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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Summary of average number of shares used in the computation of basic and diluted earnings per share
 
Three Months Ended
  
Nine Months Ended
 
(shares in thousands)
 
September 30,
  
September 30,
 
   
2013
  
2012
  
2013
  
2012
 
Basic earnings per share
  4,867   4,862   4,865   4,862 
Diluted earnings per share
  4,881   4,862   4,877   4,862