CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net revenues	$ 356,482	$ 269,362	$ 666,823	$ 508,082
Cost of net revenues	85,565	64,146	160,281	122,239
Gross profit	270,917	205,216	506,542	385,843
Operating expenses:
Selling, general and administrative	162,964	121,467	314,112	233,677
Research and development	24,384	18,613	47,188	33,696
Total operating expenses	187,348	140,080	361,300	267,373
Income from operations	83,569	65,136	145,242	118,470
Interest and other income (expense), net	3,212	125	4,857	(302)
Net income before provision for income taxes and equity in losses of investee	86,781	65,261	150,099	118,168
Provision for income taxes	15,387	15,113	8,164	27,474
Equity in losses of investee, net of tax	2,215	0	3,336	0
Net income	$ 69,179	$ 50,148	$ 138,599	$ 90,694
Net income per share:
Basic (in usd per share)	$ 0.86	$ 0.63	$ 1.73	$ 1.14
Diluted (in usd per share)	$ 0.85	$ 0.62	$ 1.70	$ 1.11
Shares used in computing net income per share:
Basic (in shares)	80,188	79,951	80,047	79,891
Diluted (in shares)	81,631	81,281	81,668	81,440