Real Property Acquisitions and Development - Construction Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total construction in progress conversions	$ 134,562	$ 183,701
Seniors Housing Operating
Segment Reporting Information [Line Items]
Total development projects	134,562	58,844
Triple-net
Segment Reporting Information [Line Items]
Total development projects	0	22,990
Outpatient Medical
Segment Reporting Information [Line Items]
Total development projects	$ 0	$ 101,867