GOODWILL AND INTANGIBLE ASSETS (Details 2) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 28,951	$ 28,779
Finite-Lived Intangible Assets, Accumulated Amortization	(13,658)	(12,976)
Finite-Lived Intangible Assets, Net	15,293	15,803
Other intangible assets, net	26,698	26,730
Technical Know How [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	12,985	12,944
Finite-Lived Intangible Assets, Accumulated Amortization	(7,758)	(7,438)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	9,016	8,981
Finite-Lived Intangible Assets, Accumulated Amortization	(1,976)	(1,744)
Land Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,559	2,498
Finite-Lived Intangible Assets, Accumulated Amortization	(337)	(304)
Patents, trade names, drawings, and other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	4,391	4,356
Finite-Lived Intangible Assets, Accumulated Amortization	(3,587)	(3,490)
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 11,405	$ 10,927