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Investments (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of realized investment gains (losses) |  |  |
Net realized investment gains | $ 22,245 | $ 27,298 | $ 37,663
Fixed maturities [Member] |  |  |
Summary of realized investment gains (losses) |  |  |
Net realized investment gains | 18,480 | 23,218 | 37,466
Equity Securities [Member] |  |  |
Summary of realized investment gains (losses) |  |  |
Net realized investment gains | 3,765 | 4,080 | 197
Short-term and other investments [Member] |  |  |
Summary of realized investment gains (losses) |  |  |
Net realized investment gains | $ 0 | $ 0 | $ 0

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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 + Details
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