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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)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455 + Details
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