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Investments (Net Realized Gains (Losses) on Invesments, Excluding Other Than Temporary Impairments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses | $ (3,832) | $ (38,381) | $ (4,395) | $ (38,079)
Fixed Maturity Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 5,255 | 958 | 6,426 | 2,340
Gross realized losses | (2,287) | (39,633) | (4,081) | (41,735)
Gross realized gains (losses), excluding other than temporary impairment | 2,968 | (38,675) | 2,345 | (39,395)
Other Investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 7,296 | 0 | 7,296 | 0
Gross realized losses | (14,446) | 0 | (14,446) | 0
Gross realized gains (losses), excluding other than temporary impairment | (7,150) | 0 | (7,150) | 0
Mortgage Loans on Real Estate |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Decrease in allowance for credit losses | 350 | 170 | 410 | 470
Recovery of specific allowance | 0 | 0 | 0 | 722
Gain on sale of mortgage loans | 0 | 124 | 0 | 124
Change in allowance for credit losses and recoveries | $ 350 | $ 294 | $ 410 | $ 1,316

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