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Fair Value Option (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Losses due to changes in fair value of investments	$ (100,281)	$ (127,219)	$ (92,593)	$ (549,775)
Investments
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Losses due to changes in fair value of investments	(100,244)	(127,219)	(92,681)	(549,775)
Fixed maturity securities
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Losses due to changes in fair value of investments	(70,855)	(83,257)	(53,915)	(329,458)
Equity Securities
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Losses due to changes in fair value of investments	(29,452)	(45,779)	(38,820)	(220,469)
Short-term investments
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Losses due to changes in fair value of investments	63	1,817	54	152
Financing Receivable
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Losses due to changes in fair value of investments	$ (37)	$ 0	$ 88	$ 0

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- Definition

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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