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Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | $ 5,926,785 | $ 6,397,658
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 5,409,698 | 6,587,581
Assets held by insurance regulatory requirements | 11,800 | 13,400
Assets held in trust for the benefit of contractual counterparties | 128,400 | 189,800
Collateral pledged for FHLB advance |  | 167,200
Fixed income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 5,926,785 | 6,397,658
Gross Unrealized Gains | 5,953 | 218,390
Gross Unrealized Losses | (523,040) | (28,467)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 5,409,698 | 6,587,581
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 145,581 | 133,990
Gross Unrealized Gains | 2 | 285
Gross Unrealized Losses | (9,683) | (868)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 135,900 | 133,407
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 2,400,261 | 2,408,688
Gross Unrealized Gains | 4,866 | 133,361
Gross Unrealized Losses | (256,073) | (7,396)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 2,149,054 | 2,534,653
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 2,416,475 | 2,704,586
Gross Unrealized Gains | 1,043 | 75,172
Gross Unrealized Losses | (196,377) | (13,776)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 2,221,141 | 2,765,982
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 126,723 | 150,888
Gross Unrealized Gains | 5 | 830
Gross Unrealized Losses | (6,041) | (1,008)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 120,687 | 150,710
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 223,743 | 309,991
Gross Unrealized Gains | 10 | 2,397
Gross Unrealized Losses | (25,744) | (3,278)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 198,009 | 309,110
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 257,785 | 315,330
Gross Unrealized Gains | 22 | 5,736
Gross Unrealized Losses | (20,591) | (1,936)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 237,216 | 319,130
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 337,656 | 360,436
Gross Unrealized Gains | 5 | 609
Gross Unrealized Losses | (7,829) | (106)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 329,832 | 360,939
Foreign government debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 4,486 | 13,749
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (699) | (99)
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | 3,787 | $ 13,650
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 14,075 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (3) |
Fixed income, available-for-sale, at fair value (amortized cost, 2022 - $5,926,785; 2021 - $6,397,658) | $ 14,072 |

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