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Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | $ 112,139 | $ 103,996
Total fixed-maturities, available for sale, Amortized Cost | 5,587,261 | 5,367,729
Total fixed-maturities available for sale, Fair Value | 5,017,711 | 5,517,078
Fixed-maturities available for sale | U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 174,138 | 221,407
Gross Unrealized Gains | 206 | 1,719
Gross Unrealized Losses | (28,902) | (1,396)
Fair Value | 145,442 | 221,730
Fixed-maturities available for sale | State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 164,325 | 162,964
Gross Unrealized Gains | 0 | 14,694
Gross Unrealized Losses | (21,939) | (401)
Fair Value | 142,386 | 177,257
Fixed-maturities available for sale | Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,886,905 | 2,867,063
Gross Unrealized Gains | 1,403 | 133,665
Gross Unrealized Losses | (350,537) | (24,886)
Fair Value | 2,537,771 | 2,975,842
Fixed-maturities available for sale | RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,025,795 | 697,581
Gross Unrealized Gains | 1,163 | 14,313
Gross Unrealized Losses | (98,559) | (6,777)
Fair Value | 928,399 | 705,117
Fixed-maturities available for sale | CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 645,890 | 690,827
Gross Unrealized Gains | 13 | 21,444
Gross Unrealized Losses | (52,546) | (3,068)
Fair Value | 593,357 | 709,203
Fixed-maturities available for sale | CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 518,677 | 529,906
Gross Unrealized Gains | 0 | 1,032
Gross Unrealized Losses | (20,485) | (898)
Fair Value | 498,192 | 530,040
Fixed-maturities available for sale | Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 168,033 | 210,657
Gross Unrealized Gains | 69 | 1,142
Gross Unrealized Losses | (6,743) | (612)
Fair Value | 161,359 | 211,187
Fixed-maturities available for sale | Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,118 | 5,109
Gross Unrealized Gains | 0 | 187
Gross Unrealized Losses | (143) | 0
Fair Value | 4,975 | 5,296
Fixed-maturities available for sale | Mortgage insurance-linked notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,578 | 45,384
Gross Unrealized Gains | 80 | 1,633
Gross Unrealized Losses | (1,639) | 0
Fair Value | 53,019 | 47,017
Fixed-maturities available for sale | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,643,459 | 5,430,898
Total fixed-maturities, available for sale, Amortized Cost | 5,587,261 | 5,367,729
Gross Unrealized Gains | 2,934 | 189,829
Gross Unrealized Losses | (581,493) | (38,038)
Fair Value | 5,064,900 | 5,582,689
Total fixed-maturities available for sale, Fair Value | 5,017,711 | 5,517,078
Fixed-maturities available for sale | Loaned securities, amortized cost | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 56,198 | 63,169
Fixed-maturities available for sale | Loaned securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 47,200 |
Fixed-maturities available for sale | Loaned securities | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | $ 47,189 | $ 65,611

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