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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Oct. 01, 2022
Sep. 30, 2023
Oct. 01, 2022
Revenues:        
Total net sales $ 711,692 $ 708,555 $ 2,136,942 $ 2,113,446
Costs and operating expenses:        
Selling and administrative expenses 186,748 164,417 555,657 483,769
Research and development expenses 41,995 43,435 130,559 127,913
Purchased intangibles amortization 12,116 1,592 20,410 4,863
Acquired in-process research and development     0 9,797
Total costs and operating expenses 532,266 516,545 1,583,489 1,526,334
Operating income 179,426 192,010 553,453 587,112
Other income, net 328 895 1,364 2,600
Interest expense (30,442) (12,420) (68,158) (34,898)
Interest income 3,883 2,896 11,984 7,536
Income before income taxes 153,195 183,381 498,643 562,350
Provision for income taxes 18,643 27,383 72,614 81,657
Net income $ 134,552 $ 155,998 $ 426,029 $ 480,693
Net income per basic common share $ 2.28 $ 2.61 $ 7.21 $ 7.98
Weighted-average number of basic common shares 59,093 59,801 59,061 60,200
Net income per diluted common share $ 2.27 $ 2.6 $ 7.19 $ 7.94
Weighted-average number of diluted common shares and equivalents 59,255 60,081 59,262 60,521
Product [Member]        
Revenues:        
Total net sales $ 448,081 $ 464,923 $ 1,362,464 $ 1,385,393
Costs and operating expenses:        
Costs and operating expenses 184,332 199,918 559,040 593,884
Service [Member]        
Revenues:        
Total net sales 263,611 243,632 774,478 728,053
Costs and operating expenses:        
Costs and operating expenses $ 107,075 $ 107,183 $ 317,823 $ 306,108