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RESTRICTED CASH (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Restricted Cash and Cash Equivalents Items [Line Items]      
Current and non-current restricted cash ¥ 568,494 $ 81,880 ¥ 555,035