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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Condensed Consolidated Statements of Income    
Revenues $ 205,384 $ 179,028
Cost of revenues 81,147 73,867
Gross margin 124,237 105,161
Operating expenses:    
Research and development 54,828 52,324
Selling, general and administrative 45,694 40,155
Operating expenses 100,522 92,479
Operating income 23,715 12,682
Other income (expense):    
Interest income and other, net 3,202 576
Interest expense (4,883) 198
Income before income taxes 22,034 13,456
Provision (benefit) for income taxes (4,371) (1,970)
Net income $ 26,405 $ 15,426
Earnings per share:    
Basic (in dollars per share) $ 0.61 $ 0.37
Diluted (in dollars per share) $ 0.60 $ 0.36
Weighted-average common shares outstanding:    
Basic (in shares) 42,963 42,096
Diluted (in shares) 43,918 43,030