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EQUITY-BASED COMPENSATION - OCGH Unit Awards (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Mar. 31, 2018
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 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]              
Granted (in shares) | shares   150,000 150,000        
Unrecognized compensation expense on non-vested equity-based awards | $   $ 27.5 $ 27.5        
Weighted average period of recognition non-vested equity-based awards     3 years 1 month 6 days        
Estimated liquidity period (in years) 7 years     6 years 4 months 24 days   5 years 9 months 18 days  
Number of comparable companies used in volatility calculation | company     5        
Discount percentage         17.50%   20.00%
Grant date, fair value per unit (in dollars per share)     $ 32.93        
OCGH Units | Class A Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share exchange rate   1 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)   $ 49.00 $ 49.00