Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 767,301	$ 770,696
Accumulated depreciation	(478,018)	(465,789)
Property, plant and equipment, net	289,283	304,907
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,317	14,507
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	93,801	97,674
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	622,986	635,638
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,501	11,049
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 25,696	$ 11,828