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Net Income per Share (Tables)
 6 Months Ended
Jun. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
Net income (loss) applicable to common shares
$
(71,134
)
 
$
12,039

 
$
(69,597
)
 
$
20,276

Income impact of assumed Series D Preferred Stock conversion
—

 
338

 
—

 
676

Net income (loss) after assumed Series D Preferred Stock conversion
$
(71,134
)
 
$
12,377

 
$
(69,597
)
 
$
20,952

Weighted average number of common shares outstanding
156,910

 
155,631

 
156,689

 
155,587

Effect of dilutive stock awards
—

 
879

 
—

 
942

Effect of convertible preferred stock
—

 
6,065

 
—

 
6,065

Weighted average number of diluted common shares outstanding
156,910

 
162,575

 
156,689

 
162,594

Basic net income (loss) per share
$
(0.45
)
 
$
0.08

 
$
(0.44
)
 
$
0.13

Diluted net income (loss) per share
$
(0.45
)
 
$
0.08

 
$
(0.44
)
 
$
0.13