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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Income Statement [Abstract]    
Product sales $ 324,296 $ 307,857
Service sales 173,673 167,389
Total net sales 497,969 475,246
Cost of product sales 133,156 129,258
Cost of service sales 77,939 71,893
Selling and administrative expenses 130,524 129,351
Research and development expenses 30,752 29,438
Purchased intangibles amortization 1,729 2,644
Acquired in-process research and development 5,000  
Total costs and operating expenses 379,100 362,584
Operating income 118,869 112,662
Interest expense (12,725) (10,119)
Interest income 7,343 4,087
Income from operations before income taxes 113,487 106,630
Provision for income taxes 7,930 12,578
Net income $ 105,557 $ 94,052
Net income per basic common share $ 1.32 $ 1.16
Weighted-average number of basic common shares 80,073 81,275
Net income per diluted common share $ 1.31 $ 1.15
Weighted-average number of diluted common shares and equivalents 80,769 81,974