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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2017 | Oct. 02, 2016 | Oct. 01, 2017 | Oct. 02, 2016
Revenues: |  |  |  |  |
Products |  | $ 412,854 | $ 334,610 | $ 1,396,413 | $ 1,149,581
Services |  | 90,524 | 75,865 | 260,778 | 223,680
Total revenues |  | 503,378 | 410,475 | 1,657,191 | 1,373,261
Cost of revenues: |  |  |  |  |
Cost of products |  | 169,744 | 148,266 | 591,880 | 531,616
Cost of services |  | 38,848 | 34,850 | 114,373 | 101,084
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) |  | 208,592 | 183,116 | 706,253 | 632,700
Gross profit |  | 294,786 | 227,359 | 950,938 | 740,561
Operating expenses: |  |  |  |  |
Selling and administrative |  | 86,244 | 78,794 | 260,282 | 239,393
Engineering and development |  | 77,190 | 71,400 | 235,101 | 220,973
Acquired intangible assets amortization |  | 7,028 | 8,487 | 23,145 | 44,725
Restructuring and other |  | (4,407) | 12,177 | 392 | 16,372
Goodwill impairment |  |  |  |  | 254,946
Acquired intangible assets impairment |  |  |  |  | 83,339
Total operating expenses |  | 166,055 | 170,858 | 518,920 | 859,748
Income (loss) from operations |  | 128,731 | 56,501 | 432,018 | (119,187)
Non-operating (income) expense: |  |  |  |  |
Interest income |  | (4,517) | (2,892) | (11,329) | (6,201)
Interest expense |  | 5,372 | 633 | 16,283 | 2,034
Other (income) expense, net |  | 439 | (921) | 735 | (1,075)
Income (loss) before income taxes | [1],[2] | 127,437 | 59,681 | 426,329 | (113,945)
Income tax provision (benefit) |  | 24,017 | (4,113) | 62,713 | (4,178)
Net income (loss) |  | $ 103,420 | $ 63,794 | $ 363,616 | $ (109,767)
Net income (loss) per common share: |  |  |  |  |
Basic |  | $ 0.52 | $ 0.32 | $ 1.83 | $ (0.54)
Diluted |  | $ 0.52 | $ 0.31 | $ 1.81 | $ (0.54)
Weighted average common shares-basic |  | 197,485 | 202,211 | 198,755 | 203,167
Weighted average common shares-diluted |  | 200,775 | 203,929 | 201,413 | 203,167
Cash dividend declared per common share |  | $ 0.07 | $ 0.06 | $ 0.21 | $ 0.18
[1] | Included in Corporate and Eliminations are: contingent consideration adjustments, pension and postretirement plans' actuarial gains (losses), impairment of fixed assets and expenses related to the Japan earthquake, property insurance recovery, interest income, interest expense and net foreign exchange gains (losses).
[2] | Included in income (loss) before income taxes are charges and credits related to restructuring and other, inventory charges, a goodwill impairment charge and an acquired intangible assets impairment charge.

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details
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Period Type: | duration