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FAIR VALUE MEASUREMENTS (Schedule of Fair Value Measurements for Each Class of Assets on Nonrecurring Basis) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
FAIR VALUE MEASUREMENTS [Line Items]            
Available-for-sale debt investments         $ 50,000  
Total loss ¥ 0 $ 0 ¥ 0 ¥ 713    
Recurring [Member]            
FAIR VALUE MEASUREMENTS [Line Items]            
Available-for-sale debt investments 50,000       7,272  
Total loss | ¥ 0          
Nonrecurring [Member]            
FAIR VALUE MEASUREMENTS [Line Items]            
Long-lived assets held and used 117   632   17 $ 97
Total loss | ¥ ¥ (7,768)   ¥ (1,507)      
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]            
FAIR VALUE MEASUREMENTS [Line Items]            
Long-lived assets held and used         0 0
Nonrecurring [Member] | Significance Other Observable Inputs (Level 2) [Member]            
FAIR VALUE MEASUREMENTS [Line Items]            
Long-lived assets held and used         0 0
Nonrecurring [Member] | Significant unobservable inputs (Level 3) [Member]            
FAIR VALUE MEASUREMENTS [Line Items]            
Long-lived assets held and used         $ 117 $ 632