Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Statements Of Operations [Abstract]
Revenues	$ 363,827	$ 330,942	$ 675,483	$ 602,740
Cost of sales	162,960	134,857	308,767	261,856
Gross profit	200,867	196,085	366,716	340,884
Selling, general and administrative expenses	150,246	124,718	278,445	229,009
Asset impairment charges	202	106	202	819
Income from operations	50,419	71,261	88,069	111,056
Foreign currency transaction losses, net	814	(1,627)	3,414	2,649
Interest income	(517)	(549)	(823)	(907)
Interest expense	266	132	475	179
Other (income) expense, net	195	(520)	167	(761)
Income before taxes	49,661	73,825	84,836	109,896
Income tax expense	14,305	12,301	20,519	20,026
Net income	$ 35,356	$ 61,524	$ 64,317	$ 89,870
Net income per common share (Note 11):
Basic	$ 0.40	$ 0.68	$ 0.73	$ 1.00
Diluted	$ 0.40	$ 0.68	$ 0.72	$ 0.99