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v3.8.0.1

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Apr. 01, 2017
Revenues: |  |
Product sales | $ 339,117 | $ 324,296
Service sales | 191,553 | 173,673
Total net sales | 530,670 | 497,969
Costs and operating expenses: |  |
Cost of product sales | 140,466 | 133,156
Cost of service sales | 80,955 | 77,939
Selling and administrative expenses | 130,407 | 130,673
Research and development expenses | 34,480 | 30,752
Litigation settlement | (1,672) |
Purchased intangibles amortization | 1,659 | 1,729
Acquired in-process research and development |  | 5,000
Total costs and operating expenses | 386,295 | 379,249
Operating income | 144,375 | 118,720
Other income | 346 | 149
Interest expense | (13,838) | (12,725)
Interest income | 9,666 | 7,343
Income before income taxes | 140,549 | 113,487
Provision for income taxes | 28,598 | 7,930
Net income | $ 111,951 | $ 105,557
Net income per basic common share | $ 1.42 | $ 1.32
Weighted-average number of basic common shares | 78,883 | 80,073
Net income per diluted common share | $ 1.40 | $ 1.31
Weighted-average number of diluted common shares and equivalents | 79,715 | 80,769

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