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Earnings Per Share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Earnings Per Share
7. EARNINGS PER SHARE

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

 

    Year ended December 31  

In thousands, except per share

     2014        2013        2012   

Net income

   $ 69,246      $ 67,158      $ 59,379   

Weighted average common shares outstanding used in basic EPS

     43,201        43,158        42,851   

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

     865        1,141        821   

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

     44,066        44,299        43,672   

Earnings per share

      

Basic

   $ 1.60      $ 1.56      $ 1.39   

Diluted

     1.57        1.52        1.36   

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  

In thousands

     2014        2013        2012   

Potential common shares

     277        7        8