Equity And Accumulated Other Comprehensive Loss, Net (Schedule Of Dividends) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Date dividend/distribution declared	Feb. 12, 2013
Dividend/Distribution payable date	Mar. 29, 2013
Series E Cumulative Convertible Preferred Units [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Dividends/Distributions, preferred stock/units	5,031	[1]
Preferred stock dividend per share amount	1.750
Series F Cumulative Convertible Preferred Units [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Dividends/Distributions, preferred stock/units	3,023	[2]
Preferred stock dividend per share amount	1.656
Common Stock [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Dividends/Distributions, common stock/units	100,165	[3]
Common stock dividend per share amount	3.120

[1] $1.750 annual rate of dividend per share.

[2] $1.656 annual rate of dividend per share.

[3] $3.120 annual rate of dividend per share.