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Inventories (Tables)
6 Months Ended
Jul. 04, 2015
Inventory Items, Net Of Reserves Alternative [Abstract]  
Inventory, Net of Reserves

Inventories are classified as follows (in thousands):

   July 4, 2015 December 31, 2014
Raw materials $92,231 $84,952
Work in progress  21,207  16,749
Finished goods  159,494  144,729
 Total inventories $272,932 $246,430