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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]  
Summary of weighted average number of common shares outstanding
      September 30,       September 30,       September 30,  
    Year Ended December 31,  
    2011     2010     2009  

Denominator:

                        

Basic common shares outstanding

     44,631       45,722       45,184  

Effect of dilutive stock options and restricted stock

     474       674       319  
   

 

 

    

 

 

    

 

 

  

Diluted common shares outstanding

     45,105       46,396       45,503