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Treasury Stock	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Treasury Stock	18. TREASURY STOCK For the year ended December 31, 2015, 2016 and 2017, the Company repurchased the number of nil, 815,525 and 3,448,482 ADSs pursuant to the share repurchase plans. For the year ended December 31, 2015, 2016 and 2017, 146,372, 223,161 and nil ADSs were issued to settle the contingent consideration payment in relation to acquisitions.

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- References

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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