Earnings Per Share

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

EARNINGS PER SHARE

Note 2:          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