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Investments - Securities In Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2026 USD ($) security | Dec. 31, 2025 USD ($) security
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 1,550,757 | $ 521,574
12 Months or Greater - Fair Value | 2,032,890 | 2,324,283
Total - Fair Value | 3,583,647 | 2,845,857
Less Than 12 Months - Unrealized Losses | (13,539) | (8,528)
12 Months or Greater - Unrealized Losses | (216,673) | (206,139)
Total - Unrealized Losses | $ (230,212) | $ (214,667)
Number of securities in unrealized loss position (in securities) | security | 996 | 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 | $ 160,992 | $ 15,762
12 Months or Greater - Fair Value | 30,819 | 51,113
Total - Fair Value | 191,811 | 66,875
Less Than 12 Months - Unrealized Losses | (744) | (60)
12 Months or Greater - Unrealized Losses | (2,302) | (2,445)
Total - Unrealized Losses | (3,046) | (2,505)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 200,110 | 144,148
12 Months or Greater - Fair Value | 1,030,622 | 1,087,931
Total - Fair Value | 1,230,732 | 1,232,079
Less Than 12 Months - Unrealized Losses | (3,037) | (6,123)
12 Months or Greater - Unrealized Losses | (136,044) | (127,912)
Total - Unrealized Losses | (139,081) | (134,035)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 810,234 | 258,349
12 Months or Greater - Fair Value | 761,003 | 887,659
Total - Fair Value | 1,571,237 | 1,146,008
Less Than 12 Months - Unrealized Losses | (6,333) | (1,180)
12 Months or Greater - Unrealized Losses | (58,689) | (56,677)
Total - Unrealized Losses | (65,022) | (57,857)
ABS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 172,169 | 49,774
12 Months or Greater - Fair Value | 4,584 | 22,965
Total - Fair Value | 176,753 | 72,739
Less Than 12 Months - Unrealized Losses | (1,575) | (1,103)
12 Months or Greater - Unrealized Losses | (1,238) | (232)
Total - Unrealized Losses | (2,813) | (1,335)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 51,103 | 2,906
12 Months or Greater - Fair Value | 150,115 | 187,553
Total - Fair Value | 201,218 | 190,459
Less Than 12 Months - Unrealized Losses | (351) | (8)
12 Months or Greater - Unrealized Losses | (16,407) | (16,808)
Total - Unrealized Losses | (16,758) | (16,816)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 120,580 | 15,363
12 Months or Greater - Fair Value | 51,690 | 82,994
Total - Fair Value | 172,270 | 98,357
Less Than 12 Months - Unrealized Losses | (1,446) | (30)
12 Months or Greater - Unrealized Losses | (1,562) | (1,645)
Total - Unrealized Losses | (3,008) | (1,675)
CLOs |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 32,231 | 35,272
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 32,231 | 35,272
Less Than 12 Months - Unrealized Losses | (52) | (24)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (52) | (24)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 0 | 0
12 Months or Greater - Fair Value | 4,057 | 4,068
Total - Fair Value | 4,057 | 4,068
Less Than 12 Months - Unrealized Losses | 0 | 0
12 Months or Greater - Unrealized Losses | (431) | (420)
Total - Unrealized Losses | (431) | $ (420)
Commercial paper |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 3,338 |
12 Months or Greater - Fair Value | 0 |
Total - Fair Value | 3,338 |
Less Than 12 Months - Unrealized Losses | (1) |
12 Months or Greater - Unrealized Losses | 0 |
Total - Unrealized Losses | $ (1) |

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