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GENERAL (Narratives) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2016
Aug. 31, 2014
May 31, 2014
Jan. 19, 2011
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 28, 2016
Oct. 01, 2015
Mar. 31, 2013
General [Line Items]                    
Restructuring expenses         $ 1,225 $ 6,816      
Maturity date         Mar. 14, 2016          
Line of credit outstanding amount         $ 17,000 34,922        
Maximum borrowing capacity under the credit agreement         50,200 56,000        
Total proceeds from public offering   $ 45,149         45,149      
Net income (loss)         11,429 1,011 (76,479)      
Net cash provided by operating activities         $ 25,771 16,121 (32,279)      
Cash and cash equivalents and short-term investments           36,318        
Venezuela [Member]                    
General [Line Items]                    
Cash and cash equivalents, short-term bank deposits and short and long-term marketable securities           1,039        
Elteck Asa [Member]                    
General [Line Items]                    
Proceed from previous acquisition, net of associated legal expenses     $ 16,800              
Nera Networks [Member]                    
General [Line Items]                    
Consideration for all shares       $ 57,175            
Line Of Credit [Member]                    
General [Line Items]                    
Maturity date Jun. 30, 2016                  
Line of credit outstanding amount                   $ 73,500
Maximum bank guarantees                   $ 40,200
Line of credit reduction           56,000   $ 50,000    
Line Of Credit [Member] | Maximum [Member]                    
General [Line Items]                    
Cash covenant amount                 $ 20,000  
Line Of Credit [Member] | Minimum [Member]                    
General [Line Items]                    
Cash covenant amount                 $ 15,000  
Restructuring Plan [Member]                    
General [Line Items]                    
Restructuring expenses           1,225 5,838      
Restructuring reserve           $ 42 2,427      
Previous Restructuring Plan [Member]                    
General [Line Items]                    
Restructuring expenses             $ 978