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Preneed Activities Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 3,611,443 |
Available-for-sale Securities, Gross Unrealized Gains | 790,007 |
Available-for-sale Securities, Gross Unrealized Losses | (59,299) |
Available-for-sale Securities, Fair Value | 4,342,151 |
Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis |  | $ 3,569,675
Available-for-sale Securities, Gross Unrealized Gains |  | 687,303
Available-for-sale Securities, Gross Unrealized Losses |  | (88,603)
Available-for-sale Securities, Fair Value |  | 4,168,375
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 46,312 | 44,907
Available-for-sale Securities, Gross Unrealized Gains | 1,197 | 1,566
Available-for-sale Securities, Gross Unrealized Losses | (374) | (272)
Available-for-sale Securities, Fair Value | 47,135 | 46,201
Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 29,396 | 30,210
Available-for-sale Securities, Gross Unrealized Gains | 45 | 51
Available-for-sale Securities, Gross Unrealized Losses | (4) | (157)
Available-for-sale Securities, Fair Value | 29,437 | 30,104
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,445 | 1,669
Available-for-sale Securities, Gross Unrealized Gains | 10 | 14
Available-for-sale Securities, Gross Unrealized Losses | (15) | (8)
Available-for-sale Securities, Fair Value | 1,440 | 1,675
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,072 | 2,438
Available-for-sale Securities, Gross Unrealized Gains | 77 | 131
Available-for-sale Securities, Gross Unrealized Losses | (5) | 0
Available-for-sale Securities, Fair Value | 1,144 | 2,569
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 283 | 174
Available-for-sale Securities, Gross Unrealized Gains | 2 | 3
Available-for-sale Securities, Gross Unrealized Losses | (17) | (5)
Available-for-sale Securities, Fair Value | 268 | 172
Fair Value, Inputs, Level 2 [Member] | Preferred Stock securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,378 | 358
Available-for-sale Securities, Gross Unrealized Gains | 54 | 0
Available-for-sale Securities, Gross Unrealized Losses | (5) | (24)
Available-for-sale Securities, Fair Value | 1,427 | 334
Fair Value, Inputs, Level 1 [Member] | US Common Stock Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,538,711 | 1,500,125
Available-for-sale Securities, Gross Unrealized Gains | 590,244 | 503,757
Available-for-sale Securities, Gross Unrealized Losses | (35,351) | (54,748)
Available-for-sale Securities, Fair Value | 2,093,604 | 1,949,134
Fair Value, Inputs, Level 1 [Member] | Canada Common Stock Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 41,103 | 35,016
Available-for-sale Securities, Gross Unrealized Gains | 14,098 | 10,915
Available-for-sale Securities, Gross Unrealized Losses | (2,165) | (1,823)
Available-for-sale Securities, Fair Value | 53,036 | 44,108
Fair Value, Inputs, Level 1 [Member] | Other International Common Stock Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 102,439 | 110,775
Available-for-sale Securities, Gross Unrealized Gains | 40,452 | 39,837
Available-for-sale Securities, Gross Unrealized Losses | (2,430) | (1,831)
Available-for-sale Securities, Fair Value | 140,461 | 148,781
Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 800,930 | 821,406
Available-for-sale Securities, Gross Unrealized Gains | 125,413 | 95,155
Available-for-sale Securities, Gross Unrealized Losses | (5,679) | (10,437)
Available-for-sale Securities, Fair Value | 920,664 | 906,124
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,048,187 | 1,022,409
Available-for-sale Securities, Gross Unrealized Gains | 18,413 | 35,872
Available-for-sale Securities, Gross Unrealized Losses | (13,254) | (19,298)
Available-for-sale Securities, Fair Value | 1,053,346 | 1,038,983
Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 187 | 188
Available-for-sale Securities, Gross Unrealized Gains | 2 | 2
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities, Fair Value | 189 | 190
Reported Value Measurement [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,536,644 |
Available-for-sale Securities, Gross Unrealized Gains | 194,332 |
Available-for-sale Securities, Gross Unrealized Losses | (10,423) |
Available-for-sale Securities, Fair Value | 1,720,553 |
Reported Value Measurement [Member] | Commingled funds - Fixed inc [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 660,474 | 657,219
Available-for-sale Securities, Gross Unrealized Gains | 26,441 | 37,474
Available-for-sale Securities, Gross Unrealized Losses | (2,329) | (173)
Available-for-sale Securities, Fair Value | 684,586 | 694,520
Reported Value Measurement [Member] | Commingled funds - Equity [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 278,866 | 283,329
Available-for-sale Securities, Gross Unrealized Gains | 100,757 | 97,704
Available-for-sale Securities, Gross Unrealized Losses | (93) | 0
Available-for-sale Securities, Fair Value | 379,530 | 381,033
Reported Value Measurement [Member] | Money Market Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 326,518 | 330,745
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities, Fair Value | 326,518 | 330,745
Reported Value Measurement [Member] | Private Equity Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 270,786 | 217,953
Available-for-sale Securities, Gross Unrealized Gains | 67,134 | 68,846
Available-for-sale Securities, Gross Unrealized Losses | (8,001) | (10,284)
Available-for-sale Securities, Fair Value | 329,919 | 276,515
Reported Value Measurement [Member] | Reported At Net Asset Value [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis |  | 1,489,246
Available-for-sale Securities, Gross Unrealized Gains |  | 204,024
Available-for-sale Securities, Gross Unrealized Losses |  | (10,457)
Available-for-sale Securities, Fair Value |  | 1,682,813
Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 5,148,087 | 5,058,921
Available-for-sale Securities, Gross Unrealized Gains | 984,339 | 891,327
Available-for-sale Securities, Gross Unrealized Losses | (69,722) | (99,060)
Available-for-sale Securities, Fair Value | $ 6,062,704 | $ 5,851,188

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