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EQUITY-BASED COMPENSATION - Performance share units (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of times shares issued for each performance share settlement | $ / shares 1    
Grant date fair value of PSUs $ 4,400,000 $ 7,000,000.0 $ 5,900,000
Compensation expense (1,700,000) $ 2,100,000 $ 500,000
Unrecognized compensation expense $ 2,200,000    
Weighted-average remaining life 2 years    
Performance share units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of times shares issued for each performance share settlement 0    
Percentage of Target PSUs Earned 0.00%    
Percentage of Target Amount Earned 0.00%    
Performance share units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of times shares issued for each performance share settlement 1.75    
Percentage of Target PSUs Earned 1.75%    
Return on assets Less than 9.6% | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target PSUs Earned 0.00%    
Return on assets 9.6% | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target PSUs Earned 50.00%    
Return on assets 12% | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target PSUs Earned 100.00%    
Return on assets 14.4% | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target PSUs Earned 175.00%    
Peer Group Outside of Top 10 | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 0.00%    
Peer Group Top 10 | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 50.00%    
Peer Group Top 7 | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 100.00%    
Peer Group Top 3 | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 175.00%    
Adjusted FCF Performance Percentage Less than 70% | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 0.00%    
Adjusted FCF Performance Percentage 70% | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 50.00%    
Adjusted FCF Performance Percentage 100% | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 100.00%    
Adjusted FCF Performance Percentage 130% | Performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 175.00%    
Return On Assets Five Percent [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Target Amount Earned 5.00%