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Common Stock (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 21, 2020
USD ($)
item
shares
Jun. 30, 2020
shares
Jun. 30, 2019
shares
Jun. 30, 2020
shares
Jun. 30, 2019
shares
Class A Common Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Unvested restricted shares   488,503   488,503  
Class B Common Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Unvested restricted shares   528,484   528,484  
Restricted Stock [Member] | Executive Officers [Member] | Class B Common Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Number of shares granted 488,503        
Aggregate fair value on grant date | $ $ 10.2        
Number of shares vested 122,125        
Number of annual installments vested | item 4        
Restricted Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Anti-dilutive shares   1,016,981 1,022,103 1,016,981 1,022,103