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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Options exercised (2,650) (6,380)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Options exercised $ 28.63 $ 25.17  
StockOptionsAndStockAppreciationRightsSARS [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Outstanding Beginning Balance 98,150 101,600  
Number Of Shares, Options/SARs cancelled/forfeited/expired 0 (70)  
Number Of Shares, Outstanding Ending Balance 19,000 98,150 101,600
Number Of Shares, Exercisable as of September 30, 2013 17,500    
Number Of Shares, Unvested as of September 30. 2013 1,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Outstanding Beginning Balance $ 30.74 $ 29.81  
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired $ 0.00 $ 31.00  
Weighted Average Exercise Price, Outstanding Ending Balance $ 45.74 $ 30.74 $ 29.81
Weighted Average Exercise Price, Exercisable as of September 30, 2013 $ 43.52    
Weighted Average Exercise Price, Unvested as of September 30, 2013 $ 71.59    
Average Remaining Contractual Term, Outstanding Beginning Balance 3 years 8 months 4 days 3 years 2 months 1 day 3 years 10 months 28 days
Average Remaining Contractual Term, Outstanding Ending Balance 3 years 8 months 4 days 3 years 2 months 1 day 3 years 10 months 28 days
Average Remaining Contractual Term, Exercisable as of September 30, 2013 3 years 5 months 4 days    
Average Remaining Contractual Term, Unvested as of September 30, 2013 6 years 7 months 17 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 2,871,710 $ 697,780  
Aggregate Intrinsic Value, Outstanding Ending Balance 557,890 2,871,710 697,780
Aggregate Intrinsic Value, Exercisable as of September 30, 2013 552,625    
Aggregate Intrinsic Value, Unvested as of September 30, 2013 $ 5,265    
SARs
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, SARs granted 3,000 3,000  
Number Of Shares, Options exercised (79,500) 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, SARs granted $ 71.59 $ 50.50  
Weighted Average Exercise Price, Options exercised $ 28.77 $ 0.00