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Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Investments [Abstract] |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | $ 0 | $ (3,350) | $ (9,453) | $ (3,350)
Investment Gains And Losses [Abstract] |  |  |  |
Gain on investment activity | (20,384) | (21,140) | (48,429) | (32,106)
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | (6,870) | (35,934) | (25,593) | (56,314)
Available-for-sale Equity Securities, Gross Unrealized Gain | 0 | 469 | 74 | 497
Available-for-sale Equity Securities, Gross Unrealized Loss | 0 | 0 | (1) | (950)
Gain (Loss) on Sale of Equity Investments | 2,673 | (6,966) | 6,417 | (11,103)
Other impairment losses and change in mortgage loan provision | (5,609) | (1,357) | (7,468) | (1,669)
Derivatives and other, net | 1,894 | 15,426 | 7,855 | 29,741
Total investment related gains (losses), net | $ 12,472 | $ (10,572) | $ 20,260 | $ (11,042)

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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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