Stockholders' Equity (Parenthetical) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Common Stock, Par Value	$ 0.01	$ 0.01
$25 Par Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Par Value	$ 25	$ 25	$ 25
Preferred Stock, Dividend Rate	4.00%	4.00%
$1 Par Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Par Value	$ 1	$ 1