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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 380,453 | $ 1,337,438
Unrealized losses, less than 12 months | (5,572) | (30,838)
Fair value, 12 months or greater | 2,416,469 | 2,774,750
Unrealized losses, 12 months or greater | (328,790) | (428,973)
Fair value, total | 2,796,922 | 4,112,188
Unrealized losses, total | (334,362) | (459,811)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 4,695 | 5,770
Unrealized losses, less than 12 months | (466) | (574)
Fair value, 12 months or greater | 100,672 | 107,886
Unrealized losses, 12 months or greater | (27,155) | (31,141)
Fair value, total | 105,367 | 113,656
Unrealized losses, total | (27,621) | (31,715)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 19,551 | 45,539
Unrealized losses, less than 12 months | (468) | (2,399)
Fair value, 12 months or greater | 92,290 | 78,523
Unrealized losses, 12 months or greater | (14,082) | (15,864)
Fair value, total | 111,841 | 124,062
Unrealized losses, total | (14,550) | (18,263)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 175,092 | 748,877
Unrealized losses, less than 12 months | (2,980) | (18,113)
Fair value, 12 months or greater | 1,338,704 | 1,552,535
Unrealized losses, 12 months or greater | (202,530) | (259,422)
Fair value, total | 1,513,796 | 2,301,412
Unrealized losses, total | (205,510) | (277,535)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 78,589 | 296,899
Unrealized losses, less than 12 months | (859) | (6,467)
Fair value, 12 months or greater | 556,563 | 559,513
Unrealized losses, 12 months or greater | (68,149) | (93,587)
Fair value, total | 635,152 | 856,412
Unrealized losses, total | (69,008) | (100,054)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 3,843 | 15,179
Unrealized losses, less than 12 months | (11) | (139)
Fair value, 12 months or greater | 269,460 | 387,559
Unrealized losses, 12 months or greater | (14,978) | (25,951)
Fair value, total | 273,303 | 402,738
Unrealized losses, total | (14,989) | (26,090)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 40,727 | 44,350
Unrealized losses, less than 12 months | (62) | (65)
Fair value, 12 months or greater | 23,565 | 43,542
Unrealized losses, 12 months or greater | (233) | (784)
Fair value, total | 64,292 | 87,892
Unrealized losses, total | (295) | (849)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 57,956 | 180,824
Unrealized losses, less than 12 months | (726) | (3,081)
Fair value, 12 months or greater | 35,215 | 45,192
Unrealized losses, 12 months or greater | (1,663) | (2,224)
Fair value, total | 93,171 | 226,016
Unrealized losses, total | $ (2,389) | $ (5,305)

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