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Consolidated Balance Sheets (Parenthetical) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Class A Common Stock [Member]
      
Common stock, par value $ 1 $ 1 [1] $ 1 [2]
Common stock, shares issued 8,756,778 8,756,778 [1] 8,756,778 [2]
Common stock, shares outstanding 8,756,778 8,756,778 [1] 8,756,778 [2]
Class B Common Stock [Member]
      
Common stock, par value $ 1 $ 1 [1] $ 1 [2]
Common stock, shares issued 1,639,987 1,677,675 [1] 1,677,675 [2]
Common stock, shares outstanding 1,639,987 1,677,675 [1] 1,677,675 [2]
[1] Derived from the 2010 Annual Report on Form 10-K.
[2] Unaudited