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Investments - Securities In Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
security
Dec. 31, 2025
USD ($)
security
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value $ 1,430,273 $ 521,574
12 Months or Greater - Fair Value 2,133,253 2,324,283
Total - Fair Value 3,563,526 2,845,857
Less Than 12 Months - Unrealized Losses (13,057) (8,528)
12 Months or Greater - Unrealized Losses (217,667) (206,139)
Total - Unrealized Losses $ (230,724) $ (214,667)
Number of securities in unrealized loss position (in securities) | security 956 712
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value $ 76,203 $ 15,762
12 Months or Greater - Fair Value 42,711 51,113
Total - Fair Value 118,914 66,875
Less Than 12 Months - Unrealized Losses (326) (60)
12 Months or Greater - Unrealized Losses (2,394) (2,445)
Total - Unrealized Losses (2,720) (2,505)
Obligations of U.S. states and political subdivisions    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 222,709 144,148
12 Months or Greater - Fair Value 1,054,706 1,087,931
Total - Fair Value 1,277,415 1,232,079
Less Than 12 Months - Unrealized Losses (4,077) (6,123)
12 Months or Greater - Unrealized Losses (134,244) (127,912)
Total - Unrealized Losses (138,321) (134,035)
Corporate debt securities    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 718,161 258,349
12 Months or Greater - Fair Value 800,140 887,659
Total - Fair Value 1,518,301 1,146,008
Less Than 12 Months - Unrealized Losses (5,659) (1,180)
12 Months or Greater - Unrealized Losses (61,668) (56,677)
Total - Unrealized Losses (67,327) (57,857)
ABS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 150,590 49,774
12 Months or Greater - Fair Value 4,719 22,965
Total - Fair Value 155,309 72,739
Less Than 12 Months - Unrealized Losses (970) (1,103)
12 Months or Greater - Unrealized Losses (1,148) (232)
Total - Unrealized Losses (2,118) (1,335)
RMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 24,711 2,906
12 Months or Greater - Fair Value 155,868 187,553
Total - Fair Value 180,579 190,459
Less Than 12 Months - Unrealized Losses (273) (8)
12 Months or Greater - Unrealized Losses (16,210) (16,808)
Total - Unrealized Losses (16,483) (16,816)
CMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 124,997 15,363
12 Months or Greater - Fair Value 71,050 82,994
Total - Fair Value 196,047 98,357
Less Than 12 Months - Unrealized Losses (1,543) (30)
12 Months or Greater - Unrealized Losses (1,574) (1,645)
Total - Unrealized Losses (3,117) (1,675)
CLOs    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 112,902 35,272
12 Months or Greater - Fair Value 0 0
Total - Fair Value 112,902 35,272
Less Than 12 Months - Unrealized Losses (209) (24)
12 Months or Greater - Unrealized Losses 0 0
Total - Unrealized Losses (209) (24)
Foreign government debt    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 0 0
12 Months or Greater - Fair Value 4,059 4,068
Total - Fair Value 4,059 4,068
Less Than 12 Months - Unrealized Losses 0 0
12 Months or Greater - Unrealized Losses (429) (420)
Total - Unrealized Losses $ (429) $ (420)