Equity (Details) (USD $)	3 Months Ended
	Mar. 31, 2012
Class of Warrant or Right [Line Items]
Exercise price of warrant	$ 9.676
Equity (Textual) [Abstract]
Common stock repurchased, shares	2,600,000
Common stock repurchased, value	$ 42,000,000
Repurchase of warrants	300,000,000
Authorization of stock repurchase program	500,000,000
Common stock, shares authorized	$ 106,000,000
Warrants for Series B and C after anti-dilution provision trigger [Member] | Note Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants to purchase shares	69,351,806
Exercise price of warrant	$ 25.23