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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses | $ 844 | $ 5,256 | $ 2,737 | $ 2,687 | $ (151) | $ 1,159 | $ 4,324 | $ 4,879 | $ 11,524 | $ 10,211 | $ (4,003)
Fixed Maturity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Available for sale fixed maturity securities: gross realized gains |  |  |  |  |  |  |  |  | 14,132 | 7,230 | 3,273
Available for sale fixed maturity securities: gross realized losses |  |  |  |  |  |  |  |  | (4,036) | (5,787) | (1,006)
Available for sale fixed maturity securities: gross realized gains (losses), excluding other than temporary impairments |  |  |  |  |  |  |  |  | 10,096 | 1,443 | 2,267
Other Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments: gain on sale of real estate |  |  |  |  |  |  |  |  | 884 | 4,194 | 2,454
Other investments: loss on sale of real estate |  |  |  |  |  |  |  |  | (93) | (575) | (231)
Other investments: impairment losses on real estate |  |  |  |  |  |  |  |  | 0 | (1,297) | (2,441)
Gain (loss) on other investments |  |  |  |  |  |  |  |  | 791 | 2,322 | (218)
Mortgage Loans on Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate: decrease (increase) in allowance for credit losses |  |  |  |  |  |  |  |  | (4,846) | 1,018 | (6,052)
Mortgage loans on real estate: recovery of specific allowance |  |  |  |  |  |  |  |  | 5,483 | 5,428 | 0
Mortgage loans on real estate: change in allowance for provision and recoveries |  |  |  |  |  |  |  |  | $ 637 | $ 6,446 | $ (6,052)

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- Definition Financing Receivable, Allowance For Credit Losses, Period (Increase) Decrease, Provision And Recoveries, Total + References No definition available. + Details
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