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Investment Information - Maturity profile of available for sale securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Estimated Fair Value: |  |
Estimated fair value | $ 21,014,451 | $ 19,732,825
Amortized Cost: |  |
Amortized cost | 22,614,859 | 19,708,561
Fixed maturities available for sale, at fair value |  |
Estimated Fair Value: |  |
Due in one year or less | 510,669 | 300,889
Due after one year through five years | 11,014,753 | 8,355,255
Due after five years through 10 years | 3,984,497 | 4,689,155
Due after 10 years | 403,387 | 505,758
Single maturity date | 15,913,306 | 13,851,057
Estimated fair value | 19,682,789 | 17,998,109
Amortized Cost: |  |
Due in one year or less | 536,962 | 299,772
Due after one year through five years | 11,714,427 | 8,339,387
Due after five years through 10 years | 4,527,447 | 4,684,393
Due after 10 years | 479,546 | 493,927
Single maturity date | 17,258,382 | 13,817,479
Amortized cost | 21,281,863 | 17,973,823
Fixed maturities available for sale, at fair value | Mortgage backed securities |  |
Estimated Fair Value: |  |
Securities without single maturity date | 795,391 | 408,477
Estimated fair value | 795,391 | 408,477
Amortized Cost: |  |
Securities without single maturity date | 877,043 | 411,110
Amortized cost | 877,043 | 411,110
Fixed maturities available for sale, at fair value | Commercial mortgage backed securities |  |
Estimated Fair Value: |  |
Securities without single maturity date | 1,047,275 | 1,046,484
Estimated fair value | 1,047,275 | 1,046,484
Amortized Cost: |  |
Securities without single maturity date | 1,107,749 | 1,047,867
Amortized cost | 1,107,749 | 1,047,867
Fixed maturities available for sale, at fair value | Asset backed securities |  |
Estimated Fair Value: |  |
Securities without single maturity date | 1,926,817 | 2,692,091
Estimated fair value | 1,926,817 | 2,692,091
Amortized Cost: |  |
Securities without single maturity date | 2,038,689 | 2,697,367
Amortized cost | $ 2,038,689 | $ 2,697,367

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