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Inventories (Tables)
 6 Months Ended
Jul. 01, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in thousands):
 
July 1,
2017
 
December 31,
2016
Raw materials
$
5,740

 
$
7,973

Work in progress
95

 
72

Finished goods
64,021

 
66,981

 
$
69,856

 
$
75,026