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Inventories, net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 29, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Raw materials $ 21,273 $ 17,373
Work-in-process 13,969 12,404
Finished products 12,504 11,508
Balance, end of period $ 47,746 $ 41,285 [1]
[1] The Balance Sheet as of December 31, 2011 has been derived from the audited financial statements at that date.