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Earnings per share - Basic Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings per share [abstract]      
Profit / (loss) from operations attributable to equity holders of the Group $ 412 $ (772) $ (24,622)
Weighted average number of shares in issue (shares) 117,453 117,252 116,637
Basic earnings / (loss) per share from operations (USD per share) $ 0.003 $ (0.007) [1] $ (0.211) [1]
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within financial results as explained in Note 34.1.