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PARENT ONLY FINANCIAL INFORMATION (Condensed Statements of Cash Flows) (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating activities:      
Net cash provided by (used in) operating activities ¥ 524,030 ¥ 347,698 ¥ 175,343
Investing activities:      
Purchase of time deposits (421,170) (639,019) (708,124)
Proceeds from maturity of time deposits 678,741 690,250 22,325
Net cash provided by (used in) investing activities (156,449) (72,309) (734,539)
Financing activities:      
Issuance of Class A ordinary shares upon the IPO 592,161
Issuance of Class A ordinary shares in private placement concurrent with the IPO 83,052
Issuance of Class A ordinary shares in connection with exercise of share options 20,388 22,456 1,518
Payment of dividends (54,026)
Repurchase of treasury shares (44,406) (49,355)
Payment of IPO costs (21,705)
Net cash provided by (used in) financing activities (78,044) (26,899) 655,026
Effect of foreign currency exchange rate changes on cash and cash equivalents 7,197 4,413 5,837
Series A [Member]      
Non-cash investing and financing activities:      
Conversion of convertible redeemable preferred shares 3,648
Series B [Member]      
Non-cash investing and financing activities:      
Conversion of convertible redeemable preferred shares 107,994
Series C [Member]      
Non-cash investing and financing activities:      
Conversion of convertible redeemable preferred shares 592,849
Parent Company [Member]      
Operating activities:      
Net cash provided by (used in) operating activities (10,272) 9,770 19,036
Investing activities:      
Purchase of time deposits (298,688) (588,426) (569,312)
Proceeds from maturity of time deposits 620,607 603,501 3,071
Investments made to subsidiaries (198,137) (104,662)
Net cash provided by (used in) investing activities 123,782 15,075 (670,903)
Financing activities:      
Advances from a related party 1,432
Repayment of advances from a related party (1,432)
Issuance of Class A ordinary shares upon the IPO 592,161
Issuance of Class A ordinary shares in private placement concurrent with the IPO 83,052
Issuance of Class A ordinary shares in connection with exercise of share options 20,388 22,456 1,518
Payment of dividends (54,026)
Repurchase of treasury shares (44,406) (49,355)
Payment of IPO costs (17,228)
Net cash provided by (used in) financing activities (78,044) (26,899) 659,503
Effect of foreign currency exchange rate changes on cash and cash equivalents 2,029 398 (27)
Net increase (decrease) in cash and cash equivalents 37,495 (1,656) 7,609
Cash and cash equivalents at beginning of year 6,275 7,931 322
Cash and cash equivalents at end of year 43,770 6,275 7,931
Parent Company [Member] | Series A [Member]      
Non-cash investing and financing activities:      
Conversion of convertible redeemable preferred shares 3,648
Parent Company [Member] | Series B [Member]      
Non-cash investing and financing activities:      
Conversion of convertible redeemable preferred shares 107,994
Parent Company [Member] | Series C [Member]      
Non-cash investing and financing activities:      
Conversion of convertible redeemable preferred shares ¥ 592,849