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FAIR VALUE MEASUREMENTS (Narrative) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]          
Impairment charge, long-lived assets held and used ¥ 23,659 $ 3,441 ¥ 60,162    
Assets Held-for used, Long Lived, Fair Value Disclosure 7,885     $ 1,147  
Fair Value, Measurements, Nonrecurring [Member]          
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]          
Fair value, long-lived assets held and used 117   ¥ 632 17 $ 97
Impairment charge, long-lived assets held and used 7,768 $ 1,130      
Fair Value, Measurements, Nonrecurring [Member] | Measurement Input, Discount Rate [Member]          
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]          
Fair value, long-lived assets held and used ¥ 117     $ 17  
Level 3 [Member] | Measurement Input, Discount Rate [Member]          
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]          
Long Lived Assets Measurement Input 14     14  
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]          
Fair value, long-lived assets held and used       $ 117 $ 632