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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 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 years ended December 31 (in thousands, except per share data) follows:

 

     2015      2014      2013  

Net income

    $ 362,431       $ 368,707       $ 284,501   
  

 

 

     

 

 

     

 

 

  

Denominator for basic earnings per share

      92,023         84,317         81,793   

Dilutive securities

      2,116         2,665         2,862   
  

 

 

     

 

 

     

 

 

  

Denominator for diluted earnings per share

      94,139         86,982         84,655   
  

 

 

     

 

 

     

 

 

  

Basic earnings per share

    $ 3.94       $ 4.37       $ 3.48   

Diluted earnings per share

      3.85         4.24         3.36