CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ 22,990	$ 0	$ 0
Net revenues	2,406,796	1,966,492	1,473,413
Cost of net revenues	662,899	518,625	356,466
Gross profit	1,743,897	1,447,867	1,116,947
Operating expenses:
Selling, general and administrative	1,072,053	852,404	665,777
Research and development	157,361	128,899	97,559
Impairments and other (gains) charges	28,498	0	0
Litigation settlement gain	(51,000)	0	0
Total operating expenses	1,201,404	981,303	763,336
Income from operations	542,493	466,564	353,611
Interest income	12,482	8,576	6,948
Other income (expense), net	7,676	(8,489)	4,240
Net income before provision for income taxes and equity in losses of investee	562,651	466,651	364,799
Provision for income taxes	112,347	57,723	130,162
Equity in losses of investee, net of tax	7,528	8,693	3,219
Net income	$ 442,776	$ 400,235	$ 231,418
Net income per share:
Basic (usd per share)	$ 5.57	$ 5.00	$ 2.89
Diluted (usd per share)	$ 5.53	$ 4.92	$ 2.83
Shares used in computing net income per share:
Basic (shares)	79,424	80,064	80,085
Diluted (shares)	80,100	81,357	81,832