Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Gain (Loss) on Securities [Line Items]
Decrease (increase) in allowance for credit losses	$ (4,716)	$ 5,023	$ (13,309)	$ 9,471
Net realized gains (losses) on investments	(15,860)	4,933	(62,259)	(2,764)
Fixed Maturity Securities, Available For Sale
Gain (Loss) on Securities [Line Items]
Gross realized gains	23,978	1,001	27,950	7,430
Gross realized losses	(33,881)	0	(59,940)	(16,147)
Net credit loss (provision) release	(1,487)	84	(14,341)	(93)
Realized gains (losses)	(11,390)	1,085	(46,331)	(8,810)
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Decrease (increase) in allowance for credit losses	(4,716)	5,023	(13,309)	9,471
Recovery of specific allowance	1,086	0	1,315	0
Loss on sale of mortgage loans	(840)	(1,175)	(3,934)	(3,425)
Gain (loss) on mortgage loans	$ (4,470)	$ 3,848	$ (15,928)	$ 6,046

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 of increase in allowance for credit loss on financing receivable from recovery.

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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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