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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Total revenues | $ 1,489,593 | $ 1,372,054 | $ 1,207,295
Cost of revenues | 231,782 | 237,323 | 201,074
Gross profit | 1,257,811 | 1,134,731 | 1,006,221
Operating expenses: |  |  |
Sales and marketing | 413,474 | 379,183 | 338,304
Research, development and engineering | 64,295 | 54,396 | 48,370
General and administrative | 445,431 | 424,072 | 375,267
Total operating expenses | 923,200 | 857,651 | 761,941
Income from operations | 334,611 | 277,080 | 244,280
Interest expense, net | 131,975 | 69,546 | 61,987
Gain on sale of businesses | (17,122) | 0 | 0
Loss on investments, net | 20,991 | 4,211 | 73
Other (income) expense , net | (31,632) | 3,725 | 4,633
Income before income taxes and net loss in earnings of equity method investment | 230,399 | 199,598 | 177,587
Income tax expense (benefit) | 68,393 | (19,376) | 44,760
Net loss in earnings of equity method investment | 11,338 | 168 | 4,140
Net income | $ 150,668 | $ 218,806 | $ 128,687
Net income per common share: |  |  |
Basic (in dollars per share) | $ 3.24 | $ 4.52 | $ 2.64
Diluted (in dollars per share) | $ 3.18 | $ 4.39 | $ 2.59
Weighted average shares outstanding: |  |  |
Basic (in shares) | 46,308,825 | 47,647,397 | 47,950,746
Diluted (in shares) | 47,122,511 | 49,025,684 | 48,927,791
Cash dividends paid per common share (in dollars per share) | $ 0 | $ 0.90 | $ 1.68
Share-based compensation expense | $ 24,006 | $ 23,922 | $ 28,093
Cost of revenues |  |  |
Weighted average shares outstanding: |  |  |
Share-based compensation expense | 535 | 525 | 510
Sales and marketing |  |  |
Weighted average shares outstanding: |  |  |
Share-based compensation expense | 1,454 | 1,547 | 1,798
Research, development and engineering |  |  |
Weighted average shares outstanding: |  |  |
Share-based compensation expense | 1,779 | 1,477 | 1,553
General and administrative |  |  |
Weighted average shares outstanding: |  |  |
Share-based compensation expense | $ 20,238 | $ 20,373 | $ 24,232

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