CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	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			$ 75,000			$ 2,253	$ 2,679,221	$ 932,277	$ (1,270,013)	$ 48,440	$ 2,582,178
Beginning Balance (in shares) at Dec. 31, 2017	4,600,000			3,000,000			225,321,660
Increase (Decrease) in Stockholders' Equity
Amortization of deferred stock compensation								2,113				2,113
Issuance of restricted common stock, net							$ 3	(4,235)				(4,232)
Issuance of restricted common stock, net (in shares)							297,013
Forfeiture of restricted common stock (in shares)							(3,961)
Common stock distributions and distributions payable										(11,281)		(11,281)
Preferred stock dividends and dividends payable		$ (1,998)	$ (1,998)		$ (1,209)	$ (1,209)
Distributions to noncontrolling interest											(1,169)	(1,169)
Net income									36,016		2,439	38,455
Ending Balance at Mar. 31, 2018	$ 115,000			$ 75,000			$ 2,256	2,677,099	968,293	(1,284,501)	49,710	2,602,857
Ending Balance (in shares) at Mar. 31, 2018	4,600,000			3,000,000			225,614,712
Beginning Balance at Dec. 31, 2018	$ 115,000			$ 75,000			$ 2,282	2,728,684	1,182,722	(1,440,202)	47,685	2,711,171
Beginning Balance (in shares) at Dec. 31, 2018	4,600,000			3,000,000			228,246,247
Increase (Decrease) in Stockholders' Equity
Amortization of deferred stock compensation								2,221				2,221
Issuance of restricted common stock, net							$ 4	(4,439)				(4,435)
Issuance of restricted common stock, net (in shares)							345,132
Forfeiture of restricted common stock (in shares)							(3,932)
Common stock distributions and distributions payable										(11,429)		(11,429)
Preferred stock dividends and dividends payable		$ (1,998)	$ (1,998)		$ (1,209)	$ (1,209)
Distributions to noncontrolling interest											(1,950)	(1,950)
Net income									16,317		1,599	17,916
Ending Balance at Mar. 31, 2019	$ 115,000			$ 75,000			$ 2,286	$ 2,726,466	$ 1,199,039	$ (1,454,838)	$ 47,334	$ 2,710,287
Ending Balance (in shares) at Mar. 31, 2019	4,600,000			3,000,000			228,587,447