Consolidated Statements of Income (unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Income [Abstract]
Net sales	$ 309,469	$ 236,094	$ 612,820	$ 411,323
Cost of goods sold	278,837	209,179	548,432	373,807
Gross profit	30,632	26,915	64,388	37,516
Selling, general, and administrative expenses	16,083	14,068	34,232	26,052
Operating income	14,549	12,847	30,156	11,464
Net interest and other (income) expenses		94	(5)	2,797
Income before income taxes	14,549	12,753	30,161	8,667
Provision for income taxes	5,088	4,618	10,046	2,998
Net income	$ 9,461	$ 8,135	$ 20,115	$ 5,669
Net income per common and common equivalent share - basic	$ 0.41	$ 0.35	$ 0.87	$ 0.24
Weighted average common and common equivalent shares - basic	23,264	23,171	23,241	23,165
Net income per common and common equivalent share - diluted	$ 0.40	$ 0.35	$ 0.86	$ 0.24
Weighted average common and common equivalent shares - diluted	23,405	23,334	23,392	23,246
Cash dividends declared per share	$ 0.02	$ 0.02	$ 0.04	$ 0.04