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Net Income (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Computation of basic and diluted net income (loss) 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):
 
Years Ended December 31,
 
2012
 
2011
 
2010
Net income (loss) applicable to common shares
$
61,963

 
$
23,422

 
$
(38,774
)
Income impact of assumed Series D Preferred Stock conversion
1,352

 
—

 
—

Net income after assumed Series D Preferred Stock conversion
$
63,315

 
$
23,422

 
$
(38,774
)
Weighted average number of common shares outstanding
155,801

 
154,811

 
144,278

Effect of dilutive stock awards
899

 
1,279

 
—

Effect of Series D Preferred Stock
6,065

 
—

 
—

Weighted average number of diluted common shares outstanding
162,765

 
156,090

 
144,278

Basic net income (loss) per share
$
0.40

 
$
0.15

 
$
(0.27
)
Diluted net income (loss) per share
$
0.39

 
$
0.15

 
$
(0.27
)