Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Gain (Loss) on Securities [Line Items]
Credit losses	$ (816)	$ (31,371)
Decrease (increase) in allowance for credit losses	2,515
Net realized losses on investments	(4,583)	(20,336)
Available For Sale Fixed Maturity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains	2,367	14,238
Gross realized losses	(8,196)	(1,206)
Credit losses	(1,437)	(31,371)
Realized gains (losses)	(7,266)	(18,339)
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Decrease (increase) in allowance for credit losses	2,515	(1,997)
Gain on sale of mortgage loans	168	0
Change in allowance for credit losses and gain on sale of mortgage loans	$ 2,683	$ (1,997)

Financing Receivable, Allowance For Credit Losses, Period (Increase) Decrease, Provision And Recoveries, Total

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Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded.

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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 gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), excluding other-than-temporary impairment (OTTI).

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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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