198 1,604
Weighted average number of shares for diluted earnings per share (shares) 117,897 117,835 122,203
Diluted (loss) / earnings per share from operations (USD per share) $ (0.007) $ (0.211) $ 0.108