CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net revenues	$ 436,924	$ 310,341
Cost of net revenues	109,516	74,716
Gross profit	327,408	235,625
Operating expenses:
Selling, general and administrative	199,625	151,148
Research and development	29,591	22,804
Total operating expenses	229,216	173,952
Income from operations	98,192	61,673
Interest income	2,176	1,195
Other income (expense), net	177	450
Net income before provision for (benefit from) income taxes and equity in losses of investee	100,545	63,318
Provision for (benefit from) income taxes	2,902	(7,223)
Equity in losses of investee, net of tax	1,777	1,121
Net income	$ 95,866	$ 69,420
Net income per share:
Basic (in usd per share)	$ 1.20	$ 0.87
Diluted (in usd per share)	$ 1.17	$ 0.85
Shares used in computing net income per share:
Basic (in shares)	80,036	79,904
Diluted (in shares)	81,628	81,534