Subsequent Events (Schedule Of Dividends Declared And Distributions Per Unit) (Details) (USD $)	0 Months Ended	9 Months Ended
	Apr. 09, 2013	Sep. 30, 2013
Series E Cumulative Convertible Preferred Units [Member]
Subsequent Event [Line Items]
Annual equivalent rate of dividend and distribution		$ 1.750
Series F Cumulative Convertible Preferred Units [Member]
Subsequent Event [Line Items]
Annual equivalent rate of dividend and distribution		$ 1.656
Series G Cumulative Convertible Preferred Units [Member] [Member]
Subsequent Event [Line Items]
Dividend and distribution amount	$ 0.334550
Annual equivalent rate of dividend and distribution	$ 1.46875	$ 1.469
Subsequent Event [Member] | Series E Cumulative Convertible Preferred Units [Member]
Subsequent Event [Line Items]
Dividend and distribution amount		$ 0.437500
Dividend and distribution payable date		Dec. 31, 2013
Dividend and distribution payable to holders of record on		Dec. 13, 2013
Annual equivalent rate of dividend and distribution		$ 1.750
Subsequent Event [Member] | Series F Cumulative Convertible Preferred Units [Member]
Subsequent Event [Line Items]
Dividend and distribution amount		$ 0.414063
Dividend and distribution payable date		Dec. 31, 2013
Dividend and distribution payable to holders of record on		Dec. 13, 2013
Annual equivalent rate of dividend and distribution		$ 1.656
Subsequent Event [Member] | Series G Cumulative Convertible Preferred Units [Member] [Member]
Subsequent Event [Line Items]
Dividend and distribution amount		$ 0.367188
Dividend and distribution payable date		Dec. 31, 2013
Dividend and distribution payable to holders of record on		Dec. 13, 2013
Annual equivalent rate of dividend and distribution		$ 1.46875
Subsequent Event [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Dividend and distribution amount		$ 0.780000
Dividend and distribution payable date		Jan. 15, 2014
Dividend and distribution payable to holders of record on		Dec. 13, 2013
Annual equivalent rate of dividend and distribution		$ 3.120