SEGMENT INFORMATION (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 96,663				$ 102,789				$ 96,663	$ 102,789	$ 116,721
Sales	86,960	$ 76,805	$ 82,356	$ 69,128	93,008	$ 68,924	$ 78,851	$ 70,850	315,249	311,633	329,459
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	37,607				39,656				37,607	39,656	49,270
Sales									103,650	94,420	105,764
Other North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	0				0				0	0	0
Sales									4,820	6,474	3,693
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	37,607				39,656				37,607	39,656	49,270
Sales									108,470	100,894	109,457
England
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	555				604				555	604	645
Sales									12,780	13,848	21,090
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	1,388				1,741				1,388	1,741	1,943
Sales									34,830	46,543	40,277
Switzerland
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	30,322				31,524				30,322	31,524	37,055
Sales									7,613	6,834	6,063
Other Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	74				107				74	107	143
Sales									42,046	35,838	32,696
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	32,339				33,976				32,339	33,976	39,786
Sales									97,269	103,063	100,126
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	10,515				11,543				10,515	11,543	12,468
Sales									92,727	88,933	96,532
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	13,453				14,603				13,453	14,603	15,197
Sales									3,772	4,296	4,541
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	2,749				3,011				2,749	3,011	0
Sales									13,011	14,447	18,803
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 26,717				$ 29,157				26,717	29,157	27,665
Sales									$ 109,510	$ 107,676	$ 119,876