STOCK BASED COMPENSATION (Summary of Status of Options) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Options, Outstanding [Roll Forward]
Options outstanding at beginning of period, Options	9,057,217	9,817,060	8,826,199	10,763,097
Granted, Options	40,000	0	523,000	291,000
Exercised, Options	(293,829)	(511,729)	(528,811)	(1,704,828)
Forfeited, Options	(63,688)	(33,564)	(80,688)	(77,502)
Options outstanding at end of period, Options	8,739,700	9,271,767	8,739,700	9,271,767
Exercisable at end of period, Options	7,057,791	6,746,017	7,057,791	6,746,017
Weighted Average Exercise Price [Roll Forward]
Options outstanding at beginning of period, Weighted Average Exercise Price	$ 4.48	$ 4.03	$ 4.19	$ 3.57
Granted, Weighted Average Exercise Price	$ 9.46	$ 0.00	$ 9.01	$ 14.50
Exercised, Weighted Average Exercise Price	$ 1.68	$ 2.55	$ 2.13	$ 2.41
Forfeited, Weighted Average Exercise Price	$ 6.84	$ 7.02	$ 6.48	$ 6.16
Options outstanding at end of period, Weighted Average Exercise Price	$ 4.58	$ 4.10	$ 4.58	$ 4.10
Exercisable at end of period, Weighted Average Exercise Price	$ 3.87	$ 3.20	$ 3.87	$ 3.20
Aggregate Instrinsic Value [Abstract]
Options outstanding at beginning of period, Aggregate Intrinsic Value	$ 45,552,154	$ 114,201,250	$ 38,284,701	$ 116,085,316
Granted, Aggregate Intrinsic Value	0	0	0	0
Exercised, Aggregate Intrinsic Value	2,523,760	6,892,626	4,146,200	21,035,771
Forfeited, Aggregate Intrinsic Value	0	0	0	0
Options outstanding at end of period, Aggregate Intrinsic Value	43,605,127	87,646,935	43,605,127	87,646,935
Exercisable at end of period, Aggregate Intrinsic Value	$ 39,514,154	$ 69,637,173	$ 39,514,154	$ 69,637,173