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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Estimated Fair Value |  |
Estimated Fair Value | $ 19,981,477 | $ 19,732,825
Amortized Cost |  |
Cost or Amortized Cost | 20,650,206 | 19,708,561
Fixed maturities |  |
Estimated Fair Value |  |
Due in one year or less | 313,167 | 300,889
Due after one year through five years | 9,592,143 | 8,355,255
Due after five years through 10 years | 4,107,319 | 4,689,155
Due after 10 years | 476,031 | 505,758
Single maturity date | 14,488,660 | 13,851,057
Estimated Fair Value | 17,648,853 | 17,998,109
Amortized Cost |  |
Due in one year or less | 311,780 | 299,772
Due after one year through five years | 9,884,149 | 8,339,387
Due after five years through 10 years | 4,353,470 | 4,684,393
Due after 10 years | 516,934 | 493,927
Single maturity date | 15,066,333 | 13,817,479
Cost or Amortized Cost | 18,317,693 | 17,973,823
Mortgage backed securities | Fixed maturities |  |
Estimated Fair Value |  |
Securities without single maturity date | 416,138 | 408,477
Estimated Fair Value | 416,138 | 408,477
Amortized Cost |  |
Securities without single maturity date | 443,648 | 411,110
Cost or Amortized Cost | 443,648 | 411,110
Commercial mortgage backed securities | Fixed maturities |  |
Estimated Fair Value |  |
Securities without single maturity date | 1,066,365 | 1,046,484
Estimated Fair Value | 1,066,365 | 1,046,484
Amortized Cost |  |
Securities without single maturity date | 1,081,732 | 1,047,867
Cost or Amortized Cost | 1,081,732 | 1,047,867
Asset backed securities | Fixed maturities |  |
Estimated Fair Value |  |
Securities without single maturity date | 1,677,690 | 2,692,091
Estimated Fair Value | 1,677,690 | 2,692,091
Amortized Cost |  |
Securities without single maturity date | 1,725,980 | 2,697,367
Cost or Amortized Cost | $ 1,725,980 | $ 2,697,367

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