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STOCK COMPENSATION PLAN - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 16, 2018
Nov. 08, 2018
Jul. 17, 2018
Apr. 17, 2018
Mar. 15, 2018
Apr. 17, 2017
Apr. 15, 2017
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares reserved for issuance (in shares)                 6,565,000  
Shares remaining available for grants (in shares)                 2,600,000  
Term of plan                 7 years  
Options exercisable (in shares)                   0
Allocated share-based compensation expense                 $ 17.2 $ 6.8
Shares withheld for withholding taxes (in shares)                   89,620
Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Fair value of restricted stock and restricted stock units vested                 12.8 $ 7.0
Deferred stock-based compensation                 $ 19.9  
Weighted average remaining contractual terms                 2 years 1 month 2 days  
Shares withheld for withholding taxes (in shares)                 167,297 89,620
Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Allocated share-based compensation expense                 $ 4.3  
Deferred stock-based compensation                 $ 7.1  
Awards granted (in shares)                 617,100  
Number of awards vested (in shares)                 0  
Performance-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Allocated share-based compensation expense                 $ 3.1  
Deferred stock-based compensation                 $ 8.3  
Awards granted (in shares)                 617,100  
Number of awards vested (in shares)                 0  
Award vesting rights, target percentage                 100.00%  
Stock Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award requisite service period                 7 years  
Share based payment award options vesting period range start                 1 year  
Share based payment award options vesting period range end                 4 years  
Options exercisable (in shares)                 0  
Stock Plan | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Allocated share-based compensation expense                 $ 9.8  
Deferred stock-based compensation                 $ 4.5  
Share based payment award period range start                 2 years  
Share based payment award period range end                 5 years  
Awards granted (in shares)                 69,767  
Vesting period                 3 years  
LTP Program | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Allocated share-based compensation expense                 $ 7.4  
Deferred stock-based compensation                 $ 15.4  
Awards granted (in shares)                   853,111
LTP Program | Chief Executive Officer                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares withheld for withholding taxes (in shares)             30,197      
LTP Program | Chief Executive Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)         69,767   270,489      
LTP Program | Chief Executive Officer | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares) 73,986 12,690                
LTP Program | Chief Executive Officer | Performance-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares) 73,986 12,690                
Vesting period 3 years 3 years                
LTP Program | Chief Operating Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)           192,307        
Shares withheld for withholding taxes (in shares)               18,835    
Number of awards vested (in shares)     11,217              
LTP Program | First Tranche | Chief Executive Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage             20.00%      
LTP Program | First Tranche | Chief Executive Officer | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage 33.33%                  
LTP Program | First Tranche | Chief Financial Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage         33.33%          
LTP Program | First Tranche | Chief Financial Officer | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage   33.33%                
LTP Program | First Tranche | Chief Operating Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage       20.00%            
LTP Program | Second Tranche | Chief Executive Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage             80.00%      
LTP Program | Second Tranche | Chief Executive Officer | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage 33.33%                  
LTP Program | Second Tranche | Chief Financial Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage         33.33%          
LTP Program | Second Tranche | Chief Financial Officer | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage   33.33%                
LTP Program | Second Tranche | Chief Operating Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage       80.00%            
LTP Program | Third Tranche | Chief Executive Officer | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage 33.33%                  
LTP Program | Third Tranche | Chief Financial Officer | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage         33.33%          
LTP Program | Third Tranche | Chief Financial Officer | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage   33.33%                
2018 Long Term Incentive Program | Time-based and Performance-based RSU Awards                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)                 903,144  
2018 Long Term Incentive Program | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)                 451,600  
Vesting period                 3 years  
2018 Long Term Incentive Program | Performance-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period                 3 years  
2017 Long Term Incentive Program | Time-based and Performance-based RSU Awards                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)                 330,972  
2017 Long Term Incentive Program | Time-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)                 165,500  
Vesting period                 2 years  
2017 Long Term Incentive Program | Performance-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period                 2 years  
Minimum | Performance-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage                 0.00%  
Minimum | LTP Program | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period                   2 years
Maximum | Performance-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage                 150.00%  
Maximum | LTP Program | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period                   5 years