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STOCK-BASED EMPLOYEE COMPENSATION - Summary of Share-Based Compensation Activity (Details)
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Restricted Stock Units  
Share-Based Awards - Shares  
Unvested (in shares) 256,745
Granted (in shares) 212,913
Vested (in shares) (117,709)
Forfeited (in shares) (15,636)
Unvested (in shares) 336,313
Share-Based Awards - Weighted Average Grant Date Fair Value  
Unvested (in dollars per share) | $ / shares $ 1,801
Granted (in dollars per share) | $ / shares 1,644
Vested (in dollars per share) | $ / shares 1,811
Forfeited (in dollars per share) | $ / shares 1,784
Unvested (in dollars per share) | $ / shares $ 1,698
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 Awards - Shares  
Unvested (in shares) 216,083
Granted (in shares) 0
Vested (in shares) (81,396)
Performance share units adjustment (in shares) (50,182)
Forfeited (in shares) (4,547)
Unvested (in shares) 79,958
Share-Based Awards - Weighted Average Grant Date Fair Value  
Unvested (in dollars per share) | $ / shares $ 1,835
Vested (in dollars per share) | $ / shares 1,740
Performance share units adjustment (in dollars per share) | $ / shares 1,944
Forfeited (in dollars per share) | $ / shares 1,840
Unvested (in dollars per share) | $ / shares $ 1,859
Performance Share Units | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 3 years
Performance Share Units | 2019 Grants | Shares probable to be issued  
Share-Based Awards - Shares  
Unvested (in shares) 44,237
Performance Share Units | 2019 Grants | Shares not subject to the achievement of minimum performance thresholds  
Share-Based Awards - Shares  
Unvested (in shares) 44,237
Performance Share Units | 2019 Grants | Shares that could be issued if maximum performance thresholds are met  
Share-Based Awards - Shares  
Unvested (in shares) 115,310
Performance Share Units | 2018 Grants | Shares probable to be issued  
Share-Based Awards - Shares  
Unvested (in shares) 35,721
Performance Share Units | 2018 Grants | Shares not subject to the achievement of minimum performance thresholds  
Share-Based Awards - Shares  
Unvested (in shares) 35,721
Performance Share Units | 2018 Grants | Shares that could be issued if maximum performance thresholds are met  
Share-Based Awards - Shares  
Unvested (in shares) 62,606