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Investments (Investment Related Gains (Losses) Net) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities, Available-for-sale [Abstract]      
Other than Temporary Impairment Losses, Investments $ (28,494) $ (42,639) $ (38,805)
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest 0 0 74
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 0 1,202 0
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments (158,870) (37,328) (47,094)
Available-for-sale Securities, Gross Realized Gains 65,211 110,546 145,172
Available-for-sale Equity Securities, Gross Unrealized Gain 4,429 23 9,198
Other Impairment Losses And Change In Mortgage Loan Provision (11,919) (9,497) (11,006)
Derivatives And Other Investments Net (15,324) 152,328 39,527
Available-for-sale Equity Securities, Gross Unrealized Loss (1,937) (4,351) (2,871)
Gain (Loss) on Sale of Equity Investments (23,184) 0 0
Realized Investment Gains (Losses) $ (170,088) $ 167,880 $ 94,195