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Earnings Per Common Share (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Common Share [Abstract]  
Numerator and denominator of the basic and diluted earnings per common share computations
                                 
    Three Months Ended
June  30,
    Six Months Ended
June  30,
 
    2012     2011     2012     2011  
    (In thousands, except per share data)  

Numerator for both basic and diluted earnings per common share, net income

  $ 13,866     $ 11,033     $ 26,240     $ 20,221  
   

 

 

   

 

 

   

 

 

   

 

 

 
         

Denominator for basic earnings per common share, weighted average common shares outstanding

    27,493       27,454       27,486       27,453  

Weighted average common stock equivalents

    84       43       72       37  
   

 

 

   

 

 

   

 

 

   

 

 

 

Denominator for diluted earnings per common share

    27,577       27,497       27,558       27,490  
   

 

 

   

 

 

   

 

 

   

 

 

 
         

Basic earnings per common share

  $ 0.50     $ 0.40     $ 0.95     $ 0.74  

Diluted earnings per common share

    0.50       0.40       0.95       0.74