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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Condensed Consolidated Statements of Income        
Revenues $ 230,243 $ 198,723 $ 652,733 $ 567,849
Cost of revenues 94,616 82,149 261,577 232,922
Gross margin 135,627 116,574 391,156 334,927
Operating expenses:        
Research and development 61,091 52,000 175,414 156,756
Selling, general and administrative 49,406 39,606 148,896 119,587
Operating expenses 110,497 91,606 324,310 276,343
Operating income 25,130 24,968 66,846 58,584
Other income (expense):        
Interest income and other, net 2,109 1,923 6,920 4,094
Interest expense (4,932) (4,764) (14,703) (9,265)
Income before income taxes 22,307 22,127 59,063 53,413
Provision (benefit) for income taxes (5,454) 2,178 (9,383) 1,469
Net income $ 27,761 $ 19,949 $ 68,446 $ 51,944
Earnings per share:        
Basic (in dollars per share) $ 0.64 $ 0.47 $ 1.59 $ 1.23
Diluted (in dollars per share) $ 0.63 $ 0.46 $ 1.55 $ 1.20
Weighted-average common shares outstanding:        
Basic (in shares) 43,256 42,553 43,177 42,376
Diluted (in shares) 44,194 43,374 44,135 43,194