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INVESTMENTS (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
INVESTMENTS |  |  |
Interest income | ¥ 7,593 | ¥ 846 | ¥ 0
Held-to-maturity investments |  |  |
Gross unrecognized holding gains | 0 |  |
Gross unrecognized holding losses | 0 |  |
Available-for-sale investments |  |  |
Changes in fair value of the available-for-sale investments, net of tax | ¥ 0 | ¥ 0 |

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