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Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Investment Gains And Losses [Abstract] |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | $ 390 | $ 0 | $ 20,980 | $ 34,663
Impairment Losses On Equity Securities | (889) | 0 | (889) | 0
Gain on investment activity | (19,522) | (46,346) | (91,635) | (127,153)
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | (7,678) | (9,054) | (30,712) | (43,397)
Other impairment losses and change in mortgage loan provision | (2,446) | (262) | (9,220) | (2,111)
Derivatives and other, net | 14,534 | 49,594 | 109,637 | 37,020
Total investment related gains (losses), net | $ 22,653 | $ 86,624 | $ 139,471 | $ 84,002

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of loss realized on the sale of debt or equity securities classified as available-for-sale. Excludes other than temporary impairments (OTTI). + References No definition available. + Details
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