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STOCKHOLDERS' AND MEMBERS' EQUITY STRUCTURE Treasury Stock (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Aug. 19, 2014
Class of Stock [Line Items]      
Treasury Stock, Shares 6,549,449 6,424,787  
Treasury Stock, Value $ 167,300,000 $ 165,700,000  
Class A Common Stock [Member]      
Class of Stock [Line Items]      
Stock Repurchase Program, Authorized Amount     $ 300,000,000.0
Repurchase Program [Member] | Class A Common Stock [Member]      
Class of Stock [Line Items]      
Treasury Stock, Shares 6,050,717    
Treasury Stock, Value $ 150,800,000