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Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of realized investment gains (losses)      
Net realized investment gains $ 10,917us-gaap_RealizedInvestmentGainsLosses $ 22,245us-gaap_RealizedInvestmentGainsLosses $ 27,298us-gaap_RealizedInvestmentGainsLosses
Fixed maturities [Member]      
Summary of realized investment gains (losses)      
Net realized investment gains 8,150us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 18,480us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember		 23,218us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
Equity Securities [Member]      
Summary of realized investment gains (losses)      
Net realized investment gains 2,793us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 3,765us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 4,080us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Short-term investments and other [Member]      
Summary of realized investment gains (losses)      
Net realized investment gains $ (26)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ShortTermInvestmentsMember		 $ 0us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ShortTermInvestmentsMember		 $ 0us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ShortTermInvestmentsMember