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Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Consolidated Statements of Income (Unaudited) [Abstract]    
Revenue $ 550,094 $ 462,002
Cost of sales 90,045 75,756
Gross profit 460,049 386,246
Operating expenses:    
Selling expenses 241,883 202,535
General and administrative expenses 135,507 112,048
Total operating expenses 377,390 314,583
Operating income 82,659 71,663
Other income (expense), net 112 3,635
Income before provision for income taxes 82,771 75,298
Provision for income taxes 28,489 27,469
Net income $ 54,282 $ 47,829
Net income per share (Note 2):    
Basic (in dollars per share) $ 0.93 $ 0.77
Diluted (in dollars per share) $ 0.90 $ 0.74
Weighted-average common shares outstanding (000s):    
Basic (in shares) 58,352 62,230
Diluted (in shares) 60,566 65,017