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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 961,400 | $ 1,338,025
Unrealized losses, less than 12 months | (16,486) | (30,838)
Fair value, 12 months or greater | 2,624,693 | 2,781,382
Unrealized losses, 12 months or greater | (381,000) | (429,538)
Fair value, total | 3,586,093 | 4,119,407
Unrealized losses, total | (397,486) | (460,376)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 19,797 | 5,807
Unrealized losses, less than 12 months | (397) | (574)
Fair value, 12 months or greater | 113,454 | 113,783
Unrealized losses, 12 months or greater | (28,093) | (31,603)
Fair value, total | 133,251 | 119,590
Unrealized losses, total | (28,490) | (32,177)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 30,101 | 45,539
Unrealized losses, less than 12 months | (1,126) | (2,399)
Fair value, 12 months or greater | 84,894 | 78,523
Unrealized losses, 12 months or greater | (14,695) | (15,864)
Fair value, total | 114,995 | 124,062
Unrealized losses, total | (15,821) | (18,263)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 496,187 | 749,427
Unrealized losses, less than 12 months | (10,138) | (18,113)
Fair value, 12 months or greater | 1,434,951 | 1,552,535
Unrealized losses, 12 months or greater | (235,365) | (259,422)
Fair value, total | 1,931,138 | 2,301,962
Unrealized losses, total | (245,503) | (277,535)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 135,449 | 296,899
Unrealized losses, less than 12 months | (2,936) | (6,467)
Fair value, 12 months or greater | 557,444 | 559,525
Unrealized losses, 12 months or greater | (79,912) | (93,589)
Fair value, total | 692,893 | 856,424
Unrealized losses, total | (82,848) | (100,056)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 18,806 | 15,179
Unrealized losses, less than 12 months | (103) | (139)
Fair value, 12 months or greater | 369,433 | 388,282
Unrealized losses, 12 months or greater | (20,833) | (26,052)
Fair value, total | 388,239 | 403,461
Unrealized losses, total | (20,936) | (26,191)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 128,603 | 44,350
Unrealized losses, less than 12 months | (267) | (65)
Fair value, 12 months or greater | 29,699 | 43,542
Unrealized losses, 12 months or greater | (450) | (784)
Fair value, total | 158,302 | 87,892
Unrealized losses, total | (717) | (849)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 132,457 | 180,824
Unrealized losses, less than 12 months | (1,519) | (3,081)
Fair value, 12 months or greater | 34,818 | 45,192
Unrealized losses, 12 months or greater | (1,652) | (2,224)
Fair value, total | 167,275 | 226,016
Unrealized losses, total | $ (3,171) | $ (5,305)

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