Convertible Preferred Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Oct. 17, 2013	Dec. 31, 2012
Features of Convertible Preferred Stock [Abstract]
Convertible preferred stock, interest rate, stated percentage	5.25%
Liquidation preference per share	$ 1,000
Conversion of Preferred Stock to Common Stock, Date	Oct. 17, 2013
Shares outstanding (actual number)	0	0	0
Conversion rate per share		77.8966
Stock Issued During Period, Shares, Conversion of Convertible Securities	17,300,000
Dividends, Preferred Stock	$ 11.6
Preferred Stock, Dividend Rate, Per-Dollar-Amount	$ 52.50