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EARNINGS PER SHARE (Schedule of Basic and Diluted Earnings Per Share) (Details) - CNY (¥) ¥ / shares in Units, ¥ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income attributable to Class A and Class B ordinary shareholders	¥ 241,854	¥ 178,760	¥ 148,320
Net income for basic and diluted earnings per share	¥ 241,854	¥ 178,760	¥ 128,361
Denominator:
Weighted average number of Class A and Class B ordinary shares outstanding	55,540,670	53,767,810	41,223,389
Dilutive effect of outstanding share options	3,464,591	4,983,046	6,546,743
Denominator for diluted earnings per share	59,005,261	58,750,856	47,770,132
Basic earnings per Class A and Class B ordinary share	¥ 4.35	¥ 3.32	¥ 3.11
Diluted earnings per Class A and Class B ordinary share	¥ 4.10	¥ 3.04	¥ 2.69
Series A [Member]
Numerator:
Earnings allocated to participating convertible redeemable preferred shares			¥ (5,648)
Series B [Member]
Numerator:
Earnings allocated to participating convertible redeemable preferred shares			(5,745)
Series C [Member]
Numerator:
Earnings allocated to participating convertible redeemable preferred shares			¥ (8,566)

X

- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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