Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 175,656	$ 176,419	$ 533,325	$ 558,775
Property, plant and equipment, net	239,803		239,803		$ 255,035
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	41,935	58,569	127,431	196,637
Property, plant and equipment, net	48,806		48,806		55,120
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	133,721	$ 117,850	405,894	$ 362,138
Property, plant and equipment, net	$ 190,997		$ 190,997		$ 199,915