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Cemetery Perpetual Care Trust Investments (Purchases and sales of investments in perpetual care trusts) (Details) - Perpetual Care Trust Investments - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt and Equity Securities, FV-NI [Line Items]      
Purchases $ (17,313) $ (13,923) $ (16,546)
Sales $ 25,786 $ 8,899 $ 16,534