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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