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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
item
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Significant Accounting Policies [Line Items]        
Income tax benefit realization threshold 50.00%      
Impairment of long-lived assets $ 2,367  
Number of reporting units | item 1      
Warranty expense (income) $ 252 139 133  
Warranty provision 2,460 2,712    
Trade receivables sold 14,306 14,443    
Accrued severance pay 6,825 6,914    
Severance expense $ 1,662 $ 2,130 $ 1,964 $ 2,588
Outstanding options excluded from the calculations of diluted net earnings per share due to their anti-dilutive effect | shares 3,848,290 5,679,468 6,895,891  
Technology and Customer Relations Intangible Assets [Member]        
Significant Accounting Policies [Line Items]        
Intangible assets useful lives 7 years      
Maximum [Member]        
Significant Accounting Policies [Line Items]        
Warranty period 3 years      
Minimum [Member]        
Significant Accounting Policies [Line Items]        
Warranty period 1 year