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Preneed Activities Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | $ 3,659,788 |
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 832,952 |
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (78,145) |
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 4,414,595 |
Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss |  | $ 3,569,675
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain |  | 687,303
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss |  | (88,603)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value |  | 4,168,375
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 50,019 | 44,907
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 1,029 | 1,566
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (333) | (272)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 50,715 | 46,201
Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 30,035 | 30,210
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 34 | 51
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (12) | (157)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 30,057 | 30,104
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 497 | 1,669
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 8 | 14
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (10) | (8)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 495 | 1,675
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,374 | 2,438
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 72 | 131
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (8) | 0
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 1,438 | 2,569
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 283 | 174
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 3 | 3
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (9) | (5)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 277 | 172
Fair Value, Inputs, Level 2 [Member] | Preferred Stock securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 4,843 | 358
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 41 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (71) | (24)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 4,813 | 334
Fair Value, Inputs, Level 1 [Member] | US Common Stock Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,582,652 | 1,500,125
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 562,106 | 503,757
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (60,243) | (54,748)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 2,084,515 | 1,949,134
Fair Value, Inputs, Level 1 [Member] | Canada Common Stock Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 47,178 | 35,016
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 19,185 | 10,915
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (1,038) | (1,823)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 65,325 | 44,108
Fair Value, Inputs, Level 1 [Member] | Other International Common Stock Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 128,095 | 110,775
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 50,839 | 39,837
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (6,924) | (1,831)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 172,010 | 148,781
Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 814,776 | 821,406
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 156,109 | 95,155
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (3,378) | (10,437)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 967,507 | 906,124
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 999,849 | 1,022,409
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 43,524 | 35,872
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (6,119) | (19,298)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 1,037,254 | 1,038,983
Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 187 | 188
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 2 | 2
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | 0 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 189 | 190
Reported Value Measurement [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,673,301 |
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 249,130 |
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (8,949) |
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 1,913,482 |
Reported Value Measurement [Member] | Commingled funds - Fixed inc [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 756,031 | 657,219
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 33,977 | 37,474
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (2,429) | (173)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 787,579 | 694,520
Reported Value Measurement [Member] | Commingled funds - Equity [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 259,790 | 283,329
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 103,912 | 97,704
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (6) | 0
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 363,696 | 381,033
Reported Value Measurement [Member] | Money Market Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 368,461 | 330,745
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 0 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | 0 | 0
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 368,461 | 330,745
Reported Value Measurement [Member] | Private Equity Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 289,019 | 217,953
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 111,241 | 68,846
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (6,514) | (10,284)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 393,746 | 276,515
Reported Value Measurement [Member] | Reported At Net Asset Value [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss |  | 1,489,246
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain |  | 204,024
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss |  | (10,457)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value |  | 1,682,813
Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 5,333,089 | 5,058,921
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 1,082,082 | 891,327
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (87,094) | (99,060)
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | $ 6,328,077 | $ 5,851,188

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