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INTANGIBLE ASSETS, NET (Schedule Of Intangible Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Original amount $ 19,569 $ 17,370  
Accumulated amortization 17,370 15,826  
Intangible assets, net 2,199 1,544  
Amortization expense 1,544 1,648 $ 1,865
Intangible assets acquired 1,407
Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original amount 9,825 8,600  
Accumulated amortization 8,600 7,314  
Intangible assets acquired 1,225    
Intangible assets acquired, not resulted in cash flows $ 725    
Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 2 years    
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original amount $ 7,970 7,970  
Accumulated amortization 7,970 7,712  
Software development costs [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original amount $ 974