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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Revenues:    
Total net sales $ 464,939 $ 513,862
Costs and operating expenses:    
Selling and administrative expenses 147,735 134,339
Research and development expenses 34,989 35,060
Purchased intangibles amortization 2,625 2,281
Litigation provision 666  
Total costs and operating expenses 396,659 392,711
Operating income 68,280 121,151
Other expense (374) (525)
Interest expense (14,079) (11,563)
Interest income 4,036 8,315
Income before income taxes 57,863 117,378
Provision for income taxes 4,301 8,392
Net income $ 53,562 $ 108,986
Net income per basic common share $ 0.86 $ 1.52
Weighted-average number of basic common shares 62,232 71,704
Net income per diluted common share $ 0.86 $ 1.51
Weighted-average number of diluted common shares and equivalents 62,626 72,415
Product [Member]    
Revenues:    
Total net sales $ 274,183 $ 320,503
Costs and operating expenses:    
Costs and operating expenses 119,839 132,390
Service [Member]    
Revenues:    
Total net sales 190,756 193,359
Costs and operating expenses:    
Costs and operating expenses $ 90,805 $ 88,641