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SHORT TERM INVESTMENTS (Schedule of Interest Income Recognized on Held-To-Maturity Investments) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
Interest income recognized on held-to-maturity investments | ¥ 5,836 | $ 849 | ¥ 3,799 | ¥ 4,078

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- Definition Amount of operating interest income, including amortization and accretion of premiums and discounts, on held-to-maturity securities. + References No definition available. + Details
Name: | us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration