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TAXES ON INCOME (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 22, 2017
Jan. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]            
Amount added (deducted) to unrecognized tax benefits derived from interest and exchange       $ 290 $ 911 $ 36
Accrued interest liability on uncertain tax positions     $ 134 $ 134 $ 1,225  
Tax rate     34.00% 24.00% 25.00% 26.50%
Tax exempt undistributed retained earnings     $ 128,750 $ 128,750    
Income tax liability, contingent upon distribution of previously tax exempt earnings     30,900 $ 30,900    
Corporate statutory tax rate on 2018 and thereafter       23.00%    
Corporate statutory tax rate on 2017       24.00%    
Income tax expense       $ 5,652 $ 1,651 $ 5,297
Foreign [Member] | United States Subsidiary [Member]            
Income Taxes [Line Items]            
Operating loss carry forward amount     $ 5,075 $ 5,075    
Operating loss carryforward limitations of use      
can be carried forward and offset against taxable income up to 20 years
   
Foreign [Member] | United States Subsidiary [Member] | Earliest Tax Year [Member]            
Income Taxes [Line Items]            
Operating loss carry forward expiration date       Dec. 31, 2024    
Foreign [Member] | United States Subsidiary [Member] | Latest Tax Year [Member]            
Income Taxes [Line Items]            
Operating loss carry forward expiration date       Dec. 31, 2027    
Development Area A [Member]            
Income Taxes [Line Items]            
Tax rate   9.00%   7.50%    
Other Area [Member]            
Income Taxes [Line Items]            
Tax rate   16.00%        
Privileged Enterprise Status [Member]            
Income Taxes [Line Items]            
Tax exempt period       2 years    
Privileged Enterprise Status [Member] | Domestic [Member]            
Income Taxes [Line Items]            
Tax benefit, Limitations on Use      
The duration of tax benefits is subject to a limitation of the earlier of 7 to 10 years from the commencement year, or 12 years from the first day of the year of election.
   
Percentage of income required to be derived from export in order to earn available tax benefits       25.00%    
Preferred Enterprise Status [Member] | Development Zone [Member] | 2015 And Thereafter [Member]            
Income Taxes [Line Items]            
Tax rate       9.00%    
Preferred Enterprise Status [Member] | Elsewhere In Israel [Member] | 2015 And Thereafter [Member]            
Income Taxes [Line Items]            
Tax rate       16.00%    
Minimum [Member]            
Income Taxes [Line Items]            
Tax rate 34.00%          
Minimum [Member] | Privileged Enterprise Status [Member]            
Income Taxes [Line Items]            
Tax reduction period       5 years    
Minimum [Member] | Privileged Enterprise Status [Member] | Domestic [Member]            
Income Taxes [Line Items]            
Tax rate       10.00%    
Maximum [Member]            
Income Taxes [Line Items]            
Tax rate 21.00%          
Maximum [Member] | Privileged Enterprise Status [Member]            
Income Taxes [Line Items]            
Tax reduction period       8 years    
Maximum [Member] | Privileged Enterprise Status [Member] | Domestic [Member]            
Income Taxes [Line Items]            
Tax rate       25.00%