Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Common Stock [Member]
Dividends per Depositary Share (in Dollars per share)	$ 0.42	$ 0.38
Series F Preferred Stock [Member]
Dividends per Depositary Share (in Dollars per share)		$ 0.8312
Series G Preferred Stock [Member]
Dividends per Depositary Share (in Dollars per share)		$ 0.9688
Series H Preferred Stock [Member]
Dividends per Depositary Share (in Dollars per share)	$ 0.8625	$ 0.8625
Series I Preferred Stock [Member]
Dividends per Depositary Share (in Dollars per share)	$ 0.7500	$ 0.4208
Series J Preferred Stock [Member]
Dividends per Depositary Share (in Dollars per share)	$ 0.6875
Series K Preferred Stock [Member]
Dividends per Depositary Share (in Dollars per share)	$ 0.7032