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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Income Statement [Abstract]        
Revenue $ 199,047 $ 211,264 $ 372,531 $ 380,831
Cost of revenue 50,967 54,169 97,251 94,367
Gross margin 148,080 157,095 275,280 286,464
Research, development, and engineering expenses 28,079 26,888 58,321 57,964
Selling, general, and administrative expenses 68,245 66,752 135,056 130,449
Operating income 51,756 63,455 81,903 98,051
Foreign currency gain (loss) 140 (195) (108) (329)
Investment income 5,223 3,559 10,128 6,799
Other income (expense) (144) (246) 783 31
Income before income tax expense 56,975 66,573 92,706 104,552
Income tax expense 8,226 10,377 10,853 11,139
Net Income $ 48,749 $ 56,196 $ 81,853 $ 93,413
Net income per weighted-average common and common-equivalent share:        
Basic (usd per share) $ 0.28 $ 0.33 $ 0.48 $ 0.54
Diluted (usd per share) $ 0.28 $ 0.32 $ 0.47 $ 0.52
Weighted-average common and common-equivalent shares outstanding:        
Basic (shares) 171,318 172,370 171,209 172,825
Diluted (shares) 175,448 177,149 175,528 178,418
Cash dividends per common share (usd per share) $ 0.050 $ 0.045 $ 0.100 $ 0.090