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Investments (Net Realized Gains (Losses) on Invesments, Excluding Other Than Temporary Impairments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Gain (Loss) on Securities [Line Items] |  |
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses | $ (563) | $ 302
Fixed Maturity Securities |  |
Gain (Loss) on Securities [Line Items] |  |
Gross realized gains | 1,171 | 1,382
Gross realized losses | (1,794) | (2,102)
Gross realized gains (losses), excluding other than temporary impairment | (623) | (720)
Mortgage Loans on Real Estate |  |
Gain (Loss) on Securities [Line Items] |  |
Decrease in allowance for credit losses | 60 | 300
Recovery of specific allowance | 0 | 722
Change in allowance for credit losses and recoveries | $ 60 | $ 1,022

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