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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Consolidated Statements of Income (Unaudited) [Abstract]        
Revenue $ 704,190 $ 550,101 $ 1,320,409 $ 1,049,200
Cost of sales 168,549 121,521 314,830 232,787
Gross profit 535,641 428,580 1,005,579 816,413
Operating expenses:        
Selling expenses 272,757 228,353 530,459 437,361
General and administrative expenses 180,120 135,488 333,366 268,051
Total operating expenses 452,877 363,841 863,825 705,412
Operating income 82,764 64,739 141,754 111,001
Other income (expense), net (11,165) (2,731) (9,958) (7,298)
Income before provision for income taxes 71,599 62,008 131,796 103,703
Provision for income taxes 20,638 19,967 45,296 34,173
Net income $ 50,961 $ 42,041 $ 86,500 $ 69,530
Net income per share (Note 2):        
Basic (in dollars per share) $ 0.92 $ 0.79 $ 1.58 $ 1.32
Diluted (in dollars per share) $ 0.90 $ 0.77 $ 1.53 $ 1.28
Weighted-average common shares outstanding:        
Basic (in shares) 55,608 52,929 54,807 52,804
Diluted (in shares) 56,713 54,839 56,430 54,466