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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, 2017
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of reportable segments | item   1  
Revenues $ 332,033 $ 293,641 $ 349,435
Property and equipment 29,870 27,560  
North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 39,498 40,236 45,934
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 45,448 43,457 48,637
Africa [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 12,111 19,872 34,642
Asia-Pacific and Middle East [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 44,983 29,743 31,929
India [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 130,042 80,247 105,990
Latin America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 59,951 80,086 $ 82,303
Israel [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment 25,419 23,162  
Others [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment $ 4,451 $ 4,398