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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Revenues:        
Total net sales $ 519,984 $ 599,162 $ 984,923 $ 1,113,024
Costs and operating expenses:        
Selling and administrative expenses 117,449 133,208 265,184 267,547
Research and development expenses 31,155 36,490 66,144 71,550
Purchased intangibles amortization 2,618 2,264 5,243 4,545
Litigation provision 514   1,180  
Total costs and operating expenses 364,870 421,508 761,529 814,219
Operating income 155,114 177,654 223,394 298,805
Other expense (736) (342) (1,110) (867)
Interest expense (13,018) (11,448) (27,097) (23,011)
Interest income 4,003 5,871 8,039 14,186
Income before income taxes 145,363 171,735 203,226 289,113
Provision for income taxes 22,434 27,325 26,735 35,717
Net income $ 122,929 $ 144,410 $ 176,491 $ 253,396
Net income per basic common share $ 1.98 $ 2.09 $ 2.84 $ 3.60
Weighted-average number of basic common shares 61,944 68,989 62,085 70,331
Net income per diluted common share $ 1.98 $ 2.08 $ 2.83 $ 3.57
Weighted-average number of diluted common shares and equivalents 62,184 69,494 62,404 70,904
Product [Member]        
Revenues:        
Total net sales $ 314,920 $ 387,265 $ 589,103 $ 707,768
Costs and operating expenses:        
Costs and operating expenses 134,802 156,975 254,641 289,365
Service [Member]        
Revenues:        
Total net sales 205,064 211,897 395,820 405,256
Costs and operating expenses:        
Costs and operating expenses $ 78,332 $ 92,571 $ 169,137 $ 181,212