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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 | $ 155,938 us-gaap_InvestmentsFairValueDisclosure | $ 190,152 us-gaap_InvestmentsFairValueDisclosure
Liabilities: |  |
Foreign currency forward exchange contracts | 2,222 us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure |
Accounted for using hedge accounting |  |
Liabilities: |  |
Foreign currency forward exchange contracts | 981 us-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 | 1,241 us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 355 us-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 | 155,938 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 190,152 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities: |  |
Foreign currency forward exchange contracts | 2,222 us-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 | 981 us-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 | 1,241 us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 355 us-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 |  |

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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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