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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Consolidated Statements of Income (Unaudited) [Abstract]        
Revenue $ 600,475 $ 560,209 $ 1,072,306 $ 1,103,541
Cost of sales 128,205 110,263 266,074 215,318
Gross profit 472,270 449,946 806,232 888,223
Operating expenses:        
Selling expenses 248,363 239,449 443,922 473,454
General and administrative expenses 144,109 138,696 274,363 274,322
Total operating expenses 392,472 378,145 718,285 747,776
Operating income 79,798 71,801 87,947 140,447
Other income (expense), net (11,060) (2,758) (13,923) (15,026)
Income before provision for income taxes 68,738 69,043 74,024 125,421
Provision for income taxes 24,025 24,386 25,995 44,482
Net income $ 44,713 $ 44,657 $ 48,029 $ 80,939
Net income per share (Note 2):        
Basic (in dollars per share) $ 0.80 $ 0.76 $ 0.86 $ 1.38
Diluted (in dollars per share) $ 0.79 $ 0.75 $ 0.85 $ 1.35
Weighted-average common shares outstanding:        
Basic (in shares) 55,952 58,506 55,953 58,747
Diluted (in shares) 56,356 59,713 56,388 59,994