Dispositions of Real Estate and Discontinued Operations - Schedule of Results of Discontinued Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other income (expense):
Income tax benefit (expense)	$ 0	$ 300,000	$ 1,000,000
Held-for-sale
Revenues:
Rental and related revenues	0	0	7,535,000
Resident fees and services	0	7,489,000	114,936,000
Total revenues	0	7,489,000	122,471,000
Costs and expenses:
Interest expense	0	0	3,900,000
Operating	0	6,452,000	122,571,000
Transaction and merger-related costs	0	0	76,000
Impairments and loan loss reserves (recoveries), net	0	0	32,736,000
Total costs and expenses	0	6,452,000	159,283,000
Other income (expense):
Gain (loss) on sales of real estate, net	0	1,344,000	414,721,000
Other income (expense), net	0	169,000	4,189,000
Total other income (expense), net	0	1,513,000	418,910,000
Income (loss) before income taxes and equity income (loss) from unconsolidated joint ventures	0	2,550,000	382,098,000
Income tax benefit (expense)	0	270,000	969,000
Equity income (loss) from unconsolidated joint ventures	0	64,000	5,135,000
Income (loss) from discontinued operations	$ 0	$ 2,884,000	$ 388,202,000