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Investments - Gains (Losses) Due To Changes In Fair Value Of Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	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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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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