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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2012
SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
Schedule of Derivative Liabilities
    Balance sheet   December 31,  
    location   2011     2012  
Derivative assets and (liabilities)                    
                     
Derivatives not designated as hedging instruments:                    
                     
Foreign exchange forward and options contracts   Other accounts receivable and prepaid expenses   $ -     $ 728  
                     
Foreign exchange forward and options contracts   Accrued expenses and other liabilities   $ (3,163 )   $ -  
Schedule of Change in Provision for Inventory
    December 31,  
    2011     2012  
             
Inventory provision, beginning of year   $ 3,103     $ 4,869  
Increase in inventory provision     211       939  
Increase in inventory provision in connection with Microgil's dispute(*)     1,789       -  
Write off     (205 )     (152 )
Foreign currency translation adjustments     (29 )     151  
                 
Inventory provision, end of year   $ 4,869     $ 5,807  

 

  (*) For further information see Note 12(a)(4).
Schedule of Property, Plant and Equipment Depreciation Rates
      %  
         
Machinery and manufacturing equipment     4-33  
Office equipment and furniture     7-33  
Motor vehicles     10-30  
Buildings     4-5  
Schedule of Changes in Warranty Accrual
    December 31,  
    2011     2012  
             
Warranty provision, beginning of year   $ 1,676     $ 1,978  
Charged to costs and expenses relating to new sales     1,052       1,126  
Acquisition of the business of U.S. Quartz     508       -  
Costs of product warranty claims     (1,109 )     (937 )
Foreign currency translation adjustments     (149 )     56  
                 
Warranty provision, end of year   $ 1,978     $ 2,223  

 
Schedule of Change in Provision for Doubtful Debts
    December 31,  
    2011     2012  
             
Balance at the beginning of the year   $ 331     $ 739  
Charges to expenses     468       601  
Write off     (51 )     (227 )
Foreign currency translation adjustments     (9 )     14  
                 
Balance at end of the year   $ 739     $ 1,127  
Schedule of Liabilities Measured at Fair Value
    December 31, 2011  
    Level 1     Level 2     Level 3     Total  
Derivatives:                                
                                 
Foreign currencies derivatives   $ -     $ (3,163 )   $ -     $ (3,163 )
                                 
Total   $ -     $ (3,163 )   $ -     $ (3,163 )

 

 

 

    December 31, 2012  
    Level 1     Level 2     Level 3     Total  
Derivatives:                                
                                 
Foreign currencies derivatives   $ -     $ 728     $ -     $ 728  
                                 
Total   $ -     $ 728     $ -     $ 728  
Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Assumptions Used to Estimate Fair Value
    2012  
Dividend yield     0 %
Expected volatility     57 %
Risk-free interest rate     0.73 %
Expected life (in years)     4.22