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CONDENSED CONSOLIDATED BALANCE SHEETS [Parenthetical] (USD $)
Mar. 31, 2013
Dec. 31, 2012
Redeemable preferred stock, par value (in dollars per share) $ 0.6 $ 0.6
Redeemable preferred stock, authorized 200,000 200,000
Redeemable preferred stock, issued 29,761 30,265
Redeemable preferred stock, outstanding 29,761 30,265
Class A Common Stock [Member]
    
Common stock, par value (in dollars per share) $ 0.6 $ 0.6
Common stock, authorized 24,655,000 24,655,000
Common stock, issued 14,633,602 14,593,011
Common stock, outstanding 14,633,602 14,593,011
Class B Common Stock [Member]
    
Common stock, par value (in dollars per share) $ 0.6 $ 0.6
Common stock, authorized 145,000 145,000
Common stock, issued 0 0
Common stock, outstanding 0 0