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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
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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

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- Definition The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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