Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Consolidated Statements of Income [Abstract]
Revenue	$ 537,805	$ 641,152	$ 1,703,319	$ 2,022,233
Cost of sales	173,500	158,907	483,099	501,448
Gross profit	364,305	482,245	1,220,220	1,520,785
Operating expenses:
Selling expenses	216,478	260,333	678,603	816,887
General and administrative expenses	137,987	156,528	428,105	490,225
Restructuring and impairment expenses	30,124	0	30,124	0
Total operating expenses	384,589	416,861	1,136,832	1,307,112
Operating income (loss)	(20,284)	65,384	83,388	213,673
Other income (expense), net	(8,680)	2,781	(18,773)	351
Income (loss) before provision for income taxes	(28,964)	68,165	64,615	214,024
Provision (benefit) for income taxes	(3,574)	18,436	17,052	57,527
Net income (loss)	$ (25,390)	$ 49,729	$ 47,563	$ 156,497
Net income (loss) per share (Note 6):
Basic (in dollars per share)	$ (0.51)	$ 0.99	$ 0.95	$ 3.11
Diluted (in dollars per share)	$ (0.51)	$ 0.97	$ 0.94	$ 3.03
Weighted-average common shares outstanding:
Basic (in shares)	50,199	50,098	50,187	50,304
Diluted (in shares)	50,199	51,260	50,822	51,629