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Inventories, net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 23,767 $ 19,597
Work-in-process 15,177 9,708
Finished products 18,387 17,489
Balance, end of the period $ 57,331 $ 46,794 [1]
[1] The balance sheet as of December 31, 2012 has been derived from the audited financial statements at that date.