EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2012

Reconciliation between basic and diluted earnings per share

The following table provides further share information used in computing our earnings per share for the periods presented herein. Basic earnings per share was computed by dividing net income attributable to AMCOL shareholders by the weighted average number of common shares outstanding during each period. Diluted earnings per share was computed by dividing net income attributable to AMCOL shareholders by the weighted average common shares outstanding after consideration of the dilutive effect of stock compensation awards outstanding during each period.

	Three Months Ended
	March 31,
	2012		2011
Weighted average number of common shares outstanding		31,979,894		31,515,395
Dilutive impact of stock based compensation		311,864		476,464
Weighted average number of common and common equivalent shares outstanding for the period		32,291,758		31,991,859
Number of common shares outstanding at the end of the period		31,891,418		31,466,023

Weighted average number of anti-dilutive shares excluded from the computation of diluted earnings per share		591,028		122,822