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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                
Noon buying rate 6.8755           6.8755  
Interest and other costs relating to construction capitalized ¥ 55,485 $ 8,070   $ 38,533   $ 1,956    
Impairment on long-lived assets 5,433 790 ¥ 28,600   ¥ 61,124      
Taxes and related surcharges     2,439   5,854      
Advertising expenses 2,429 $ 353 2,910   7,378      
Deferred Tax Liabilities, Loss Transfer ¥ 0   5,632       $ 0 $ 819
Description of Items to be Classified as Cash Equivalents 90 days 90 days            
Interest Costs Incurred ¥ 101,717 $ 14,793 ¥ 128,492   ¥ 91,283      
Minimum [Member]                
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                
Leases and management service arrangements, term 5 years 5 years            
Maximum [Member]                
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                
Leases and management service arrangements, term 20 years 20 years            
Prepaid Land Lease Rights [Member]                
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                
Leases and management service arrangements, term 50 years 50 years