Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 226,323	$ 166,689	$ 700,889	$ 521,570
Cost of sales	184,781	134,688	568,101	409,631
Gross profit	41,542	32,001	132,788	111,939
Selling, general and administrative expenses	26,594	22,798	81,499	69,283
Operating profit	14,948	9,203	51,289	42,656
Interest expense, net	116	78	246	197
Income before income taxes	14,832	9,125	51,043	42,459
Provision for income taxes	5,061	3,506	18,448	16,488
Net income	$ 9,771	$ 5,619	$ 32,595	$ 25,971
Net income per common share:
Basic	$ 0.43	$ 0.25	$ 1.45	$ 1.17
Diluted	$ 0.43	$ 0.25	$ 1.43	$ 1.16
Weighted average common shares outstanding:
Basic	22,563	22,273	22,507	22,254
Diluted	22,800	22,447	22,724	22,427