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Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Consolidated Statements of Income (Unaudited) [Abstract]        
Revenue $ 638,800 $ 908,299 $ 1,959,888 $ 2,120,932
Cost of sales 109,275 139,816 371,929 341,134
Gross profit 529,525 768,483 1,587,959 1,779,798
Operating expenses:        
Selling expenses 263,203 437,662 859,879 967,926
General and administrative expenses 161,366 162,546 467,190 446,355
Total operating expenses 424,569 600,208 1,327,069 1,414,281
Operating income 104,956 168,275 260,890 365,517
Other income (expense), net 1,073 504 (37,554) (571)
Income before provision for income taxes 106,029 168,779 223,336 364,946
Provision for income taxes 37,721 57,879 80,667 125,329
Net income $ 68,308 $ 110,900 $ 142,669 $ 239,617
Net income per share (Note 2):        
Basic (in dollars per share) $ 1.15 $ 1.89 $ 2.42 $ 4.09
Diluted (in dollars per share) $ 1.12 $ 1.80 $ 2.34 $ 3.91
Weighted-average common shares outstanding (000s):        
Basic (in shares) 59,249,000 58,661,000 59,058,000 58,544,000
Diluted (in shares) 60,777,000,000 61,508,000,000 61,010,000,000 61,234,000,000