Dispositions of Real Estate and Discontinued Operations - Schedule of Results of Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other income (expense):
Income tax benefit (expense)	$ 300	$ 1,000	$ 10,000
Held-for-sale
Revenues:
Rental and related revenues	0	7,535	97,877
Resident fees and services	7,489	114,936	621,253
Total revenues	7,489	122,471	719,130
Costs and expenses:
Interest expense	0	3,900	10,538
Depreciation and amortization	0	0	143,194
Operating	6,452	122,571	550,226
Transaction costs	0	76	20,426
Impairments and loan loss reserves (recoveries), net	0	32,736	201,344
Total costs and expenses	6,452	159,283	925,728
Other income (expense):
Gain (loss) on sales of real estate, net	1,344	414,721	460,144
Other income (expense), net	169	4,189	5,475
Total other income (expense), net	1,513	418,910	465,619
Income (loss) before income taxes and equity income (loss) from unconsolidated joint ventures	2,550	382,098	259,021
Income tax benefit (expense)	270	969	9,913
Equity income (loss) from unconsolidated joint ventures	64	5,135	(1,188)
Income (loss) from discontinued operations	$ 2,884	$ 388,202	$ 267,746