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SEGMENTS, CUSTOMERS AND GEOGRAPHIC INFORMATION (Schedule Of Revenues From Sales To Unaffiliated Customers) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of reportable segments | item 1    
Revenues $ 285,583 $ 343,874 $ 332,033
Property and equipment 34,865 33,613  
North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 42,474 41,384 39,498
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 42,439 38,919 45,448
Africa [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 25,614 23,690 12,111
Asia-Pacific and Middle East [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 53,948 47,320 44,983
India [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 49,748 131,201 130,042
Latin America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 71,360 61,360 $ 59,951
Israel [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment 29,165 28,494  
Others [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment $ 5,700 $ 5,119