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Investment Activity (Schedule of NHC Percentage Rent) (Details) - NHC - USD ($) $ in Thousands | 12 Months Ended
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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)

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