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Earnings Per Share
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]

Note 11 – Earnings Per Share

The following table summarizes earnings per share calculations for the three and nine months ended September 30, 2018 and 2017:

Three Months Ended Nine Months Ended
September 30, September 30,
2018201720182017
Basic earnings per common share
Net income attributable to Quaker Chemical Corporation$ 19,690$11,142$ 51,668$30,040
Less: income allocated to participating securities (77) (76) (226) (222)
Net income available to common shareholders$ 19,613$11,066$ 51,442$29,818
Basic weighted average common shares outstanding13,278,25913,217,16513,263,41713,196,255
Basic earnings per common share$1.48$0.84$3.88$2.26
Diluted earnings per common share
Net income attributable to Quaker Chemical Corporation$19,690$11,142$51,668$30,040
Less: income allocated to participating securities(77)(76)(226)(222)
Net income available to common shareholders$19,613$11,066$51,442$29,818
Basic weighted average common shares outstanding13,278,25913,217,16513,263,41713,196,255
Effect of dilutive securities37,28234,52833,92841,818
Diluted weighted average common shares outstanding13,315,54113,251,69313,297,34513,238,073
Diluted earnings per common share$1.47$0.83$3.87$2.25

Certain stock options and restricted stock units are not included in the diluted earnings per share calculation since the effect would have been anti-dilutive. The calculated amount of anti-diluted shares not included were 718 and 3,480 for the three and nine months ended September 30, 2018, respectively, and 4,300 and 4,819 for the three and nine months ended September 30, 2017, respectively.