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Common Stock and Treasury Stock (Tables)
6 Months Ended
Jun. 30, 2012
Common Stock and Treasury Stock [Abstract]  
Number of common stock issued in connection with stock transactions
                 
    Common Stock Issued  
    Class A     Class B  
    (Shares in thousands)  

Balance, January 1, 2011

    4,770       598  

Conversion of shares

    1       (1
   

 

 

   

 

 

 

Balance, December 31, 2011

    4,771       597  

Conversion of shares

    —         —    
   

 

 

   

 

 

 

Balance, June 30, 2012

    4,771       597