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Derivative Instruments (Schedule Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain recognized in Statements of Comprehensive income | $ 100 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet | $ 314 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet | $ 208 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Gain (loss) recognized in consolidated statements of operations | (735)us-gaap_DerivativeGainLossOnDerivativeNet | (961)us-gaap_DerivativeGainLossOnDerivativeNet | 1,496 us-gaap_DerivativeGainLossOnDerivativeNet
Foreign Exchange Option And Forward Contract [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain recognized in Statements of Comprehensive income | 100 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = crnt_ForeignExchangeOptionAndForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |
Foreign Exchange Option And Forward Contract [Member] | Operating Expense [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain recognized in Statements of Comprehensive income | (495)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = crnt_ForeignExchangeOptionAndForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 1,189 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = crnt_ForeignExchangeOptionAndForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 72 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = crnt_ForeignExchangeOptionAndForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember
Foreign Exchange Option And Forward Contract [Member] | Financial Expense [Member] | Not Designated As Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain recognized in Statements of Comprehensive income | (240)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = crnt_ForeignExchangeOptionAndForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = crnt_FinancialExpenseMember | (2,150)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = crnt_ForeignExchangeOptionAndForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = crnt_FinancialExpenseMember | 1,424 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = crnt_ForeignExchangeOptionAndForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = crnt_FinancialExpenseMember
Foreign Exchange Forward Contracts [Member] | Not Designated As Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain recognized in Statements of Comprehensive income |  |  |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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