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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:      
Total net sales $ 2,365,365 $ 2,406,596 $ 2,419,929
Costs and operating expenses:      
Costs and operating expenses 1,006,689 1,010,700  
Selling and administrative expenses 553,698 534,791 536,902
Research and development expenses 140,777 142,955 143,403
Purchased intangibles amortization 10,587 9,693 7,712
Asset Impairments 6,945    
Litigation provision (settlement) (Note 11) 1,180   (426)
Total costs and operating expenses 1,719,876 1,698,139 1,680,155
Operating income 645,489 708,457 739,774
Other expense (1,775) (3,586) (47,794)
Interest expense (49,070) (48,690) (48,641)
Interest income 16,270 22,058 38,807
Income before income taxes 610,914 678,239 682,146
Provision for income taxes 89,343 86,041 88,352
Net income $ 521,571 $ 592,198 $ 593,794
Net income per basic common share $ 8.40 $ 8.76 $ 7.71
Weighted-average number of basic common shares 62,094 67,627 76,992
Net income per diluted common share $ 8.36 $ 8.69 $ 7.65
Weighted-average number of diluted common shares and equivalents 62,414 68,166 77,618
Product [Member]      
Revenues:      
Total net sales $ 1,497,333 $ 1,567,189 $ 1,604,993
Costs and operating expenses:      
Costs and operating expenses 638,033 642,706 656,275
Service [Member]      
Revenues:      
Total net sales 868,032 839,407 814,936
Costs and operating expenses:      
Costs and operating expenses $ 368,656 $ 367,994 $ 336,289