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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Revenues:        
Total net sales $ 593,784 $ 577,278 $ 1,578,707 $ 1,690,302
Costs and operating expenses:        
Selling and administrative expenses 135,430 126,036 400,614 393,583
Research and development expenses 34,971 34,333 101,115 105,883
Purchased intangibles amortization 2,657 2,619 7,900 7,164
Litigation provision     1,180  
Total costs and operating expenses 435,400 404,043 1,196,929 1,218,262
Operating income 158,384 173,235 381,778 472,040
Other expense (1,039) (496) (2,149) (1,363)
Interest expense (10,915) (11,456) (38,012) (34,467)
Interest income 4,007 3,455 12,046 17,641
Income before income taxes 150,437 164,738 353,663 453,851
Provision for income taxes 23,668 26,605 50,403 62,322
Net income $ 126,769 $ 138,133 $ 303,260 $ 391,529
Net income per basic common share $ 2.04 $ 2.09 $ 4.89 $ 5.68
Weighted-average number of basic common shares 62,002 66,226 62,057 68,952
Net income per diluted common share $ 2.03 $ 2.07 $ 4.86 $ 5.63
Weighted-average number of diluted common shares and equivalents 62,303 66,768 62,371 69,533
Product [Member]        
Revenues:        
Total net sales $ 376,239 $ 370,573 $ 965,342 $ 1,078,341
Costs and operating expenses:        
Costs and operating expenses 166,330 149,793 420,971 439,158
Service [Member]        
Revenues:        
Total net sales 217,545 206,705 613,365 611,961
Costs and operating expenses:        
Costs and operating expenses $ 96,012 $ 91,262 $ 265,149 $ 272,474