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Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income attributable to World Fuel	$ 48,725	$ 46,415
Denominator:
Weighted average common shares for basic earnings per common share	71,288	70,998
Effect of dilutive securities (in shares)	711	776
Weighted average common shares for diluted earnings per common share	71,999	71,774
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares)	763	54
Basic earnings per common share (in dollars per share)	$ 0.68	$ 0.65
Diluted earnings per common share (in dollars per share)	$ 0.68	$ 0.65

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