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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
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of reportable segments 1us-gaap_NumberOfReportableSegments    
Revenues $ 371,112us-gaap_Revenues $ 361,772us-gaap_Revenues $ 446,651us-gaap_Revenues
Long-loved assets 33,138us-gaap_NoncurrentAssets 35,245us-gaap_NoncurrentAssets 33,642us-gaap_NoncurrentAssets
North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 40,353us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
35,584us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
40,496us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 58,537us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
62,914us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
97,133us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Africa [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 55,953us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember
73,735us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember
58,212us-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 42,095us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
40,731us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
70,704us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
India [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 92,066us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_IN
26,646us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_IN
54,358us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_IN
Latin America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 82,107us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
122,162us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
125,748us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
Israel [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-loved assets 29,418us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_IL
30,759us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_IL
27,837us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_IL
Others [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-loved assets $ 3,720us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember
$ 4,486us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember
$ 5,805us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember