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Cemetery Perpetual Care Trust Investments (The Components of Care trusts' corpus) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Care trusts’ corpus $ 49,856 $ 46,290
Perpetual Care Trust Invesments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trust assets, at market value 50,229 46,889
Obligations due from trust (373) (599)
Care trusts’ corpus $ 49,856 $ 46,290