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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) Securities | Mar. 31, 2015 USD ($) | Dec. 31, 2015 Securities
Investments [Abstract] |  |  |
Fixed income securities with call features, percentage | 32.00% |  |
Fixed income securities with call features, currently callable, percentage | 0.20% |  |
Fixed income securities with call features, currently callable, amount | $ 75,100 |  |
Fixed income securities with call features, callable during next 12 months, percentage | 1.20% |  |
Fixed income securities with call features, callable during next 12 months, amount | $ 448,000 |  |
Fixed income securities with call features, not callable until within 6 months of stated maturity, percentage | 71.00% |  |
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations | 97.00% |  | 98.00%
Number of individual securities with unrealized losses | Securities | 730 |  | 1,246
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 67.00% |  | 84.00%
Investment Holdings [Line Items] |  |  |
Scheduled principal repayments, calls and tenders for available for sale securities | $ 581,647 | $ 276,734 |
Fixed Maturity Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Scheduled principal repayments, calls and tenders for available for sale securities | 522,300 | 107,300 |
Available For Sale Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Proceeds from sales of available for sale securities | $ 59,400 | $ 169,400 |

X
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- Definition Represents the percentage of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date). + References No definition available. + Details
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