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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Redeemable Series C Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 3,440,690 3,440,690
Preferred stock, shares outstanding (in shares) 3,440,690 3,440,690
Preferred stock, liquidation value $ 17,203 $ 17,203
Class A    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 59,779,750 59,779,750
Common stock, shares issued (in shares) 8,057,989 7,953,729
Common stock, shares outstanding (in shares) 7,972,419 7,868,159
Treasury stock (in shares) 85,570 85,570
Class B    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 220,250 220,250
Common stock, shares issued (in shares) 220,250 220,250
Common stock, shares outstanding (in shares) 220,250 220,250