Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 30, 2017
Property, Plant and Equipment [Line Items]
Land and improvements	$ 7,886		$ 7,886
Buildings and improvements	63,226		62,852
Machinery and equipment	189,980		188,971
Assets under construction	1,811		2,443
Property, plant and equipment, gross	262,903		262,152
Accumulated depreciation	(171,381)		(168,367)
Property, plant and equipment, net	91,522		$ 93,785
Depreciation	$ 3,015	$ 3,083