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Preneed Trust Investments (Purchases and sales of investments in preneed cemetery trusts) (Details) - Preneed Cemetery Trust Investments [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Purchases $ (11,626) $ (3,376)
Sales $ 2,992 $ 7,559