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Cemetery Perpetual Care Trust Investments (Perpetual care trust investment security transactions recorded in interest income and other, net) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Decrease (increase) in deferred preneed cemetery receipts held in trust | $ (4,579) | $ (5,111) | $ (6,017)
Perpetual Care Trust Investments | Other Interest Income |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Realized gains | 1,364 | 926 | 872
Realized losses | (1,896) | (1,195) | (3,069)
Decrease (increase) in deferred preneed cemetery receipts held in trust | $ 532 | $ 269 | $ 2,197

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