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Investments (Narrative) (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) Securities | Jun. 30, 2016 USD ($) | Dec. 31, 2016 Securities
Investments [Abstract] |  |  |
Fixed income securities with call features, percentage | 37.00% |  |
Fixed income securities with call features, currently callable, percentage | 2.10% |  |
Fixed income securities with call features, currently callable, amount | $ 899,100 |  |
Fixed income securities with call features, callable during next 12 months, percentage | 1.00% |  |
Fixed income securities with call features, callable during next 12 months, amount | $ 409,500 |  |
Fixed income securities with call features, not callable until within 6 months of stated maturity, percentage | 72.00% |  |
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations | 97.00% |  | 97.00%
Number of individual securities with unrealized losses | Securities | 956 |  | 1,514
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 81.00% |  | 86.00%
Investment Holdings [Line Items] |  |  |
Scheduled principal repayments, calls and tenders for available for sale securities | $ 970,752 | $ 1,421,976 |
Available For Sale Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Proceeds from sales of available for sale securities | 376,900 | 186,100 |
Fixed Maturity Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Scheduled principal repayments, calls and tenders for available for sale securities | $ 593,800 | $ 1,200,000 |

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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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- Definition Represents the amount 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) and are callable during the next 12 months. + References No definition available. + Details
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- Definition Represents the percentage of fixed income securities at fair value rated investment grade (NAIC 1 or 2) compared to the entire fixed income security portfolio at fair value. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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