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Income Per Share (Tables)
3 Months Ended
Mar. 31, 2012
Income Per Share [Abstract]  
Weighted average number of common shares outstanding
                 
    Three Months Ended March 31,  
    2012     2011  

Weighted average shares outstanding

    48,715       48,221  

Effect of dilutive stock-based compensation

    608       —    

Effect of convertible notes

    814       —    
   

 

 

   

 

 

 

Weighted average shares outstanding - assuming dilution

    50,137       48,221