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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Income Statement [Abstract]        
Revenues $ 157,824 $ 138,018 $ 318,577 $ 270,231
Cost of revenues 91,657 82,666 185,020 162,358
Gross profit 66,167 55,352 133,557 107,873
Operating expenses:        
Research and development 20,919 20,074 42,186 39,797
Selling, general and administrative 22,755 26,283 50,448 51,467
Total operating expenses 43,674 46,357 92,634 91,264
Operating income 22,493 8,995 40,923 16,609
Interest income 376 684 1,061 1,264
Interest expense (171) (522) (489) (1,117)
Other income (expense), net (67) 81 (158) (3)
Income before income taxes 22,631 9,238 41,337 16,753
Provision for income taxes 2,162 2,290 4,978 4,322
Net income $ 20,469 $ 6,948 $ 36,359 $ 12,431
Net income per share:        
Basic (In dollars per share) $ 0.27 $ 0.09 $ 0.48 $ 0.17
Diluted (In dollars per share) $ 0.26 $ 0.09 $ 0.46 $ 0.16
Basic        
Basic (In shares) 76,275 74,478 76,140 74,483
Diluted (In shares) 78,861 76,189 78,710 76,061