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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement [Abstract] |  |  |  |
Revenues(1) | [1] | $ 4,973,070 | $ 4,287,004 | $ 4,314,804
Payroll taxes, benefits and workers’ compensation costs |  | 4,152,968 | 3,480,150 | 3,581,870
Gross profit |  | 820,102 | 806,854 | 732,934
Salaries, wages and payroll taxes |  | 379,171 | 353,273 | 317,124
Stock-based compensation |  | 40,623 | 60,145 | 23,993
Commissions |  | 34,922 | 32,835 | 31,420
Advertising |  | 29,097 | 21,556 | 21,603
General and administrative expenses |  | 124,413 | 113,167 | 123,438
Depreciation and amortization |  | 38,547 | 31,189 | 28,723
Total operating expenses |  | 646,773 | 612,165 | 546,301
Operating income |  | 173,329 | 194,689 | 186,633
Other income (expense): |  |  |  |
Interest income |  | 2,447 | 2,597 | 10,657
Interest expense |  | (7,458) | (8,016) | (7,647)
Income before income tax expense |  | 168,318 | 189,270 | 189,643
Income tax expense |  | 44,238 | 51,033 | 38,544
Net income |  | 124,080 | 138,237 | 151,099
Less distributed and undistributed earnings allocated to participating securities |  | 210 | 782 | 1,759
Net income allocated to common shares |  | $ 123,870 | $ 137,455 | $ 149,340
Basic net income per share of common stock (in dollars per share) |  | $ 3.22 | $ 3.57 | $ 3.72
Diluted net income per share of common stock (in dollars per share) |  | $ 3.18 | $ 3.54 | $ 3.70
Gross billings |  | $ 33,318,693 | $ 28,168,611 | $ 27,212,010
Worksite employee payroll cost |  | $ 28,345,623 | $ 23,881,607 | $ 22,897,206
[1] | Revenues are comprised of gross billings less worksite employee (“WSEE”) payroll costs as follows:
| Year ended December 31,
(in thousands) | 2021 | 2020 | 2019
Gross billings | $ | 33,318,693 |  | $ | 28,168,611 |  | $ | 27,212,010 |
Less: WSEE payroll cost | 28,345,623 |  | 23,881,607 |  | 22,897,206 |
Revenues | $ | 4,973,070 |  | $ | 4,287,004 |  | $ | 4,314,804 |

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