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Cemetery Perpetual Care Trust Investments Cemetery Perpetual Care Trust Investments (Unrealized losses on perpetual care trust investments) (Details) - Perpetual Care Trust Invesments - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months $ 8,370 $ 10,067
Unrealized Losses, In Loss Position Less than12 months (1,073) (476)
Fair market value, In Loss Position Greater than12 months 8,299 13,733
Unrealized Losses, In Loss Position Greater than12 months (1,279) (2,596)
Fair market value, Total 16,669 23,800
Unrealized Losses, Total (2,352) (3,072)
Municipal bonds    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months   137
Unrealized Losses, In Loss Position Less than12 months   (3)
Fair market value, In Loss Position Greater than12 months   0
Unrealized Losses, In Loss Position Greater than12 months   0
Fair market value, Total   137
Unrealized Losses, Total   (3)
Foreign debt    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 92 1,619
Unrealized Losses, In Loss Position Less than12 months (3) (120)
Fair market value, In Loss Position Greater than12 months 1,128 1,961
Unrealized Losses, In Loss Position Greater than12 months (131) (315)
Fair market value, Total 1,220 3,580
Unrealized Losses, Total (134) (435)
Corporate debt    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 2,621 4,679
Unrealized Losses, In Loss Position Less than12 months (59) (152)
Fair market value, In Loss Position Greater than12 months 555 1,439
Unrealized Losses, In Loss Position Greater than12 months (128) (669)
Fair market value, Total 3,176 6,118
Unrealized Losses, Total (187) (821)
Preferred stock    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months   2,038
Unrealized Losses, In Loss Position Less than12 months   (77)
Fair market value, In Loss Position Greater than12 months   8,329
Unrealized Losses, In Loss Position Greater than12 months   (587)
Fair market value, Total   10,367
Unrealized Losses, Total   (664)
Preferred stock    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 29  
Unrealized Losses, In Loss Position Less than12 months 0  
Fair market value, In Loss Position Greater than12 months 5,492  
Unrealized Losses, In Loss Position Greater than12 months (411)  
Fair market value, Total 5,521  
Unrealized Losses, Total (411)  
Mortgage-backed securities    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 76 31
Unrealized Losses, In Loss Position Less than12 months (10) (3)
Fair market value, In Loss Position Greater than12 months 16 0
Unrealized Losses, In Loss Position Greater than12 months (5) 0
Fair market value, Total 92 31
Unrealized Losses, Total (15) (3)
Common stock    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 5,119 1,563
Unrealized Losses, In Loss Position Less than12 months (991) (121)
Fair market value, In Loss Position Greater than12 months 1,108 2,004
Unrealized Losses, In Loss Position Greater than12 months (604) (1,025)
Fair market value, Total 6,227 3,567
Unrealized Losses, Total (1,595) $ (1,146)
Mutual Fund [Member]    
Gain (Loss) on Investments [Line Items]    
Fair market value, In Loss Position Less than12 months 433  
Unrealized Losses, In Loss Position Less than12 months (10)  
Fair market value, In Loss Position Greater than12 months 0  
Unrealized Losses, In Loss Position Greater than12 months 0  
Fair market value, Total 433  
Unrealized Losses, Total $ (10)