Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Consolidated Statements of Income [Abstract]
Net sales	$ 353,630	$ 374,805
Cost of sales	304,212	319,005
Gross margin	49,418	55,800
Selling, general and administrative expense	32,654	31,642
Research and development expense	3,092	2,410
Other-net	3,788	3,671
Operating profit	9,884	18,077
Interest expense-net	698	585
Income before income taxes	9,186	17,492
Income tax expense	3,068	5,674
Net income	$ 6,118	$ 11,818
Basic earnings per share:
Net income per share of common stock	$ 0.30	$ 0.58
Diluted earnings per share:
Net income per share of common stock	$ 0.30	$ 0.57
Weighted-average number of shares of common stock outstanding
Basic	20,370	20,356
Diluted	20,707	20,796