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Investments (Net Realized Gains (Losses) on Invesments, Excluding Other Than Temporary Impairments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses | $ 4,328 | $ (2,196) | $ (67) | $ (40,275)
Fixed Maturity Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 6,164 | 505 | 12,590 | 2,845
Gross realized losses | (1,586) | (1,913) | (5,667) | (43,648)
Realized gains (losses), excluding other than temporary impairment | 4,578 | (1,408) | 6,923 | (40,803)
Other Investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 0 | 0 | 7,296 | 0
Gross realized losses | 0 | 0 | (14,446) | 0
Realized gains (losses), excluding other than temporary impairment | 0 | 0 | (7,150) | 0
Mortgage Loans on Real Estate |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Increase (decrease) in allowance for credit losses | (250) | (1,255) | 160 | (785)
Recovery of specific allowance | 0 | 467 | 0 | 1,189
Gain on sale of mortgage loans | 0 | 0 | 0 | 124
Change in allowance for credit losses and recoveries | $ (250) | $ (788) | $ 160 | $ 528

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