Investment Activity (Schedule of Tenant Concentrations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Tenant Concentration [Line Items]
Gross Real Estate	$ 2,783,370		$ 2,780,358
Total Gross Real Estate	2,444,078
Total notes receivable	274,349
Revenues	62,187	$ 65,299
Escrow funds received from tenants for property operating expenses	2,733	2,619
Resident fees and services	13,256	11,700
Total revenues	$ 81,513	$ 82,388
Percentage of continuing revenue	16.00%	14.00%
Senior Living Communities, LLC (“Senior Living”)
Tenant Concentration [Line Items]
Gross Real Estate	$ 573,631
Notes Receivable	48,200
Revenues	$ 12,815	$ 12,833
Percentage of continuing revenue	16.00%	16.00%
National HealthCare Corporation (“NHC”)
Tenant Concentration [Line Items]
Gross Real Estate	$ 133,770
Notes Receivable	0
Revenues	$ 11,246	$ 9,807
Percentage of continuing revenue	14.00%	12.00%
Bickford
Tenant Concentration [Line Items]
Gross Real Estate	$ 429,043
Notes Receivable	16,747
Revenues	$ 10,054	$ 11,162
Percentage of continuing revenue	12.00%	14.00%
All others, net
Tenant Concentration [Line Items]
Gross Real Estate	$ 1,307,634
Notes Receivable	209,402
Revenues	$ 31,409	$ 34,267
Percentage of continuing revenue	39.00%	41.00%
Tenants With Escrow Funds
Tenant Concentration [Line Items]
Percentage of continuing revenue	3.00%	3.00%
More than 10% Operators
Tenant Concentration [Line Items]
Revenues	$ 68,257	$ 70,688