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Earnings Per Share
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2013 and June 30, 2012:

  Three Months Ended  Six Months Ended
   June 30,   June 30,
  2013 2012 2013 2012
Basic earnings per common share           
 Net income attributable to Quaker Chemical Corporation$ 16,083  $11,108 $ 29,702  $23,473
 Less: income allocated to participating securities (139)  (106)  (249)  (302)
 Net income available to common shareholders$ 15,944 $11,002 $ 29,453 $23,171
 Basic weighted average common shares outstanding 13,037,822  12,850,917  13,019,991  12,790,799
Basic earnings per common share$1.22 $0.86 $2.26 $1.81
             
Diluted earnings per common share           
 Net income attributable to Quaker Chemical Corporation$16,083 $11,108 $29,702 $23,473
 Less: income allocated to participating securities (138)  (106)  (248)  (301)
 Net income available to common shareholders$15,945 $11,002 $29,454 $23,172
 Basic weighted average common shares outstanding 13,037,822  12,850,917  13,019,991  12,790,799
 Effect of dilutive securities and employee stock options 24,918  80,913  27,314  88,838
 Diluted weighted average common shares outstanding 13,062,740  12,931,830  13,047,305  12,879,637
Diluted earnings per common share$1.22 $0.85 $2.26 $1.80

The following number of stock options are not included in diluted earnings per share since the effect would have been anti-dilutive: 6,170 and 9,917 for the three months ended June 30, 2013 and June 30, 2012, respectively, and 4,520 and 7,859 for the six months ended June 30, 2013 and June 30, 2012, respectively.