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Summary of Investments (Net Realized Investment Gains and Losses and Proceeds) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Net realized investment gains (losses): |  |
Available-for-sale | $ (637) | $ (30)
Allowance for credit losses | (170) | (59)
Trading Securities | 0 | (2,457)
Equity securities | 25,315 | (90,828)
Mortgage loans allowance for credit losses | 0 | (5)
Real estate | 0 | (28)
Total net realized investment gains (losses) | 24,508 | (93,407)
Debt Securities, Available-for-sale [Line Items] |  |
Proceeds from sale of available-for-sale investments | 99,682 | 11,910
Fixed maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Proceeds from sale of available-for-sale investments | 31,091 | 11,910
Gross realized gains | 1 | 172
Gross realized losses | $ 638 | $ 382

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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82922868-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922897-210455 + Details
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