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STOCK BASED COMPENSATION (Summary of Status of Options) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock options vesting percentage, after one year 25.00%      
Stock options vesting percentage, following first anniversary 6.25%      
Options, Outstanding [Roll Forward]        
Options outstanding at beginning of period, Options 8,826,199 10,763,097 11,451,740  
Granted, Options 800,500 296,000 1,702,000  
Exercised, Options (772,986) (2,081,332) (2,233,789)  
Forfeited, Options (73,313) (151,566) (156,854)  
Options outstanding at end of period, Options 8,780,400 8,826,199 10,763,097  
Exercisable at end of period, Options 7,240,729 6,994,787 7,497,721  
Weighted Average Exercise Price [Roll Forward]        
Options outstanding at beginning of period, Weighted Average Exercise Price $ 4.19 $ 3.57 $ 2.82 $ 4.19
Granted, Weighted Average Exercise Price $ 8.81 $ 14.43 $ 6.53  
Exercised, Weighted Average Exercise Price $ 3.20 $ 2.19 $ 1.93  
Forfeited, Weighted Average Exercise Price $ 7.40 $ 7.36 $ 4.92  
Options outstanding at end of period, Weighted Average Exercise Price $ 4.67 $ 4.19 $ 3.57 $ 4.19
Exercisable at end of period, Weighted Average Exercise Price $ 3.90 $ 3.51 $ 2.71  
Aggregate Instrinsic Value [Abstract]        
Options outstanding at beginning of period, Aggregate Intrinsic Value $ 38,284,701 $ 116,085,316 $ 43,308,314  
Granted, Aggregate Intrinsic Value 0 0 0  
Exercised, Aggregate Intrinsic Value 4,893,058 25,011,227 18,216,548  
Forfeited, Aggregate Intrinsic Value 0 0 0  
Options outstanding at end of period, Aggregate Intrinsic Value 41,236,574 38,284,701 116,085,316  
Exercisable at end of period, Aggregate Intrinsic Value $ 38,974,435 $ 33,538,128 $ 87,248,090  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 1,393,863      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 8.36