Share Based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unvested stock options
Options outstanding, Beginning Balance, Shares	28,932,000
Granted, Outstanding	931,000	32,115	10,015,883
Granted, Weighted-Average Grant-Date Fair Value	$ 6.24	$ 6.62	$ 0.0285
Forfeited, Shares	(459,000)
Options outstanding, Ending Balance, Shares	27,870,000	28,932,000
Unvested Stock Options [Member]
Unvested stock options
Options outstanding, Beginning Balance, Shares	3,941,000
Unvested Options, Weighted-Average Grant-Date Fair Value, Beginning Balance	$ 3.88	$ 2.81
Granted, Outstanding	931,000
Granted, Weighted-Average Grant-Date Fair Value	$ 6.24
Vested, Outstanding	(1,800,000)
Vested, Weighted-Average Grant-Date Fair Value	$ 2.87
Forfeited, Shares	(172,000)
Forfeited, Weighted-Average Grant-Date Fair Value	$ 2.73
Options outstanding, Ending Balance, Shares	2,900,000	3,941,000
Unvested Options, Weighted-Average Grant-Date Fair Value, Ending Balance	$ 3.88	$ 2.81