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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Summary of Earnings Per Share, Basic and Diluted

The calculation and reconciliation of basic and diluted earnings per share for the three months ended June 30 (in thousands, except per share data) follows:

 

     Three Months Ended
June 30,		      Six Months Ended
June 30,		  
     2015      2014      2015      2014  

Net income

    $ 98,678       $ 88,549       $ 192,831       $ 163,658   
  

 

 

     

 

 

     

 

 

     

 

 

  

Denominator for basic and diluted earnings per share:

            

Denominator for basic earnings per share

      91,904         82,996         91,828         82,867   

Dilutive securities

      2,146         2,821         2,164         2,890   
  

 

 

     

 

 

     

 

 

     

 

 

  

Denominator for diluted earnings per share

      94,050         85,817         93,992         85,757   
  

 

 

     

 

 

     

 

 

     

 

 

  

Basic earnings per share

    $ 1.07       $ 1.07       $ 2.10       $ 1.97   

Diluted earnings per share

    $ 1.05       $ 1.03       $ 2.05       $ 1.91