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Investment Activity (Schedule of Tenant Concentrations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Real Estate [Line Items]
Gross Real Estate	$ 2,780,358	$ 2,729,898
Total gross real estate	2,430,413
Total notes receivable	260,747
Revenues	249,227	217,700	$ 271,049
Escrow funds received from tenants for property operating expenses	11,513	9,788	11,638
Resident fees and services	48,809	35,796	0
Total revenues	$ 319,835	$ 278,194	$ 298,715
Percentage of continuing revenue	15.00%	13.00%	0.00%
Escrow funds received from tenants for property operating expenses
Real Estate [Line Items]
Revenues	$ 11,513	$ 9,788	$ 11,600
Senior Living Communities
Real Estate [Line Items]
Gross Real Estate	573,631
Notes Receivable	48,950
Revenues	$ 51,274	$ 51,183	$ 50,726
Percentage of continuing revenue	16.00%	18.00%	17.00%
NHC
Real Estate [Line Items]
Gross Real Estate	$ 133,770
Notes Receivable	0
Revenues	$ 37,335	$ 36,893	$ 37,735
Percentage of continuing revenue	12.00%	13.00%	12.00%
Bickford
Real Estate [Line Items]
Gross Real Estate	$ 429,043
Notes Receivable	16,795
Revenues	$ 38,688		$ 34,599
Percentage of continuing revenue	12.00%		12.00%
All others, net
Real Estate [Line Items]
Gross Real Estate	$ 1,293,969
Notes Receivable	195,002
Revenues	$ 132,216	$ 144,534	$ 164,017
Percentage of continuing revenue	41.00%	52.00%	55.00%
Tenants With Escrow Funds
Real Estate [Line Items]
Percentage of continuing revenue	4.00%	4.00%	4.00%
More than 10% Operators
Real Estate [Line Items]
Revenues	$ 271,026	$ 242,398	$ 298,715

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