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Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less: loaned securities | $ 139,121 | $ 203,693
Total fixed-maturities, available for sale, Amortized Cost | 5,511,501 | 5,599,111
Total fixed-maturities available for sale, Fair Value | 5,074,920 | 5,188,228
Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,648,583 | 5,734,767
Total fixed-maturities, available for sale, Amortized Cost | 5,511,501 | 5,599,111
Gross Unrealized Gains | 16,565 | 24,174
Gross Unrealized Losses | (460,376) | (443,531)
Fair Value | 5,204,772 | 5,315,410
Total fixed-maturities available for sale, Fair Value | 5,074,920 | 5,188,228
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 160,509 | 171,194
Gross Unrealized Gains | 0 | 93
Gross Unrealized Losses | (32,177) | (26,891)
Fair Value | 128,332 | 144,396
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 167,114 | 158,539
Gross Unrealized Gains | 40 | 283
Gross Unrealized Losses | (18,263) | (16,037)
Fair Value | 148,891 | 142,785
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,878,705 | 2,876,175
Gross Unrealized Gains | 5,261 | 12,286
Gross Unrealized Losses | (277,535) | (259,177)
Fair Value | 2,606,431 | 2,629,284
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,104,721 | 1,089,919
Gross Unrealized Gains | 6,965 | 8,250
Gross Unrealized Losses | (100,056) | (84,098)
Fair Value | 1,011,630 | 1,014,071
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 438,139 | 605,029
Gross Unrealized Gains | 51 | 51
Gross Unrealized Losses | (26,191) | (46,697)
Fair Value | 411,999 | 558,383
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 411,328 | 494,339
Gross Unrealized Gains | 983 | 63
Gross Unrealized Losses | (849) | (6,553)
Fair Value | 411,462 | 487,849
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 442,620 | 286,988
Gross Unrealized Gains | 1,556 | 1,608
Gross Unrealized Losses | (5,305) | (4,037)
Fair Value | 438,871 | 284,559
Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 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] |  |
Amortized Cost | 45,447 | 47,456
Gross Unrealized Gains | 1,709 | 1,540
Gross Unrealized Losses | 0 | 0
Fair Value | 47,156 | 48,996
Loaned securities, amortized cost | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less: loaned securities | 137,082 | 135,656
Loaned securities, fair value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less: loaned securities | 130,000 |
Loaned securities, fair value | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less: loaned securities | $ 129,852 | $ 127,182

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