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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, 2017 | Mar. 31, 2016
Gain (Loss) on Investments [Line Items] |  |
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses | $ 2,338 | $ 2,687
Fixed Maturity Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Gross realized gains | 5,572 | 1,487
Gross realized losses | (3,563) | (1,231)
Gross realized gains (losses), excluding other than temporary impairments | 2,009 | 256
Other Investments [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Gain on sale of real estate | 29 | 131
Loss on sale of real estate | 0 | (92)
Gain (loss) on other investments | 29 | 39
Mortgage Loans on Real Estate [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Decrease (increase) in allowance for credit losses | 300 | (948)
Recovery of specific allowance | 0 | 3,340
Change in allowance for credit losses and recoveries | $ 300 | $ 2,392

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