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Segments, Customers And Geographic Information (Schedule Of Revenues From Sales To Unaffiliated Customers) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reportable segments | 1 us-gaap_NumberOfReportableSegments |  |
Revenues | $ 371,112 us-gaap_Revenues | $ 361,772 us-gaap_Revenues | $ 446,651 us-gaap_Revenues
Long-loved assets | 33,138 us-gaap_NoncurrentAssets | 35,245 us-gaap_NoncurrentAssets | 33,642 us-gaap_NoncurrentAssets
North America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 40,353 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 35,584 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 40,496 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Europe [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 58,537 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 62,914 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 97,133 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Africa [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 55,953 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | 73,735 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | 58,212 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember
Asia-Pacific and Middle East [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 42,095 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | 40,731 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | 70,704 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
India [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 92,066 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_IN | 26,646 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_IN | 54,358 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_IN
Latin America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 82,107 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_LatinAmericaMember | 122,162 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_LatinAmericaMember | 125,748 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_LatinAmericaMember
Israel [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-loved assets | 29,418 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IL | 30,759 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IL | 27,837 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IL
Others [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-loved assets | $ 3,720 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember | $ 4,486 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember | $ 5,805 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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