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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Income Statement [Abstract] |  |  |
Revenues | $ 693,616 | $ 589,464 | $ 529,675
Cost of revenues | 405,696 | 351,968 | 319,336
Gross profit | 287,920 | 237,496 | 210,339
Operating expenses: |  |  |
Research and development | 89,034 | 81,499 | 74,976
Selling, general and administrative | 115,098 | 106,335 | 99,254
Total operating expenses | 204,132 | 187,834 | 174,230
Operating income | 83,788 | 49,662 | 36,109
Interest income | 1,501 | 2,714 | 1,356
Interest expense | (864) | (1,915) | (3,314)
Other income (expense), net | 750 | 602 | (224)
Income before income taxes | 85,175 | 51,063 | 33,927
Provision (benefit) for income taxes | 6,652 | 11,717 | (70,109)
Net income | $ 78,523 | $ 39,346 | $ 104,036
Net income per share: |  |  |
Basic (in USD per share) | $ 1.02 | $ 0.52 | $ 1.42
Diluted (in USD per share) | $ 0.99 | $ 0.51 | $ 1.38
Weighted-average number of shares used in per share calculations: |  |  |
Basic (in shares) | 76,681 | 74,994 | 73,482
Diluted (in shares) | 79,001 | 77,286 | 75,182

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