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Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | $ 119,837 | $ 203,693
Total fixed maturities, available-for-sale, Amortized Cost | 5,657,808 | 5,599,111
Total fixed-maturities available for sale, Fair Value | 5,209,025 | 5,188,228
Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 5,774,322 | 5,734,767
Total fixed maturities, available-for-sale, Amortized Cost | 5,657,808 | 5,599,111
Gross Unrealized Gains | 18,967 | 24,174
Gross Unrealized Losses | (478,295) | (443,531)
Fair Value | 5,314,994 | 5,315,410
Total fixed-maturities available for sale, Fair Value | 5,209,025 | 5,188,228
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 167,869 | 171,194
Gross Unrealized Gains | 0 | 93
Gross Unrealized Losses | (30,011) | (26,891)
Fair Value | 137,858 | 144,396
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 172,084 | 158,539
Gross Unrealized Gains | 218 | 283
Gross Unrealized Losses | (15,537) | (16,037)
Fair Value | 156,765 | 142,785
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 2,886,238 | 2,876,175
Gross Unrealized Gains | 7,042 | 12,286
Gross Unrealized Losses | (283,575) | (259,177)
Fair Value | 2,609,705 | 2,629,284
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 1,138,990 | 1,089,919
Gross Unrealized Gains | 8,842 | 8,250
Gross Unrealized Losses | (98,359) | (84,098)
Fair Value | 1,049,473 | 1,014,071
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 565,949 | 605,029
Gross Unrealized Gains | 55 | 51
Gross Unrealized Losses | (42,424) | (46,697)
Fair Value | 523,580 | 558,383
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 475,769 | 494,339
Gross Unrealized Gains | 188 | 63
Gross Unrealized Losses | (4,347) | (6,553)
Fair Value | 471,610 | 487,849
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 321,559 | 286,988
Gross Unrealized Gains | 1,084 | 1,608
Gross Unrealized Losses | (4,042) | (4,037)
Fair Value | 318,601 | 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 | 45,864 | 47,456
Gross Unrealized Gains | 1,538 | 1,540
Gross Unrealized Losses | 0 | 0
Fair Value | 47,402 | 48,996
Loaned securities, amortized cost | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 116,514 | 135,656
Loaned securities, fair value | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | $ 105,969 | $ 127,182

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