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Earnings Per Share
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings (Loss) Per Share

The following table sets forth the computation of basic and dilutive income (loss) per common share from continuing operations attributable to OM Group, Inc. common stockholders:
 
 
Three Months Ended June 30
 
Six Months Ended June 30
Amounts attributable to OM Group, Inc. common stockholders:
 
2013
 
2012
 
2013
 
2012
 (in thousands, except per share amounts)
 
 
 
 
Income (loss) from continuing operations, net of tax
 
$
8,068

 
$
(22,753
)
 
$
(101,170
)
 
$
(10,685
)
 
 
 
 
 
 
 
 
 
Earnings (loss) per common share - basic:
 
 

 
 

 
 
 
 
Income (loss) from continuing operations
 
$
0.26

 
$
(0.71
)
 
$
(3.19
)
 
$
(0.34
)
 
 
 
 
 
 
 
 
 
Earnings (loss) per common share - assuming dilution:
 
 
 
 
 
 
 
 
Income (loss) from continuing operations
 
$
0.26

 
$
(0.71
)
 
$
(3.19
)
 
$
(0.34
)
 
 
 
 
 
 
 
 
 
Weighted average shares outstanding — basic
 
31,452

 
31,882

 
31,673

 
31,878

Dilutive effect of stock options and restricted stock
 
169

 
—

 
—

 
—

Weighted average shares outstanding — assuming dilution
 
31,621

 
31,882

 
31,673

 
31,878



The following table sets forth the computation of basic and diluted net income (loss) per common share attributable to OM Group, Inc. common stockholders:
 
 
Three Months Ended June 30
 
Six Months Ended June 30
Amounts attributable to OM Group, Inc. common stockholders:
 
2013
 
2012
 
2013
 
2012
 (in thousands, except per share amounts)
 
 
 
 
 
 

 
 
 
 
 
 
 
 
Net income (loss)
 
$
(3,326
)
 
$
(22,339
)
 
$
(113,040
)
 
$
(10,390
)
 
 
 
 
 
 
 
 
 
Earnings (loss) per common share - basic:
 
 
 
 
 
 
 
 
Net income (loss)
 
$
(0.11
)
 
$
(0.70
)
 
$
(3.57
)
 
$
(0.33
)
 
 
 
 
 
 
 
 
 
Earnings per common share - assuming dilution:
 
 

 
 

 
 
 
 
Net income (loss)
 
$
(0.11
)
 
$
(0.70
)
 
$
(3.57
)
 
$
(0.33
)
 
 
 
 
 
 
 
 
 
Weighted average shares outstanding — basic
 
31,452

 
31,882

 
31,673

 
31,878

Dilutive effect of stock options and restricted stock
 
169

 
—

 
—

 
—

Weighted average shares outstanding — assuming dilution
 
31,621

 
31,882

 
31,673

 
31,878



We use the treasury stock method to calculate the effect of outstanding share-based compensation awards, which requires us to compute total employee proceeds as the sum of (a) the amount the employee must pay upon exercise of the award, (b) the amount of unearned share-based compensation costs attributed to future services and (c) the amount of tax benefits, if any, that would be credited to additional paid-in capital assuming exercise of the award. Shares, under share-based compensation awards, for which the total employee proceeds exceed the average market price over the applicable period have an anti-dilutive effect on earnings per share, and accordingly, are excluded from the calculation of diluted earnings per share.

In the three months ended June 30, 2013, stock options to purchase 0.3 million shares of common stock were excluded from the calculation of dilutive earnings per share because the options’ exercise prices were greater than the average market price of the common shares and, therefore, the effect would have been anti-dilutive.