Earnings Per Share

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Earnings Per Share

Note 2:           EARNINGS PER SHARE

The table below 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 based compensation outstanding during each period.

	Nine Months Ended September 30,				Three Months Ended September 30,
	2011		2010		2011		2010
Weighted average number of common shares outstanding		31,671,781		31,136,740		31,799,536		31,225,430
Dilutive impact of stock based compensation		455,777		361,286		393,922		339,698
Weighted average number of common and common equivalent shares outstanding for the period		32,127,558		31,498,026		32,193,458		31,565,128
Number of common shares outstanding at the end of the period		31,666,904		31,100,692		31,666,904		31,100,692
Weighted average number of anti-dilutive shares excluded from the computation of diluted earnings per share		186,929		570,259		218,800		511,792