Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Income [Abstract]
Net sales	$ 757,175	$ 706,423	$ 1,119,129	$ 1,019,312
Cost of sales	534,770	494,984	792,161	716,463
Gross profit	222,405	211,439	326,968	302,849
Selling and administrative expenses	114,271	113,518	212,813	204,352
Operating income	108,134	97,921	114,155	98,497
Interest expense, net	2,200	1,824	3,677	3,469
Income before income taxes and equity earnings	105,934	96,097	110,478	95,028
Provision for income taxes	41,018	37,670	42,055	37,251
Equity earnings in unconsolidated investments	27	150	171	162
Net income	$ 64,943	$ 58,577	$ 68,594	$ 57,939
Earnings per share:
Basic (in dollars per share)	$ 1.38	$ 1.21	$ 1.45	$ 1.19
Diluted (in dollars per share)	$ 1.34	$ 1.19	$ 1.42	$ 1.17
Weighted average shares outstanding: [Abstract]
Basic (in shares)	47,142	48,231	47,330	48,546
Diluted (in shares)	48,288	49,116	48,430	49,352
Cash dividends declared per common share	$ 0.16	$ 0.14	$ 0.30	$ 0.27