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Investments (Details 6) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Proceeds received from sales of fixed maturities and equity securities |  |  |
Proceeds received, Fixed maturity securities | $ 261,696 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt | $ 298,045 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt | $ 576,708 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Proceeds received, Equity securities | 17,194 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity | 18,643 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity | 6,057 us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Fixed Maturity Securities [Member] |  |  |
Proceeds received from sales of fixed maturities and equity securities |  |  |
Gross gains realized | 13,224 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | 17,177 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | 32,532 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember
Gross losses realized | (6,325)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | (4,945)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | (11,971)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember
Equity Securities [Member] |  |  |
Proceeds received from sales of fixed maturities and equity securities |  |  |
Gross gains realized | 3,206 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 4,368 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 231 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Gross losses realized | $ (482)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | $ (616)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | $ (438)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

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