Condensed Consolidated Statements of Operations (Unaudited) (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
[IncomeStatementAbstract]
Net sales	$ 901,180	$ 862,705	$ 2,703,269	$ 2,583,817
Cost of sales	769,842	747,450	2,312,490	2,230,560
Gross profit	131,338	115,255	390,779	353,257
Selling, general & administrative expenses	111,783	100,304	337,417	301,458
Special (gains) charges	443	2,855	(6,203)	3,198
Operating income	19,112	12,096	59,565	48,601
Foreign currency exchange (gain) loss	1,776	(1,843)	39	558
Interest and other income, net	(267)	(168)	(1,024)	(602)
Interest expense	464	361	1,504	1,084
Income before income taxes	17,139	13,746	59,046	47,561
Provision for income taxes	6,510	5,124	19,292	17,738
Net income	$ 10,629	$ 8,622	$ 39,754	$ 29,823
Net income per common share:
Basic	$ 0.29	$ 0.23	$ 1.08	$ 0.81
Diluted	$ 0.29	$ 0.23	$ 1.07	$ 0.79
Weighted average shares outstanding:
Basic	36,547	37,053	36,840	36,935
Diluted	36,720	37,586	37,169	37,577