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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Income Statement [Abstract]        
Revenue $ 251,073 $ 183,325 $ 587,405 $ 555,856
Cost of revenue 59,741 47,632 151,261 144,883
Gross margin 191,332 135,693 436,144 410,973
Research, development, and engineering expenses 30,240 28,115 96,583 86,436
Selling, general, and administrative expenses 64,206 64,486 193,497 199,542
Restructuring charges (Note 16) 251 0 15,049 0
Intangible asset impairment charges (Note 8) 0 0 19,571 0
Operating income 96,635 43,092 111,444 124,995
Foreign currency gain (loss) 2,357 (1,295) (310) (1,403)
Investment income 2,490 5,114 11,010 15,242
Other income (expense) (173) 456 (153) 1,239
Income before income tax expense 101,309 47,367 121,991 140,073
Income tax expense 13,803 5,682 15,150 16,535
Net Income $ 87,506 $ 41,685 $ 106,841 $ 123,538
Net income per weighted-average common and common-equivalent share:        
Basic (usd per share) $ 0.50 $ 0.24 $ 0.62 $ 0.72
Diluted (usd per share) $ 0.49 $ 0.24 $ 0.61 $ 0.71
Weighted-average common and common-equivalent shares outstanding:        
Basic (shares) 173,943 170,744 172,881 171,053
Diluted (shares) 177,138 174,449 176,038 175,164
Cash dividends per common share (usd per share) $ 0.055 $ 0.050 $ 0.165 $ 0.150