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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
ACCRUED EXPENSES [Abstract]      
Sales commissions $ 2,685   $ 2,461
Subcontracting labor 1,542   1,408
Salaries, bonuses and related benefits 19,177   16,531
Warranty accrual 1,104   1,769
Other 8,025   8,339
Accrued expenses 32,533   $ 30,508
Warranty Accrual Activity Account [Roll Forward]      
Balance 1,769 $ 2,718  
Charges and costs accrued 0 211  
Adjustments related to pre-existing warranties (including changes in estimates) (494) (779)  
Less repair costs incurred (181) (173)  
Currency translation 10 66  
Balance $ 1,104 $ 2,043