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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Summary of average number of shares used in the computation of basic and diluted earnings per share

  
Three Months Ended
  
Six Months Ended
 
(shares in thousands)
 
June 30,
  
June 30,
 
  
2014
  
2013
  
2014
  
2013
 
Basic earnings per share
  4,875   4,866   4,873   4,864 
Diluted earnings per share
  4,893   4,870   4,894   4,870