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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Options exercised (1,500) (1,000)  
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Number 2,250    
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Weighted Average Exercise Price $ 73.00    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Options exercised $ 36.79 $ 27.21  
StockOptionsAndStockAppreciationRightsSARS [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Outstanding Beginning Balance 21,000 19,000  
Number Of Shares, Options/SARs cancelled/forfeited/expired 0 0  
Number Of Shares, Outstanding Ending Balance 22,000 21,000 19,000
Number Of Shares, Exercisable as of September 30, 2015 19,750    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Outstanding Beginning Balance $ 51.30 $ 45.74  
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired 0.00 0.00  
Weighted Average Exercise Price, Outstanding Ending Balance 57.04 $ 51.30 $ 45.74
Weighted Average Exercise Price, Exercisable as of September 30, 2015 $ 55.23    
Average Remaining Contractual Term, Outstanding Beginning Balance 4 years 2 months 4 days 3 years 7 months 20 days 3 years 5 months 4 days
Average Remaining Contractual Term, Outstanding Ending Balance 4 years 2 months 4 days 3 years 7 months 20 days 3 years 5 months 4 days
Average Remaining Contractual Term, Exercisable as of September 30, 2015 3 years 10 months 24 days    
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Weighted Average Remaining Contractual Term 6 years 7 months 20 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 453,510 $ 669,610  
Aggregate Intrinsic Value, Outstanding Ending Balance 355,455 $ 453,510 $ 669,610
Aggregate Intrinsic Value, Exercisable as of September 30, 2015 355,005    
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Intrinsic Value $ 450    
SARs      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, SARs granted 4,500 4,500  
Number Of Shares, Options exercised (2,000) (1,500)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, SARs granted $ 73.00 $ 68.70  
Weighted Average Exercise Price, Options exercised $ 47.88 $ 49.04