Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Dec. 27, 2014
Property, Plant and Equipment [Line Items]
Land and improvements	$ 7,385		$ 7,385		$ 7,327
Buildings and improvements	62,504		62,504		61,557
Machinery and equipment	175,328		175,328		171,586
Property, plant and equipment, gross	245,217		245,217		240,470
Accumulated depreciation	(143,148)		(143,148)		(137,981)
Property, plant and equipment, net	102,069		102,069		$ 102,489
Depreciation	$ 3,503	$ 2,921	$ 10,508	$ 8,604