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Commitments And Contingent Liabilities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Leased Assets [Line Items] |  |  |
Bank guarantees | $ 27,890 us-gaap_GuaranteeObligationsCurrentCarryingValue | $ 36,706 us-gaap_GuaranteeObligationsCurrentCarryingValue |
Indirect tax liabilities | 11,448 crnt_AccruedIndirectTaxesNoncurrent | 16,467 crnt_AccruedIndirectTaxesNoncurrent |
Income from decrease of provision of pre-acquisition indirect tax exposures | 3,027 us-gaap_ProceedsFromIncomeTaxRefunds | 7,657 us-gaap_ProceedsFromIncomeTaxRefunds | 0 us-gaap_ProceedsFromIncomeTaxRefunds
Grants received | 1,760 us-gaap_RevenueFromGrants | 660 us-gaap_RevenueFromGrants |
Facilities [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease expense | 5,426 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_FacilitiesMember | 8,182 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_FacilitiesMember | 8,473 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_FacilitiesMember
Motor Vehicles [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease expense | $ 1,174 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember | $ 1,568 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember | $ 1,404 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember

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- Definition Accrued Indirect Taxes. + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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