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Stockholders' Equity
 12 Months Ended
Dec. 31, 2011
Stockholders' Equity [Abstract]  
Stockholders' Equity

Note 15.    Stockholders' Equity

 

    Common Stock
     Treasury Stock
  

(number of shares in thousands)

   2011
     2010
     2009
     2011
     2010
     2009
  

At January 1

     29,555        29,555        29,555        5,851        5,890        5,956   

Exercise of options

     0        0        0        (236 )      (186 )      (68 ) 

Stock purchases

     0        0        0        1,087        147        2   

Settlement of NewMarket Corporation civil complaint

     0        0        0        (195 )      0        0   
   
 
 
 
 
 

At December 31

     29,555        29,555        29,555        6,507        5,851        5,890   
   
 
 
 
 
 

At December 31, 2011, the Company had authorized common stock of 40,000,000 shares (2010 – 40,000,000). Issued shares at December 31, 2011, were 29,554,500 (2010 – 29,554,500) and treasury stock amounted to 6,507,081 shares (2010 – 5,851,298).