Real Estate Properties and Investments (Summary of NHC Percentage Rent) (Details) - National Healthcare Corporation [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Investment Income [Line Items]
Operating Lease, Variable Lease Income	$ 3,531	$ 3,673	$ 3,984
Current year [Member]
Net Investment Income [Line Items]
Operating Lease, Variable Lease Income	3,536	3,687	3,650
Prior year final certification [Member]
Net Investment Income [Line Items]
Operating Lease, Variable Lease Income	$ 5	$ 14	$ 334

Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 6A
-URI http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration