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Earnings per Share ("EPS")
 12 Months Ended
Dec. 31, 2011
Earnings per Share ("EPS")  
Earnings per Share ("EPS")

(11) Earnings per Share ("EPS")

        Basic EPS is calculated by dividing net income by the weighted average number of common shares outstanding. The computation of diluted EPS assumes the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. The calculation of the basic EPS and the diluted EPS for the years ended December 31, 2011, 2010, and 2009 is set forth in the following table:

 
   Net Income
(Numerator) 		  Shares
(Denominator) 		  Per Share
Amount 		 
 
   (Dollars in Thousands,
Except Per Share Amounts)
  

December 31, 2011:

                    

Basic EPS

                    

Net income available to common shareholders

   $ 113,869     67,506,554   $ 1.69  

Potential dilutive common shares

    
—		    
62,914		        
                 

Diluted EPS

   $ 113,869     67,569,468   $ 1.69  
                 

December 31, 2010:

                    

Basic EPS

                    

Net income available to common shareholders

   $ 116,897     67,921,353   $ 1.72  

Potential dilutive common shares

    
—		    
83,088		        
                 

Diluted EPS

   $ 116,897     68,004,441   $ 1.72  
                 

December 31, 2009:

                    

Basic EPS

                    

Net income

   $ 129,758     68,373,732   $ 1.90  

Potential dilutive common shares

    
—		    
20,892		        
                 

Diluted EPS

   $ 129,758     68,394,624   $ 1.90