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Fair Value Measurement (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Assets:    
Short-term investments $ 155,938us-gaap_InvestmentsFairValueDisclosure $ 190,152us-gaap_InvestmentsFairValueDisclosure
Liabilities:    
Foreign currency forward exchange contracts 2,222us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure  
Accounted for using hedge accounting
    
Liabilities:    
Foreign currency forward exchange contracts 981us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Not accounted for using hedge accounting
    
Liabilities:    
Foreign currency forward exchange contracts 1,241us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 355us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets:    
Short-term investments      
Liabilities:    
Foreign currency forward exchange contracts     
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Accounted for using hedge accounting
    
Liabilities:    
Foreign currency forward exchange contracts     
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Not accounted for using hedge accounting
    
Liabilities:    
Foreign currency forward exchange contracts      
Significant Other Observable Inputs (Level 2) [Member]
    
Assets:    
Short-term investments 155,938us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 190,152us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Liabilities:    
Foreign currency forward exchange contracts 2,222us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Significant Other Observable Inputs (Level 2) [Member] | Accounted for using hedge accounting
    
Liabilities:    
Foreign currency forward exchange contracts 981us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Significant Other Observable Inputs (Level 2) [Member] | Not accounted for using hedge accounting
    
Liabilities:    
Foreign currency forward exchange contracts 1,241us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 355us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Significant Unobservable Inputs (Level 3) [Member]
    
Assets:    
Short-term investments      
Liabilities:    
Foreign currency forward exchange contracts     
Significant Unobservable Inputs (Level 3) [Member] | Accounted for using hedge accounting
    
Liabilities:    
Foreign currency forward exchange contracts     
Significant Unobservable Inputs (Level 3) [Member] | Not accounted for using hedge accounting
    
Liabilities:    
Foreign currency forward exchange contracts