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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, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of reportable segments | item 1    
Revenues $ 262,881 $ 285,583 $ 343,874
Property and equipment, net 31,748 34,865  
North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 38,165 42,474 41,384
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 44,832 42,439 38,919
Africa [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 23,497 25,614 23,690
Asia-Pacific and Middle East [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 47,677 53,948 47,320
India [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 62,047 49,748 131,201
Latin America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 46,663 71,360 $ 61,360
Israel [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment, net 26,423 29,165  
Others [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment, net $ 5,325 $ 5,700