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ACCRUED EXPENSES AND OTHER LIABILITIES (Schedule of Accrued Expenses and Other Liabilities) (Parenthetical) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Line of Credit Facility [Line Items]        
Gain on changes in fair value of derivatives ¥ 713 $ 103 ¥ 33,731 ¥ 2,605