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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Allowance for doubtful accounts $ 3,624 $ 3,443
Preferred stock, par value (USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 25,000,000 25,000,000
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (USD per share) $ 0.01 $ 0.01
Series A preferred stock    
Preferred stock, par value (USD per share) $ 100,000  
Preferred stock, shares outstanding (in shares) 6,000  
Common stock, Class A    
Common stock, shares authorized 240,000,000 240,000,000
Common stock, shares issued (in shares) 70,591,607 69,794,917
Common stock, shares outstanding (in shares) 70,591,607 69,794,917
Voting common stock    
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares issued (in shares) 11,932,722 11,932,722
Common stock, shares outstanding (in shares) 11,932,722 11,932,722