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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) Securities | Mar. 31, 2016 USD ($) | Dec. 31, 2016 Securities
Investments [Abstract] |  |  |
Fixed income securities with call features, percentage | 36.00% |  |
Fixed income securities with call features, currently callable, percentage | 1.40% |  |
Fixed income securities with call features, currently callable, amount | $ 584,900 |  |
Fixed income securities with call features, callable during next 12 months, percentage | 1.80% |  |
Fixed income securities with call features, callable during next 12 months, amount | $ 744,500 |  |
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% |  | 97.00%
Number of individual securities with unrealized losses | Securities | 1,233 |  | 1,514
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 86.00% |  | 86.00%
Investment Holdings [Line Items] |  |  |
Scheduled principal repayments, calls and tenders for available for sale securities | $ 517,301 | $ 581,647 |
Available For Sale Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Proceeds from sales of available for sale securities | 186,500 | 59,400 |
Fixed Maturity Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Scheduled principal repayments, calls and tenders for available for sale securities | $ 330,800 | $ 522,300 |

X
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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 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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