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EQUITY-BASED COMPENSATION - Share-repurchases (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
2016 plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares repurchased in open market 849,711 82,092
Number of shares repurchased with employee minimum tax withholding requirements 129,680 43,694
Decrease in paid in-capital $ 6.6  
Class A Common Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Decrease in Class A common stock 10,000