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STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY - TREASURY STOCK (Details) - shares
Mar. 31, 2020
Mar. 31, 2019
Class of Stock [Line Items]    
Treasury stock, Class A shares (in shares) 1,313,836 1,313,836.000
Class A common stock    
Class of Stock [Line Items]    
Treasury stock, Class A shares (in shares) 1,313,836 1,313,836