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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share [abstract]      
Profit (loss), attributable to ordinary equity holders of parent entity $ 9,972 $ 2,039 $ (5,593)
Weighted average number of shares in issue (in shares) 120,599 121,421 120,901
Adjustments for:      
Employee share options and restricted units (in shares) 1,604 1,695 1,445
Weighted average number of shares for diluted earnings per share (in shares) 122,203 123,116 122,346
Diluted earnings / (loss) per share from operations (in dollars per share) $ 0.082 $ 0.017 $ (0.046)