Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Land and improvements	$ 7,789		$ 7,789		$ 7,781
Buildings and improvements	61,913		61,913		62,055
Machinery and equipment	177,681		177,681		177,745
Assets under construction	8,282		8,282		2,386
Property, plant and equipment, gross	255,665		255,665		249,967
Accumulated depreciation	(162,537)		(162,537)		(157,160)
Property, plant and equipment, net	93,128		93,128		$ 92,807
Depreciation	$ 3,068	$ 3,177	$ 6,150	$ 6,526