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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2014
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted earnings per share:

   
Three Months Ended
 
   
March 31
 
(in thousands except per share data)
 
2014
  
2013
 
Numerator:
      
Net income
 $10,140  $11,820 
          
Denominator:
        
Basic earnings per share:
        
Weighted average shares
  15,735   15,539 
Diluted earnings per share:
        
Effect of dilutive stock options and restricted stock grants
  86   53 
Adjusted weighted average shares
  15,821   15,592 
          
Earnings per share:
        
Basic earnings per share
 $0.64  $0.76 
Diluted earnings per share
  0.64   0.76