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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated Statements of Income [Abstract]      
Revenue $ 2,279,099 $ 2,207,797 $ 2,247,047
Cost of sales 502,078 500,457 489,510
Gross profit 1,777,021 1,707,340 1,757,537
Operating expenses:      
Selling expenses 938,024 922,083 951,372
General and administrative expenses 564,514 554,153 561,463
Total operating expenses 1,502,538 1,476,236 1,512,835
Operating income 274,483 231,104 244,702
Other income (expense), net (Note 23) (8,916) (18,265) (32,743)
Income before provision for income taxes 265,567 212,839 211,959
Provision for income taxes 136,130 69,753 78,913
Net income $ 129,437 $ 143,086 $ 133,046
Net income per share:      
Basic (in dollars per share) $ 2.45 $ 2.58 $ 2.29
Diluted (in dollars per share) $ 2.36 $ 2.55 $ 2.25
Weighted-average common shares outstanding:      
Basic (in shares) 52,806 55,412 57,997
Diluted (in shares) 54,852 56,097 59,057