Inventories, Net (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories are summarized as follows:

	June 30, 2018			December 30, 2017
Raw materials	$	42,874		$	39,264
Work-in-process	23,206			24,454
Finished goods	70,136			65,172
Supplies and other	138			143
LIFO reserve	(13,971		)	(15,376		)
Inventories, net	$	122,383		$	113,657