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EQUITY-BASED COMPENSATION - OCGH Unit Awards (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 33 Months Ended
Mar. 31, 2018
Mar. 31, 2020
USD ($)
company
$ / shares
shares
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2017
Sep. 30, 2018
OCGH Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of units granted (in shares)   0        
Unrecognized compensation expense on non-vested equity-based awards | $   $ 30.5        
Weighted average period of recognition non-vested equity-based awards   3 years 2 months 12 days        
Estimated liquidity period (in years) 7 years   6 years 4 months 24 days   5 years 9 months 18 days  
Share exchange rate   1        
Discount percentage       17.50%   20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Comparable Companies Used in Volatility Calculation | company   5        
Class A Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of units granted (in shares)   0        
Share exchange rate   1        
Converted Class A Units and Phantom Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Valuation assumptions, price per unit (in usd per share) | $ / shares   $ 49.00