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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013
Income Statement [Abstract] |  |  |  |
Revenues | $ 610,774 | $ 522,478 | $ 1,699,355 | $ 1,559,442
Cost of sales | (389,042) | (339,637) | (1,097,521) | (1,030,052)
Gross profit | 221,732 | 182,841 | 601,834 | 529,390
Selling, general and administrative expenses | (119,104) | (96,197) | (359,854) | (281,682)
Research and development | (30,444) | (21,141) | (82,633) | (62,497)
Amortization of intangibles | (15,203) | (12,326) | (42,739) | (38,408)
Income from equity method investment | 1,030 | 758 | 3,240 | 5,285
Operating income | 58,011 | 53,935 | 119,848 | 152,088
Interest expense | (21,656) | (19,259) | (58,679) | (53,509)
Interest income | 159 | 92 | 420 | 349
Income from continuing operations before taxes | 36,514 | 34,768 | 61,589 | 98,928
Income tax expense | (2,667) | (5,700) | (2,571) | (18,123)
Income from continuing operations | 33,847 | 29,068 | 59,018 | 80,805
Loss from disposal of discontinued operations, net of tax |  |  | (562) |
Net income | 33,847 | 29,068 | 58,456 | 80,805
Weighted average number of common shares and equivalents: |  |  |  |
Basic | 43,201 | 43,694 | 43,439 | 44,013
Diluted | 43,910 | 44,537 | 44,164 | 44,916
Basic income (loss) per share: |  |  |  |
Continuing operations | $ 0.78 | $ 0.67 | $ 1.36 | $ 1.84
Discontinued operations |  |  | $ (0.01) |
Net income | $ 0.78 | $ 0.67 | $ 1.35 | $ 1.84
Diluted income (loss) per share: |  |  |  |
Continuing operations | $ 0.77 | $ 0.65 | $ 1.33 | $ 1.80
Discontinued operations |  |  | $ (0.01) |
Net income | $ 0.77 | $ 0.65 | $ 1.32 | $ 1.80
Comprehensive income | $ 30,783 | $ 34,776 | $ 57,958 | $ 73,618
Dividends declared per share | $ 0.05 | $ 0.05 | $ 0.15 | $ 0.15

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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