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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 1,338,025 | $ 381,388
Unrealized losses, less than 12 months | (30,838) | (4,567)
Fair value, 12 months or greater | 2,781,382 | 3,981,258
Unrealized losses, 12 months or greater | (429,538) | (438,964)
Fair value, total | 4,119,407 | 4,362,646
Unrealized losses, total | (460,376) | (443,531)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 5,807 | 15,650
Unrealized losses, less than 12 months | (574) | (938)
Fair value, 12 months or greater | 113,783 | 113,678
Unrealized losses, 12 months or greater | (31,603) | (25,953)
Fair value, total | 119,590 | 129,328
Unrealized losses, total | (32,177) | (26,891)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 45,539 | 17,154
Unrealized losses, less than 12 months | (2,399) | (551)
Fair value, 12 months or greater | 78,523 | 104,949
Unrealized losses, 12 months or greater | (15,864) | (15,486)
Fair value, total | 124,062 | 122,103
Unrealized losses, total | (18,263) | (16,037)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 749,427 | 161,924
Unrealized losses, less than 12 months | (18,113) | (1,261)
Fair value, 12 months or greater | 1,552,535 | 2,055,113
Unrealized losses, 12 months or greater | (259,422) | (257,916)
Fair value, total | 2,301,962 | 2,217,037
Unrealized losses, total | (277,535) | (259,177)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 296,899 | 113,506
Unrealized losses, less than 12 months | (6,467) | (1,439)
Fair value, 12 months or greater | 559,525 | 653,955
Unrealized losses, 12 months or greater | (93,589) | (82,659)
Fair value, total | 856,424 | 767,461
Unrealized losses, total | (100,056) | (84,098)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 15,179 | 8,558
Unrealized losses, less than 12 months | (139) | (31)
Fair value, 12 months or greater | 388,282 | 546,104
Unrealized losses, 12 months or greater | (26,052) | (46,666)
Fair value, total | 403,461 | 554,662
Unrealized losses, total | (26,191) | (46,697)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 44,350 | 15,083
Unrealized losses, less than 12 months | (65) | (25)
Fair value, 12 months or greater | 43,542 | 438,294
Unrealized losses, 12 months or greater | (784) | (6,528)
Fair value, total | 87,892 | 453,377
Unrealized losses, total | (849) | (6,553)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 180,824 | 49,513
Unrealized losses, less than 12 months | (3,081) | (322)
Fair value, 12 months or greater | 45,192 | 64,078
Unrealized losses, 12 months or greater | (2,224) | (3,715)
Fair value, total | 226,016 | 113,591
Unrealized losses, total | $ (5,305) | (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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