Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Preferred Units [Line Items]
Preferred Units, Total Annual Cash Distributions			$ 1,600,000.0
Series I 2 [Member]
Preferred Units [Line Items]
Noncontrolling Interest in Operating Partnerships	$ 7,537,000
Redeemable stock, preferred units outstanding	301
Redeemable Preferred Units Liquidation Preference	$ 25
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount	6.25%
Preferred Units, Total Annual Cash Distributions	$ 472,000	$ 472,000	$ 472,000