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SHORT TERM INVESTMENTS (Schedule of Amortized Cost, Gross Unrecognized Holding Gains and Losses, Gross Unrealized Gain in Accumulated Other Comprehensive Income, and Estimated Fair Value of Investments) (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fixed-Rate Financial Products [Member] |  |
Held-to-maturity investments |  |
Amortized Cost | ¥ 70,000 | ¥ 93,000
Gross unrealized gain in accumulated other comprehensive income | 0 | 0
Estimated Fair value | 70,000 | 93,000
Adjustable-Rate Financial Products [Member] |  |
Available-for-sale investments |  |
Amortized Cost | 47,000 | 128,000
Gross unrealized gain in accumulated other comprehensive income | 208 | 42
Estimated Fair value | ¥ 47,208 | ¥ 128,042

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