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Marketable Securities - Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Due within one year, Amortized Cost $ 7,327us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due within one year, Estimated fair value 7,314us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years, Amortized Cost 17,611us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after one year through five years, Estimated fair value 17,771us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years, Amortized Cost 361us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after five years through ten years, Estimated fair value 362us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Total available-for-sale securities, Amortized Cost 25,299us-gaap_AvailableForSaleSecuritiesAmortizedCost 26,096us-gaap_AvailableForSaleSecuritiesAmortizedCost
Total available-for-sale securities, Estimated fair value $ 25,447us-gaap_AvailableForSaleSecurities $ 26,156us-gaap_AvailableForSaleSecurities