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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

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