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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Redeemable Series C Preferred Stock    
Preferred Stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred Stock, shares authorized 20,000,000 20,000,000
Preferred Stock, shares issued 3,440,690 3,440,690
Preferred Stock, shares outstanding 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 59,779,750 59,779,750
Common stock, shares issued 7,941,776 7,849,756
Common stock, shares outstanding 7,856,206 7,764,186
Treasury stock, shares 85,570 85,570
Class B    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 220,250 220,250
Common stock, shares issued 220,250 220,250
Common stock, shares outstanding 220,250 220,250