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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2013
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):

 

     2013      2012      2011  

Net income

    $ 284,501       $ 216,199       $ 147,335   
  

 

 

     

 

 

     

 

 

  

Denominator for basic earnings per share

      81,793         83,328         80,610   

Dilutive securities

      2,862         2,408         3,044   
  

 

 

     

 

 

     

 

 

  

Denominator for diluted earnings per share

      84,655         85,736         83,654   
  

 

 

     

 

 

     

 

 

  

Basic earnings per share

    $ 3.48       $ 2.59       $ 1.83   

Diluted earnings per share

      3.36         2.52         1.76