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STOCK-BASED EMPLOYEE COMPENSATION - Summary of Share-Based Compensation Activity (Details) | 9 Months Ended
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Sep. 30, 2021 $ / shares shares
Share-Based Awards - Weighted Average Grant Date Fair Value |  |
Performance share units awarded during the period where a grant date was not yet established. | 12,251 |
Restricted Stock Units |  |
Share-Based Awards - Shares |  |
Unvested at December 31, 2020 (in shares) | 305,959 |
Granted (in shares) | 133,667 |
Vested (in shares) | (114,486) |
Forfeited (in shares) | (39,382) |
Unvested at September 30, 2021 (in shares) | 285,758 |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |
Unvested at December 31, 2020 (in dollars per share) | $ / shares | $ 1,697 |
Granted (in dollars per share) | $ / shares | 2,270 |
Vested (in dollars per share) | $ / shares | 1,793 |
Forfeited (in dollars per share) | $ / shares | 1,882 |
Unvested at September 30, 2021 (in dollars per share) | $ / shares | $ 1,901 |
Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at December 31, 2020 (in shares) | 84,478 |
Granted (in shares) | 42,173 | [1]
Vested (in shares) | (55,426) |
Performance share units adjustment (in shares) | 44,346 | [2]
Forfeited (in shares) | (7,248) |
Unvested at September 30, 2021 (in shares) | 108,323 |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |
Unvested at December 31, 2020 (in dollars per share) | $ / shares | $ 1,930 |
Granted (in dollars per share) | $ / shares | 2,287 | [1]
Vested (in dollars per share) | $ / shares | 1,999 |
Performance share units adjustment (in dollars per share) | $ / shares | 2,125 | [2]
Forfeited (in dollars per share) | $ / shares | 1,792 |
Unvested at September 30, 2021 (in dollars per share) | $ / shares | $ 2,123 |
Share-based payment award vesting period | 3 years |
Minimum | Restricted Stock Units |  |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |
Share-based payment award vesting period | 1 year |
Maximum | Restricted Stock Units |  |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |
Share-based payment award vesting period | 3 years |
2021 Grants | Shares probable to be issued | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 63,523 | [3]
2021 Grants | Shares not subject to the achievement of minimum performance thresholds | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 28,198 | [3]
2021 Grants | Shares that could be issued if maximum performance thresholds are met | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 63,523 | [3]
2020 Grants | Shares probable to be issued | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 11,752 |
2020 Grants | Shares not subject to the achievement of minimum performance thresholds | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 0 |
2020 Grants | Shares that could be issued if maximum performance thresholds are met | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 18,080 |
2019 Grants | Shares probable to be issued | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 33,048 |
2019 Grants | Shares not subject to the achievement of minimum performance thresholds | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 33,048 |
2019 Grants | Shares that could be issued if maximum performance thresholds are met | Performance Share Units |  |
Share-Based Awards - Shares |  |
Unvested at September 30, 2021 (in shares) | 61,669 |
Certain Performance Share Units 2021 Grants | Performance Share Units |  |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |
Share-based payment award vesting period | 2 years |
Certain Performance Share Units 2021 Grants | Minimum | Performance Share Units |  |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |
Share-based payment award vesting period | 1 year |
[1] | Excludes 12,251 performance share units awarded during the nine months ended September 30, 2021 for which the grant date under ASC 718, Compensation - Stock Compensation, has not yet been established. Among other conditions, for the grant date to be established, a mutual understanding is required to be reached between the Company and the employee of the key terms and conditions of the award, including the performance targets. The performance targets for each of the annual performance periods under the award are set at the beginning of the respective year.
[2] | Probable outcome for performance-based awards is updated based upon changes in actual and forecasted operating results or expected achievement of performance goals, as applicable, and the impact of modifications.
[3] | Excludes performance share units awarded during the nine months ended September 30, 2021 for which the grant date under ASC 718 has not yet been established as disclosed above.

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