SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) reportable_segment reporting_unit	Dec. 31, 2016 USD ($) reportable_segment	Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements
Number of reportable business segments | reportable_segment	2	2
Restricted Cash
Restricted cash	$ 2,717	$ 2,923
Accounts Receivable
Maturity period of accounts receivable	30 days
Allowance for doubtful accounts	$ 800	800
Goodwill and Intangible Assets
Number of Reporting Units | reporting_unit	2
Accrued Expenses
Compensation related expenses	$ 12,800	8,000
Revenue Recognition
Customer return period for parts and workholding	90 days
Research and Development Costs
Research & development	$ 14,543	$ 13,514	$ 14,140
Derivative [Line Items]
Maximum maturity period of derivative instruments qualifying as cash flow hedges	1 year
Buildings
Property, plant and equipment
Estimated useful life	40 years
Machinery, equipment and fixtures
Property, plant and equipment
Estimated useful life	12 years
Patterns, tools, jigs and furniture and fixtures
Property, plant and equipment
Estimated useful life	10 years
Office and computer equipment | Minimum
Property, plant and equipment
Estimated useful life	3 years
Office and computer equipment | Maximum
Property, plant and equipment
Estimated useful life	5 years
Not Designated as Hedging Instrument | Foreign Exchange Forward
Derivative [Line Items]
Term of derivative contract	1 year