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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2021
Sep. 26, 2020
Oct. 02, 2021
Sep. 26, 2020
Revenues:        
Total net sales $ 659,233 $ 593,784 $ 1,949,425 $ 1,578,707
Costs and operating expenses:        
Selling and administrative expenses 152,545 135,430 453,954 400,614
Research and development expenses 41,986 34,971 125,027 101,115
Purchased intangibles amortization 1,759 2,657 5,408 7,900
Litigation provisions     0 1,180
Total costs and operating expenses 467,418 435,400 1,389,918 1,196,929
Operating income 191,815 158,384 559,507 381,778
Other income (expense), net (607) (1,039) 18,073 (2,149)
Interest expense (11,081) (10,915) (34,054) (38,012)
Interest income 2,548 4,007 10,347 12,046
Income before income taxes 182,675 150,437 553,873 353,663
Provision for income taxes 21,490 23,668 77,269 50,403
Net income $ 161,185 $ 126,769 $ 476,604 $ 303,260
Net income per basic common share $ 2.63 $ 2.04 $ 7.72 $ 4.89
Weighted-average number of basic common shares 61,359 62,002 61,771 62,057
Net income per diluted common share $ 2.60 $ 2.03 $ 7.66 $ 4.86
Weighted-average number of diluted common shares and equivalents 61,888 62,303 62,244 62,371
Product [Member]        
Revenues:        
Total net sales $ 419,133 $ 376,239 $ 1,242,110 $ 965,342
Costs and operating expenses:        
Costs and operating expenses 171,364 166,330 506,985 420,971
Service [Member]        
Revenues:        
Total net sales 240,100 217,545 707,315 613,365
Costs and operating expenses:        
Costs and operating expenses $ 99,764 $ 96,012 $ 298,544 $ 265,149