Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Operations [Abstract]
Revenues	$ 1,123,301	$ 1,000,903	$ 789,695
Cost of sales	515,324	464,493	364,631
Direct restructuring charges			1,300
Gross profit	607,977	536,410	423,764
Selling, general and administrative expenses	460,393	404,803	342,961
Restructuring charges			2,539
Asset impairment	1,410	528	141
Income from operations	146,174	131,079	78,123
Foreign currency transaction (gains) losses, net	2,500	(4,886)	(2,325)
Other income, net	(2,711)	(1,578)	(1,001)
Interest expense	837	853	657
Income before taxes	145,548	136,690	80,792
Income tax expense	14,205	23,902	13,066
Net income	$ 131,343	$ 112,788	$ 67,726
Net income per common share (Note 12):
Basic	$ 1.46	$ 1.27	$ 0.78
Diluted	$ 1.44	$ 1.24	$ 0.76