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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses | $ 7,029 | $ 4,328 | $ (3,832) | $ (563) | $ 3,097 | $ (2,196) | $ (38,381) | $ 302 | $ 6,962 | $ (37,178) | $ 10,509
Fixed Maturity Securities |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 21,449 | 12,245 | 18,254
Gross realized losses |  |  |  |  |  |  |  |  | (6,397) | (47,974) | (9,058)
Gross realized gains (losses), excluding other than temporary impairment |  |  |  |  |  |  |  |  | 15,052 | (35,729) | 9,196
Equity Securities |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 0 | 0 | 348
Other Investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 7,296 | 0 | 0
Gross realized losses |  |  |  |  |  |  |  |  | (14,446) | 0 | 0
Gain on sale of real estate |  |  |  |  |  |  |  |  | 0 | 0 | 56
Gross realized gains (losses), excluding other than temporary impairment |  |  |  |  |  |  |  |  | (7,150) | 0 | 56
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Decrease (increase) in allowance for credit losses |  |  |  |  |  |  |  |  | (940) | (3,165) | 278
Recovery of specific allowance |  |  |  |  |  |  |  |  | 0 | 1,592 | 631
Gain on sale of mortgage loans |  |  |  |  |  |  |  |  | 0 | 124 | 0
Change in allowance for credit losses and recoveries |  |  |  |  |  |  |  |  | $ (940) | $ (1,449) | $ 909

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