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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Revenues:        
Total net sales $ 577,278 $ 578,021 $ 1,690,302 $ 1,704,910
Costs and operating expenses:        
Selling and administrative expenses 126,036 126,997 393,583 394,049
Research and development expenses 34,333 35,173 105,883 105,297
Purchased intangibles amortization 2,619 2,114 7,164 5,375
Litigation (settlement) provision   924   (748)
Total costs and operating expenses 404,043 406,347 1,218,262 1,209,668
Operating income 173,235 171,674 472,040 495,242
Other expense (496) (811) (1,363) (2,293)
Interest expense (11,456) (11,435) (34,467) (36,965)
Interest income 3,455 9,802 17,641 28,356
Income before income taxes 164,738 169,230 453,851 484,340
Provision for income taxes 26,605 28,216 62,322 75,698
Net income $ 138,133 $ 141,014 $ 391,529 $ 408,642
Net income per basic common share $ 2.09 $ 1.84 $ 5.68 $ 5.26
Weighted-average number of basic common shares 66,226 76,575 68,952 77,741
Net income per diluted common share $ 2.07 $ 1.83 $ 5.63 $ 5.21
Weighted-average number of diluted common shares and equivalents 66,768 77,136 69,533 78,395
Product [Member]        
Revenues:        
Total net sales $ 370,573 $ 378,522 $ 1,078,341 $ 1,106,508
Costs and operating expenses:        
Costs and operating expenses 149,793 155,825 439,158 456,270
Service [Member]        
Revenues:        
Total net sales 206,705 199,499 611,961 598,402
Costs and operating expenses:        
Costs and operating expenses $ 91,262 $ 85,314 $ 272,474 $ 249,425