CONSOLIDATED STATEMENTS OF EQUITY - 6 months ended Jun. 30, 2017 - 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, 2016	$ 115,000,000			$ 75,000,000			$ 2,201,000	$ 2,596,620,000	$ 786,901,000	$ (1,092,952,000)	$ 49,062,000	$ 2,531,832,000
Beginning Balance (in shares) at Dec. 31, 2016	4,600,000			3,000,000			220,073,140
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of common stock							$ 47,000	74,744,000				74,791,000
Number of shares of common stock sold (in shares)							4,685,023
Deferred stock compensation, net							$ 4,000	852,000				856,000
Deferred stock compensation, net (in shares)							394,012
Common stock distributions and distributions payable										(22,279,000)		(22,279,000)
Preferred stock dividends and dividends payable		$ (3,996,000)	$ (3,996,000)		$ (2,418,000)	$ (2,418,000)
Distributions to noncontrolling interest											(3,362,000)	(3,362,000)
Net income									111,067,000		4,175,000	115,242,000
Ending Balance at Jun. 30, 2017	$ 115,000,000			$ 75,000,000			$ 2,252,000	$ 2,672,216,000	$ 897,968,000	$ (1,121,645,000)	$ 49,875,000	$ 2,690,666,000
Ending Balance (in shares) at Jun. 30, 2017	4,600,000			3,000,000			225,152,175