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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Revenues: |  |  |  |
Total revenues | $ 564,178 | $ 526,929 | $ 1,058,277 | $ 1,014,396
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | 240,260 | 219,595 | 446,724 | 437,230
Gross profit | 323,918 | 307,334 | 611,553 | 577,166
Operating expenses: |  |  |  |
Selling and administrative | 108,811 | 99,410 | 210,824 | 189,916
Engineering and development | 81,434 | 75,342 | 158,225 | 149,750
Acquired intangible assets amortization | 10,083 | 9,793 | 20,717 | 17,491
Restructuring and other | (10,404) | 2,389 | (5,292) | 2,076
Total operating expenses | 189,924 | 186,934 | 384,474 | 359,233
Income from operations | 133,994 | 120,400 | 227,079 | 217,933
Non-operating (income) expense: |  |  |  |
Interest income | (5,430) | (5,427) | (13,482) | (11,407)
Interest expense | 5,800 | 5,639 | 11,513 | 12,530
Other (income) expense, net | 2,447 | 176 | 3,892 | 979
Income before income taxes | 131,177 | 120,012 | 225,156 | 215,831
Income tax provision | 33,780 | 18,975 | 18,621 | 27,821
Net income | $ 97,397 | $ 101,037 | $ 206,535 | $ 188,010
Net income per common share: |  |  |  |
Basic | $ 0.57 | $ 0.53 | $ 1.20 | $ 0.97
Diluted | $ 0.55 | $ 0.52 | $ 1.16 | $ 0.94
Weighted average common shares-basic | 171,241 | 190,730 | 172,387 | 192,992
Weighted average common shares-diluted | 178,590 | 194,909 | 177,781 | 199,197
Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | $ 457,511 | $ 434,051 | $ 850,953 | $ 837,976
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | 193,299 | 180,777 | 358,667 | 361,735
Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 106,667 | 92,878 | 207,324 | 176,420
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) | $ 46,961 | $ 38,818 | $ 88,057 | $ 75,495

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