CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net revenues	$ 734,144	$ 607,341	$ 1,637,421	$ 1,757,009
Cost of net revenues	200,056	169,787	484,649	485,070
Gross profit	534,088	437,554	1,152,772	1,271,939
Operating expenses:
Selling, general and administrative	312,492	277,514	852,365	792,572
Research and development	44,527	39,680	126,420	116,034
Impairments and other (gains) charges	0	(6,792)	0	22,990
Litigation settlement gain	0	0	0	(51,000)
Total operating expenses	357,019	310,402	978,785	880,596
Income from operations	177,069	127,152	173,987	391,343
Interest income	329	3,478	2,788	9,576
Other income (expense), net	7,147	(2,211)	(12,368)	5,935
Total interest income and other income (expense), net	7,476	1,267	(9,580)	15,511
Net income before provision for (benefit from) income taxes and equity in losses of investee	184,545	128,419	164,407	406,854
Provision for (benefit from) income taxes	45,174	25,895	(1,452,493)	77,812
Equity in losses of investee, net of tax	0	0	0	7,528
Net income	$ 139,371	$ 102,524	$ 1,616,900	$ 321,514
Net income per share:
Basic (in usd per share)	$ 1.77	$ 1.29	$ 20.54	$ 4.03
Diluted (in usd per share)	$ 1.76	$ 1.28	$ 20.45	$ 4.00
Shares used in computing net income per share:
Basic (in shares)	78,824	79,332	78,729	79,709
Diluted (in shares)	79,163	79,825	79,078	80,397