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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Consolidated Statements of Income (Unaudited) [Abstract]        
Revenue $ 560,209 $ 650,027 $ 1,103,541 $ 1,321,088
Cost of sales 110,263 156,010 215,318 262,654
Gross profit 449,946 494,017 888,223 1,058,434
Operating expenses:        
Selling expenses 239,449 283,575 473,454 596,676
General and administrative expenses 138,696 155,705 274,322 305,824
Total operating expenses 378,145 439,280 747,776 902,500
Operating income 71,801 54,737 140,447 155,934
Other income (expense), net (2,758) (21,119) (15,026) (38,627)
Income before provision for income taxes 69,043 33,618 125,421 117,307
Provision for income taxes 24,386 14,111 44,482 42,946
Net income $ 44,657 $ 19,507 $ 80,939 $ 74,361
Net income per share (Note 2):        
Basic (in dollars per share) $ 0.76 $ 0.33 $ 1.38 $ 1.26
Diluted (in dollars per share) $ 0.75 $ 0.32 $ 1.35 $ 1.22
Weighted-average common shares outstanding (000s):        
Basic (in shares) 58,506 59,052 58,747 58,961
Diluted (in shares) 59,713,000 61,118,000 59,994,000 61,177,000