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Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Assets held by insurance regulatory requirements | $ 12,200 | $ 11,800
Assets held in trust for the benefit of contractual counterparties | 156,900 | 128,400
Fixed income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 6,061,022 | 5,926,785
Gross Unrealized Gains | 28,235 | 5,953
Gross Unrealized Losses | (366,144) | (523,040)
Fixed income, available-for-sale | 5,723,113 | 5,409,698
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 167,995 | 145,581
Gross Unrealized Gains | 51 | 2
Gross Unrealized Losses | (6,364) | (9,683)
Fixed income, available-for-sale | 161,682 | 135,900
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 2,092,754 | 2,400,261
Gross Unrealized Gains | 5,159 | 4,866
Gross Unrealized Losses | (189,835) | (256,073)
Fixed income, available-for-sale | 1,908,078 | 2,149,054
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 2,626,401 | 2,416,475
Gross Unrealized Gains | 17,391 | 1,043
Gross Unrealized Losses | (128,211) | (196,377)
Fixed income, available-for-sale | 2,515,581 | 2,221,141
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 173,256 | 126,723
Gross Unrealized Gains | 1,292 | 5
Gross Unrealized Losses | (3,275) | (6,041)
Fixed income, available-for-sale | 171,273 | 120,687
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 347,132 | 223,743
Gross Unrealized Gains | 4,297 | 10
Gross Unrealized Losses | (20,656) | (25,744)
Fixed income, available-for-sale | 330,773 | 198,009
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 293,204 | 257,785
Gross Unrealized Gains | 5 | 22
Gross Unrealized Losses | (15,752) | (20,591)
Fixed income, available-for-sale | 277,457 | 237,216
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 327,467 | 337,656
Gross Unrealized Gains | 37 | 5
Gross Unrealized Losses | (1,408) | (7,829)
Fixed income, available-for-sale | 326,096 | 329,832
Foreign government debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 4,486 | 4,486
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (643) | (699)
Fixed income, available-for-sale | 3,843 | 3,787
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 28,327 | 14,075
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | 0 | (3)
Fixed income, available-for-sale | $ 28,330 | $ 14,072

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