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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 827,831 | $ 381,388
Unrealized losses, less than 12 months | (11,156) | (4,567)
Fair value, 12 months or greater | 3,409,088 | 3,981,258
Unrealized losses, 12 months or greater | (483,677) | (438,964)
Fair value, total | 4,236,919 | 4,362,646
Unrealized losses, total | $ (494,833) | $ (443,531)
Number of securities in unrealized loss position | security | 1,037 | 1,063
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 6,009 | $ 15,650
Unrealized losses, less than 12 months | (349) | (938)
Fair value, 12 months or greater | 119,459 | 113,678
Unrealized losses, 12 months or greater | (31,232) | (25,953)
Fair value, total | 125,468 | 129,328
Unrealized losses, total | (31,581) | (26,891)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 28,122 | 17,154
Unrealized losses, less than 12 months | (1,216) | (551)
Fair value, 12 months or greater | 92,942 | 104,949
Unrealized losses, 12 months or greater | (15,634) | (15,486)
Fair value, total | 121,064 | 122,103
Unrealized losses, total | (16,850) | (16,037)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 353,929 | 161,924
Unrealized losses, less than 12 months | (6,424) | (1,261)
Fair value, 12 months or greater | 1,872,436 | 2,055,113
Unrealized losses, 12 months or greater | (290,787) | (257,916)
Fair value, total | 2,226,365 | 2,217,037
Unrealized losses, total | (297,211) | (259,177)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 175,512 | 113,506
Unrealized losses, less than 12 months | (2,249) | (1,439)
Fair value, 12 months or greater | 679,163 | 653,955
Unrealized losses, 12 months or greater | (102,526) | (82,659)
Fair value, total | 854,675 | 767,461
Unrealized losses, total | (104,775) | (84,098)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 13,429 | 8,558
Unrealized losses, less than 12 months | (22) | (31)
Fair value, 12 months or greater | 479,194 | 546,104
Unrealized losses, 12 months or greater | (37,364) | (46,666)
Fair value, total | 492,623 | 554,662
Unrealized losses, total | (37,386) | (46,697)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 113,018 | 15,083
Unrealized losses, less than 12 months | (242) | (25)
Fair value, 12 months or greater | 98,002 | 438,294
Unrealized losses, 12 months or greater | (2,380) | (6,528)
Fair value, total | 211,020 | 453,377
Unrealized losses, total | (2,622) | (6,553)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 137,812 | 49,513
Unrealized losses, less than 12 months | (654) | (322)
Fair value, 12 months or greater | 67,892 | 64,078
Unrealized losses, 12 months or greater | (3,754) | (3,715)
Fair value, total | 205,704 | 113,591
Unrealized losses, total | $ (4,408) | (4,037)
Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months |  | 0
Unrealized losses, less than 12 months |  | 0
Fair value, 12 months or greater |  | 5,087
Unrealized losses, 12 months or greater |  | (41)
Fair value, total |  | 5,087
Unrealized losses, total |  | $ (41)

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