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
Consolidated Statements of Operations [Abstract]
Net sales	$ 1,238,019	$ 1,169,197	$ 3,926,875	$ 3,470,731
Costs of goods sold	1,074,504	1,014,552	3,396,701	2,997,236
Gross profit	163,515	154,645	530,174	473,495
Operating expenses:
Selling and administrative expenses	135,071	129,511	420,558	385,052
Severance and restructuring expenses	529	298	4,458	1,687
Earnings from operations	27,915	24,836	105,158	86,756
Non-operating (income) expense:
Interest income	(536)	(161)	(1,294)	(467)
Interest expense	1,753	1,899	5,209	5,957
Net foreign currency exchange loss (gain)	633	130	(531)	743
Other expense, net	451	348	1,240	1,097
Earnings before income taxes	25,614	22,620	100,534	79,426
Income tax expense	8,448	8,188	34,953	28,915
Net earnings	$ 17,166	$ 14,432	$ 65,581	$ 50,511
Net earnings per share:
Basic	$ 0.38	$ 0.31	$ 1.43	$ 1.09
Diluted	$ 0.38	$ 0.31	$ 1.41	$ 1.08
Shares used in per share calculations:
Basic	44,886	46,268	46,001	46,193
Diluted	45,417	46,865	46,550	46,749