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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings per share [abstract]      
Profit (loss), attributable to ordinary equity holders of parent entity $ (24,622) $ 13,198 $ 11,568
Weighted average number of shares in issue (in shares) 116,637 120,599 121,421
Adjustments for:      
Employee share options and restricted units (in shares) 1,198 1,604 1,695
Weighted average number of shares for diluted earnings per share (in shares) 117,835 122,203 123,116
Diluted earnings / (loss) per share from operations (in dollars per share) $ (0.211) $ 0.108 [1] $ 0.094 [1]
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.