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STOCK-BASED EMPLOYEE COMPENSATION - Summary of Share-Based Compensation Activity (Details)
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Restricted Stock Units  
Share-Based Awards - Shares  
Unvested at December 31, 2019 (in shares) 256,745
Granted (in shares) 216,229
Vested (in shares) (123,872)
Forfeited (in shares) (28,043)
Unvested at September 30, 2020 (in shares) 321,059
Share-Based Awards - Weighted Average Grant Date Fair Value  
Unvested at December 31, 2019 (in dollars per share) | $ / shares $ 1,801
Granted (in dollars per share) | $ / shares 1,646
Vested (in dollars per share) | $ / shares 1,820
Forfeited (in dollars per share) | $ / shares 1,766
Unvested at September 30, 2020 (in dollars per share) | $ / shares $ 1,692
Restricted Stock Units | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 1 year
Restricted Stock Units | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 3 years
Performance Share Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 3 years
Share-Based Awards - Shares  
Unvested at December 31, 2019 (in shares) 216,083
Granted (in shares) 5,540
Vested (in shares) (81,839)
Performance share units adjustment (in shares) (50,209) [1]
Forfeited (in shares) (4,896)
Unvested at September 30, 2020 (in shares) 84,679
Share-Based Awards - Weighted Average Grant Date Fair Value  
Unvested at December 31, 2019 (in dollars per share) | $ / shares $ 1,835
Granted (in dollars per share) | $ / shares 2,373
Vested (in dollars per share) | $ / shares 1,741
Performance share units adjustment (in dollars per share) | $ / shares 1,944 [1]
Forfeited (in dollars per share) | $ / shares 1,834
Unvested at September 30, 2020 (in dollars per share) | $ / shares $ 1,893
Performance Share Units | 2018 Grants | Shares probable to be issued  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 35,514
Performance Share Units | 2018 Grants | Shares not subject to the achievement of minimum performance thresholds  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 35,514
Performance Share Units | 2018 Grants | Shares that could be issued if maximum performance thresholds are met  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 62,547
Performance Share Units | 2019 Grants | Shares probable to be issued  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 43,625
Performance Share Units | 2019 Grants | Shares not subject to the achievement of minimum performance thresholds  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 43,625
Performance Share Units | 2019 Grants | Shares that could be issued if maximum performance thresholds are met  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 114,086
Performance Share Units | 2020 Grants | Shares probable to be issued  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 5,540
Performance Share Units | 2020 Grants | Shares not subject to the achievement of minimum performance thresholds  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 0
Performance Share Units | 2020 Grants | Shares that could be issued if maximum performance thresholds are met  
Share-Based Awards - Shares  
Unvested at September 30, 2020 (in shares) 11,080
[1] Probable outcome for these 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.