CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Shares of Beneficial Interest, $1.00 Par	Capital Contributed in Excess of Par	Accumulated Other Comprehensive Loss	Distributions in Excess of Net Income	Non- controlling interest	Series B Preferred Stock Preferred Shares $.01 par	Series C Preferred Stock Preferred Shares $.01 par	Series D Preferred Stock Preferred Shares $.01 par
Beginning balance at Dec. 31, 2020	$ 126,940	$ 79,537	$ 1,771,777	$ (20,620)	$ (1,699,638)	$ (4,270)	$ 35	$ 69	$ 50
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(43,980)				(42,746)	(1,234)
Other comprehensive income (loss)	2,604			2,540		64
Shares issued under employee compensation plans, net of shares retired	(647)	(277)	(370)
Amortization of deferred compensation	1,321		1,321
Ending balance at Mar. 31, 2021	86,238	79,260	1,772,728	(18,080)	(1,742,384)	(5,440)	35	69	50
Beginning balance at Dec. 31, 2021	7,047	80,200	1,777,013	(8,830)	(1,832,375)	(9,115)	35	69	50
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(32,973)				(32,469)	(504)
Other comprehensive income (loss)	5,807			5,734		73
Shares issued under employee compensation plans, net of shares retired	4,449	417	4,032
Amortization of deferred compensation	814		814
Ending balance at Mar. 31, 2022	$ (14,856)	$ 80,617	$ 1,781,859	$ (3,096)	$ (1,864,844)	$ (9,546)	$ 35	$ 69	$ 50