Subsequent Events (Tables)

6 Months Ended

Jun. 30, 2012

Subsequent Events [Abstract]

Schedule of Dividends Declared

Class	Quarterly Amount per Share or Unit	Record Date	Payment Date
Common	$0.17	August 15, 2012	August 31, 2012
Preferred (per depositary share or unit):
Series J	$0.414063	August 15, 2012	August 31, 2012
Series K	$0.406250	August 15, 2012	August 31, 2012
Series L	$0.412500	August 15, 2012	August 31, 2012
Series O	$0.523437	September 17, 2012	October 1, 2012