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Stock Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Stock-Based Compensation [Abstract]  
Summary the stock option transactions

The following summarizes the stock option transactions for the 2005 and 2003 Plans for the three months ended March 31, 2013:

 

                Weighted Average        
                Remaining     Aggregate  
    Number of     Weighted Average     Contractual Term     Intrinsic  
    Options     Exercise Price     (Years)     Value  
Outstanding at January 1, 2013     260,660     $ 34.69       3.0     $ 1,253,039  
Exercised     (3,486 )     28.47                  
Outstanding at March 31, 2013     257,174     $ 34.77       2.7     $ 3,287,930  
Exercisable at March 31, 2013     257,174     $ 34.77       2.7     $ 3,287,930
Summary of restricted stock transactions

The following summarizes the restricted stock transactions for the three months ended March 31, 2013:

 

          Weighted Average  
          Grant Date Fair  
    Shares     Value  
Outstanding at January 1, 2013     5,531     $ 17.97  
Vested     (5,531 )     17.97  
Non-vested and outstanding at March 31, 2013   —     $ —