Stockholders' Equity (Summary Of Authorized And Issued Shares) (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Stockholders' Equity [Abstract]
Preferred Stock, Par Value	$ 0.01	$ 0.01	$ 0.01
Preferred Stock, Shares authorized	5,000,000	5,000,000	5,000,000
Preferred Stock, Shares issued	0	0	0
Common Stock, Par Value	$ 0.01	$ 0.01	$ 0.01
Common Stock, Shares authorized	400,000,000	400,000,000	400,000,000
Common Stock, Shares issued	296,071,374	295,258,674	294,861,424