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SHAREHOLDERS’ EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity [Abstract] |
Schedule of Weighted-Average Assumptions Used in BSM Model to Calculate Fair Value of Options | The following table sets forth the key weighted-average assumptions used in the BSM Model to calculate the fair value of options:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
Expected holding period - years | 4.3 |  | 4.1 |  | 4.7
Expected volatility | 43.4% |  | 45.4% |  | 36.5%
Risk-free interest rate | 3.7% |  | 3.8% |  | 1.9%
Expected dividend yield | 0.0% |  | 0.0% |  | 0.0%
Schedule of Grant Date Fair Value and Stock-based Compensation Expense Allocated | The following table summarizes the grant date fair values of stock options and restricted shares issued during the period as well as the allocation of stock-based compensation expense to Total direct costs, and Selling, general and administrative reported in the consolidated statements of operations:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
Weighted average, grant date fair value |  |  |  |  |
Stock options | $ | 148.85 |  |  | $ | 85.30 |  |  | $ | 47.57 |
Restricted shares (RSAs and RSUs) | $ | 372.17 |  |  | $ | 225.69 |  |  | $ | 149.87 |
Stock-based compensation expense allocated to: |  |  |  |  |
Total direct costs | $ | 11,117 |  |  | $ | 11,099 |  |  | $ | 11,801 |
Selling, general, and administrative | 14,397 |  |  | 9,417 |  |  | 9,611 |
Total stock-based compensation expense | $ | 25,514 |  |  | $ | 20,516 |  |  | $ | 21,412 |
Schedule of Stock Option Activity | The following table sets forth the Company’s stock option activity:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price
Outstanding - beginning of Period | 1,343,287 |  | $ | 100.75 |  |  | 1,629,148 |  | $ | 89.71 |  |  | 1,992,915 |  | $ | 68.39 |
Granted | 81,192 |  | $ | 378.45 |  |  | 12,437 |  | $ | 211.25 |  |  | 252,490 |  | $ | 138.91 |
Exercised | (274,733) |  | $ | 57.73 |  |  | (287,048) |  | $ | 39.64 |  |  | (579,407) |  | $ | 38.10 |
Cancelled/Forfeited/Expired | (6,378) |  | $ | 186.83 |  |  | (11,250) |  | $ | 183.04 |  |  | (36,850) |  | $ | 85.40 |
Outstanding - end of period | 1,143,368 |  | $ | 130.33 |  |  | 1,343,287 |  | $ | 100.75 |  |  | 1,629,148 |  | $ | 89.71 |
Exercisable - end of period | 814,980 |  | $ | 110.86 |  |  | 901,865 |  | $ | 74.79 |  |  | 1,116,255 |  | $ | 60.52 |
Schedule of Restricted Share Activity | The following table sets forth the Company’s Restricted Share activity:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| Shares/Units |  | Shares/Units |  | Shares/Units
Outstanding and unvested - beginning of period | 390,998 |  | 523,377 |  | 602,187
Granted | 132,917 |  | 46,836 |  | 165,595
Vested | (130,934) |  | (154,618) |  | (197,000)
Forfeited | (27,489) |  | (24,597) |  | (47,405)
Outstanding and unvested - end of period | 365,492 |  | 390,998 |  | 523,377
Schedule of Stock Options Expected To Vest, Stock Options Exercisable, and Unvested Restricted Share Awards Expected To Vest | The following table summarizes information about stock options expected to vest, stock options exercisable, and unvested restricted share awards expected to vest at December 31, 2024:
| Weighted Average Exercise Price |  | Stock Options |  | Restricted Shares/Units |  | Weighted Average Remaining Life (Years)
Number of stock options expected to vest | $ | 130.33 |  |  | 1,143,368 |  | — |  | 2.4
Number of restricted shares/units expected to vest |  |  |  |  | 365,492 |  |
Total expected to vest |  |  | 1,143,368 |  | 365,492 |  |
Total stock options exercisable | $ | 110.86 |  |  | 814,980 |  | — |  | 2.4
Unrecognized compensation cost (in thousands) |  |  | $ | 7,287 |  |  | $ | 57,902 |  |  |
Weighted average years over which unrecognized compensation cost will be recognized |  |  | 2.8 |  | 4.0 |  |
Schedule of Aggregate Intrinsic Value of Stock Options Exercised, Fair Values of Awards Vested, and Share Based Liabilities Settled | The following table sets forth the aggregate intrinsic value of stock options exercised, the fair values of awards vested, and share based liabilities settled during the respective periods (in thousands):
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
Total intrinsic value of stock options exercised | $ | 89,298 |  |  | $ | 56,548 |  |  | $ | 77,257 |
Total grant-date fair value of stock options vested | $ | 13,992 |  |  | $ | 3,591 |  |  | $ | 5,228 |
Total grant-date fair value of restricted shares vested | $ | 12,903 |  |  | $ | 9,306 |  |  | $ | 9,248 |
Total settlement date fair value of restricted shares vested | $ | 49,503 |  |  | $ | 31,842 |  |  | $ | 32,802 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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