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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

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