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Investment Activity (Schedule of NHC Percentage Rent) (Details) - NHC - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Investment Income [Line Items]      
Rent income from NHC $ 4,492 $ 3,126 $ 3,531
Current year      
Net Investment Income [Line Items]      
Rent income from NHC 3,862 3,332 3,536
Prior year final certification      
Net Investment Income [Line Items]      
Rent income (loss) from NHC $ 630 $ (206) $ (5)