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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Restricted Stock and Units Activity | The following table summarizes the activity related to restricted stock unit (RSU) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2023 |  |  | 230,223 |  |  | $ | 165.13 |
Granted |  |  | 121,896 |  |  |  | 136.22 |
Vested |  |  | (132,010 | ) |  |  | 163.85 |
Forfeited |  |  | (3,623 | ) |  |  | 152.21 |
Unvested, December 31, 2023 |  |  | 216,486 |  |  | $ | 149.68 |
The weighted average grant-date fair value per unit of RSU awards granted was $136.22, $140.37 and $208.67 during the years ended December 31, 2023, 2022 and 2021, respectively. The grant date fair value of RSUs that vested during the year was $21.6 million for the year ended December 31, 2023, $18.0 million for the year ended December 31, 2022 and $12.5 million for the year ended December 31, 2021. The fair value of RSUs as of their respective vesting dates was $18.6 million for the year ended December 31, 2023, $15.3 million for the year ended December 31, 2022 and $15.1 million for the year ended December 31, 2021. The following table summarizes the activity related to restricted stock award (RSA) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2023 |  |  | 33,637 |  |  | $ | 178.37 |
Granted |  |  | 2,366 |  |  |  | 126.87 |
Vested |  |  | (18,456 | ) |  |  | 178.82 |
Unvested, December 31, 2023 |  |  | 17,547 |  |  | $ | 170.96 |
Schedule of Nonvested Performance-Based Units Activity | The following table summarizes the activity related to performance unit awards (PSU) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2023 |  |  | 227,866 |  |  | $ | 185.57 |
Granted |  |  | 84,448 |  |  |  | 165.72 |
Vested |  |  | (11,970 | ) |  |  | 155.85 |
Forfeited |  |  | (91,791 | ) |  |  | 170.96 |
Unvested, December 31, 2023 |  |  | 208,553 |  |  | $ | 185.86 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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