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Investments (Changes in Net Unrealized Gains/Losses on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investments [Abstract] |  |  |  |
Fixed maturity securities held for investment carried at amortized cost | $ 0 | $ 2,947 | $ 0 | $ (5,519)
Fixed maturity securities available for sale carried at fair value | 990,481 | (311,954) | 3,891,291 | (2,122,555)
Adjustment for effect on other balance sheet accounts: |  |  |  |
Deferred policy acquisition costs and deferred sales inducements | (245,044) | 172,566 | (1,750,390) | 1,132,853
Deferred income tax asset/liability | (155,992) | 29,270 | (449,040) | 207,837
Total adjustment for effect on other balance sheet accounts | (401,036) | 201,836 | (2,199,430) | 1,340,690
Change in net unrealized gains/losses on investments carried at fair value | $ 589,445 | $ (110,118) | $ 1,691,861 | $ (781,865)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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