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CONVERTIBLE NOTES (Details) (USD $)
 0 Months Ended 12 Months Ended
Dec. 18, 2012
Jun. 27, 2008
Dec. 11, 2007
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONVERTIBLE NOTES            
Initial fair value of debt component       $ 214,562,963    
Amortization expense of discount on debt       49,699 44,485 39,816
Details of convertible notes            
Net carrying amount of the debt component         950,301  
2007 Notes
            
CONVERTIBLE NOTES            
Amount of debt to be issued under the subscription agreement     75,000,000      
Fixed rate (as a percent)     6.00%      
Initial conversion rate (in shares per USD)     0.0506073      
Initial conversion price (in dollars per share)     $ 19.76      
Repurchase price as a percentage of principal amount of notes       100.00%    
Redemption price as a percentage of principal amount of notes       100.00%    
Percentage of the conversion price that the closing price of the entity's common stock must exceed in order for the notes to be convertible       130.00%    
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable       20 days    
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable       30 days    
Number of consecutive trading days before 30 consecutive trading days during the note measurement period       5 days    
Percentage of initial aggregate principal amount of the notes that must be redeemed, converted or repurchased and, in each case, cancelled in order for the notes to be redeemed       95.00%    
Initial fair value of debt component       62,686,088    
Offering costs incurred for the issuance of the Notes       3,351,634    
Initial debt issuance costs       2,801,344    
Effective interest rate (as a percent)       11.40% 11.40% 11.40%
Amortization expense of discount on debt       49,699 44,485 39,816
Coupon interest recorded       60,000 60,000 60,000
Initial conversion rate (in shares per USD)   0.0536061        
Number of common stock shares issued upon conversion of the Notes   3,966,841        
Principal amount of debt instrument converted   74,000,000        
Amount of charge to earnings upon induced conversion of the Notes   10,170,118        
Gain (loss) on debt extinguishment   2,429,524   0    
Unamortized debt discount and debt issuance costs reclassified to common shares   13,766,173        
Aggregate principal amount of debt redeemed 1,000,000          
Details of convertible notes            
Carrying amount of the equity component         156,848  
Principal amount of the debt component         1,000,000  
Unamortized debt discount         49,699  
Net carrying amount of the debt component       $ 0 $ 950,301