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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement [Abstract] |  |  |  |
Revenues(1) | [1] | $ 4,287,004 | $ 4,314,804 | $ 3,828,549
Payroll taxes, benefits and workers’ compensation costs |  | 3,480,150 | 3,581,870 | 3,146,640
Gross profit |  | 806,854 | 732,934 | 681,909
Salaries, wages and payroll taxes |  | 353,273 | 317,124 | 301,027
Stock-based compensation |  | 60,145 | 23,993 | 20,425
Commissions |  | 32,835 | 31,420 | 28,957
Advertising |  | 21,556 | 21,603 | 18,554
General and administrative expenses |  | 113,167 | 123,438 | 111,068
Depreciation and amortization |  | 31,189 | 28,723 | 22,842
Total operating expenses |  | 612,165 | 546,301 | 502,873
Operating income |  | 194,689 | 186,633 | 179,036
Other income (expense): |  |  |  |
Interest income |  | 2,597 | 10,657 | 7,992
Interest expense |  | (8,016) | (7,647) | (4,668)
Income before income tax expense |  | 189,270 | 189,643 | 182,360
Income tax expense |  | 51,033 | 38,544 | 46,947
Net income |  | 138,237 | 151,099 | 135,413
Less distributed and undistributed earnings allocated to participating securities |  | 782 | 1,759 | 1,875
Net income allocated to common shares |  | $ 137,455 | $ 149,340 | $ 133,538
Basic net income per share of common stock (in dollars per share) |  | $ 3.57 | $ 3.72 | $ 3.24
Diluted net income per share of common stock (in dollars per share) |  | $ 3.54 | $ 3.70 | $ 3.22
Gross billings |  | $ 28,168,611 | $ 27,212,010 | $ 23,830,731
Worksite employee payroll cost |  | $ 23,881,607 | $ 22,897,206 | $ 20,002,182
[1] | Revenues are comprised of gross billings less worksite employee (“WSEE”) payroll costs as follows:
| Year ended December 31,
(in thousands) | 2020 | 2019 | 2018
Gross billings | $ | 28,168,611 |  | $ | 27,212,010 |  | $ | 23,830,731 |
Less: WSEE payroll cost | 23,881,607 |  | 22,897,206 |  | 20,002,182 |
Revenues | $ | 4,287,004 |  | $ | 4,314,804 |  | $ | 3,828,549 |

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