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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
A summary of inventories follows (in thousands):

        
 
June 30, 2018
 
December 30, 2017
Finished product
$
186,828

 
$
171,277

Work in process
97,172

 
101,540

Raw material
34,520

 
33,173

Supplies and other
52,035

 
52,193

 
$
370,555

 
$
358,183