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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |
Net unrealized investment (losses) gains arising during the period | $ (707,005) | $ (154,555) | $ 169,135
Income tax benefit (expense) | 148,471 | 32,456 | (35,519)
Net of taxes | (558,534) | (122,099) | 133,616
Net changes in benefit plan assets and obligations | (54,017) | 31,613 | 13,288
Income tax benefit (expense) | 11,343 | (6,638) | (2,791)
Net of taxes | (42,674) | 24,975 | 10,497
Total other comprehensive income (loss) | (761,022) | (122,942) | 182,423
Total income tax benefit (expense) | 159,814 | 25,818 | (38,310)
Other comprehensive income (loss), net of tax | $ (601,208) | $ (97,124) | $ 144,113

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