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Inventories (Tables)
 6 Months Ended
Jul. 01, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories by major category are as follows (in thousands):
 
 
 
July 1,
2017
 
December 31,
2016
Raw materials
 
$
34,643

 
$
32,696

Work in process
 
10,533

 
12,186

Finished goods
 
65,433

 
57,068

 
 
$
110,609

 
$
101,950