Preneed Activities Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Estimate of Fair Value Measurement [Member]
Schedule of unrealized loss on investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 42,347	$ 55,264
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,149)	(797)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	24,736	11,154
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,371)	(603)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	67,083	66,418
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (2,520)	(1,400)
Document Period End Date	Jun. 30, 2018
US Treasury Securities
Schedule of unrealized loss on investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 25,245	29,014
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(530)	(115)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,382	106
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(39)	(2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	27,627	29,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(569)	(117)
Foreign Government Debt Securities
Schedule of unrealized loss on investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,693	20,947
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(481)	(639)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	16,233	6,370
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,050)	(450)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	25,926	27,317
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,531)	(1,089)
Corporate Debt Securities
Schedule of unrealized loss on investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,541	2,423
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(60)	(31)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5,944	4,453
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(269)	(139)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	10,485	6,876
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(329)	(170)
Residential Mortgage Backed Securities
Schedule of unrealized loss on investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,868	2,880
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(78)	(12)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	99	151
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2)	(2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,967	3,031
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(80)	(14)
Asset-backed Securities
Schedule of unrealized loss on investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	78	74
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(11)	(10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	78	74
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (11)	$ (10)