Property, Plant and Equipment (Schedule of Property, Plant, and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 762,248	$ 770,696
Accumulated depreciation	(479,840)	(465,789)
Property, plant and equipment, net	282,408	304,907
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,982	14,507
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	101,407	97,674
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	623,619	635,638
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,086	11,049
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 13,154	$ 11,828