Equity and Accumulated Other Comprehensive Income, Net (Schedule of Dividends/Distributions) (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares
February 17, 2016
Dividends Payable [Line Items]
Date dividend/distribution declared	Feb. 17, 2016
Dividend/Distribution payment date	Mar. 31, 2016
May 11, 2016
Dividends Payable [Line Items]
Date dividend/distribution declared	May 11, 2016
Dividend/Distribution payment date	Jun. 30, 2016
Series E Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 10,062
Preferred stock dividend per share amount ($ per share/unit) | $ / shares	$ 1.750
Series E Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 5,031
Series E Preferred Units | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	5,031
Series F Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 6,046
Preferred stock dividend per share amount ($ per share/unit) | $ / shares	$ 1.656
Series F Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 3,023
Series F Preferred Units | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	3,023
Series G Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 7,344
Preferred stock dividend per share amount ($ per share/unit) | $ / shares	$ 1.469
Series G Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 3,672
Series G Preferred Units | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	3,672
Series H Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 13,460
Preferred stock dividend per share amount ($ per share/unit) | $ / shares	$ 1.844
Series H Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 6,730
Series H Preferred Units | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	6,730
Series I Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 7,938
Preferred stock dividend per share amount ($ per share/unit) | $ / shares	$ 1.588
Series I Preferred Units | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	$ 3,969
Series I Preferred Units | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock	3,969
Common Stock
Dividends Payable [Line Items]
Dividends/Distributions, common units	$ 258,252
Common stock dividend per share amount ($ per share/unit) | $ / shares	$ 3.520
Common Stock | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, common units	$ 129,064
Common Stock | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, common units	$ 129,188