Quarterly Results Of Operations (Summarized Unaudited Quarterly Results Of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Quarterly Results Of Operations [Abstract]
Net sales	$ 480,683	$ 476,881	$ 453,798	$ 427,089	$ 405,218	$ 373,731	$ 378,526	$ 355,598	$ 1,838,451		$ 1,513,073		$ 1,329,661
Gross profit	193,602	181,532	184,839	178,700	161,988	154,133	154,821	147,541	738,673		618,483		522,386
Operating income	76,001	71,305	79,629	77,721	66,004	62,439	62,780	57,893	304,656	[1]	249,116	[1]	184,854	[1]
Net income	$ 47,388	$ 48,336	$ 50,182	$ 47,951	$ 41,513	$ 38,564	$ 40,398	$ 36,625	$ 193,857		$ 157,100		$ 113,391
Basic earnings per share, As reported	$ 0.57	$ 0.58	$ 0.61	$ 0.58	$ 0.51	$ 0.47	$ 0.50	$ 0.45	$ 2.34		$ 1.93		$ 1.41
Diluted earnings per share, As reported	$ 0.57	$ 0.58	$ 0.60	$ 0.57	$ 0.50	$ 0.47	$ 0.49	$ 0.45	$ 2.32		$ 1.90		$ 1.40
Basic weighted average shares outstanding	82,596	82,402	82,151	81,430	80,899	80,517	80,369	80,080	82,145		80,466		79,716
Diluted weighted average shares outstanding	83,573	83,586	83,778	83,248	82,686	81,938	81,800	81,509	83,543		81,983		80,727

[1] Segment operating income excludes net unallocated corporate operating expenses.