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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |
Net unrealized investment (losses) gains arising during the period | $ 179,174 | $ (707,005) | $ (154,555)
Income tax (expense) benefit | (37,626) | 148,471 | 32,456
Net of taxes | 141,548 | (558,534) | (122,099)
Net changes in benefit plan assets and obligations | 29,978 | (54,017) | 31,613
Income tax benefit (expense) | (6,296) | 11,343 | (6,638)
Net of taxes | 23,682 | (42,674) | 24,975
Total other comprehensive income (loss) | 209,152 | (761,022) | (122,942)
Total income tax benefit (expense) | (43,922) | 159,814 | 25,818
Other comprehensive income (loss), net of tax | $ 165,230 | $ (601,208) | $ (97,124)

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