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Net Income per Share (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Net income (loss) applicable to common shares
$
(24,541
)
 
$
(202,096
)
 
$
52,626

 
$
(271,693
)
Weighted average number of common shares outstanding
164,149

 
157,143

 
164,021

 
156,842

Effect of dilutive stock awards
—

 
—

 
305

 
—

Weighted average number of diluted common shares outstanding
164,149

 
157,143

 
164,326

 
156,842

Basic net income (loss) per share
$
(0.15
)
 
$
(1.29
)
 
$
0.32

 
$
(1.73
)
Diluted net income (loss) per share
$
(0.15
)
 
$
(1.29
)
 
$
0.32

 
$
(1.73
)