Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements of Income [Abstract]
Revenue	$ 2,695,669	$ 2,581,934	$ 2,420,416
Cost of sales	675,223	658,028	581,420
Gross profit	2,020,446	1,923,906	1,838,996
Operating expenses:
Selling expenses	1,068,189	1,019,494	955,600
General and administrative expenses	666,395	646,848	615,970
Restructuring and impairment expenses	51,870	0	0
Total operating expenses	1,786,454	1,666,342	1,571,570
Operating income	233,992	257,564	267,426
Other income (expense), net (Note 17)	(1,533)	(1,332)	(12,254)
Income before provision for income taxes	232,459	256,232	255,172
Provision for income taxes	85,193	64,877	81,619
Net income	$ 147,266	$ 191,355	$ 173,553
Net income per share:
Basic (in dollars per share)	$ 2.93	$ 3.66	$ 3.13
Diluted (in dollars per share)	$ 2.86	$ 3.63	$ 3.10
Weighted-average common shares outstanding:
Basic (in shares)	50,193	52,296	55,518
Diluted (in shares)	51,427	52,765	55,927