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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Consolidated Statements of Income (Unaudited) [Abstract]    
Revenue $ 499,099 $ 471,831
Cost of sales 111,266 137,869
Gross profit 387,833 333,962
Operating expenses:    
Selling expenses 209,008 195,559
General and administrative expenses 132,563 130,254
Total operating expenses 341,571 325,813
Operating income 46,262 8,149
Other income (expense), net (4,567) (2,863)
Income before provision for income taxes 41,695 5,286
Provision for income taxes 14,206 1,970
Net income $ 27,489 $ 3,316
Net income per share:    
Basic (in dollars per share) $ 0.52 $ 0.06
Diluted (in dollars per share) $ 0.51 $ 0.06
Weighted-average common shares outstanding:    
Basic (in shares) 52,678 55,955
Diluted (in shares) 54,057 56,411