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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 25, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 20, 2018
Accounts receivable, allowances $ 6,492   $ 7,274 $ 7,611  
Class A Common Stock          
Common Stock, par value $ 0.01   $ 0.01 $ 0.01  
Common stock shares authorized (up to) (in shares) 100,000,000 100,000,000 320,000,000 320,000,000 320,000,000
Common Stock, shares issued 11,601,757   11,601,757 11,601,757  
Class B Common Stock          
Common Stock, par value $ 0.01   $ 0.01 $ 0.01  
Common stock shares authorized (up to) (in shares) 1,800,000,000 1,800,000,000 600,000,000 600,000,000 600,000,000
Common Stock, shares issued 250,625,279   243,241,192 238,681,756