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Investments - Scheduled Maturities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Due in one year or less $ 19,617us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost $ 6,110us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Amortized Cost, Due after one through five years 180,613us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost 195,492us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Amortized Cost, Due after five through ten years 79,706us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost 54,360us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Amortized Cost, Due after ten years 16,802us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost 25,316us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Amortized Cost, Total Investments 365,674us-gaap_AvailableForSaleSecuritiesAmortizedCost 337,718us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]    
Fair Value, Due in one year or less 19,662us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue 6,125us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Fair Value, Due after one through five years 181,103us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue 194,472us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Fair Value, Due after five through ten years 81,044us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue 53,891us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Fair Value Due after ten years 16,907us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue 25,605us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Fair Value, Total Investments 367,947us-gaap_AvailableForSaleSecurities 336,501us-gaap_AvailableForSaleSecurities
Asset-backed securities    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Total Investments 68,936us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
56,440us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract]    
Fair Value, Total Investments $ 69,231us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
$ 56,408us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember