Subsequent Events (Schedule Of Dividends Declared And Distributions Per Unit) (Details) (USD $)	12 Months Ended					0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Dec. 31, 2013 Series E Cumulative Convertible Preferred Units [Member]	Dec. 31, 2012 Series E Cumulative Convertible Preferred Units [Member]	Dec. 31, 2011 Series E Cumulative Convertible Preferred Units [Member]	Dec. 31, 2013 Series F Cumulative Convertible Preferred Units [Member]	Dec. 31, 2012 Series F Cumulative Convertible Preferred Units [Member]	Jun. 28, 2013 Series G Cumulative Convertible Preferred Units [Member]	Dec. 31, 2013 Series G Cumulative Convertible Preferred Units [Member]	Feb. 11, 2014 Subsequent Event [Member] Series E Cumulative Convertible Preferred Units [Member]	Dec. 31, 2013 Subsequent Event [Member] Series E Cumulative Convertible Preferred Units [Member]	Feb. 11, 2014 Subsequent Event [Member] Series F Cumulative Convertible Preferred Units [Member]	Dec. 31, 2013 Subsequent Event [Member] Series F Cumulative Convertible Preferred Units [Member]	Feb. 11, 2014 Subsequent Event [Member] Series G Cumulative Convertible Preferred Units [Member]	Dec. 31, 2013 Subsequent Event [Member] Series G Cumulative Convertible Preferred Units [Member]	Feb. 11, 2014 Subsequent Event [Member] Common Stock [Member]	Dec. 31, 2013 Subsequent Event [Member] Common Stock [Member]
Subsequent Event [Line Items]
Dividend and distribution amount								$ 0.437500		$ 0.414063		$ 0.367188		$ 0.830000
Dividend and distribution payable date									Mar. 31, 2014		Mar. 31, 2014		Mar. 31, 2014		Mar. 31, 2014
Dividend and distribution payable to holders of record on									Mar. 14, 2014		Mar. 14, 2014		Mar. 14, 2014		Mar. 14, 2014
Annual equivalent rate of dividend and distribution	$ 1.750	$ 1.750	$ 1.750	$ 1.656	$ 1.656	$ 0.334550	$ 1.46875	$ 1.750		$ 1.656		$ 1.46900		$ 3.320