Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 166,689	$ 146,833	$ 521,570	$ 466,552
Cost of sales	134,688	114,965	409,631	363,467
Gross profit	32,001	31,868	111,939	103,085
Selling, general and administrative expenses	22,877	19,248	69,362	62,337
Other (income)	(79)	(79)	(79)	(79)
Operating profit	9,203	12,699	42,656	40,827
Interest expense, net	78	28	197	168
Income before income taxes	9,125	12,671	42,459	40,659
Provision for income taxes	3,506	4,689	16,488	15,757
Net income	$ 5,619	$ 7,982	$ 25,971	$ 24,902
Net income per common share:
Basic	$ 0.25	$ 0.36	$ 1.17	$ 1.13
Diluted	$ 0.25	$ 0.36	$ 1.16	$ 1.12
Weighted average common shares outstanding:
Basic	22,273	22,129	22,254	22,118
Diluted	22,447	22,262	22,427	22,262