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Inventories (Tables)
9 Months Ended
Oct. 01, 2016
Inventory Items, Net Of Reserves Alternative [Abstract]  
Inventory, Net of Reserves

Inventories are classified as follows (in thousands):

   October 1, 2016 December 31, 2015
Raw materials $97,351 $88,625
Work in progress  20,078  20,901
Finished goods  185,754  153,889
 Total inventories $303,183 $263,415