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Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Numerator:
Net income attributable to World Fuel	$ 46,415	$ 41,109
Denominator:
Weighted average common shares for basic earnings per common share	70,998	69,970
Effect of dilutive securities (in shares)	776	1,012
Weighted average common shares for diluted earnings per common share	71,774	70,982
Weighted average anti-dilutive securities which are not included in the calculation of diluted earnings per common share (in shares)	54
Basic earnings per common share (in dollars per share)	$ 0.65	$ 0.59
Diluted earnings per common share (in dollars per share)	$ 0.65	$ 0.58

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