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EQUITY-BASED COMPENSATION - Share-repurchases (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Decrease in paid-in capital $ 10,876,000 $ 18,600,000 $ 16,562,000
2016 plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares repurchased in open market 1,989,440 2,180,806  
Number of shares repurchased with employee minimum tax withholding requirements 210,384 108,074  
Decrease in paid-in capital $ 12,300,000    
Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares repurchased in open market 2,199,824 2,288,880 1,766,428
Decrease in paid-in capital $ 22,000 $ 23,000 $ 17,000
Class A Common Stock | 2016 plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Decrease in Class A common stock $ 22,000