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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Allowance for doubtful accounts, trade accounts receivable (in dollars) $ 1,709 $ 1,099
Preferred stock, par value (In dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000 10,000
Series 2012-A Preferred Stock    
Designated shares 8,750 8,750
Preferred stock, shares issued 2,322 2,322
Preferred stock, shares outstanding 2,322 2,322
Class A common stock    
Common stock, par value (In dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 35,000 35,000
Common stock, shares issued 1,574 1,574
Common stock, shares outstanding 1,574 1,574
Class B common stock    
Common stock, par value (In dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 200,000 200,000
Common stock, shares issued 25,547 23,601
Common stock, shares outstanding 25,318 23,270
Treasury stock, shares 229 331