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Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,737,089 |
Loaned securities | 89,919 | $ 112,139
Total fixed maturities, available-for-sale, Amortized Cost | 5,685,122 | 5,587,261
Fair Value | 5,200,219 |
Total fixed-maturities available for sale, Fair Value | 5,155,897 | 5,017,711
Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total fixed maturities, available-for-sale, Amortized Cost | 5,685,122 | 5,587,261
Total fixed-maturities available for sale, Fair Value | 5,155,897 | 5,017,711
Loaned securities, amortized cost |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 51,967 |
Loaned securities, fair value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 44,322 |
Fixed-maturities available for sale | U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 171,925 | 174,138
Gross Unrealized Gains | 306 | 206
Gross Unrealized Losses | (26,423) | (28,902)
Fair Value | 145,808 | 145,442
Fixed-maturities available for sale | State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 179,911 | 164,325
Gross Unrealized Gains | 203 | 0
Gross Unrealized Losses | (16,875) | (21,939)
Fair Value | 163,239 | 142,386
Fixed-maturities available for sale | Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,870,466 | 2,886,905
Gross Unrealized Gains | 2,130 | 1,403
Gross Unrealized Losses | (325,497) | (350,537)
Fair Value | 2,547,099 | 2,537,771
Fixed-maturities available for sale | RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,082,114 | 1,025,795
Gross Unrealized Gains | 3,328 | 1,163
Gross Unrealized Losses | (95,185) | (98,559)
Fair Value | 990,257 | 928,399
Fixed-maturities available for sale | CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 632,524 | 645,890
Gross Unrealized Gains | 18 | 13
Gross Unrealized Losses | (58,786) | (52,546)
Fair Value | 573,756 | 593,357
Fixed-maturities available for sale | CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 504,216 | 518,677
Gross Unrealized Gains | 61 | 0
Gross Unrealized Losses | (15,862) | (20,485)
Fair Value | 488,415 | 498,192
Fixed-maturities available for sale | Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 241,398 | 168,033
Gross Unrealized Gains | 143 | 69
Gross Unrealized Losses | (5,623) | (6,743)
Fair Value | 235,918 | 161,359
Fixed-maturities available for sale | Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,123 | 5,118
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (106) | (143)
Fair Value | 5,017 | 4,975
Fixed-maturities available for sale | Mortgage insurance-linked notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,412 | 54,578
Gross Unrealized Gains | 1,298 | 80
Gross Unrealized Losses | 0 | (1,639)
Fair Value | 50,710 | 53,019
Fixed-maturities available for sale | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,737,089 | 5,643,459
Gross Unrealized Gains | 7,487 | 2,934
Gross Unrealized Losses | (544,357) | (581,493)
Fair Value | 5,200,219 | 5,064,900
Fixed-maturities available for sale | Loaned securities, amortized cost | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | 51,967 | 56,198
Fixed-maturities available for sale | Loaned securities, fair value | Total fixed-maturities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loaned securities | $ 44,322 | $ 47,189

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