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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:      
Total net sales $ 2,419,929 $ 2,309,078 $ 2,167,423
Costs and operating expenses:      
Costs and operating expenses 992,564 947,067  
Selling and administrative expenses 536,902 544,363 512,331
Research and development expenses 143,403 132,593 125,187
Purchased intangibles amortization 7,712 6,743 9,889
Litigation (settlement) provision (Note 11) (426) 11,114 3,524
Acquired in-process research and development (Note 2)   5,000  
Total costs and operating expenses 1,680,155 1,646,880 1,542,384
Operating income 739,774 662,198 625,039
Other expense (47,794) (340) (700)
Interest expense (48,641) (56,839) (44,911)
Interest income 38,807 36,078 20,686
Income before income taxes 682,146 641,097 600,114
Provision for income taxes 88,352 620,786 78,611
Net income $ 593,794 $ 20,311 $ 521,503
Net income per basic common share $ 7.71 $ 0.25 $ 6.46
Weighted-average number of basic common shares 76,992 79,793 80,786
Net income per diluted common share $ 7.65 $ 0.25 $ 6.41
Weighted-average number of diluted common shares and equivalents 77,618 80,604 81,417
Product [Member]      
Revenues:      
Total net sales $ 1,604,993 $ 1,552,349 $ 1,460,296
Costs and operating expenses:      
Costs and operating expenses 656,275 623,214 595,796
Service [Member]      
Revenues:      
Total net sales 814,936 756,729 707,127
Costs and operating expenses:      
Costs and operating expenses $ 336,289 $ 323,853 $ 295,657