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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, 2018	Dec. 31, 2017		Dec. 31, 2016
Earnings per share [abstract]
(Loss) / Profit from operations attributable to equity holders of the Group	$ (24,622)	$ 13,198		$ 11,568
Weighted average number of shares in issue (in shares)	116,637	120,599		121,421
Basic earnings / (loss) per share (in dollars per share)	$ (0.211)	$ 0.109	[1]	$ 0.095	[1]
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

+ References

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- Definition

The profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)]

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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