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Inventories
3 Months Ended
Mar. 29, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories on the Consolidated Balance Sheets are summarized as follows:
 
(Thousands)
 
Mar. 29,
2013
 
Dec. 31,
2012
Principally average cost:
 
 
 
 
Raw materials and supplies
 
$
38,689

 
$
42,751

Work in process
 
200,979

 
203,179

Finished goods
 
51,113

 
51,094

Gross inventories
 
290,781

 
297,024

Excess of average cost over LIFO inventory value
 
89,453

 
90,899

Net inventories
 
$
201,328

 
$
206,125