Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements of Income (Unaudited) [Abstract]
Cost of sales	$ 75,756	$ 100,654
Gross profit	386,246	295,191
Operating expenses:
Selling expenses	202,535	169,142
General and administrative expenses	112,048	101,142
Total operating expenses	314,583	270,284
Operating income	71,663	24,907
Other income (expense), net	3,635	(422)
Income before provision for income taxes	75,298	24,485
Provision for income taxes	27,469	9,177
Net income	$ 47,829	$ 15,308
Net income per share (Note 2):
Basic (in dollars per share)	$ 0.77	$ 0.25
Diluted (in dollars per share)	$ 0.74	$ 0.24
Weighted-average common shares outstanding (000s):
Basic (in shares)	62,230	61,888
Diluted (in shares)	65,017	64,017