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Net gains/(losses) on foreign currency transactions	12 Months Ended
	Dec. 31, 2017
Net gains/(losses) on foreign currency transactions [Abstract]
Net gains/(losses) on foreign currency transactions	10. Net gains/(losses) on foreign currency transactions Net gains and losses on foreign currency transactions primarily consists of gains or losses from currency trading and translation of monetary items from a foreign currency into the functional currency.

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Net gains/(losses) on foreign currency transactions [Abstract].

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Net gains/(losses) on foreign currency transactions.

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