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Investments (Changes in Net Unrealized Gains/Losses on Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment Holdings [Line Items] |  |  |
Fixed maturity securities held for investment carried at amortized cost | $ 0 | $ 581 | $ 7,478
Investments carried at fair value | 3,549,007 | (2,463,693) | 1,149,212
Adjustment for effect on other balance sheet accounts: |  |  |
Deferred policy acquisition costs and deferred sales inducements | (1,586,537) | 1,318,649 | (587,417)
Deferred income tax asset/liability | (412,117) | 240,459 | (177,162)
Total adjustment for effect on other balance sheet accounts | (1,998,654) | 1,559,108 | (764,579)
Change in net unrealized gains/losses on investments carried at fair value | 1,550,353 | (904,585) | 384,633
Fixed Maturity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Investments carried at fair value | 3,549,007 | (2,463,693) | 1,149,691
Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Investments carried at fair value | $ 0 | $ 0 | $ (479)

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- Definition Adjustments for Assumed Changes in Amortization of Deferred Policy Acquisition Costs and Deferred Sales Inducements Due to Net Unrealized Gains and Losses on Available for Sale Fixed Maturity and Equity Securities. + References No definition available. + Details
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- Definition Represents the aggregate of the adjustments for the effect on other balance sheet accounts related to the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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