Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Consolidated Statements of Income [Abstract]
Revenue	$ 500,257	$ 560,615	$ 981,719	$ 1,165,514
Cost of sales	135,542	148,100	269,130	309,599
Gross profit	364,715	412,515	712,589	855,915
Operating expenses:
Selling expenses	185,165	219,426	373,289	462,125
General and administrative expenses	137,044	141,562	270,943	290,118
Restructuring and impairment expenses	0	0	9,787	0
Total operating expenses	322,209	360,988	654,019	752,243
Operating income	42,506	51,527	58,570	103,672
Other expense, net	(5,393)	(8,640)	(6,869)	(10,093)
Income before provision for income taxes	37,113	42,887	51,701	93,579
Provision for income taxes	10,221	8,650	13,433	20,626
Net income	$ 26,892	$ 34,237	$ 38,268	$ 72,953
Net income per share (Note 6):
Basic (in dollars per share)	$ 0.54	$ 0.68	$ 0.77	$ 1.45
Diluted (in dollars per share)	$ 0.54	$ 0.67	$ 0.76	$ 1.43
Weighted-average common shares outstanding:
Basic (in shares)	49,931	50,368	49,789	50,181
Diluted (in shares)	50,161	50,960	50,098	50,959