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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Revenues:        
Total net sales $ 599,162 $ 596,219 $ 1,113,024 $ 1,126,889
Costs and operating expenses:        
Selling and administrative expenses 133,208 136,645 267,547 267,052
Research and development expenses 36,490 35,644 71,550 70,124
Purchased intangibles amortization 2,264 1,602 4,545 3,261
Litigation settlement     0 (1,672)
Total costs and operating expenses 421,508 417,026 814,219 803,321
Operating income 177,654 179,193 298,805 323,568
Other expense (342) (1,828) (867) (1,482)
Interest expense (11,448) (11,692) (23,011) (25,530)
Interest income 5,871 8,888 14,186 18,554
Income before income taxes 171,735 174,561 289,113 315,110
Provision for income taxes 27,325 18,884 35,717 47,482
Net income $ 144,410 $ 155,677 $ 253,396 $ 267,628
Net income per basic common share $ 2.09 $ 2.00 $ 3.60 $ 3.42
Weighted-average number of basic common shares 68,989 77,833 70,331 78,330
Net income per diluted common share $ 2.08 $ 1.98 $ 3.57 $ 3.39
Weighted-average number of diluted common shares and equivalents 69,494 78,438 70,904 79,041
Product [Member]        
Revenues:        
Total net sales $ 387,265 $ 388,869 $ 707,768 $ 727,986
Costs and operating expenses:        
Costs and operating expenses 156,975 159,979 289,365 300,445
Service [Member]        
Revenues:        
Total net sales 211,897 207,350 405,256 398,903
Costs and operating expenses:        
Costs and operating expenses $ 92,571 $ 83,156 $ 181,212 $ 164,111