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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of restricted stock award and unit activity | The following tables summarizes activity for the three months ended March 31, 2023 and 2022:
| Number of Unvested Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Number of Unvested Performance Vesting Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2023 | 197,772 |  |  | $ | 77.49 |  |  | 190,804 |  |  | $ | 52.15 |
Granted | 43,415 |  |  | 77.84 |  |  | 68,726 |  |  | 56.57 |
Vested | (11,608) |  |  | 70.86 |  |  | — |  |  | — |
Forfeited/canceled | (971) |  |  | 87.68 |  |  | (5,069) |  |  | 47.67 |
Unvested shares as of March 31, 2023 | 228,608 |  |  | $ | 77.85 |  |  | 254,461 |  |  | $ | 53.43 |
| Number of Unvested Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Number of Unvested Performance Vesting Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2022 | 198,413 |  |  | $ | 66.04 |  |  | 153,138 |  |  | $ | 48.54 |
Granted | 2,154 |  |  | 73.83 |  |  | — |  |  | — |
Vested | (3,074) |  |  | 65.75 |  |  | — |  |  | — |
Forfeited/canceled | (1,157) |  |  | 66.89 |  |  | — |  |  | — |
Unvested shares as of March 31, 2022 | 196,336 |  |  | $ | 67.16 |  |  | 153,138 |  |  | $ | 48.54 |
Schedule of Grant Date Fair Value of Awards Granted | The table below summarizes the assumptions used in the Monte Carlo simulation to determine the grant date fair value of awards granted during the three months ended March 31, 2023:
Grant date | January 24, 2023 | March 3, 2023
Forecast period (years) | 3 | 3
Risk-free interest rates | 3.88% | 4.64%
Implied equity volatility | 87.2% | 86.4%
Stock price on the date of grant | $72.99 | $82.20

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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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