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Earnings Per Common Share and Share Awards Summary Of Share-Based Award Transactions (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 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, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Weighted Average Exercise Price, Options exercised   $ 36.79 $ 27.21  
StockOptionsAndStockAppreciationRightsSARS        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number Of Shares, Outstanding Beginning Balance 22,000 21,000 19,000  
Number Of Shares, Outstanding Ending Balance 24,500 22,000 21,000 19,000
Number Of Shares, Exercisable as of December 31, 2016 23,375      
Number Of Shares, Unvested as of December 31, 2016 1,125      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Weighted Average Exercise Price, Outstanding Beginning Balance $ 57.04 $ 51.30 $ 45.74  
Weighted Average Exercise Price, Outstanding Ending Balance 65.85 $ 57.04 $ 51.30 $ 45.74
Weighted Average Exercise Price, Exercisable as of December 31, 2016 64.50      
Weighted Average Exercise Price, Unvested as of December 31, 2016 $ 93.87      
Average Remaining Contractual Term, Outstanding Beginning Balance 3 years 10 months 6 days 3 years 11 months 4 days 3 years 7 months 20 days 3 years 5 months 4 days
Average Remaining Contractual Term, Exercisable as of December 31, 2016 3 years 8 months 23 days      
Average Remaining Contractual Term, Unvested as of December 31, 2016 6 years 4 months 17 days      
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 945,055 $ 453,510 $ 669,610  
Aggregate Intrinsic Value, Outstanding Ending Balance 836,640 $ 945,055 $ 453,510 $ 669,610
Aggregate Intrinsic Value, Exercisable as of December 31, 2016 829,744      
Aggregate Intrinsic Value, Unvested as of December 31, 2016 $ 6,896      
SARs        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number Of Shares, SARs granted 4,500 4,500 4,500  
Number Of Shares, Options exercised (2,000) (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 $ 93.87 $ 73.00 $ 68.70  
Weighted Average Exercise Price, Options exercised $ 32.00 $ 47.88 $ 49.04