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Share-based Compensation (Tables)
12 Months Ended
Dec. 31, 2012
Share-Based Compensation [Abstract]  
Restricted Stock Activity

The following table summarizes the restricted stock activity:

 

    Shares     Weighed-Average
Grant Date Fair Value
 
Unvested at December 31, 2011     455,256     $ 7.08  
Granted     15,770       17.46  
Vested     (313,359 )     7.07  
Forfeited     (8,000 )     6.55  
Unvested at December 31, 2012     149,667     $ 8.21