Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 287,192	$ 251,014	$ 539,778	$ 474,566
Cost of sales	225,759	204,591	430,754	383,320
Gross profit	61,433	46,423	109,024	91,246
Selling, general and administrative expenses	34,992	27,455	67,852	54,905
Executive succession	733		1,876
Operating profit	25,708	18,968	39,296	36,341
Interest expense, net	85	56	203	130
Income before income taxes	25,623	18,912	39,093	36,211
Provision for income taxes	9,758	7,204	14,856	13,387
Net income	$ 15,865	$ 11,708	$ 24,237	$ 22,824
Net income per common share:
Basic	$ 0.68	$ 0.52	$ 1.05	$ 1.02
Diluted	$ 0.67	$ 0.52	$ 1.03	$ 1.01
Weighted average common shares outstanding:
Basic	23,261	22,516	23,139	22,479
Diluted	23,650	22,731	23,553	22,686