Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 26, 2011
Condensed Consolidated Balance Sheets [Abstract]
Redeemable preferred stock, liquidation preference	$ 387,172	$ 377,729	$ 368,516
Common stock, authorized shares	800,000,000	800,000,000	800,000,000
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, issued shares	289,739,448	286,430,567	283,486,355
Common stock, outstanding shares	289,739,448	286,430,567	283,486,355
Treasury stock, shares	5,915,268	5,915,268	5,915,268