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Investments (Net Realized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Gain (Loss) on Securities [Line Items]
Increase in allowance for credit losses	$ (8,654)	$ (5,245)
Net realized losses on investments	(27,787)	(13,127)	[1]
Fixed Maturity Securities, Available For Sale
Gain (Loss) on Securities [Line Items]
Gross realized gains	25,988	3,465
Gross realized losses	(44,451)	(2,006)
Net credit loss (provision) release	(829)	(7,356)
Realized gains (losses)	(19,292)	(5,897)
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Increase in allowance for credit losses	(8,654)	(5,245)
Recovery of specific allowance	0	0
Loss on sale of mortgage loans	(1,186)	(1,985)
Gain (loss) on mortgage loans	(9,840)	(7,230)
Other investments
Gain (Loss) on Securities [Line Items]
Gross realized gains	1,777	0
Gross realized losses	(432)	0
Other investments, realized gain (loss)	$ 1,345	$ 0
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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