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Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) (Corporate Debt Securities [Member], Available-for-sale Securities [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 6,000us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 22,537us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 30,599us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember