CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net revenues	[1]	$ 1,473,413	$ 1,079,874	$ 845,486
Cost of net revenues		356,466	264,580	205,376
Gross profit		1,116,947	815,294	640,110
Operating expenses:
Selling, general and administrative		665,777	490,653	390,239
Research and development		97,559	75,720	61,237
Total operating expenses		763,336	566,373	451,476
Income from operations		353,611	248,921	188,634
Interest and other income (expense), net		11,188	(6,355)	(2,533)
Net income before provision for income taxes and equity in losses of investee		364,799	242,566	186,101
Provision for income taxes		130,162	51,200	42,081
Equity in losses of investee, net of tax		3,219	1,684	0
Net income		$ 231,418	$ 189,682	$ 144,020
Net income per share:
Basic (usd per share)		$ 2.89	$ 2.38	$ 1.80
Diluted (usd per share)		$ 2.83	$ 2.33	$ 1.77
Shares used in computing net income per share:
Basic (shares)		80,085	79,856	79,998
Diluted (shares)		81,832	81,484	81,521

[1] Long-lived assets are attributed to countries based on entity that owns the assets.