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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Details of Basic and Diluted Earnings Per Share (EPS)

The following table sets forth the details of basic and diluted earnings per share (EPS):

 

    Year ended December 31  

In thousands, except per share

     2013        2012        2011   

Net income

   $ 67,158      $ 59,379      $ 42,694   

Weighted average common shares outstanding used in basic EPS

     43,158        42,851        45,228   

Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs

     1,141        821        566   

Weighted average common shares outstanding and common share equivalents used in diluted EPS

     44,299        43,672        45,794   

Earnings per share

        

Basic

   $ 1.56      $ 1.39      $ 0.94   

Diluted

     1.52        1.36        0.93   
Number of Potential Common Shares that have been Excluded from Computation of Diluted Earnings Per Share for Indicated Period Due to Their Anti-Dilutive Nature

The following table sets forth the potential common shares outstanding for stock options and restricted stock units that were not included in the computation of diluted EPS for the period indicated, because their effect would be anti-dilutive:

 

        Year ended December 31  
      2013        2012        2011   

Potential common shares

     7        8        891