CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net revenues	$ 385,267	$ 278,589	$ 1,052,090	$ 786,671
Cost of net revenues	92,779	69,387	253,060	191,626
Gross profit	292,488	209,202	799,030	595,045
Operating expenses:
Selling, general and administrative	169,524	126,708	483,636	360,385
Research and development	24,201	20,415	71,389	54,111
Total operating expenses	193,725	147,123	555,025	414,496
Income from operations	98,763	62,079	244,005	180,549
Interest and other income (expense), net	3,750	1,463	8,607	1,161
Net income before provision for income taxes and equity in losses of investee	102,513	63,542	252,612	181,710
Provision for income taxes	18,344	11,698	26,508	39,172
Equity in losses of investee, net of tax	1,614	477	4,950	477
Net income	$ 82,555	$ 51,367	$ 221,154	$ 142,061
Net income per share:
Basic (in usd per share)	$ 1.03	$ 0.64	$ 2.76	$ 1.78
Diluted (in usd per share)	$ 1.01	$ 0.63	$ 2.71	$ 1.74
Shares used in computing net income per share:
Basic (in shares)	80,163	79,977	80,086	79,920
Diluted (in shares)	81,789	81,466	81,757	81,523