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Marketable Securities (Contractual Maturities Of Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Marketable Securities [Abstract]  
Due in one year or less, Amortized Cost $ 74,100us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Due after one through two years, Amortized Cost 65,183us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Total marketable securities, Amortized Cost 139,283us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
Due in one year or less, Fair Value 74,062us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Due after one through two years, Fair Value 65,153us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Total marketable securities, Fair Value $ 139,215us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue