Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Dec. 28, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 183,940	$ 198,966	$ 357,669	$ 382,356
Property, plant and equipment, net	247,649		247,649		$ 255,035
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	41,708	73,583	85,327	138,068
Property, plant and equipment, net	48,118		48,118		55,120
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	142,232	$ 125,383	272,342	$ 244,288
Property, plant and equipment, net	$ 199,531		$ 199,531		$ 199,915