Equity (Series F Distributions Paid on a Percentage Basis) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Ordinary dividends	75.90%	6.00%	22.30%
Nontaxable distributions	0.00%	94.00%	77.70%
Capital gain distributions	24.10%	0.00%	0.00%
Total	100.00%	100.00%	100.00%
Preferred OP Units [Member]
Class of Stock [Line Items]
Ordinary dividends	75.90%	100.00%
Nontaxable distributions	0.00%	0.00%
Capital gain distributions	24.10%	0.00%
Total	100.00%	100.00%