Inventories (Tables)

9 Months Ended

Sep. 27, 2013

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories on the Consolidated Balance Sheets are summarized as follows:

(Thousands)	Sept. 27, 2013		Dec. 31, 2012
Principally average cost:
Raw materials and supplies	$	43,645	$	42,751
Work in process	199,254		203,179
Finished goods	53,386		51,094
Gross inventories	296,285		297,024
Excess of average cost over LIFO inventory value	83,501		90,899
Net inventories	$	212,784	$	206,125