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Preneed Trust Investments Preneed Trust Investments (Unrealized losses on preneed funeral trust investments) (Details) - Preneed Funeral 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 $ 14,075 $ 17,076
Unrealized Losses, In Loss Position Less than12 months (1,620) (772)
Fair market value, In Loss Position Greater than12 months 13,013 20,934
Unrealized Losses, In Loss Position Greater than12 months (1,990) (3,944)
Fair market value, Total 27,088 38,010
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (3,610) (4,716)
U.S. treasury debt    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 1,325 834
Unrealized Losses, In Loss Position Less than12 months (15) (10)
Fair market value, In Loss Position Greater than12 months 0 0
Unrealized Losses, In Loss Position Greater than12 months 0 0
Fair market value, Total 1,325 834
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (15) (10)
Municipal bonds    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months   244
Unrealized Losses, In Loss Position Less than12 months   (5)
Fair market value, In Loss Position Greater than12 months   0
Unrealized Losses, In Loss Position Greater than12 months   0
Fair market value, Total   244
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (5)
Foreign debt    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 159 2,654
Unrealized Losses, In Loss Position Less than12 months (6) (186)
Fair market value, In Loss Position Greater than12 months 1,608 2,905
Unrealized Losses, In Loss Position Greater than12 months (183) (490)
Fair market value, Total 1,767 5,559
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (189) (676)
Corporate debt    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 3,770 6,977
Unrealized Losses, In Loss Position Less than12 months (74) (215)
Fair market value, In Loss Position Greater than12 months 842 2,234
Unrealized Losses, In Loss Position Greater than12 months (203) (919)
Fair market value, Total 4,612 9,211
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (277) (1,134)
Preferred stock    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 50 3,420
Unrealized Losses, In Loss Position Less than12 months 0 (128)
Fair market value, In Loss Position Greater than12 months 8,184 11,750
Unrealized Losses, In Loss Position Greater than12 months (585) (842)
Fair market value, Total 8,234 15,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (585) (970)
Mortgage-backed securities    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 221 55
Unrealized Losses, In Loss Position Less than12 months (17) (5)
Fair market value, In Loss Position Greater than12 months 36 11
Unrealized Losses, In Loss Position Greater than12 months (10) (1)
Fair market value, Total 257 66
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (27) (6)
Equity    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months   2,795
Unrealized Losses, In Loss Position Less than12 months   (216)
Fair market value, In Loss Position Greater than12 months   3,390
Unrealized Losses, In Loss Position Greater than12 months   (1,634)
Fair market value, Total   6,185
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (1,850)
Common stock    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 8,001  
Unrealized Losses, In Loss Position Less than12 months (1,496)  
Fair market value, In Loss Position Greater than12 months 1,728  
Unrealized Losses, In Loss Position Greater than12 months (972)  
Fair market value, Total 9,729  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (2,468)  
Fixed income    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 549 97
Unrealized Losses, In Loss Position Less than12 months (12) (7)
Fair market value, In Loss Position Greater than12 months 615 644
Unrealized Losses, In Loss Position Greater than12 months (37) (58)
Fair market value, Total 1,164 741
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (49) $ (65)