Real Property Acquisitions and Development - Construction Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Total construction in progress conversions	$ 73,458	$ 22,990
Seniors Housing Operating
Segment Reporting Information [Line Items]
Total development projects	73,458	0
Triple-net
Segment Reporting Information [Line Items]
Total development projects	$ 0	$ 22,990