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Net Income Per Common Share (Tables)
6 Months Ended
Jun. 30, 2012
Net Income Per Common Share [Abstract]  
Summary of weighted average number of common shares outstanding
                                 
    Three Months Ended
June  30,
    Six Months Ended
June 30,
 
    2012     2011     2012     2011  

Denominator:

                               

Basic common shares outstanding

    44,447       44,658       44,410       45,122  

Effect of dilutive stock options and restricted stock

    722       360       751       429  
   

 

 

   

 

 

   

 

 

   

 

 

 

Diluted common shares outstanding

    45,169       45,018       45,161       45,551