Preferred Securities (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended
	Oct. 08, 2003	Jul. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Preferred Securities [Abstract]
Preferred Stock Depository Shares	9,200,000
Depository Shares Fraction Interest	1/10th
Auction Market Preferred Securities, Dividend Arrearages, Per Share	$ 25
Preferred Stock, Value, Issued	$ 230,000,000
Preferred stock, shares issued		460,000
Stock Repurchased And Retired During Period Per Share		$ 25
Stock Repurchased and Retired During Period, Value		115,000,000
Loss on extinguishment of preferred stock			$ 0	$ 3,295,000	$ 0