Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014
Property, Plant and Equipment [Line Items]
Land and improvements	$ 7,257		$ 7,257		$ 7,327
Buildings and improvements	62,001		62,001		61,557
Machinery and equipment	175,095		175,095		171,586
Property, plant and equipment, gross	244,353		244,353		240,470
Accumulated depreciation	(140,518)		(140,518)		(137,981)
Property, plant and equipment, net	103,835		103,835		$ 102,489
Depreciation	$ 3,516	$ 2,841	$ 7,004	$ 5,683