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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Allowance for doubtful accounts, trade accounts receivable (in dollars) $ 130 $ 130
Preferred stock, par value (In dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 1,917 1,605
Preferred stock, shares outstanding 1,917 1,605
Series 2012-A Preferred Stock
    
Designated shares 8,750 8,750
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 19,685 19,827
Common stock, shares outstanding 19,626 19,800
Treasury stock, shares 59 27