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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of total shares granted, forfeited and delivered | Following is a summary of the total restricted shares granted, forfeited and delivered (vested) to participants with the related weighted average grant date fair value share prices. Of the shares that vested in the nine months ended September 30, 2023, the Company withheld 31,254 shares to satisfy the tax obligations for those participants who elected this option as permitted under the applicable equity plan. As of the grant dates, the fair value of shares that were granted during the nine months ended September 30, 2023 was $9,222,000. As of the vesting dates, the aggregate fair value of shares that vested during the nine months ended September 30, 2023 was $12,208,000.
Award Activity: | Three Months Ended September 30, 2023 |  | Nine Months Ended September 30, 2023
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 84,616 |  |  | $ | 153.76 |  |  | 102,508 |  |  | $ | 133.29 |
Granted (1) (2) | — |  |  | — |  |  | 61,875 |  |  | 149.05 |
Forfeited | — |  |  | — |  |  | (1,015) |  |  | 144.79 |
Vested | (52) |  |  | 120.39 |  |  | (78,804) |  |  | 123.53 |
Unvested at end of period | 84,564 |  |  | $ | 153.78 |  |  | 84,564 |  |  | $ | 153.78 |
(1) Includes shares granted in prior years for which performance conditions have been satisfied and the number of shares have been determined. (2) Does not include the restricted shares that may be earned if the performance goals established in 2021 and 2022 for long-term performance and in 2023 for annual and long-term performance are achieved. Depending on the actual level of achievement of the goals at the end of the open performance periods, the number of shares earned could range from zero to 135,133.

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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