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Preneed Trust Investments (Unrealized losses on cemetery merchandise and service trust investments) (Details) - Preneed Cemetery Trust Investments [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 25,155 $ 12,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3,031) (1,616)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12,407 12,361
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,481) (1,933)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 37,562 25,167
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (5,512) (3,549)
Available-for-sale Securities, Amortized Cost Basis 71,783 71,306
Unrealized Gains 5,426 7,535
Foreign Debt [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 519 151
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (20) (6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,605 1,637
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (224) (187)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,124 1,788
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (244) (193)
Corporate Debt [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 6,987 3,735
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (464) (72)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 768 846
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (201) (201)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 7,755 4,581
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (665) (273)
Preferred Stock [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,731 48
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (43) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 8,295 8,109
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (708) (588)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 13,026 8,157
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (751) (588)
Mortgage Backed Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 75 127
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (15)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 73 27
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (26) (9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 148 154
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (26) (24)
Available-for-sale Securities, Amortized Cost Basis   1,018
Unrealized Gains   249
Common Stock [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12,001 8,249
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,461) (1,512)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,666 1,742
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,322) (948)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 13,667 9,991
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (3,783) (2,460)
Mutual Fund [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 842 496
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (43) (11)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 842 496
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (43) (11)
Fair Value, Inputs, Level 1 [Member] | Common Stock [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 25,216 26,465
Unrealized Gains 4,074 5,250
Fair Value, Inputs, Level 2 [Member] | Corporate Debt [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 15,665 18,238
Unrealized Gains 733 $ 1,184
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 1,015  
Unrealized Gains $ 281