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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Revenues:    
Total net sales $ 608,545 $ 464,939
Costs and operating expenses:    
Costs and operating expenses 95,271  
Selling and administrative expenses 143,196 147,735
Research and development expenses 38,092 34,989
Purchased intangibles amortization 1,840 2,625
Litigation provision 0 666
Total costs and operating expenses 437,275 396,659
Operating income 171,270 68,280
Other income (expense),net 9,359 (374)
Interest expense (10,946) (14,079)
Interest income 4,101 4,036
Income before income taxes 173,784 57,863
Provision for income taxes 25,657 4,301
Net income $ 148,127 $ 53,562
Net income per basic common share $ 2.38 $ 0.86
Weighted-average number of basic common shares 62,260 62,232
Net income per diluted common share $ 2.37 $ 0.86
Weighted-average number of diluted common shares and equivalents 62,632 62,626
Product [Member]    
Revenues:    
Total net sales $ 382,022 $ 274,183
Costs and operating expenses:    
Costs and operating expenses 158,876 119,839
Service [Member]    
Revenues:    
Total net sales $ 226,523 190,756
Costs and operating expenses:    
Costs and operating expenses   $ 90,805