Investments (Net Realized Losses on Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gain (Loss) on Securities [Line Items]
Decrease (increase) in allowance for credit losses	$ (15,126)	$ 7,005
Recovery of specific allowance	1,677	0
Net realized losses on investments	(47,848)	(13,242)	$ (80,680)
Fixed Maturity Securities, Available For Sale
Gain (Loss) on Securities [Line Items]
Gross realized gains	139,819	10,167	305,170
Gross realized losses	(153,712)	(19,140)	(276,847)
Net credit loss (provision) release	(15,536)	(6,241)	(94,560)
Realized losses	(29,429)	(15,214)	(66,237)
Mortgage loans on real estate
Gain (Loss) on Securities [Line Items]
Decrease (increase) in allowance for credit losses	(15,126)	7,005	(15,447)
Recovery of specific allowance	1,677	0	712
Gain (loss) on sale of mortgage loans	(4,970)	(5,033)	292
Gain (loss) on mortgage loans	$ (18,419)	$ 1,972	$ (14,443)

Debt Securities, Available-for-sale, Net Credit Loss

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Gain (Loss) on Mortgage Loans

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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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Amount of realized gain 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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Amount of realized 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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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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Amount of realized and unrealized gain (loss) on investment.

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Reflects the net positive or negative amount derived from subtracting from net proceeds of sale and the carrying amounts, net of allocated reserves, of financial assets transferred to third parties in transactions that qualify for sales treatment.

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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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