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EARNINGS (LOSS) PER SHARE
 3 Months Ended
Mar. 31, 2012
Earnings Per Share, Basic and Diluted [Abstract]  
EARNINGS (LOSS) PER SHARE
EARNINGS (LOSS) PER SHARE

The computation of basic and diluted earnings (loss) per common share was as follows (in thousands, except per share data):
 
Three Months Ended March 31,
 
2012
 
2011
Amounts attributable to Quest Diagnostics’ stockholders:
 

 
 

Income (loss) from continuing operations
$
158,844

 
$
(53,487
)
Income (loss) from discontinued operations, net of taxes
274

 
(374
)
Net income (loss) attributable to Quest Diagnostics’ common stockholders
$
159,118

 
$
(53,861
)
 
 
 
 
Income (loss) from continuing operations
$
158,844

 
$
(53,487
)
Less: Earnings allocated to participating securities
604

 
90

Earnings (loss) available to Quest Diagnostics’ common stockholders – basic and diluted
$
158,240

 
$
(53,577
)
 
 
 
 
Weighted average common shares outstanding – basic
158,293

 
161,489

Effect of dilutive securities:
 

 
 

Stock options and performance share units
1,413

 
—

Weighted average common shares outstanding – diluted
159,706

 
161,489

 
 
 
 
Earnings (loss) per share attributable to Quest Diagnostics’ common stockholders – basic:
 

 
 

Income (loss) from continuing operations
$
1.00

 
$
(0.33
)
Income (loss) from discontinued operations
—

 
—

Net income (loss)
$
1.00

 
$
(0.33
)
 
 
 
 
Earnings (loss) per share attributable to Quest Diagnostics’ common stockholders – diluted:
 

 
 

Income (loss) from continuing operations
$
0.99

 
$
(0.33
)
Income (loss) from discontinued operations
—

 
—

Net income (loss)
$
0.99

 
$
(0.33
)


The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect (shares in thousands):
 
Three Months Ended March 31,
 
2012
 
2011
Stock options and performance share units
1,995

 
3,746