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Cemetery Perpetual Care Trust Investments (Purchases and sales of investments in perpetual care trusts) (Details) - Perpetual Care Trust Invesments [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Purchases $ (9,157) $ (1,929)
Sales $ 1,702 $ 4,965