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Inventories (Tables)
3 Months Ended
Apr. 01, 2017
Inventory Items, Net Of Reserves Alternative [Abstract]  
Inventory, Net of Reserves

Inventories are classified as follows (in thousands):

   April 1, 2017 December 31, 2016
Raw materials $91,981 $95,430
Work in progress  17,598  16,585
Finished goods  170,397  150,667
 Total inventories $279,976 $262,682