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Segments (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financial information relating to long lived assets by geographic area
Long-lived assets	$ 93,725	$ 84,860	$ 78,213
United States [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	45,957	30,363	28,838
China [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	34,615	34,904	34,832
United Kingdom [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	2,669	7,153	5,028
Singapore [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	1,111	3,877	3,630
Canada [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	563	605	948
Taiwan [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	1,764	2,105	2,339
Thailand [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	5,839	3,625	2,219
Switzerland [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	714	1,721
Other non-U.S. [Member]
Financial information relating to long lived assets by geographic area
Long-lived assets	$ 493	$ 507	$ 379

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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