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EQUITY-BASED COMPENSATION - Equity Options (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Price     $ 20.50
Equity options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 0.2 $ 4.3 $ 5.2
Class A Common Stock | Equity options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Price $ 4.10 $ 9.28