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Inventories
 3 Months Ended
Apr. 01, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories by major category are as follows (in thousands):
 
 
 
April 1,
2017
 
December 31,
2016
Raw materials
 
$
33,415

 
$
32,696

Work in process
 
12,159

 
12,186

Finished goods
 
65,536

 
57,068

 
 
$
111,110

 
$
101,950