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Equity-Based Compensation Plans (Details 3) (Restricted Stock [Member], USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock [Member]
   
Summary of restricted Stock activity    
Number of Restricted Shares, Beginning balance 377,750  
Weighted Average Exercise Price, Beginning balance $ 25.30  
Number of Restricted Shares, Granted 0  
Weighted Average Exercise Price, Granted $ 0  
Number of Restricted Shares, Exercised 0  
Weighted Average Exercise Price, Exercised $ 0  
Number of Performance Share Units, Cancelled (13,100)  
Weighted Average Exercise Price, Cancelled $ 26.58  
Number of Performance Share Units, Ending balance 364,650  
Weighted Average Exercise Price, Ending balance $ 25.25  
Aggregate Intrinsic Value, Ending Balance $ 3,664,733 $ 2,500,000