Real Property Acquisitions and Development - Construction Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Development projects:
Total development projects	$ 272,573	$ 265,555	$ 211,830
Expansion projects	18,280	5,292	48,600
Total construction in progress conversions	290,853	270,847	260,430
Seniors Housing Operating
Development projects:
Total development projects	227,796	117,386	93,188
Triple-net
Development projects:
Total development projects	0	22,990	75,149
Outpatient Medical
Development projects:
Total development projects	$ 44,777	$ 125,179	$ 43,493