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Common Stock and Treasury Stock (Tables)
3 Months Ended
Mar. 31, 2013
Stockholders' Equity Note [Abstract]  
Schedule of Stock by Class

The following summarizes information relating to the number of shares of our common stock issued in connection with stock transactions through March 31, 2013:

 

    Common Stock Issued  
    Class A     Class B  
    (Shares in thousands)  
Balance, January 1, 2012     6,360       797  
Exercised options     10        
Balance, December 31, 2012     6,370       797  
Exercised options     3        
Conversion of shares     1       (1 )
Balance, March 31, 2013     6,374       796