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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 742,867 | $ 381,388
Unrealized losses, less than 12 months | (11,215) | (4,567)
Fair value, 12 months or greater | 3,504,994 | 3,981,258
Unrealized losses, 12 months or greater | (467,080) | (438,964)
Fair value, total | 4,247,861 | 4,362,646
Unrealized losses, total | $ (478,295) | $ (443,531)
Number of securities in unrealized loss position | security | 1,041 | 1,063
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 21,017 | $ 15,650
Unrealized losses, less than 12 months | (1,915) | (938)
Fair value, 12 months or greater | 107,278 | 113,678
Unrealized losses, 12 months or greater | (28,096) | (25,953)
Fair value, total | 128,295 | 129,328
Unrealized losses, total | (30,011) | (26,891)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 24,066 | 17,154
Unrealized losses, less than 12 months | (720) | (551)
Fair value, 12 months or greater | 99,220 | 104,949
Unrealized losses, 12 months or greater | (14,817) | (15,486)
Fair value, total | 123,286 | 122,103
Unrealized losses, total | (15,537) | (16,037)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 318,330 | 161,924
Unrealized losses, less than 12 months | (4,319) | (1,261)
Fair value, 12 months or greater | 1,942,216 | 2,055,113
Unrealized losses, 12 months or greater | (279,256) | (257,916)
Fair value, total | 2,260,546 | 2,217,037
Unrealized losses, total | (283,575) | (259,177)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 129,902 | 113,506
Unrealized losses, less than 12 months | (3,132) | (1,439)
Fair value, 12 months or greater | 635,067 | 653,955
Unrealized losses, 12 months or greater | (95,227) | (82,659)
Fair value, total | 764,969 | 767,461
Unrealized losses, total | (98,359) | (84,098)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 612 | 8,558
Unrealized losses, less than 12 months | (1) | (31)
Fair value, 12 months or greater | 513,908 | 546,104
Unrealized losses, 12 months or greater | (42,423) | (46,666)
Fair value, total | 514,520 | 554,662
Unrealized losses, total | (42,424) | (46,697)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 164,220 | 15,083
Unrealized losses, less than 12 months | (398) | (25)
Fair value, 12 months or greater | 148,248 | 438,294
Unrealized losses, 12 months or greater | (3,949) | (6,528)
Fair value, total | 312,468 | 453,377
Unrealized losses, total | (4,347) | (6,553)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 84,720 | 49,513
Unrealized losses, less than 12 months | (730) | (322)
Fair value, 12 months or greater | 59,057 | 64,078
Unrealized losses, 12 months or greater | (3,312) | (3,715)
Fair value, total | 143,777 | 113,591
Unrealized losses, total | $ (4,042) | (4,037)
Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months |  | 0
Unrealized losses, less than 12 months |  | 0
Fair value, 12 months or greater |  | 5,087
Unrealized losses, 12 months or greater |  | (41)
Fair value, total |  | 5,087
Unrealized losses, total |  | $ (41)

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