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Preneed Trust Investments Preneed Trust Investments (Unrealized losses on cemetery merchandise and service trust investments) (Details) - Preneed Cemetery Trust Investments - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months $ 12,806 $ 15,566
Unrealized Losses, In Loss Position Less than12 months (1,616) (745)
Fair market value, In Loss Position Greater than12 months 12,361 20,056
Unrealized Losses, In Loss Position Greater than12 months (1,933) (3,827)
Fair market value, Total 25,167 35,622
Unrealized Losses, Total (3,549) (4,572)
Municipal bonds    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months   228
Unrealized Losses, In Loss Position Less than12 months   (4)
Fair market value, In Loss Position Greater than12 months   0
Unrealized Losses, In Loss Position Greater than12 months   0
Fair market value, Total   228
Unrealized Losses, Total   (4)
Foreign debt    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 151 2,523
Unrealized Losses, In Loss Position Less than12 months (6) (180)
Fair market value, In Loss Position Greater than12 months 1,637 2,868
Unrealized Losses, In Loss Position Greater than12 months (187) (475)
Fair market value, Total 1,788 5,391
Unrealized Losses, Total (193) (655)
Corporate debt    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 3,735 6,939
Unrealized Losses, In Loss Position Less than12 months (72) (233)
Fair market value, In Loss Position Greater than12 months 846 2,168
Unrealized Losses, In Loss Position Greater than12 months (201) (890)
Fair market value, Total 4,581 9,107
Unrealized Losses, Total (273) (1,123)
Preferred stock    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 48 3,217
Unrealized Losses, In Loss Position Less than12 months 0 (121)
Fair market value, In Loss Position Greater than12 months 8,109 11,635
Unrealized Losses, In Loss Position Greater than12 months (588) (826)
Fair market value, Total 8,157 14,852
Unrealized Losses, Total (588) (947)
Mortgage-backed securities    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 127 51
Unrealized Losses, In Loss Position Less than12 months (15) (5)
Fair market value, In Loss Position Greater than12 months 27 0
Unrealized Losses, In Loss Position Greater than12 months (9) 0
Fair market value, Total 154 51
Unrealized Losses, Total (24) (5)
Common stock    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 8,249 2,608
Unrealized Losses, In Loss Position Less than12 months (1,512) (202)
Fair market value, In Loss Position Greater than12 months 1,742 3,385
Unrealized Losses, In Loss Position Greater than12 months (948) (1,636)
Fair market value, Total 9,991 5,993
Unrealized Losses, Total (2,460) $ (1,838)
Mutual Fund [Member]    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 496  
Unrealized Losses, In Loss Position Less than12 months (11)  
Fair market value, In Loss Position Greater than12 months 0  
Unrealized Losses, In Loss Position Greater than12 months 0  
Fair market value, Total 496  
Unrealized Losses, Total $ (11)