CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Revenue	$ 1,283,566	$ 1,383,212	$ 1,632,026
Expenses:
Property operating expenses	1,109,070	1,091,812	1,236,357
Depreciation and amortization	239,280	271,131	270,147
General and administrative	26,435	34,087	30,593
Acquisition and certain other transaction related costs	2,605	17,506	814
Impairment of assets	0	(174)	106,972
Total expenses	1,377,390	1,414,362	1,644,883
Gain on sale of properties	321,862	492,272	6,487
Gains and losses on equity securities, net	(25,660)	(42,232)	34,106
Interest and other income	15,929	20,635	18,221
Interest expense (including net amortization of debt premiums, discounts and issuance costs of $8,658, $13,408 and $8,022, respectively)	(209,383)	(255,759)	(201,483)
Gain on lease termination	0	0	22,896
Loss on modification or early extinguishment of debt	(30,043)	(2,410)	(427)
(Loss) income from continuing operations before income tax expense and equity in net earnings of investees	(21,119)	181,356	(133,057)
Income tax expense	(710)	(1,430)	(1,250)
Equity in net earnings of investees	6,055	0	0
Net (loss) income	(15,774)	179,926	(134,307)
Net income attributable to noncontrolling interest	0	(5,411)	(5,146)
Net (loss) income attributable to common shareholders	$ (15,774)	$ 174,515	$ (139,453)
Weighted average shares used in computing earnings per common share:
Weighted average common shares outstanding (basic) (in shares)	238,314	237,967	237,739
Weighted average common shares outstanding (diluted) (in shares)	238,314	237,967	237,739
Per common share amounts (basic and diluted)
Net income (loss) attributable to common shareholders - basic (in dollars per share)	$ (0.07)	$ 0.73	$ (0.59)
Net income (loss) attributable to common shareholders - diluted (in dollars per share)	$ (0.07)	$ 0.73	$ (0.59)
Rental income
Revenues:
Revenue	$ 260,740	$ 408,589	$ 427,215
Residents fees and services
Revenues:
Revenue	$ 1,022,826	$ 974,623	$ 1,204,811