Inventories (Tables)

3 Months Ended

Mar. 30, 2018

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories on the Consolidated Balance Sheets are summarized as follows:

	March 30,		December 31,
(Thousands)	2018		2017
Raw materials and supplies	$	43,004	$	42,958
Work in process	185,161		187,719
Finished goods	34,543		34,418
Subtotal	$	262,708	$	265,095
Less: LIFO reserve balance	46,265		44,743
Inventories	$	216,443	$	220,352