CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Rental income	$ 554,275	$ 576,482	$ 587,919
Expenses:
Real estate taxes	57,844	71,970	65,119
Utility expenses	27,005	25,251	25,384
Other operating expenses	110,366	105,825	105,465
Depreciation and amortization	222,564	241,494	251,566
Loss on impairment of real estate	21,820	62,420	2,954
Acquisition and transaction related costs	292	0	232
General and administrative	25,134	26,858	28,443
Total expenses	465,025	533,818	479,163
Gain on sale of real estate	11,001	78,354	10,855
Interest and other income	217	7	779
Interest expense (including net amortization of debt premiums, discounts and issuance costs of $9,134, $9,771 and $9,593, respectively)	(103,480)	(112,385)	(108,303)
Gain (loss) on early extinguishment of debt	682	(14,068)	(3,839)
Income (loss) before income tax expense and equity in net losses of investees	(2,330)	(5,428)	8,248
Income tax expense	(270)	(251)	(377)
Equity in net losses of investees	(3,509)	(2,501)	(1,193)
Net income (loss)	(6,109)	(8,180)	6,678
Other comprehensive income:
Unrealized gain on financial instrument	0	0	200
Other comprehensive income	0	0	200
Comprehensive income (loss)	$ (6,109)	$ (8,180)	$ 6,878
Weighted average common shares outstanding, basic (in shares)	48,278	48,195	48,124
Weighted average common shares outstanding, diluted (in shares)	48,278	48,195	48,124
Per common share amounts (basic and diluted):
Net income (loss) - basic (in dollars per share)	$ (0.14)	$ (0.17)	$ 0.14
Net income (loss) - diluted (in dollars per share)	$ (0.14)	$ (0.17)	$ 0.14