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Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investments [Abstract] |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | $ (8,539) | $ (10,705) | $ (17,992) | $ (14,055)
Investment Gains And Losses [Abstract] |  |  |  |
Gain on investment activity | (67,980) | (20,040) | (116,409) | (52,146)
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | (12,996) | (37,880) | (38,589) | (94,194)
Available-for-sale Equity Securities, Gross Unrealized Gain | 432 | 3,932 | 506 | 4,429
Available-for-sale Equity Securities, Gross Unrealized Loss | 0 | (174) | (1) | (1,124)
Gain (Loss) on Sale of Equity Investments | 3,396 | 3,539 | 9,813 | (7,564)
Other impairment losses and change in mortgage loan provision | (4,030) | (6,566) | (11,498) | (8,235)
Derivatives and other, net | 2,541 | 7,797 | 10,396 | 37,538
Total investment related gains (losses), net | $ 48,784 | $ (20,017) | $ 69,044 | $ (31,059)

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