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Compensation Plans - Stock Options (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Options Outstanding        
Beginning Balance 502,623 515,492 538,804  
Granted 0 0 0  
Exercised 0 (1,023) (2,456)  
Cancelled (16,060) (11,846) (20,856)  
Ending Balance 486,563 502,623 515,492 538,804
Options exercisable at period end 486,563 502,623 386,605  
Weighted Average Exercise Price (in dollars per share)        
Beginning Balance $ 44.71 $ 44.64 $ 44.50  
Granted $ 0.00 $ 0.00 $ 0.00  
Exercised $ 0.00 $ 39.62 $ 40.06  
Cancelled $ 43.17 $ 42.19 $ 41.89  
Ending Balance $ 44.76 $ 44.71 $ 44.64 $ 44.50
Options exercisable at period end $ 44.76 $ 44.71 $ 45.82  
Weighted Average Remaining Contractual Term (in Years)        
Weighted Average Remaining Contractual Term (in Years) 2 years 10 months 24 days 3 years 10 months 24 days 4 years 10 months 24 days 5 years 8 months 12 days
Options exercisable at period end 2 years 10 months 24 days 3 years 10 months 24 days 4 years 1 month 6 days  
Aggregate Intrinsic Value        
Aggregate Intrinsic Value of Stock Options $ 94,150.24 $ 0 $ 166,406 $ 4,237,480
Options exercisable at end of period $ 94,150.24 $ 0 $ 166,406