Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of assets by geographic region
Total Assets	$ 248,096	$ 259,952
United States [Member]
Summary of assets by geographic region
Total Assets	210,781	223,430
Malaysia [Member]
Summary of assets by geographic region
Total Assets	37,280	36,492
Japan [Member]
Summary of assets by geographic region
Total Assets	25	30
Taiwan [Member]
Summary of assets by geographic region
Total Assets	$ 10