Subsequent Events (Tables)

3 Months Ended

Mar. 31, 2012

Subsequent Events [Abstract]

Schedule Of Dividends Declared And Distributions Per Unit

Share Class	Series D Preferred Stock		Series E Preferred Stock		Series F Preferred Stock			Common stock and common unit
Dividend and distribution amount	$	0.343750	$	0.437500	$	0.395660	(1)	$	0.730000
Dividend and distribution payable date		June 29, 2012		June 29, 2012		June 29, 2012			June 29, 2012
Dividend payable to shareholders of record on		June 15, 2012		June 15, 2012		June 15, 2012			June 15, 2012
Annual equivalent rate of dividend and distribution	$	1.375	$	1.750	$	1.65625		$	2.920

(1) Represents a pro rata dividend from and including the original issue date to and including June 30, 2012.