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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Consolidated Statements of Income (Unaudited) [Abstract]        
Revenue $ 571,308 $ 638,800 $ 1,674,849 $ 1,959,888
Cost of sales 152,755 109,275 368,073 371,929
Gross profit 418,553 529,525 1,306,776 1,587,959
Operating expenses:        
Selling expenses 240,260 263,203 713,714 859,879
General and administrative expenses 135,752 161,366 410,074 467,190
Total operating expenses 376,012 424,569 1,123,788 1,327,069
Operating income 42,541 104,956 182,988 260,890
Other income (expense), net (14,428) 1,073 (29,454) (37,554)
Income before provision for income taxes 28,113 106,029 153,534 223,336
Provision for income taxes 11,846 37,721 56,328 80,667
Net income $ 16,267 $ 68,308 $ 97,206 $ 142,669
Net income per share (Note 2):        
Basic (in dollars per share) $ 0.28 $ 1.15 $ 1.66 $ 2.42
Diluted (in dollars per share) $ 0.28 $ 1.12 $ 1.63 $ 2.34
Weighted-average common shares outstanding (000s):        
Basic (in shares) 57,725 59,249 58,403 59,058
Diluted (in shares) 58,663 60,777 59,565 61,010