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STOCK BASED COMPENSATION (Summary of Status of Options) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 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 8,780,400 8,826,199 10,763,097
Granted, Options 1,087,000 800,500 296,000
Exercised, Options (1,688,079) (772,986) (2,081,332)
Forfeited, Options (642,720) (73,313) (151,566)
Options outstanding at end of period, Options 7,536,601 8,780,400 8,826,199
Exercisable at end of period, Options 6,275,243 7,240,729 6,994,787
Weighted Average Exercise Price [Roll Forward]      
Options outstanding at beginning of period, Weighted Average Exercise Price $ 4.67 $ 4.19 $ 3.57
Granted, Weighted Average Exercise Price $ 9.59 $ 8.81 $ 14.43
Exercised, Weighted Average Exercise Price $ 1.99 $ 3.20 $ 2.19
Forfeited, Weighted Average Exercise Price $ 9.90 $ 7.40 $ 7.36
Options outstanding at end of period, Weighted Average Exercise Price $ 5.53 $ 4.67 $ 4.19
Exercisable at end of period, Weighted Average Exercise Price $ 4.77 $ 3.90 $ 3.51
Aggregate Instrinsic Value [Abstract]      
Options outstanding at beginning of period, Aggregate Intrinsic Value $ 41,236,574 $ 38,284,701 $ 116,085,316
Granted, Aggregate Intrinsic Value 0 0 0
Exercised, Aggregate Intrinsic Value 12,042,458 4,893,058 25,011,227
Forfeited, Aggregate Intrinsic Value 0 0 0
Options outstanding at end of period, Aggregate Intrinsic Value 17,493,907 41,236,574 38,284,701
Exercisable at end of period, Aggregate Intrinsic Value $ 17,413,337 $ 38,974,435 $ 33,538,128
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 1,139,090    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 9.36