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Investments (Net Unrealized Gains (Losses) on Investments Reported as a Separate Component of Stockholders' Equity) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Investments [Abstract] |  |
Net unrealized losses on investments | $ (3,963,901) | $ (3,755,689)
Deferred income tax valuation allowance reversal | 22,534 | 22,534
Deferred income tax expense | 831,961 | 788,236
Net unrealized losses reported as accumulated other comprehensive loss | $ (3,109,406) | $ (2,944,919)

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- Definition The tax effect on the accumulated unrealized gain or loss on the total available for sale security portfolio at the reporting date. + References No definition available. + Details
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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-2 + Details
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- Definition Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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