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CONVERTIBLE SENIOR NOTES (Details)
0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
May 17, 2011
Capped Call Option [Member]
USD ($)
Dec. 31, 2012
Capped Call Option [Member]
CNY
Dec. 31, 2011
Capped Call Option [Member]
CNY
May 17, 2011
Convertible Senior Notes [Member]
USD ($)
Dec. 31, 2012
Convertible Senior Notes [Member]
CNY
Dec. 31, 2011
Convertible Senior Notes [Member]
CNY
Dec. 31, 2011
Convertible Senior Notes [Member]
USD ($)
Debt Instrument [Line Items]              
Aggregate principal amount       $ 125,000,000      
Debt issuance date       May 17, 2011      
Debt maturity date       May 15, 2016      
Stated interest rate       4.00%      
Convertible debt, conversion rate       29.6307      
Convertible debt, conversion price $ 48.21     $ 33.75      
Debt covenant, ownership interest threshold       50.00%      
Call feature, percentage       100.00%      
Fair value of convertible notes         483,581,668 387,777,235  
Foreign exchange gain         1,047,241 21,567,522  
Gain from change in fair value of convertible senior notes         96,851,674 398,030,217  
Face value of notes repurchased              2,000,000
Percent of notes repurchased            1.60%  
Percentage of price redeemed at            41.00%  
Premium paid for derivative 18,000,000            
Derivative, fair value   16,131,208 16,408,445        
Change in fair value of capped call option   309,052 98,282,510