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Earnings Per Share
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Net income (loss) available to common shareholders
$
(18,471
)
 
$
80,997

 
$
(30,145
)
 
$
63,982

Weighted average common shares outstanding used to compute basic EPS
35,455

 
34,752

 
35,399

 
34,620

Dilutive effect of stock based awards
—

 
148

 
—

 
294

Weighted average common shares outstanding used to compute diluted EPS
35,455

 
34,900


35,399


34,914

Basic EPS
$
(0.52
)
 
$
2.33

 
$
(0.85
)
 
$
1.85

Diluted EPS
$
(0.52
)
 
$
2.32

 
$
(0.85
)
 
$
1.83


During the quarter and six months ended June 30, 2013, respectively, 4.3 million and 4.3 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 six months ended June 30, 2012, respectively, 5.7 million and 5.8 million of potentially issuable shares from stock awards were excluded from the calculation of diluted EPS because of their antidilutive effect.