Property, Plant, and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 30, 2011	Dec. 31, 2010
Property, Plant and Equipment [Abstract]
Land and improvements	$ 23,324,000	$ 22,865,000
Buildings	61,410,000	57,522,000
Machinery and equipment	181,081,000	169,901,000
Property, plant and equipment, gross	265,815,000	250,288,000
Less accumulated depreciation	(129,548,000)	(106,472,000)
Property plant and equipment before construction in progress	136,267,000	143,816,000
Construction in progress	4,941,000	2,733,000
Property, plant and equipment, net	141,208,000	146,549,000
Property Plant and Equipment Income Statement Disclosures [Abstract]
Depreciation	18,600,000	19,100,000	18,900,000
Capitalized computer software, gross	9,600,000	13,000,000
Capitalized computer software, amortization	$ 3,500,000	$ 3,400,000	$ 2,900,000