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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues: |  |  |  |
Total revenues | [1],[2] | $ 3,121,469 | $ 2,294,965 | $ 2,100,802
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) |  | 1,335,728 | 955,136 | 880,408
Gross profit |  | 1,785,741 | 1,339,829 | 1,220,394
Operating expenses: |  |  |  |
Selling and administrative |  | 464,769 | 437,084 | 390,669
Engineering and development |  | 374,964 | 322,824 | 301,505
Acquired intangible assets amortization |  | 30,803 | 40,147 | 39,191
Restructuring and other |  | (13,202) | (13,880) | 15,232
Total operating expenses |  | 857,334 | 786,175 | 746,597
Income from operations |  | 928,407 | 553,654 | 473,797
Non-operating (income) expenses: |  |  |  |
Interest income |  | (5,982) | (16,990) | (20,458)
Interest expense |  | 24,182 | 22,224 | 21,780
Other (income) expense, net |  | 9,192 | 22,648 | 4,674
Income before income taxes |  | 901,015 | 525,772 | 467,801
Income tax provision |  | 116,868 | 58,304 | 16,022
Net income |  | $ 784,147 | $ 467,468 | $ 451,779
Net income per common share: |  |  |  |
Basic |  | $ 4.72 | $ 2.74 | $ 2.41
Diluted |  | $ 4.28 | $ 2.60 | $ 2.35
Weighted average common shares—basic |  | 166,120 | 170,425 | 187,672
Weighted average common shares—diluted |  | 183,042 | 179,459 | 192,605
Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues |  | $ 2,690,906 | $ 1,887,674 | $ 1,729,621
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) |  | 1,157,476 | 782,047 | 727,138
Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues |  | 430,563 | 407,291 | 371,181
Cost of revenues: |  |  |  |
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below) |  | $ 178,252 | $ 173,089 | $ 153,270
[1] | Includes $10.0 million, $8.4 million and $12.0 million in 2020, 2019 and 2018, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”
[2] | Revenues attributable to a country are based on location of customer site.

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