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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Income Statement [Abstract]        
Revenues $ 177,996 $ 140,604 $ 496,573 $ 410,835
Cost of revenues 101,247 85,286 286,267 247,644
Gross profit 76,749 55,318 210,306 163,191
Operating expenses:        
Research and development 22,878 20,096 65,064 59,893
Selling, general and administrative 31,834 25,887 82,282 77,354
Total operating expenses 54,712 45,983 147,346 137,247
Operating income 22,037 9,335 62,960 25,944
Interest income 249 724 1,310 1,988
Interest expense (193) (422) (682) (1,539)
Other income, net 299 226 141 223
Income before income taxes 22,392 9,863 63,729 26,616
Provision (benefit) for income taxes (499) 1,584 4,479 5,906
Net income $ 22,891 $ 8,279 $ 59,250 $ 20,710
Net income per share:        
Basic (In dollars per share) $ 0.30 $ 0.11 $ 0.78 $ 0.28
Diluted (In dollars per share) $ 0.29 $ 0.11 $ 0.75 $ 0.27
Basic        
Basic (In shares) 77,029 75,280 76,436 74,749
Diluted (In shares) 78,809 77,291 78,534 76,763