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Net Income per Share (Tables)
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Computation of basic and diluted net income per common share
The following table summarizes the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
Net income (loss) applicable to common shares
$
1,188

 
$
(71,134
)
 
$
77,167

 
$
(69,597
)
Weighted average number of common shares outstanding
164,063

 
156,910

 
163,956

 
156,689

Effect of dilutive stock awards
360

 
—

 
287

 
—

Weighted average number of diluted common shares outstanding
164,423

 
156,910

 
164,243

 
156,689

Basic net income (loss) per share
$
0.01

 
$
(0.45
)
 
$
0.47

 
$
(0.44
)
Diluted net income (loss) per share
$
0.01

 
$
(0.45
)
 
$
0.47

 
$
(0.44
)