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Common Stock (Details)
$ in Millions
3 Months Ended
Jan. 21, 2020
USD ($)
item
shares
Mar. 31, 2020
shares
Mar. 31, 2019
shares
Restricted Stock [Member] | Executive Officers [Member] | Class B Common Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Number of shares granted 2,442,503    
Aggregate fair value on grant date | $ $ 10.2    
Number of shares vested 611,000    
Number of annual installments vested | item 4    
Restricted Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Anti-dilutive shares   5,084,906 0