ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
ACCRUED EXPENSES [Abstract]
Sales commissions	$ 2,628	$ 2,609
Subcontracting labor	1,276	1,550
Salaries, bonuses and related benefits	14,918	18,275
Warranty accrual	1,329	1,078
Other	9,941	8,778
Accrued expenses	30,092	$ 32,290
Activity and liability balances related to restructuring costs [Roll Forward]
Liability, beginning balance	0
New charges	1,120
Cash payment and other settlements	(351)
Liability, ending balance	769
Severance Costs [Member]
Activity and liability balances related to restructuring costs [Roll Forward]
Liability, beginning balance	0
New charges	311
Cash payment and other settlements	(244)
Liability, ending balance	67
Other Restructuring Costs [Member]
Activity and liability balances related to restructuring costs [Roll Forward]
Liability, beginning balance	0
New charges	809
Cash payment and other settlements	(107)
Liability, ending balance	702
Facility Closing [Member]
Activity and liability balances related to restructuring costs [Roll Forward]
New charges	$ 900