ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
ACCRUED EXPENSES [Abstract]
Sales commissions	$ 2,404		$ 2,066
Subcontracting labor	1,437		1,370
Salaries, bonuses and related benefits	16,522		17,587
Warranty accrual	2,043		2,718
Other	7,410		7,808
Accrued expenses	29,816		$ 31,549
Warranty Accrual Activity Account [Roll Forward]
Beginning balance as of beginning of period	2,718	$ 3,659
Charges and costs accrued	211	142
Adjustments related to pre-existing warranties (including changes in estimates)	(779)	(981)
Less repair costs incurred	(173)	(433)
Currency translation	66	(18)
Ending balance as of end of period	$ 2,043	$ 2,369