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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 01, 2023
Apr. 02, 2022
Revenues:    
Total net sales $ 684,674 $ 690,572
Costs and operating expenses:    
Selling and administrative expenses 181,956 157,475
Research and development expenses 42,691 40,472
Purchased intangibles amortization 1,479 1,673
Acquired in-process research and development 0 9,797
Total costs and operating expenses 510,506 495,102
Operating income 174,168 195,470
Other income, net 1,388 170
Interest expense (14,444) (11,059)
Interest income 4,061 2,114
Income before income taxes 165,173 186,695
Provision for income taxes 24,250 26,864
Net income $ 140,923 $ 159,831
Net income per basic common share $ 2.39 $ 2.64
Weighted-average number of basic common shares 59,023 60,580
Net income per diluted common share $ 2.38 $ 2.62
Weighted-average number of diluted common shares and equivalents 59,317 60,952
Product [Member]    
Revenues:    
Total net sales $ 436,457 $ 450,840
Costs and operating expenses:    
Costs and operating expenses 180,354 191,610
Service [Member]    
Revenues:    
Total net sales 248,217 239,732
Costs and operating expenses:    
Costs and operating expenses $ 104,026 $ 94,075