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Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Numerator: |  |  |  |
Net income attributable to World Fuel (in dollars) | $ 52,655 | $ 36,755 | $ 143,967 | $ 107,435
Denominator: |  |  |  |
Weighted average common shares for basic earnings per common share | 70,939 | 60,496 | 70,593 | 59,768
Effect of dilutive securities (in shares) | 648 | 1,167 | 822 | 1,217
Weighted average common shares for diluted earnings per common share | 71,587 | 61,663 | 71,415 | 60,985
Weighted average anti-dilutive securities which are not included in the calculation of diluted earnings per common share (in shares) | 119 | 222 | 85 | 268
Basic earnings per common share (in dollars per share) | $ 0.74 | $ 0.61 | $ 2.04 | $ 1.80
Diluted earnings per share (in dollars per share) | $ 0.74 | $ 0.60 | $ 2.02 | $ 1.76

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