Shareholders' Equity (Preferred Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended				0 Months Ended		1 Months Ended
	Jul. 19, 2012	May 04, 2013	Feb. 02, 2013	Apr. 28, 2012	Jul. 24, 2012 Series A 8% Percent Convertible Preferred Stock [Member]	Oct. 14, 2010 Series A 8% Percent Convertible Preferred Stock [Member]	Jul. 24, 2012 Series A 8% Percent Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, shares issued (shares)		0	0	89,291,773		89,291,773
Preferred stock dividend, percentage	8.00%				8.00%
Proceeds from issuance of convertible preferred stock						$ 191.9
Stock issuance costs						$ 2.1
Dividends payable (dollars per share)					$ 2.17		$ 2.17
Preferred Stock converted into common stock (shares)							30,894,953