Property, Plant and Equipment (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 657,840	$ 636,191
Accumulated depreciation	(450,161)	(425,613)
Property, plant and equipment, net	207,679	210,578
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,537	9,194
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	82,440	82,206
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	546,425	525,914
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,553	8,696
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 10,885	$ 10,181