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
Consolidated Statements of Income [Abstract]
Net sales	$ 503,584	$ 455,020	$ 1,522,896	$ 1,372,320
Cost of sales	355,678	324,151	1,072,141	974,625
Gross profit	147,906	130,869	450,755	397,695
Selling and administrative expenses	106,993	93,822	311,345	279,667
Operating income	40,913	37,047	139,410	118,028
Interest expense, net	1,641	376	5,110	4,658
Income before income taxes and equity earnings	39,272	36,671	134,300	113,370
Provision for income taxes	15,126	13,902	52,377	44,044
Equity earnings in unconsolidated investments	23	15	185	117
Net income	$ 24,169	$ 22,784	$ 82,108	$ 69,443
Earnings per share:
Basic Earnings Per Share (in dollars per share)	$ 0.50	$ 0.46	$ 1.70	$ 1.40
Diluted Earnings Per Share (in dollars per share)	$ 0.50	$ 0.45	$ 1.67	$ 1.38
Weighted average shares outstanding:
Basic (in shares)	47,987	49,615	48,357	49,442
Diluted (in shares)	48,772	50,168	49,157	50,160
Cash dividends declared per common share (in dollars per share)	$ 0.14	$ 0.13	$ 0.41	$ 0.39