SHARE-BASED COMPENSATION 1 (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 number	Dec. 31, 2010	Dec. 31, 2009
Number of Restricted Stock Units [Roll Forward]
RSUs beginning	2,329,174
RSUs awarded	445,213
RSUs released	(885,878)
RSUs forfeited	(27,932)
RSUs ending	1,860,577	2,329,174
Weighted Average Purchase Price RSUs	$ 0
Weighted Average Remaining Contractual Term (Years) RSUs	1.5
Aggregate Intrinsic Value RSUs	$ 11,442,549
Number of RSUs vested and expected to vest	1,705,617
Weighted Average Purchase Price of RSUs vested and expected to vest	$ 0
Weighted Average Remaining Contractual Term (Years) of RUSs vested and expected to vest	1.4
Aggregate Intrinsic Value RSUs vested and expected to vest	9,954,522
Number of RSUs exercisable	86,996
Weighted Average Purchase Price of RUSs exercisable	$ 0
Weighted Average Remaining Contractual Term (Years) of RUSs exercisable	0.0
Aggregate Intrinsic Value RSUs exercisable	535,025
Weighted average remaining recognition period in years	2.1
Unamortized compensation expense, net of estimated forfeitures	8,646,401
Other Options Disclosure [Abstract]
Cash received from exercise price of options exercised	$ 71,000	$ 130,000	$ 0