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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Revenues: |  |  |  |
Total revenues | $ 582,038 | $ 566,848 | $ 1,640,315 | $ 1,581,244
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | 237,000 | 233,155 | 683,724 | 670,385
Gross profit | 345,038 | 333,693 | 956,591 | 910,859
Operating expenses: |  |  |  |
Selling and administrative | 109,166 | 100,199 | 319,990 | 290,115
Engineering and development | 77,804 | 77,049 | 236,030 | 226,799
Acquired intangible assets amortization | 9,647 | 11,142 | 30,363 | 28,633
Restructuring and other | (6,500) | 1,710 | (11,792) | 3,785
Total operating expenses | 190,117 | 190,100 | 574,591 | 549,332
Income from operations | 154,921 | 143,593 | 382,000 | 361,527
Non-operating (income) expense: |  |  |  |
Interest income | (5,159) | (6,213) | (18,641) | (17,620)
Interest expense | 5,682 | 5,557 | 17,195 | 18,087
Other (income) expense, net | 2,665 | 3,405 | 6,557 | 4,385
Income before income taxes | 151,733 | 140,844 | 376,889 | 356,675
Income tax provision | 15,873 | 20,863 | 34,494 | 48,684
Net income | $ 135,860 | $ 119,981 | $ 342,395 | $ 307,991
Net income per common share: |  |  |  |
Basic | $ 0.80 | $ 0.65 | $ 2.00 | $ 1.62
Diluted | $ 0.75 | $ 0.63 | $ 1.92 | $ 1.57
Weighted average common shares-basic | 169,641 | 185,744 | 171,471 | 190,576
Weighted average common shares-diluted | 180,494 | 190,505 | 178,685 | 196,300
Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | $ 488,170 | $ 470,994 | $ 1,339,123 | $ 1,308,969
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | 197,196 | 195,339 | 555,863 | 557,074
Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 93,868 | 95,854 | 301,192 | 272,275
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | $ 39,804 | $ 37,816 | $ 127,861 | $ 113,311

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