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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Estimated Fair Value |  |
Estimated Fair Value | $ 19,812,903 | $ 19,732,825
Amortized Cost |  |
Cost or Amortized Cost | 21,043,045 | 19,708,561
Fixed maturities |  |
Estimated Fair Value |  |
Due in one year or less | 412,194 | 300,889
Due after one year through five years | 9,423,547 | 8,355,255
Due after five years through 10 years | 4,070,099 | 4,689,155
Due after 10 years | 350,188 | 505,758
Single maturity date | 14,256,028 | 13,851,057
Estimated Fair Value | 17,585,029 | 17,998,109
Amortized Cost |  |
Due in one year or less | 414,752 | 299,772
Due after one year through five years | 9,927,876 | 8,339,387
Due after five years through 10 years | 4,512,685 | 4,684,393
Due after 10 years | 442,515 | 493,927
Single maturity date | 15,297,828 | 13,817,479
Cost or Amortized Cost | 18,816,372 | 17,973,823
Fixed maturities | Mortgage backed securities |  |
Estimated Fair Value |  |
Securities without single maturity date | 698,168 | 408,477
Estimated Fair Value | 698,168 | 408,477
Amortized Cost |  |
Securities without single maturity date | 749,639 | 411,110
Cost or Amortized Cost | 749,639 | 411,110
Fixed maturities | Commercial mortgage backed securities |  |
Estimated Fair Value |  |
Securities without single maturity date | 1,023,088 | 1,046,484
Estimated Fair Value | 1,023,088 | 1,046,484
Amortized Cost |  |
Securities without single maturity date | 1,067,205 | 1,047,867
Cost or Amortized Cost | 1,067,205 | 1,047,867
Fixed maturities | Asset backed securities |  |
Estimated Fair Value |  |
Securities without single maturity date | 1,607,745 | 2,692,091
Estimated Fair Value | 1,607,745 | 2,692,091
Amortized Cost |  |
Securities without single maturity date | 1,701,700 | 2,697,367
Cost or Amortized Cost | $ 1,701,700 | $ 2,697,367

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