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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
A summary of inventories follows (in thousands):

        
 
March 31, 2018
 
December 30, 2017
Finished product
$
176,932

 
$
171,277

Work in process
107,910

 
101,540

Raw material
32,648

 
33,173

Supplies and other
55,631

 
52,193

 
$
373,121

 
$
358,183