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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, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of reportable segments | item 1    
Revenues $ 293,641 $ 349,435 $ 371,112
Long-lived assets 27,560 28,906 33,138
North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 40,236 45,934 40,353
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 43,457 48,637 58,537
Africa [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 19,872 34,642 55,954
Asia-Pacific and Middle East [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 29,743 31,929 42,095
India [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 80,247 105,990 92,066
Latin America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 80,086 82,303 82,107
Israel [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 23,162 26,127 29,418
Others [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 4,398 $ 2,779 $ 3,720