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Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Numerator: |  |  |  |
Net income attributable to World Fuel | $ 48,226 | $ 51,016 | $ 98,953 | $ 99,741
Denominator: |  |  |  |
Weighted average common shares for basic earnings per common share | 70,842 | 71,516 | 70,768 | 71,483
Effect of dilutive securities (in shares) | 577 | 502 | 612 | 616
Weighted average common shares for diluted earnings per common share | 71,419 | 72,018 | 71,380 | 72,099
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares) | 660 | 468 | 655 | 461
Basic earnings per common share (in dollars per share) | $ 0.68 | $ 0.71 | $ 1.40 | $ 1.40
Diluted earnings per common share (in dollars per share) | $ 0.68 | $ 0.71 | $ 1.39 | $ 1.38

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