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Inventories (Tables)
9 Months Ended
Sep. 28, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory

A summary of inventories follows (in thousands):

        
 
September 28, 2019
 
December 29, 2018
Finished product
$
199,764

 
$
176,184

Work in process
80,313

 
78,501

Raw material
35,852

 
32,502

Supplies and other
37,074

 
53,841

 
$
353,003

 
$
341,028