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Investments - Gains (Losses) Due To Changes In Fair Value Of Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fixed maturity securities |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains (losses) | $ 62,833 | $ (260,223) | $ (39,649)
Equity securities |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains (losses) | 45,046 | (185,694) | 107,701
Short-term investments |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains (losses) | 107 | 88 | (141)
Investments |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains (losses) | $ 107,986 | $ (445,829) | $ 67,911

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