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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fixed maturity securities |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains (losses) | $ 6,566 | $ 62,833 | $ (260,223)
Equity securities |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains (losses) | 8,352 | 45,046 | (185,694)
Short-term investments |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains (losses) | 909 | 107 | 88
Investments |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |
Total gains (losses) | $ 15,827 | $ 107,986 | $ (445,829)

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