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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Net revenues $ 1,966,492 $ 1,473,413 $ 1,079,874
Cost of net revenues 518,625 356,466 264,580
Gross profit 1,447,867 1,116,947 815,294
Operating expenses:      
Selling, general and administrative 852,404 665,777 490,653
Research and development 128,899 97,559 75,720
Total operating expenses 981,303 763,336 566,373
Income from operations 466,564 353,611 248,921
Interest income 8,576 6,948 4,213
Other income (expense), net (8,489) 4,240 (10,568)
Net income before provision for income taxes and equity in losses of investee 466,651 364,799 242,566
Provision for income taxes 57,723 130,162 51,200
Equity in losses of investee, net of tax 8,693 3,219 1,684
Net income $ 400,235 $ 231,418 $ 189,682
Net income per share:      
Basic (usd per share) $ 5.00 $ 2.89 $ 2.38
Diluted (usd per share) $ 4.92 $ 2.83 $ 2.33
Shares used in computing net income per share:      
Basic (shares) 80,064 80,085 79,856
Diluted (shares) 81,357 81,832 81,484