CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Rental income	$ 576,482	$ 587,919	$ 678,404
Expenses:
Real estate taxes	71,970	65,119	73,717
Utility expenses	25,251	25,384	34,302
Other operating expenses	105,825	105,465	120,943
Depreciation and amortization	241,494	251,566	289,885
Loss on Impairment of Real Estate	62,420	2,954	22,255
Acquisition and transaction related costs	0	232	682
General and administrative	26,858	28,443	32,728
Total expenses	533,818	479,163	574,512
Gain on sale of real estate	78,354	10,855	105,131
Dividend income	0	0	1,960
Loss on equity securities, net	0	0	(44,007)
Interest and other income	7	779	1,045
Interest expense (including net amortization of debt premiums, discounts and issuance costs of $9,771, $9,593 and $10,740, respectively)	(112,385)	(108,303)	(134,880)
Loss on early extinguishment of debt	(14,068)	(3,839)	(769)
Income (loss) before income tax expense and equity in net losses of investees	(5,428)	8,248	32,372
Income tax expense	(251)	(377)	(778)
Equity in net losses of investees	(2,501)	(1,193)	(1,259)
Net income (loss)	(8,180)	6,678	30,335
Other comprehensive income (loss):
Unrealized gain (loss) on financial instrument	0	200	(200)
Equity in unrealized loss of investees	0	0	(106)
Other comprehensive income (loss)	0	200	(306)
Comprehensive income (loss)	$ (8,180)	$ 6,878	$ 30,029
Weighted average common shares outstanding, basic (in shares)	48,195	48,124	48,062
Weighted average common shares outstanding, diluted (in shares)	48,195	48,124	48,062
Per common share amounts (basic and diluted):
Net income (loss) per share, basic	$ (0.17)	$ 0.14	$ 0.63
Net income (loss) per share, diluted	$ (0.17)	$ 0.14	$ 0.63