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Investments (Changes in Net Unrealized Gains on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Investment Holdings [Line Items] |  |  |  |
Fixed maturity securities held for investment carried at amortized cost | $ 2,947 | $ (1,711) | $ (5,519) | $ 6,119
Investments carried at fair value, available for sale | (311,954) | 128,524 | (2,122,555) | 1,008,004
Adjustment for effect on other balance sheet accounts: |  |  |  |
Deferred policy acquisition costs and deferred sales inducements | 172,566 | (52,572) | 1,132,853 | (516,427)
Deferred income tax asset/liability | 29,270 | (26,583) | 207,837 | (172,052)
Total adjustment for effect on other balance sheet accounts | 201,836 | (79,155) | 1,340,690 | (688,479)
Change in net unrealized gains on investments carried at fair value | (110,118) | 49,369 | (781,865) | 319,525
Fixed Maturity Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Investments carried at fair value, available for sale | (311,954) | 128,981 | (2,122,555) | 1,008,483
Equity Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Investments carried at fair value, available for sale | $ 0 | $ (457) | $ 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 This item represents 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition This item represents the tax effects occurring during the period which are related to the net unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax affects would have been charged or credited directly to other comprehensive income or to related components of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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