Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015	Dec. 26, 2015
Property, Plant and Equipment [Line Items]
Land and improvements	$ 7,758		$ 7,758		$ 7,610
Buildings and improvements	61,210		61,210		61,396
Machinery and equipment	174,729		174,729		174,636
Assets under construction	3,728		3,728		2,819
Property, plant and equipment, gross	247,425		247,425		246,461
Accumulated depreciation	(150,826)		(150,826)		(145,315)
Property, plant and equipment, net	96,599		96,599		$ 101,146
Depreciation	$ 3,177	$ 3,516	$ 6,526	$ 7,004