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STOCK-BASED EMPLOYEE COMPENSATION - Summary of Share-Based Compensation Activity (Details)
9 Months Ended
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.