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Compensation Plans - Stock Options (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Options Outstanding    
Beginning Balance 486,563  
Granted 0  
Exercised 0  
Cancelled (16,498)  
Ending Balance 470,065 486,563
Options exercisable at period end 470,065  
Weighted Average Exercise Price (in dollars per share)    
Beginning Balance $ 44.76  
Granted $ 0.00  
Exercised $ 0.00  
Cancelled $ 42.91  
Ending Balance $ 44.82 $ 44.76
Options exercisable at period end $ 44.82  
Weighted Average Remaining Contractual Term (in Years)    
Weighted Average Remaining Contractual Term (in Years) 2 years 2 months 12 days 2 years 10 months 24 days
Options exercisable at period end 2 years 2 months 12 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value of Stock Options $ 147,071 $ 94,150
Options exercisable at end of period $ 147,071