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Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income, available-for-sale | $ 5,851,689 | $ 5,723,113
Assets held by insurance regulatory requirements | 12,200 | 12,200
Assets held in trust for the benefit of contractual counterparties | 199,900 | 156,900
Fixed income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 6,178,123 | 6,061,022
Gross Unrealized Gains | 19,722 | 28,235
Gross Unrealized Losses | (346,156) | (366,144)
Fixed income, available-for-sale | 5,851,689 | 5,723,113
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 265,349 | 167,995
Gross Unrealized Gains | 231 | 51
Gross Unrealized Losses | (5,087) | (6,364)
Fixed income, available-for-sale | 260,493 | 161,682
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 2,065,953 | 2,092,754
Gross Unrealized Gains | 2,331 | 5,159
Gross Unrealized Losses | (192,789) | (189,835)
Fixed income, available-for-sale | 1,875,495 | 1,908,078
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 2,857,627 | 2,626,401
Gross Unrealized Gains | 12,593 | 17,391
Gross Unrealized Losses | (112,839) | (128,211)
Fixed income, available-for-sale | 2,757,381 | 2,515,581
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 155,594 | 173,256
Gross Unrealized Gains | 2,157 | 1,292
Gross Unrealized Losses | (1,234) | (3,275)
Fixed income, available-for-sale | 156,517 | 171,273
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 373,485 | 347,132
Gross Unrealized Gains | 2,103 | 4,297
Gross Unrealized Losses | (25,528) | (20,656)
Fixed income, available-for-sale | 350,060 | 330,773
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 243,840 | 293,204
Gross Unrealized Gains | 21 | 5
Gross Unrealized Losses | (7,990) | (15,752)
Fixed income, available-for-sale | 235,871 | 277,457
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 199,773 | 327,467
Gross Unrealized Gains | 286 | 37
Gross Unrealized Losses | 0 | (1,408)
Fixed income, available-for-sale | 200,059 | 326,096
Foreign government debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 4,487 | 4,486
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (689) | (643)
Fixed income, available-for-sale | 3,798 | 3,843
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total at end of period | 12,015 | 28,327
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | 0 | 0
Fixed income, available-for-sale | $ 12,015 | $ 28,330

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