Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Consolidated Statements of Income [Abstract]
Revenue	$ 604,899	$ 677,026
Cost of sales	161,499	170,566
Gross profit	443,400	506,460
Operating expenses:
Selling expenses	242,699	275,965
General and administrative expenses	148,556	167,582
Total operating expenses	391,255	443,547
Operating income	52,145	62,913
Other income (expense), net	(1,453)	1,582
Income before provision for income taxes	50,692	64,495
Provision for income taxes	11,976	17,065
Net income	$ 38,716	$ 47,430
Net income per share (Note 6):
Basic (in dollars per share)	$ 0.77	$ 0.94
Diluted (in dollars per share)	$ 0.76	$ 0.91
Weighted-average common shares outstanding:
Basic (in shares)	49,991	50,706
Diluted (in shares)	51,066	52,172