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Preneed Activities Schedule of Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 3,241,118 $ 3,032,413
Accumulated Gross Unrealized Gain, before Tax 315,026 196,492
Accumulated Gross Unrealized Loss, before Tax (56,149) (151,197)
Available-for-sale Securities, Fair Value 3,499,995 3,077,708
Reported at net asset value    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 844,920 868,315
Accumulated Gross Unrealized Gain, before Tax 17,112 18,336
Accumulated Gross Unrealized Loss, before Tax (18,946) (27,451)
Available-for-sale Securities, Fair Value 843,086 859,200
Estimate of Fair Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 4,086,038 3,900,728
Accumulated Gross Unrealized Gain, before Tax 332,138 214,828
Accumulated Gross Unrealized Loss, before Tax (75,095) (178,648)
Available-for-sale Securities, Fair Value 4,343,081 3,936,908
Fixed Income Commingled funds [Member] | Reported at net asset value    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 653,105 692,434
Accumulated Gross Unrealized Gain, before Tax 1,103 8,524
Accumulated Gross Unrealized Loss, before Tax (6,095) (12,234)
Available-for-sale Securities, Fair Value 648,113 688,724
Private Equity Funds | Reported at net asset value    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 191,815 175,881
Accumulated Gross Unrealized Gain, before Tax 16,009 9,812
Accumulated Gross Unrealized Loss, before Tax (12,851) (15,217)
Available-for-sale Securities, Fair Value 194,973 170,476
Fair Value, Inputs, Level 2 | US Treasury Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 24,704 145,315
Accumulated Gross Unrealized Gain, before Tax 25 884
Accumulated Gross Unrealized Loss, before Tax (12) (838)
Available-for-sale Securities, Fair Value 24,717 145,361
Fair Value, Inputs, Level 2 | Foreign Government Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 84,387 79,141
Accumulated Gross Unrealized Gain, before Tax 182 409
Accumulated Gross Unrealized Loss, before Tax (904) (222)
Available-for-sale Securities, Fair Value 83,665 79,328
Fair Value, Inputs, Level 2 | Corporate Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 16,720 18,934
Accumulated Gross Unrealized Gain, before Tax 374 295
Accumulated Gross Unrealized Loss, before Tax (139) (227)
Available-for-sale Securities, Fair Value 16,955 19,002
Fair Value, Inputs, Level 2 | Residential Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 427 333
Accumulated Gross Unrealized Gain, before Tax 16 1
Accumulated Gross Unrealized Loss, before Tax (1) (1)
Available-for-sale Securities, Fair Value 442 333
Fair Value, Inputs, Level 2 | Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 317 448
Accumulated Gross Unrealized Gain, before Tax 18 16
Accumulated Gross Unrealized Loss, before Tax (7) (31)
Available-for-sale Securities, Fair Value 328 433
Fair Value, Inputs, Level 2 | Preferred Stock Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 8,127 2,907
Accumulated Gross Unrealized Gain, before Tax 166 83
Accumulated Gross Unrealized Loss, before Tax (159) (156)
Available-for-sale Securities, Fair Value 8,134 2,834
Fair Value, Inputs, Level 1 | US Common Stock Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 1,184,510 1,107,942
Accumulated Gross Unrealized Gain, before Tax 213,024 151,146
Accumulated Gross Unrealized Loss, before Tax (22,703) (35,542)
Available-for-sale Securities, Fair Value 1,374,831 1,223,546
Fair Value, Inputs, Level 1 | Canada Common Stock Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 33,167 25,708
Accumulated Gross Unrealized Gain, before Tax 11,612 10,030
Accumulated Gross Unrealized Loss, before Tax (942) (455)
Available-for-sale Securities, Fair Value 43,837 35,283
Fair Value, Inputs, Level 1 | Other International Common Stock Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 57,114 83,238
Accumulated Gross Unrealized Gain, before Tax 13,546 4,995
Accumulated Gross Unrealized Loss, before Tax (1,137) (10,632)
Available-for-sale Securities, Fair Value 69,523 77,601
Fair Value, Inputs, Level 1 | Equity Funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 607,088 688,120
Accumulated Gross Unrealized Gain, before Tax 56,277 19,962
Accumulated Gross Unrealized Loss, before Tax (6,304) (56,857)
Available-for-sale Securities, Fair Value 657,061 651,225
Fair Value, Inputs, Level 1 | Fixed Income Funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 1,218,188 875,615
Accumulated Gross Unrealized Gain, before Tax 17,273 6,203
Accumulated Gross Unrealized Loss, before Tax (23,794) (46,219)
Available-for-sale Securities, Fair Value 1,211,667 835,599
Fair Value, Inputs, Level 3 | Other Investments    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 6,369 4,712
Accumulated Gross Unrealized Gain, before Tax 2,513 2,468
Accumulated Gross Unrealized Loss, before Tax (47) (17)
Available-for-sale Securities, Fair Value $ 8,835 $ 7,163