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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available for Sale Amortized Cost    
Due in one year or less $ 171,429us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through five years 888,464us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five years through ten years 556,948us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 430,094us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Total 2,609,253us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 3,079,002us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis [1]
Available for Sale Securities Fair Value    
Due in one year or less 173,444us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years 938,289us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years 606,353us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 498,078us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total 2,800,593us-gaap_AvailableForSaleSecuritiesDebtSecurities 3,264,216us-gaap_AvailableForSaleSecuritiesDebtSecurities [1]
Residential Mortgage Backed Securities [Member]    
Available for Sale Amortized Cost    
Debt Maturities, without single maturity date 126,126us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Available for Sale Securities Fair Value    
Debt Maturities, without Single Maturity Date 133,233us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Commercial Mortgage Backed Securities [Member]    
Available for Sale Amortized Cost    
Debt Maturities, without single maturity date 291,868us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Available for Sale Securities Fair Value    
Debt Maturities, without Single Maturity Date 302,185us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Asset-backed Securities [Member]    
Available for Sale Amortized Cost    
Debt Maturities, without single maturity date 144,324us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		  
Available for Sale Securities Fair Value    
Debt Maturities, without Single Maturity Date $ 149,011us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		  
[1] Prior period’s amounts are presented on a basis consistent with the current period presentation.