Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Gain (Loss) on Securities [Line Items]
Decrease (increase) in allowance for credit losses	$ 1,933	$ (2,510)	$ 4,448	$ (4,507)
Recovery of specific allowance	0	712	0	712
Net realized losses on investments	(3,114)	(25,888)	(7,697)	(46,224)
Available For Sale Fixed Maturity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains	4,062	1,215	6,429	15,453
Gross realized losses	(7,951)	(264)	(16,147)	(1,470)
Net credit loss (provision) release	1,260	(25,041)	(177)	(56,412)
Realized gains (losses)	(2,629)	(24,090)	(9,895)	(42,429)
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Decrease (increase) in allowance for credit losses	1,933	(2,510)	4,448	(4,507)
Recovery of specific allowance	0	712	0	712
Loss on sale of mortgage loans	(2,418)	0	(2,250)	0
Gain (loss) on mortgage loans	$ (485)	$ (1,798)	$ 2,198	$ (3,795)

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

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Gain (Loss) on Mortgage Loans

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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 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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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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