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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues:      
Total net sales $ 2,785,874 $ 2,365,365 $ 2,406,596
Costs and operating expenses:      
Costs and operating expenses 1,156,533 1,006,689  
Selling and administrative expenses 626,968 553,698 534,791
Research and development expenses 168,358 140,777 142,955
Purchased intangibles amortization 7,143 10,587 9,693
Asset Impairments 0 6,945 0
Litigation provision (Note 11) 5,165 1,180 0
Total costs and operating expenses 1,964,167 1,719,876 1,698,139
Operating income 821,707 645,489 708,457
Other income (expense), net 17,203 (1,775) (3,586)
Interest expense (44,938) (49,070) (48,690)
Interest income 12,221 16,270 22,058
Income before income taxes 806,193 610,914 678,239
Provision for income taxes 113,350 89,343 86,041
Net income $ 692,843 $ 521,571 $ 592,198
Net income per basic common share $ 11.25 $ 8.40 $ 8.76
Weighted-average number of basic common shares 61,575 62,094 67,627
Net income per diluted common share $ 11.17 $ 8.36 $ 8.69
Weighted-average number of diluted common shares and equivalents 62,028 62,414 68,166
Product [Member]      
Revenues:      
Total net sales $ 1,822,070 $ 1,497,333 $ 1,567,189
Costs and operating expenses:      
Costs and operating expenses 752,514 638,033 642,706
Service [Member]      
Revenues:      
Total net sales 963,804 868,032 839,407
Costs and operating expenses:      
Costs and operating expenses $ 404,019 $ 368,656 $ 367,994