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FAIR VALUE MEASUREMENTS (Assets and Liabilities on a Recurring Basis) (Details) - CNY (¥)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets:        
Derivative assets ¥ 7,277,406    
Liabilities:        
Convertible senior notes     ¥ 818,857,265  
Capped Call Option [Member]        
Assets:        
Derivative assets   17,490,323 21,098,263  
Call spread options [Member]        
Assets:        
Derivative assets 7,277,406
Fair Value, Measurements, Recurring [Member]        
Assets:        
Available-for-sale investment     20,875,725  
Liabilities:        
Warrant Liability 226,086,556 68,377,608    
Convertible senior notes 423,739,708 1,506,981,361 1,540,398,645  
Rate Cap Derivative 10,364,075      
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward Contract [Member]        
Assets:        
Derivative assets 640,876 7,038,537 47,712,744  
Liabilities:        
Warrant Liability   4,295,737 30,901,012  
Fair Value, Measurements, Recurring [Member] | Capped Call Option [Member]        
Assets:        
Derivative assets   17,490,323 21,098,263  
Fair Value, Measurements, Recurring [Member] | Call spread options [Member]        
Assets:        
Derivative assets   7,277,406    
Fair Value, Measurements, Recurring [Member] | Guarantee receivables [Member]        
Assets:        
Derivative assets 235,728,241      
Fair Value, Measurements, Recurring [Member] | Quote Prices in Active market for Identical Assets (Level 1) [Member]        
Assets:        
Available-for-sale investment      
Liabilities:        
Warrant Liability 0 0    
Convertible senior notes 0 0  
Rate Cap Derivative 0      
Fair Value, Measurements, Recurring [Member] | Quote Prices in Active market for Identical Assets (Level 1) [Member] | Foreign Exchange Forward Contract [Member]        
Assets:        
Derivative assets 0 0  
Liabilities:        
Warrant Liability   0  
Fair Value, Measurements, Recurring [Member] | Quote Prices in Active market for Identical Assets (Level 1) [Member] | Capped Call Option [Member]        
Assets:        
Derivative assets   0  
Fair Value, Measurements, Recurring [Member] | Quote Prices in Active market for Identical Assets (Level 1) [Member] | Call spread options [Member]        
Assets:        
Derivative assets   0    
Fair Value, Measurements, Recurring [Member] | Quote Prices in Active market for Identical Assets (Level 1) [Member] | Guarantee receivables [Member]        
Assets:        
Derivative assets 0      
Fair Value, Measurements, Recurring [Member] | Significance Other Observable Inputs (Level 2) [Member]        
Assets:        
Available-for-sale investment      
Liabilities:        
Warrant Liability 0 0    
Convertible senior notes 0 0  
Rate Cap Derivative 0      
Fair Value, Measurements, Recurring [Member] | Significance Other Observable Inputs (Level 2) [Member] | Foreign Exchange Forward Contract [Member]        
Assets:        
Derivative assets 640,876 7,038,537 47,712,744  
Liabilities:        
Warrant Liability   4,295,737 30,901,012  
Fair Value, Measurements, Recurring [Member] | Significance Other Observable Inputs (Level 2) [Member] | Capped Call Option [Member]        
Assets:        
Derivative assets   0  
Fair Value, Measurements, Recurring [Member] | Significance Other Observable Inputs (Level 2) [Member] | Call spread options [Member]        
Assets:        
Derivative assets   0    
Fair Value, Measurements, Recurring [Member] | Significance Other Observable Inputs (Level 2) [Member] | Guarantee receivables [Member]        
Assets:        
Derivative assets 0      
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Assets:        
Available-for-sale investment     20,875,725  
Liabilities:        
Warrant Liability 226,086,556 68,377,608    
Convertible senior notes 423,739,708 1,506,981,361 1,540,398,645  
Rate Cap Derivative 10,364,075      
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Forward Contract [Member]        
Assets:        
Derivative assets 0  
Liabilities:        
Warrant Liability    
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Capped Call Option [Member]        
Assets:        
Derivative assets   ¥ 21,098,263  
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Call spread options [Member]        
Assets:        
Derivative assets   ¥ 7,277,406    
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Guarantee receivables [Member]        
Assets:        
Derivative assets ¥ 235,728,241