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Other Comprehensive Income (Loss) - Pretax Components of Other Comprehensive Income (Loss) and Related Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |
Net unrealized investment (losses) gains arising during the period | $ 11,481 | $ 179,174 | $ (707,005)
Income tax benefit (expense) | (2,411) | (37,626) | 148,471
Net of taxes | 9,070 | 141,548 | (558,534)
Net changes in benefit plan assets and obligations | 24,113 | 29,978 | (54,017)
Income tax benefit (expense) | (5,064) | (6,296) | 11,343
Net of taxes | 19,049 | 23,682 | (42,674)
Total other comprehensive income (loss) | 35,594 | 209,152 | (761,022)
Total income tax benefit (expense) | (7,475) | (43,922) | 159,814
Other comprehensive income (loss), net of tax | $ 28,119 | $ 165,230 | $ (601,208)

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