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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
Compensation Related Costs [Abstract] |
Schedule of Option Activity | Option activity was as follows:
| Number of Shares |  | Range of Exercise Price |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contract Life (in years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2020 | 2,023,100 |  |  | $10.22 - $66.65 |  | $ | 34.18 |  |  | 6.99 |  | $ | 117.8 |
Granted | 159,000 |  |  | $91.98 |  | $ | 91.98 |  |  |  |  |
Exercised | (206,000) |  |  | $20.49 - $39.82 |  | $ | 30.78 |  |  |  |  |
Outstanding at December 31, 2021 | 1,976,100 |  |  | $10.22 - $91.98 |  | $ | 39.18 |  |  | 6.24 |  | $ | 80.8 |
Granted | 202,100 |  |  | $67.29 |  | $ | 67.29 |  |  |  |  |
Exercised | — |  |  |  |  |  |  |  |  |
Canceled or expired | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2022 | 2,178,200 |  |  | $10.22 - $91.98 |  | $ | 41.79 |  |  | 5.60 |  | $ | 79.6 |
Granted | 140,800 |  |  | $76.78 |  | $ | 76.78 |  |  |  |  |
Exercised | (419,340) |  |  | $10.22 - $34.21 |  | $ | 17.77 |  |  |  |  |
Canceled or expired | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2023 | 1,899,660 |  |  | $20.49 - $91.98 |  | $ | 49.69 |  |  | 5.53 |  | $ | 72.4 |
Exercisable at December 31, 2021 | 1,473,420 |  |  | $10.22 - $66.65 |  | $ | 29.55 |  |  | 5.59 |  | $ | 72.9 |
Exercisable at December 31, 2022 | 1,766,070 |  |  | $10.22 - $91.98 |  | $ | 34.40 |  |  | 4.96 |  | $ | 76.5 |
Exercisable at December 31, 2023 | 1,571,105 |  |  | $20.49 - $91.98 |  | $ | 44.32 |  |  | 4.93 |  | $ | 68.1 |
Fair Value Assumption for Options Granted | The Company estimated the fair value of each option granted on the date of grant using the Black-Scholes option-pricing model, using the assumptions in the following table:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Dividend yield | 0 | % |  | 0 | % |  | 0 | %
Expected volatility | 35 | % |  | 31 | % |  | 30 | %
Risk-free interest rate | 3.96 | % |  | 1.89 | % |  | 0.56 | %
Expected life (in years) | 5 |  | 5 |  | 5
Weighted-average grant date fair value | $ | 28.87 |  |  | $ | 20.43 |  |  | $ | 25.09 |
The assumptions used to estimate the fair value of awards with both a performance and a market condition were as follows:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Dividend yield | 0 | % |  | 0 | % |  | 0 | %
Expected volatility | 37 | % |  | 34 | % |  | 42 | %
Risk-free interest rate | 4.31 | % |  | 1.71 | % |  | 0.20 | %
Expected life (in years) | 3 |  | 3 |  | 3
Weighted-average grant date fair value | $ | 81.58 |  |  | $ | 71.19 |  |  | $ | 99.73 |
Summarized Information Regarding Options Outstanding | The following table summarizes information regarding options outstanding at December 31, 2023:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Price |  | Number of Shares |  | Weighted-Average Remaining Contractual Life (in years) |  | Weighted- Average Exercise Price |  | Number of Shares |  | Weighted- Average Exercise Price
$20.49 - $27.35 |  | 346,000 |  |  | 3.16 |  | $ | 20.49 |  |  | 346,000 |  |  | $ | 20.49 |
$27.36 - $37.02 |  | 354,090 |  |  | 4.16 |  | $ | 34.21 |  |  | 354,090 |  |  | $ | 34.21 |
$37.03 - $53.24 |  | 385,670 |  |  | 5.10 |  | $ | 39.82 |  |  | 385,670 |  |  | $ | 39.82 |
$53.25 - $66.97 |  | 312,000 |  |  | 6.10 |  | $ | 66.65 |  |  | 312,000 |  |  | $ | 66.65 |
$66.98 - $91.98 |  | 501,900 |  |  | 8.09 |  | $ | 77.77 |  |  | 173,345 |  |  | $ | 82.39 |
|  | 1,899,660 |  |  | 5.53 |  | $ | 49.69 |  |  | 1,571,105 |  |  | $ | 44.32 |
Unvested Restricted Stock Awards Activity | The following table presents unvested restricted stock awards activity for the year ended December 31, 2023:
| Restricted Stock Awards — without Market Condition |  | Restricted Stock Awards — with Market Condition
| Number of Shares |  | Weighted-Average Grant Date Fair Value per Share |  | Number of Shares |  | Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock awards at December 31, 2022 | 2,061,894 |  |  | $ | 67.15 |  |  | 620,880 |  |  | $ | 80.55 |
Granted | 1,096,446 |  |  | $ | 73.27 |  |  | 283,440 |  |  | $ | 81.58 |
Vested | (787,883) |  |  | $ | 66.51 |  |  | (90,408) |  |  | $ | 72.69 |
Canceled | (230,546) |  |  | $ | 68.58 |  |  | (132,792) |  |  | $ | 72.69 |
Unvested restricted stock awards at December 31, 2023 | 2,139,911 |  |  | $ | 70.38 |  |  | 681,120 |  |  | $ | 83.56 |
The following table presents unvested restricted stock units activity for the year ended December 31, 2023:
| Number of Units |  | Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock units at December 31, 2022 | 21,560 |  |  | $ | 65.24 |
Granted | 10,465 |  |  | $ | 70.74 |
Vested | (8,129) |  |  | $ | 65.77 |
Canceled | (977) |  |  | $ | 68.34 |
Unvested restricted stock units at December 31, 2023 | 22,919 |  |  | $ | 67.43 |
The following tables presents the Matching RSU activity for the year ended December 31, 2023:
| Number of Matching RSU Shares |  | Weighted-Average Grant Date Fair Value per Share
Unvested MSPP restricted stock units at December 31, 2022 | 180,431 |  |  | $ | 60.52 |
Granted | 82,374 |  |  | $ | 67.36 |
Vested | (52,710) |  |  | $ | 46.91 |
Canceled | (13,128) |  |  | $ | 66.67 |
Unvested MSPP restricted stock units at December 31, 2023 | 196,967 |  |  | $ | 66.61 |

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