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Investments - Securities In Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less than 12 months | $ 1,568,486 | $ 694,898
12 months or greater | 2,674,209 | 3,664,661
Total | 4,242,695 | 4,359,559
Less than 12 months | (23,848) | (12,254)
12 months or greater | (322,308) | (353,890)
Total | $ (346,156) | $ (366,144)
Number of securities in unrealized loss position | security | 1,020 | 1,021
U.S. government securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | $ 37,017 | $ 26,550
12 months or greater | 69,959 | 98,359
Total | 106,976 | 124,909
Less than 12 months | (437) | (75)
12 months or greater | (4,650) | (6,289)
Total | (5,087) | (6,364)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 409,406 | 275,727
12 months or greater | 1,195,869 | 1,200,533
Total | 1,605,275 | 1,476,260
Less than 12 months | (5,621) | (3,622)
12 months or greater | (187,168) | (186,213)
Total | (192,789) | (189,835)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 852,752 | 270,956
12 months or greater | 1,051,862 | 1,604,021
Total | 1,904,614 | 1,874,977
Less than 12 months | (10,334) | (6,060)
12 months or greater | (102,505) | (122,151)
Total | (112,839) | (128,211)
ABS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 20,090 | 41,549
12 months or greater | 49,640 | 62,611
Total | 69,730 | 104,160
Less than 12 months | (184) | (1,234)
12 months or greater | (1,050) | (2,041)
Total | (1,234) | (3,275)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 171,654 | 44,867
12 months or greater | 151,893 | 176,349
Total | 323,547 | 221,216
Less than 12 months | (5,498) | (872)
12 months or greater | (20,030) | (19,784)
Total | (25,528) | (20,656)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 77,567 | 35,249
12 months or greater | 151,188 | 244,216
Total | 228,755 | 279,465
Less than 12 months | (1,774) | (391)
12 months or greater | (6,216) | (15,361)
Total | (7,990) | (15,752)
CLOs |  |
Schedule of Investments [Line Items] |  |
Less than 12 months |  | 0
12 months or greater |  | 274,729
Total |  | 274,729
Less than 12 months |  | 0
12 months or greater |  | (1,408)
Total |  | (1,408)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 0 | 0
12 months or greater | 3,798 | 3,843
Total | 3,798 | 3,843
Less than 12 months | 0 | 0
12 months or greater | (689) | (643)
Total | $ (689) | $ (643)

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