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Fair Value of Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets:    
Short-term investments $ 190,152us-gaap_InvestmentsFairValueDisclosure $ 181,677us-gaap_InvestmentsFairValueDisclosure
Foreign currency forward exchange contracts not accounted for using hedge accounting   157us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Total assets   181,834us-gaap_AssetsFairValueDisclosure
Liabilities:    
Foreign currency forward exchange contracts not accounted for using hedge accounting 355us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Assets:    
Short-term investments      
Foreign currency forward exchange contracts not accounted for using hedge accounting     
Total assets     
Liabilities:    
Foreign currency forward exchange contracts not accounted for using hedge accounting     
Significant Other Observable Inputs (Level 2) [Member]
   
Assets:    
Short-term investments 190,152us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
181,677us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Foreign currency forward exchange contracts not accounted for using hedge accounting   157us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Total assets   181,834us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Liabilities:    
Foreign currency forward exchange contracts not accounted for using hedge accounting 355us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Significant Unobservable Inputs (Level 3) [Member]
   
Assets:    
Short-term investments      
Foreign currency forward exchange contracts not accounted for using hedge accounting     
Total assets     
Liabilities:    
Foreign currency forward exchange contracts not accounted for using hedge accounting