Inventories (Tables)

3 Months Ended

Mar. 27, 2016

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories

(Dollars in thousands)
	March 27, 2016		December 27, 2015
Raw materials	$	21,337	$	19,148
Work in process	21,037		21,063
Finished goods	21,452		21,558
Inventories	$	63,826	$	61,769