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Investments (Net Realized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Gain (Loss) on Securities [Line Items]
Increase in allowance for credit losses	$ (4,091)	$ (8,654)
Net realized losses on investments	(94,050)	(27,787)
Fixed Maturity Securities, Available For Sale
Gain (Loss) on Securities [Line Items]
Gross realized gains	15,887	25,988
Gross realized losses	(104,505)	(44,451)
Net credit loss recovery (provision)	512	(829)
Realized gains (losses)	(88,106)	(19,292)
Other Investments
Gain (Loss) on Securities [Line Items]
Gross realized gains	0	1,777
Gross realized losses	0	(432)
Realized gains (losses)	0	1,345
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Increase in allowance for credit losses	(3,468)	(8,654)
Recovery of specific allowance	0	0
Loss on sale of mortgage loans	(2,476)	(1,186)
Gain (loss) on mortgage loans	$ (5,944)	$ (9,840)

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Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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