Inventories (Tables)

3 Months Ended

Mar. 30, 2012

Inventories [Abstract]

Summary of Inventories

(Thousands)	Mar. 30, 2012		Dec. 31, 2011
Principally average cost:
Raw materials and supplies	$	43,553	$	42,969
Work in process		183,323		179,445
Finished goods		54,125		57,645
Gross inventories		281,001		280,059
Excess of average cost over LIFO inventory value		92,029		92,883
Net inventories	$	188,972	$	187,176