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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, 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
Basic (loss) / earnings per share from operations (USD per share)	$ (0.007)	$ (0.211)	$ 0.109

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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).

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- Definition

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

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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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