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Inventories (Tables)
3 Months Ended
Apr. 02, 2016
Inventory Items, Net Of Reserves Alternative [Abstract]  
Inventory, Net of Reserves

Inventories are classified as follows (in thousands):

   April 2, 2016 December 31, 2015
Raw materials $92,701 $88,625
Work in progress  21,811  20,901
Finished goods  172,536  153,889
 Total inventories $287,048 $263,415