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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Calculation of Weighted Average Common Shares Outstanding used in Computation of Diluted Earnings Per Share
The following table summarizes the calculation of weighted average common shares outstanding used in the computation of diluted earnings per share, for the years ended December 31 (in thousands):
 
2012
 
2011
 
2010
Weighted average basic common shares outstanding
453,595

 
398,851

 
291,869

Effect of dilutive securities
 
 
 
 
 
Restricted stock
2,420

 
7,794

 
5,057

Convertible preferred stock

 

 
18,423

Weighted average diluted common and potential common shares outstanding
456,015

 
406,645

 
315,349