GOODWILL AND INTANGIBLE ASSETS (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite Lived and Indefinite Lived Intangible Assets and Liabilities by Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 29,110	$ 28,779
Finite-Lived Intangible Assets, Accumulated Amortization	(14,319)	(12,976)
Finite-Lived Intangible Assets, Net	14,791	15,803
Other intangible assets, net	26,386	26,730
Technical Know How [Member]
Finite Lived and Indefinite Lived Intangible Assets and Liabilities by Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	12,997	12,944
Finite-Lived Intangible Assets, Accumulated Amortization	(8,067)	(7,438)
Customer Relationships [Member]
Finite Lived and Indefinite Lived Intangible Assets and Liabilities by Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	9,026	8,981
Finite-Lived Intangible Assets, Accumulated Amortization	(2,204)	(1,744)
Land Rights [Member]
Finite Lived and Indefinite Lived Intangible Assets and Liabilities by Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	2,667	2,498
Finite-Lived Intangible Assets, Accumulated Amortization	(378)	(304)
Patents, trade names, drawings, and other [Member]
Finite Lived and Indefinite Lived Intangible Assets and Liabilities by Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	4,420	4,356
Finite-Lived Intangible Assets, Accumulated Amortization	(3,670)	(3,490)
Trade names [Member]
Finite Lived and Indefinite Lived Intangible Assets and Liabilities by Major Class [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 11,595	$ 10,927