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Stock-Based Compensation
6 Months Ended
Jun. 30, 2011
Stock-Based Compensation [Abstract]  
Stock-Based Compensation
9. Stock-Based Compensation
     The following table summarizes the Company’s restricted stock activity for the six months ended June 30, 2011:
                 
            Weighted-  
    Number of     Average Fair  
    Shares     Value  
Outstanding as of January 1, 2011
    0.192     $ 12.61  
Shares granted
    0.306       13.80  
Shares vested
    (0.002 )     12.48  
Shares forfeited
    (0.004 )     12.89  
 
             
Outstanding as of June 30, 2011
    0.492     $ 13.15