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Investments (Changes in Net Unrealized Gains/Losses on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Investment Holdings [Line Items] |  |  |  |
Fixed maturity securities held for investment carried at amortized cost | $ 0 | $ (1,445) | $ 0 | $ (8,466)
Investments carried at fair value, fixed maturity securities, available for sale | 1,383,290 | (594,906) | 2,900,810 | (1,810,601)
Adjustment for effect on other balance sheet accounts: |  |  |  |
Deferred policy acquisition costs and deferred sales inducements | (704,445) | 316,964 | (1,505,346) | 960,287
Deferred income tax asset/liability | (142,558) | 58,366 | (293,048) | 178,567
Total adjustment for effect on other balance sheet accounts | (847,003) | 375,330 | (1,798,394) | 1,138,854
Change in net unrealized gains/losses on investments carried at fair value | 536,287 | (219,576) | 1,102,416 | (671,747)
Fixed Maturity Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Investments carried at fair value, fixed maturity securities, available for sale | $ 1,383,290 | $ (594,906) | $ 2,900,810 | $ (1,810,601)

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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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