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Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements of Income (Unaudited) [Abstract]
Revenue	$ 518,028	$ 623,623
Cost of sales	125,793	146,664
Gross profit	392,235	476,959
Operating expenses:
Selling expenses	206,042	249,708
General and administrative expenses	149,628	158,598
Total operating expenses	355,670	408,306
Operating income	36,565	68,653
Other income (expense), net	(6,174)	(2,848)
Income before provision for income taxes	30,391	65,805
Provision for income taxes	10,661	22,803
Net income	$ 19,730	$ 43,002
Net income per share (Note 6):
Basic (in dollars per share)	$ 0.36	$ 0.78
Diluted (in dollars per share)	$ 0.36	$ 0.77
Weighted-average common shares outstanding:
Basic (in shares)	55,059	55,436
Diluted (in shares)	55,101	56,128

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