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EQUITY-BASED COMPENSATION - Stock-Settled Incentive Awards (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 13 Months Ended
May 17, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
EQUITY-BASED COMPENSATION            
offering period       3 years    
Stock-Settled Incentive Awards            
EQUITY-BASED COMPENSATION            
offering period 2 years          
Vesting date           30 days
Target amount of stock settled incentive awards granted           $ 3.9
Compensation expense   $ 0.1 $ 0.1 $ 0.3 $ 0.1  
Unrecognized compensation expense   $ 0.5   $ 0.5   $ 0.5
Stock-Settled Incentive Awards | Minimum            
EQUITY-BASED COMPENSATION            
Pay out percentage 0.00%          
Stock-Settled Incentive Awards | Maximum            
EQUITY-BASED COMPENSATION            
Pay out percentage 200.00%          
Stock-Settled Incentive Awards | Less than $20.00            
EQUITY-BASED COMPENSATION            
Percentage of Target Amount Earned           0.00%
Stock-Settled Incentive Awards | At least $20.00, but less than $25.00            
EQUITY-BASED COMPENSATION            
Percentage of Target Amount Earned           100.00%
Stock-Settled Incentive Awards | $25.00 or greater            
EQUITY-BASED COMPENSATION            
Percentage of Target Amount Earned           200.00%