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Earnings Per Common Share And Share Awards (Summary Of Share-Based Award Transactions) (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Common Share And Share Awards [Abstract]      
Number Of Shares, Outstanding Beginning Balance 101,600 110,800  
Number Of Shares, SARs granted 3,000 3,000  
Number Of Shares, Options exercised (6,130) (7,700)  
Number Of Shares, Options/SARs cancelled/forfeited/expired (70) (4,500)  
Number Of Shares, Outstanding Ending Balance 98,400 101,600 110,800
Number Of Shares, Exercisable as of September 30, 2012 96,600    
Number Of Shares, Unvested as of September 30, 2012 1,800    
Weighted Average Exercise Price, Outstanding Beginning Balance $ 29.81 $ 28.77  
Weighted Average Exercise Price, SARs granted $ 50.50 $ 41.50  
Weighted Average Exercise Price, Options exercised $ 24.93 $ 20.15  
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired $ 31.00 $ 28.61  
Weighted Average Exercise Price, Outstanding Ending Balance $ 30.74 $ 29.81 $ 28.77
Weighted Average Exercise Price, Exercisable as of September 30, 2012 $ 30.43    
Weighted Average Exercise Price, Unvested as of September 30, 2012 $ 47.27    
Average Remaining Contractual Term, Outstanding Beginning Balance 3 years 5 months 1 day 3 years 10 months 28 days 4 years 6 months 4 days
Average Remaining Contractual Term, Outstanding Ending Balance 3 years 5 months 1 day 3 years 10 months 28 days 4 years 6 months 4 days
Average Remaining Contractual Term, Exercisable as of September 30, 2012 3 years 4 months 17 days    
Average Remaining Contractual Term, Unvested as of September 30, 2012 5 years 9 months 26 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 697,780 $ 353,955  
Aggregate Intrinsic Value, Outstanding Ending Balance 3,394,561 697,780 353,955
Aggregate Intrinsic Value, Exercisable as of September 30, 2012 3,362,208    
Aggregate Intrinsic Value, Unvested as of September 30, 2012 $ 32,353