Equity and Accumulated Other Comprehensive Income, Net (Schedule Of Dividends/Distributions) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares
February 17, 2016
Dividends Payable [Line Items]
Date dividend/distribution declared	Feb. 17, 2016
Dividend/Distribution payment date	Mar. 31, 2016
Series E Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount | $ / shares	$ 1.750
Series E Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock | $	$ 5,031
Series F Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount | $ / shares	$ 1.656
Series F Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock | $	$ 3,023
Series G Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount | $ / shares	$ 1.469
Series G Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock | $	$ 3,672
Series H Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount | $ / shares	$ 1.844
Series H Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock | $	$ 6,730
Series I Preferred Stock
Dividends Payable [Line Items]
Preferred stock dividend per share amount | $ / shares	$ 1.588
Series I Preferred Stock | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock | $	$ 3,969
Common Stock
Dividends Payable [Line Items]
Common stock dividend per share amount | $ / shares	$ 3.520
Common Stock | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, common units | $	$ 129,064