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Inventories (Tables)
 6 Months Ended
Jun. 29, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories on the Consolidated Balance Sheets are summarized as follows:
 
 
June 29,
 
December 31,
(Thousands)
 
2018
 
2017
Raw materials and supplies
 
$
40,550

 
$
42,958

Work in process
 
176,216

 
187,719

Finished goods
 
41,017

 
34,418

Subtotal
 
$
257,783

 
$
265,095

Less: LIFO reserve balance
 
48,579

 
44,743

Inventories
 
$
209,204

 
$
220,352