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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses | $ 3,097 | $ (2,196) | $ (38,381) | $ 302 | $ 2,719 | $ 1,579 | $ 3,873 | $ 2,338 | $ (37,178) | $ 10,509 | $ 11,524
Fixed Maturity Securities |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 12,245 | 18,254 | 14,132
Gross realized losses |  |  |  |  |  |  |  |  | (47,974) | (9,058) | (4,036)
Available for sale fixed maturity securities: Realized gains (losses), excluding other than temporary impairment |  |  |  |  |  |  |  |  | (35,729) | 9,196 | 10,096
Equity Securities |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 0 | 348 | 0
Other Investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate |  |  |  |  |  |  |  |  | 0 | 56 | 884
Loss on sale of real estate |  |  |  |  |  |  |  |  | 0 | 0 | (93)
Other investments: Gain (loss) on other investments |  |  |  |  |  |  |  |  | 0 | 56 | 791
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Decrease (increase) in allowance for credit losses |  |  |  |  |  |  |  |  | (3,165) | 278 | (4,846)
Recovery of specific allowance |  |  |  |  |  |  |  |  | 1,592 | 631 | 5,483
Gain on sale of mortgage loans |  |  |  |  |  |  |  |  | 124 | 0 | 0
Change in allowance for credit losses and recoveries |  |  |  |  |  |  |  |  | $ (1,449) | $ 909 | $ 637

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