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Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2012
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

 

    Shares
Outstanding
    Weighted Average
Grant Date
Fair Value
 
Unvested restricted stock at January 1, 2012     216,920     $ 21.74  
Restricted stock granted     94,850       24.40  
Restricted stock vested     (53,820 )     21.89  
Restricted stock forfeited     (5,720 )     24.32  
Unvested restricted stock at June 30, 2012     252,230     $ 22.65