SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Geographic Net Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue by Geography
Net Revenues	$ 111,255	$ 101,625	$ 323,506	$ 287,232
United States of America
Revenue by Geography
Net Revenues	4,775	4,153	13,078	11,372
Hong Kong/China
Revenue by Geography
Net Revenues	59,328	53,324	170,720	146,021
Taiwan
Revenue by Geography
Net Revenues	12,424	12,067	36,220	36,486
Korea
Revenue by Geography
Net Revenues	9,343	11,363	28,527	30,923
Western Europe (excluding Germany)
Revenue by Geography
Net Revenues	12,963	9,850	37,685	30,400
Japan
Revenue by Geography
Net Revenues	4,853	5,208	15,338	15,552
Germany
Revenue by Geography
Net Revenues	2,817	1,939	8,528	5,789
Other
Revenue by Geography
Net Revenues	$ 4,752	$ 3,721	$ 13,410	$ 10,689