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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Additional Information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Aug. 12, 2019
USD ($)
Apr. 16, 2019
USD ($)
Apr. 15, 2019
USD ($)
Apr. 15, 2019
CNY (¥)
Sep. 29, 2017
USD ($)
Aug. 17, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2017
CNY (¥)
Aug. 17, 2017
USD ($)
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION                    
Proceeds from issuance of Notes, net             $ 289,018 ¥ 2,012,084 ¥ 1,936,154  
Loss on debt extinguishment             2,714 18,895    
Bonds 7% Due 2020                    
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION                    
Debt instrument, face amount         $ 100,000         $ 200,000
Debt instrument, stated rate         7.00%         7.00%
Debt instrument, premium price         100.04          
Debt instrument, effective yield         6.98%          
Proceeds from issuance of Notes, net | ¥           ¥ 1,926,419        
Principal amount repurchased $ 18,000 $ 150,839                
Total aggregate principal amount repurchased (as a percent)   50.28%                
Outstanding principal amount 131,161                  
Bonds 7.875%, Due 2021                    
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION                    
Debt instrument, face amount     $ 300,000              
Debt instrument, stated rate     7.875%              
Proceeds from issuance of Notes, net     $ 283,903 ¥ 1,976,474            
Parent Company                    
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION                    
Loss on debt extinguishment             2,714 18,895    
Parent Company | Bonds 7% Due 2020                    
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION                    
Debt instrument, face amount         $ 100,000         $ 200,000
Debt instrument, stated rate         7.00%         7.00%
Debt instrument, maturity date         Aug. 17, 2020          
Debt instrument, frequency of periodic payment         Notes is payable semi-annually in arrears on August 17 and February 17 in each year          
Debt instrument, date of first required payment         Feb. 17, 2018          
Debt instrument, premium price         100.04          
Debt instrument, effective yield         6.98%          
Proceeds from issuance of Notes, net | ¥               1,926,419    
Principal amount repurchased $ 18,000 $ 150,839                
Total aggregate principal amount repurchased (as a percent)   50.28%                
Outstanding principal amount             131,161      
Parent Company | Bonds 7.875%, Due 2021                    
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION                    
Debt instrument, face amount     $ 300,000              
Debt instrument, stated rate     7.875%              
Debt instrument, frequency of periodic payment     Notes is payable semi-annually in arrears on April 15 and October 15 in each year Notes is payable semi-annually in arrears on April 15 and October 15 in each year            
Debt instrument, date of first required payment     Oct. 15, 2019 Oct. 15, 2019            
Proceeds from issuance of Notes, net             $ 283,903 ¥ 1,976,474