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Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Investments [Abstract] |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | $ 10,705 | $ 390 | $ 14,055 | $ 20,980
Investment Gains And Losses [Abstract] |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | 0 | 889 | 0 | 889
Gain on investment activity | (20,040) | (19,512) | (52,146) | (91,611)
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | (37,880) | (7,593) | (94,194) | (26,577)
Available-for-sale Equity Securities, Gross Unrealized Gain | 3,932 | 10 | 4,429 | 24
Available-for-sale Equity Securities, Gross Unrealized Loss | (174) | (85) | (1,124) | (4,135)
Gain (Loss) on Sale of Equity Investments | 3,539 | 0 | (7,564) | 0
Other impairment losses and change in mortgage loan provision | (6,566) | (2,446) | (8,235) | (9,220)
Derivatives and other, net | 7,797 | 14,534 | 37,538 | 109,637
Total investment related gains (losses), net | $ (20,017) | $ 22,653 | $ (31,059) | $ 139,471

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- Definition Amount of unrealized gain before deducting unrealized loss on investments in equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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