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Inventories (Tables)
6 Months Ended
Jul. 01, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
A summary of inventories follows (in thousands):

        
 
July 1, 2017
 
December 31, 2016
Finished product
$
180,476

 
$
156,542

Work in process
95,750

 
87,284

Raw material
32,998

 
39,859

Supplies and other
50,411

 
47,130

 
$
359,635

 
$
330,815