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STOCK-BASED COMPENSATION - NARRATIVE (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2017
2017 LTIP    
STOCK-BASED COMPENSATION    
Shares reserved for future issuance (in shares)   2,467,430
2017 LTIP | Performance stock units | Minimum    
STOCK-BASED COMPENSATION    
Ratio at which award holders get common stock of the company 0  
2017 LTIP | Performance stock units | Maximum    
STOCK-BASED COMPENSATION    
Ratio at which award holders get common stock of the company 2  
2021 LTIP    
STOCK-BASED COMPENSATION    
Shares reserved for future issuance (in shares) 700,000  
LTIP    
STOCK-BASED COMPENSATION    
Granted (in shares) 0  
Exercised in period, aggregate intrinsic value $ 0.1  
LTIP | Restricted stock units    
STOCK-BASED COMPENSATION    
Number of shares released upon vesting (in shares) 1  
Vesting period 3 years  
Granted (in shares) 175,549  
Granted, fair value $ 6.0  
LTIP | Restricted stock units | 2019    
STOCK-BASED COMPENSATION    
Vesting percent of shares 33.00%  
LTIP | Restricted stock units | 2020    
STOCK-BASED COMPENSATION    
Vesting percent of shares 33.00%  
LTIP | Restricted stock units | 2021    
STOCK-BASED COMPENSATION    
Vesting percent of shares 33.00%  
LTIP | Performance stock units    
STOCK-BASED COMPENSATION    
Vesting period 3 years  
Granted (in shares) 64,258  
Granted, fair value $ 4.4  
Number of trading days 30 days  
LTIP | Performance stock units | Minimum    
STOCK-BASED COMPENSATION    
Ratio at which award holders get common stock of the company 0  
LTIP | Performance stock units | Maximum    
STOCK-BASED COMPENSATION    
Ratio at which award holders get common stock of the company 2  
LTIP | Stock options    
STOCK-BASED COMPENSATION    
Expiration period 10 years  
Granted (in shares) 0