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Real Estate (Schedule of Tenant Concentrations) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) properties	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) properties	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Number of Properties | properties	228		228
Property, Plant and Equipment, Gross	$ 3,264,564		$ 3,264,564		$ 3,074,846
Loans and Leases Receivable, Net Amount	287,282		287,282		$ 340,143
Operating Leases, Income Statement, Lease Revenue	77,821	$ 75,247	232,266	$ 218,777
Financing Receivable, Allowance for Credit Loss	$ 4,907	$ 0	$ 4,907	0
Senior Living Communities [Member]
Number of Properties | properties	10		10
Property, Plant and Equipment, Gross	$ 573,631		$ 573,631
Loans and Leases Receivable, Net Amount	$ 38,870		38,870
Operating Leases, Income Statement, Lease Revenue			$ 38,972	$ 36,914
Percentage of Continuing Revenue			15.00%	16.00%
Holiday Acquisition Holdings [Member]
Number of Properties | properties	26		26
Property, Plant and Equipment, Gross	$ 531,378		$ 531,378
Loans and Leases Receivable, Net Amount	$ 0		0
Operating Leases, Income Statement, Lease Revenue			$ 30,529	$ 30,283
Percentage of Continuing Revenue			12.00%	13.00%
Bickford Senior Living [Member]
Number of Properties | properties	48		48
Property, Plant and Equipment, Gross	$ 534,376		$ 534,376
Loans and Leases Receivable, Net Amount	$ 33,458		33,458
Operating Leases, Income Statement, Lease Revenue			$ 39,142	$ 39,356
Percentage of Continuing Revenue			16.00%	17.00%
National Healthcare Corporation [Member]
Number of Properties | properties	42		42
Property, Plant and Equipment, Gross	$ 171,297		$ 171,297
Loans and Leases Receivable, Net Amount	0		0
Operating Leases, Income Statement, Lease Revenue			$ 28,362	$ 28,670
Percentage of Continuing Revenue			11.00%	12.00%
Less than 10% Operators [Member]
Property, Plant and Equipment, Gross	1,451,204		$ 1,451,204
Loans and Leases Receivable, Net Amount	$ 219,861		219,861
Operating Leases, Income Statement, Lease Revenue			$ 114,567	$ 100,663

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