SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 102,789				$ 116,721				$ 102,789	$ 116,721	$ 101,116
Sales	93,008	68,924	78,851	70,850	103,101	79,784	79,355	67,219	311,633	329,459	334,413
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	39,656				49,270				39,656	49,270	33,564
Sales									94,420	105,764	79,013
Other North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	0				0				0	0	0
Sales									6,474	3,693	4,533
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	39,656				49,270				39,656	49,270	33,564
Sales									100,894	109,457	83,546
England
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	604				645				604	645	739
Sales									13,848	21,090	28,328
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	1,741				1,943				1,741	1,943	267
Sales									46,543	40,277	39,595
Switzerland
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	31,524				37,055				31,524	37,055	38,121
Sales									6,834	6,063	9,622
Other Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	107				143				107	143	10
Sales									35,838	32,696	43,463
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	33,976				39,786				33,976	39,786	39,137
Sales									103,063	100,126	121,008
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	11,543				12,468				11,543	12,468	12,405
Sales									88,933	96,532	102,550
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	14,603				15,197				14,603	15,197	16,010
Sales									4,296	4,541	5,474
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	3,011				0				3,011	0	0
Sales									14,447	18,803	21,835
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	29,157				27,665				29,157	27,665	28,415
Sales									$ 107,676	$ 119,876	$ 129,859