Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Share

Computation of Income per Common Share from Continuing Operations

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Income from continuing operations attributable to OM Group, Inc. common stockholders	$	24,709	$	13,307	$	55,601	$	35,770
Weighted average shares outstanding — basic		30,535		30,471		30,531		30,388
Dilutive effect of stock options and restricted stock		186		120		177		134
Weighted average shares outstanding — assuming dilution		30,721		30,591		30,708		30,522
Earnings per common share:
Income from continuing operations attributable to OM Group, Inc. common stockholders — basic	$	0.81	$	0.44	$	1.82	$	1.18
Income from continuing operations attributable to OM Group, Inc. common stockholders — assuming dilution	$	0.80	$	0.43	$	1.81	$	1.17

Computation of Net Income (Loss) per Common Share

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Net income attributable to OM Group, Inc. common stockholders	$	24,620	$	12,789	$	55,272	$	35,389
Weighted average shares outstanding — basic		30,535		30,471		30,531		30,388
Dilutive effect of stock options and restricted stock		186		120		177		134
Weighted average shares outstanding — assuming dilution		30,721		30,591		30,708		30,522
Earnings per common share:
Net income attributable to OM Group, Inc. common stockholders — basic	$	0.81	$	0.42	$	1.81	$	1.16
Net income attributable to OM Group, Inc. common stockholders — assuming dilution	$	0.80	$	0.42	$	1.80	$	1.16

Share-Based Compensation Awards Not Included in the Fully Diluted Computation

Three Months Ended June 30,		Six Months Ended June 30,
2011	2010	2011	2010
121	198	112	179