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Investment Information - Summary of available for sale securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Available for sale securities: |  |  |
Estimated fair value | $ 21,014,451 | $ 19,732,825 |
Gross Unrealized Gains | 89,234 | 198,691 |
Gross Unrealized Losses | (1,648,287) | (171,544) |
Allowance for Expected Credit Losses | (41,355) | (2,883) |
Cost or Amortized Cost | 22,614,859 | 19,708,561 |
Fixed maturities available for sale, at fair value |  |  |
Available for sale securities: |  |  |
Estimated fair value | 19,682,789 | 17,998,109 |
Gross Unrealized Gains | 88,680 | 198,123 |
Gross Unrealized Losses | (1,646,399) | (170,954) |
Allowance for Expected Credit Losses | (41,355) | (2,883) | $ (2,397)
Cost or Amortized Cost | 21,281,863 | 17,973,823 |
Fixed maturities available for sale, at fair value | Corporate bonds |  |  |
Available for sale securities: |  |  |
Estimated fair value | 8,020,128 | 6,553,333 |
Gross Unrealized Gains | 55,468 | 104,170 |
Gross Unrealized Losses | (781,353) | (69,194) |
Allowance for Expected Credit Losses | (29,950) | (2,037) |
Cost or Amortized Cost | 8,775,963 | 6,520,394 |
Fixed maturities available for sale, at fair value | Mortgage backed securities |  |  |
Available for sale securities: |  |  |
Estimated fair value | 795,391 | 408,477 |
Gross Unrealized Gains | 4,933 | 2,825 |
Gross Unrealized Losses | (86,587) | (5,410) |
Allowance for Expected Credit Losses | 2 | (48) |
Cost or Amortized Cost | 877,043 | 411,110 |
Fixed maturities available for sale, at fair value | Municipal bonds |  |  |
Available for sale securities: |  |  |
Estimated fair value | 419,166 | 404,666 |
Gross Unrealized Gains | 3,149 | 18,724 |
Gross Unrealized Losses | (33,360) | (1,409) |
Allowance for Expected Credit Losses | (100) | (2) | (11)
Cost or Amortized Cost | 449,477 | 387,353 |
Fixed maturities available for sale, at fair value | Commercial mortgage backed securities |  |  |
Available for sale securities: |  |  |
Estimated fair value | 1,047,275 | 1,046,484 |
Gross Unrealized Gains | 608 | 1,740 |
Gross Unrealized Losses | (57,667) | (3,117) |
Allowance for Expected Credit Losses | (3,415) | (6) |
Cost or Amortized Cost | 1,107,749 | 1,047,867 |
Fixed maturities available for sale, at fair value | US government and government agencies |  |  |
Available for sale securities: |  |  |
Estimated fair value | 5,161,193 | 4,772,764 |
Gross Unrealized Gains | 14,891 | 10,076 |
Gross Unrealized Losses | (342,963) | (45,967) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | 5,489,265 | 4,808,655 |
Fixed maturities available for sale, at fair value | Non-US government securities |  |  |
Available for sale securities: |  |  |
Estimated fair value | 2,312,819 | 2,120,294 |
Gross Unrealized Gains | 8,870 | 54,048 |
Gross Unrealized Losses | (237,846) | (34,749) |
Allowance for Expected Credit Losses | (1,882) | (82) | $ 0
Cost or Amortized Cost | 2,543,677 | 2,101,077 |
Fixed maturities available for sale, at fair value | Asset backed securities |  |  |
Available for sale securities: |  |  |
Estimated fair value | 1,926,817 | 2,692,091 |
Gross Unrealized Gains | 761 | 6,540 |
Gross Unrealized Losses | (106,623) | (11,108) |
Allowance for Expected Credit Losses | (6,010) | (708) |
Cost or Amortized Cost | 2,038,689 | 2,697,367 |
Short-term investments |  |  |
Available for sale securities: |  |  |
Estimated fair value | 1,331,662 | 1,734,716 |
Gross Unrealized Gains | 554 | 568 |
Gross Unrealized Losses | (1,888) | (590) |
Allowance for Expected Credit Losses | 0 | 0 |
Cost or Amortized Cost | $ 1,332,996 | $ 1,734,738 |

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