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Earnings Per Share
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings (Loss) Per Share
Basic net income (loss) per share (EPS) is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income (loss) by the weighted average number of common and dilutive potential common shares outstanding during the period. Basic and diluted EPS (in thousands, except per share amounts):
 
 
Quarters Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Net income (loss) available to common shareholders
$
(31,375
)
 
$
(22,214
)
 
$
(61,520
)
 
$
41,768

Weighted average common shares outstanding used to compute basic EPS
35,670

 
34,998

 
35,490

 
34,747

Dilutive effect of stock based awards
—

 
—

 
—

 
253

Weighted average common shares outstanding used to compute diluted EPS
35,670

 
34,998


35,490


35,000

Basic EPS
$
(0.88
)
 
$
(0.63
)
 
$
(1.73
)
 
$
1.20

Diluted EPS
$
(0.88
)
 
$
(0.63
)
 
$
(1.73
)
 
$
1.19


During the quarter and nine months ended September 30, 2013, respectively, 4.6 million and 4.4 million of potentially issuable shares from stock awards were excluded from the calculation of diluted EPS because of their antidilutive effect.
During the quarter and nine months ended September 30, 2012, respectively, 4.3 million and 5.3 million of potentially issuable shares from stock awards were excluded from the calculation of diluted EPS because of their antidilutive effect.