CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net revenues	$ 600,697	$ 490,259	$ 1,149,668	$ 927,183
Cost of net revenues	168,408	124,677	315,283	234,193
Gross profit	432,289	365,582	834,385	692,990
Operating expenses:
Selling, general and administrative	267,948	212,087	515,058	411,712
Research and development	38,851	30,804	76,354	60,395
Impairments and other charges	0	0	29,782	0
Litigation settlement gain	(51,000)	0	(51,000)	0
Total operating expenses	255,799	242,891	570,194	472,107
Income from operations	176,490	122,691	264,191	220,883
Interest income	3,465	1,917	6,098	4,093
Other income (expense), net	13,892	(7,099)	8,146	(6,922)
Net income before provision for income taxes and equity in losses of investee	193,847	117,509	278,435	218,054
Provision for income taxes	43,121	7,703	51,917	10,605
Equity in losses of investee, net of tax	3,584	3,701	7,528	5,478
Net income	$ 147,142	$ 106,105	$ 218,990	$ 201,971
Net income per share:
Basic (in usd per share)	$ 1.84	$ 1.32	$ 2.74	$ 2.52
Diluted (in usd per share)	$ 1.83	$ 1.30	$ 2.71	$ 2.48
Shares used in computing net income per share:
Basic (in shares)	79,943	80,216	79,901	80,127
Diluted (in shares)	80,590	81,471	80,665	81,575