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Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less: loaned securities | $ 148,098 | $ 203,693
Total fixed maturities, available-for-sale, Amortized Cost | 5,648,303 | 5,599,111
Total fixed-maturities available for sale, Fair Value | 5,176,521 | 5,188,228
Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 5,758,323 | 5,734,767
Total fixed maturities, available-for-sale, Amortized Cost | 5,648,303 | 5,599,111
Gross Unrealized Gains | 16,751 | 24,174
Gross Unrealized Losses | (494,833) | (443,531)
Fair Value | 5,280,241 | 5,315,410
Total fixed-maturities available for sale, Fair Value | 5,176,521 | 5,188,228
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 166,275 | 171,194
Gross Unrealized Gains | 0 | 93
Gross Unrealized Losses | (31,581) | (26,891)
Fair Value | 134,694 | 144,396
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 169,734 | 158,539
Gross Unrealized Gains | 87 | 283
Gross Unrealized Losses | (16,850) | (16,037)
Fair Value | 152,971 | 142,785
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 2,804,815 | 2,876,175
Gross Unrealized Gains | 5,287 | 12,286
Gross Unrealized Losses | (297,211) | (259,177)
Fair Value | 2,512,891 | 2,629,284
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 1,157,427 | 1,089,919
Gross Unrealized Gains | 8,153 | 8,250
Gross Unrealized Losses | (104,775) | (84,098)
Fair Value | 1,060,805 | 1,014,071
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 532,968 | 605,029
Gross Unrealized Gains | 33 | 51
Gross Unrealized Losses | (37,386) | (46,697)
Fair Value | 495,615 | 558,383
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 517,651 | 494,339
Gross Unrealized Gains | 310 | 63
Gross Unrealized Losses | (2,622) | (6,553)
Fair Value | 515,339 | 487,849
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 363,736 | 286,988
Gross Unrealized Gains | 843 | 1,608
Gross Unrealized Losses | (4,408) | (4,037)
Fair Value | 360,171 | 284,559
Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total |  | 5,128
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (41)
Fair Value |  | 5,087
Mortgage insurance-linked notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 45,717 | 47,456
Gross Unrealized Gains | 2,038 | 1,540
Gross Unrealized Losses | 0 | 0
Fair Value | 47,755 | 48,996
Loaned securities, amortized cost | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less: loaned securities | 110,020 | 135,656
Loaned securities, fair value | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less: loaned securities | $ 103,720 | $ 127,182

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