Miscellaneous Financial Information (Unaudited), Dividends and Preferred Stock Redemption (Details) (Common Stock [Member], USD $)	1 Months Ended
	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Jan. 30, 2014 Subsequent Event [Member]
Dividends Payable [Line Items]
Dividend payable (in dollars per share)									$ 0.3625
Common Stock, Dividends, Per Share, Declared	$ 0.3625	$ 0.3625	$ 0.3625	$ 0.3375	$ 0.3375	$ 0.3375	$ 0.3125	$ 0.3125