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SHARE-BASED COMPENSATION - Restricted share activity (Details) - CNY (¥) ¥ / shares in Units, ¥ in Thousands	1 Months Ended	4 Months Ended	9 Months Ended
	Jul. 31, 2017	Aug. 31, 2017	Sep. 30, 2017
SHARE-BASED COMPENSATION
Settlement of liability-classified restricted shares award			¥ 2,913
Directors
SHARE-BASED COMPENSATION
Settlement of liability-classified restricted shares award (in shares)		396,800
Settlement of liability-classified restricted shares award		¥ 2,913
Restricted shares
Number of Shares
Unvested at January 1, 2017 (in shares)			12,910,080
Granted (in shares)			13,871,860
Vested (in shares)			(2,017,920)
Forfeited (in shares)			(186,800)
Unvested at September 30, 2017 (in shares)			24,577,220
Weighted average grant-date fair value per share
Unvested at January 1, 2017 (in RMB per share)			¥ 6.0
Granted (in RMB per share)			5.2
Vested (in RMB per share)			8.1
Forfeited (in RMB per share)			7.2
Unvested at September 30, 2017 (in RMB per share)			¥ 5.4
Restricted shares | Employees, officers and directors
Number of Shares
Granted (in shares)	13,475,060

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Liability settled during the current period with restricted shares awarded.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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