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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable ¥ 189,646   ¥ 220,035   $ 27,314
Allowance for doubtful accounts (57)   (1,781)   (8)
Accounts receivable, net 189,589   218,254   $ 27,306
The movement in the allowance for doubtful accounts were as follows:          
Balance at the beginning of the year 1,781 $ 257 2,281 ¥ 3,091  
Acquisition of CHS 167  
Provisions for the year 1,066 154 2,925 700  
Reversal of provisions from prior periods due to subsequent cash collection during the year (749) (1,510)  
Amounts written off during the year (2,790) (403) (2,843)  
Balance at the end of the year ¥ 57 $ 8 ¥ 1,781 ¥ 2,281