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Preneed Trust Investments (Purchases and sales of investments in preneed cemetery trusts) (Details) - Preneed Cemetery 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 $ (27,006) $ (21,966) $ (25,643)
Sales $ 39,180 $ 14,002 $ 25,846