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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
CNY (¥)
ACCOUNTS RECEIVABLE [Abstract]          
Accounts receivable $ 33,968   ¥ 267,291   ¥ 220,035
Allowance for doubtful accounts (275)   (2,281)   (1,781)
Accounts receivable, net 33,693   265,010   ¥ 218,254
The movement in the allowance for doubtful accounts were as follows:          
Balance at the beginning of the year 352 ¥ 2,281 ¥ 3,091 ¥ 3,091  
Acquisition of CHS 26 167  
Provisions for the year 452 2,925 ¥ 700  
Reversal of provisions from prior periods due to subsequent cash collection during the year (116) (749) ¥ (1,510)  
Amounts written off during the year (439) (2,843)  
Balance at the end of the year $ 275 ¥ 1,781 ¥ 2,281 ¥ 3,091