Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 223,552	$ 168,833
Cost of sales	178,729	130,954
Gross profit	44,823	37,879
Selling, general and administrative expenses	27,450	22,336
Operating profit	17,373	15,543
Interest expense, net	74	58
Income before income taxes	17,299	15,485
Provision for income taxes	6,183	6,098
Net income	$ 11,116	$ 9,387
Net income per common share:
Basic	$ 0.50	$ 0.42
Diluted	$ 0.49	$ 0.42
Weighted average common shares outstanding:
Basic	22,442	22,219
Diluted	22,642	22,377