Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Jul. 02, 2016	Jan. 02, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 642,781	$ 636,191
Accumulated depreciation	(434,381)	(425,613)
Property, plant and equipment, net	208,400	210,578
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,209	9,194
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	82,065	82,206
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	527,632	525,914
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,894	8,696
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,981	$ 10,181