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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
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)