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Inventories (Tables)
3 Months Ended
Mar. 29, 2013
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 Inventories are comprised of the following (in thousands):
       
  As of
   March 29,  December 28,
   2013  2012
 Raw materials$ 65,027 $ 58,204
 Work-in-process  32,930   30,022
 Finished goods  20,222   18,386
 Total$ 118,179 $ 106,612