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SHARE-BASED AWARDS (Schedule of Share-Based Compensation Expense) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation ¥ 11,641 $ 1,789 ¥ 8,400 ¥ 8,084
General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation 10,099 1,552 7,573 7,304
Selling Expenses [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation ¥ 1,542 $ 237 ¥ 827 ¥ 780