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Earnings Per Share (Tables)
6 Months Ended
Jun. 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
   
Six Months Ended
 
(shares in thousands)
 
June 30,
   
June 30,
 
   
2013
   
2012
   
2013
   
2012
 
Basic earnings per share
    4,866       4,862       4,864       4,862  
Diluted earnings per share
    4,870       4,862       4,870       4,862