Property, Plant, and Equipment (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Depreciation	$ 36,300,000	$ 34,100,000	$ 38,600,000
Property, plant and equipment, gross	806,906,000	777,569,000	768,115,000
Less: accumulated depreciation	539,505,000	537,079,000	538,388,000
Property, plant and equipment	267,401,000	240,490,000	229,727,000
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,465,000	26,681,000	23,197,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	284,484,000	268,003,000	264,081,000
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	470,748,000	465,014,000	468,926,000
Construction and Equipment Installation in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 24,209,000	$ 17,871,000	$ 11,911,000