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GENERAL (Narratives) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2015
Aug. 31, 2014
May. 31, 2014
Nov. 30, 2013
Jan. 19, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 28, 2016
Jan. 01, 2016
Oct. 01, 2015
Apr. 01, 2015
General [Line Items]                        
Restructuring expenses           $ 1,225 $ 6,816 $ 9,345        
Maturity date           Mar. 14, 2016            
Line of credit outstanding amount           $ 34,922            
Maximum borrowing capacity under the credit agreement           56,000            
Total proceeds from public offering   $ 45,149   $ 349,590   73,500 45,149 34,959        
Maximum bank guarantees           40,200            
Net income (loss)           1,011 (76,479) (47,478)        
Net cash provided by operating activities           16,121 (32,279) (29,512)        
Line of credit reduction           56,000            
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 reduction                 $ 50,000 $ 4,000 $ 5,000 $ 5,000
Line Of Credit [Member] | Minimum [Member]                        
General [Line Items]                        
Cash covenant amount           20,000         $ 15,000  
Restructuring Plan 2013 [Member]                        
General [Line Items]                        
Restructuring expenses             978 $ 9,345        
Restructuring reserve             501          
Restructuring Plan 2014 [Member]                        
General [Line Items]                        
Restructuring expenses           1,225 5,838          
Restructuring reserve           $ 42 $ 2,427