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Earnings Per Share
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]

Note 7 – Earnings Per Share

The following table summarizes earnings per share calculations for the three months ended March 31, 2013 and March 31, 2012:

   Three Months Ended March 31, 
   2013 2012 
 Basic earnings per common share      
         
  Net income attributable to Quaker Chemical Corporation$ 13,619  $12,365 
  Less: income allocated to participating securities (111)  (200) 
  Net income available to common shareholders$ 13,508 $12,165 
  Basic weighted average common shares outstanding 13,001,963  12,730,682 
         
 Basic earnings per common share$1.04 $0.96 
         
 Diluted earnings per common share      
         
  Net income attributable to Quaker Chemical Corporation$13,619 $12,365 
  Less: income allocated to participating securities (111)  (198) 
  Net income available to common shareholders$13,508 $12,167 
  Basic weighted average common shares outstanding 13,001,963  12,730,682 
  Effect of dilutive securities 29,937  121,210 
  Diluted weighted average common shares outstanding 13,031,900  12,851,892 
         
 Diluted earnings per common share$1.04 $0.95 

The following number of stock options and restricted stock units are not included in the diluted earnings per share calculation since the effect would have been anti-dilutive: 2,444 and 20,178 for the three months ended March 31, 2013 and March 31, 2012, respectively.