CONSOLIDATED STATEMENTS OF EQUITY - 6 months ended Jun. 30, 2018 - USD ($)	Series E Cumulative Redeemable Preferred Stock Preferred Stock	Series E Cumulative Redeemable Preferred Stock Cumulative dividends and distributions	Series E Cumulative Redeemable Preferred Stock	Series F Cumulative Redeemable Preferred Stock Preferred Stock	Series F Cumulative Redeemable Preferred Stock Cumulative dividends and distributions	Series F Cumulative Redeemable Preferred Stock	Common Stock	Additional Paid In Capital	Retained Earnings	Cumulative dividends and distributions	Noncontrolling Interest in Consolidated Joint Venture	Total
Beginning Balance at Dec. 31, 2017	$ 115,000,000			$ 75,000,000			$ 2,253,000	$ 2,679,221,000	$ 932,277,000	$ (1,270,013,000)	$ 48,440,000	$ 2,582,178,000
Beginning Balance (in shares) at Dec. 31, 2017	4,600,000			3,000,000			225,321,660
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of common stock							$ 26,000	44,315,000				44,341,000
Number of shares of common stock sold (in shares)							2,590,854
Deferred stock compensation, net							$ 4,000	843,000				847,000
Deferred stock compensation, net (in shares)							341,741
Common stock distributions and distributions payable										(22,694,000)		(22,694,000)
Preferred stock dividends and dividends payable		$ (3,996,000)	$ (3,996,000)		$ (2,418,000)	$ (2,418,000)
Distributions to noncontrolling interest											(2,644,000)	(2,644,000)
Net income									84,904,000		4,813,000	89,717,000
Ending Balance at Jun. 30, 2018	$ 115,000,000			$ 75,000,000			$ 2,283,000	$ 2,724,379,000	$ 1,017,181,000	$ (1,299,121,000)	$ 50,609,000	$ 2,685,331,000
Ending Balance (in shares) at Jun. 30, 2018	4,600,000			3,000,000			228,254,255