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Trust Investments (Preneed cemetery trust investment security transactions) (Details) - Preneed Cemetery Trust Investments [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Debt and Equity Securities, FV-NI [Line Items] |  |
Unrealized Gain (Loss) on Investments | $ 9,708 | $ (16,305)
Interest Income and Other, Net [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investment income | 467 | 319
Realized gain, net | 4,092 | 1,916
Realized losses | (2,518) | (1,372)
Expenses and taxes | (327) | (187)
Increase (decrease) in deferred preneed cemetery receipts held in trust | $ (11,422) | $ 15,629

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