Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of assets by geographic region
Total Assets	$ 233,952	$ 248,096
United States [Member]
Summary of assets by geographic region
Total Assets	196,821	210,781
Malaysia [Member]
Summary of assets by geographic region
Total Assets	37,099	37,280
Other [Member]
Summary of assets by geographic region
Total Assets	$ 32	$ 35