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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - SARs - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number Of Shares, Outstanding Beginning Balance 24,500 22,000 22,000  
Number Of Shares, SARs granted 4,500 4,500 4,500  
Number Of Shares, SARS exercised (4,000)   (2,000)  
Number Of Shares, Outstanding Ending Balance 25,000   24,500 22,000
Number Of Shares, Exercisable as of September 30, 2017 22,750      
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Number 2,250      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Weighted Average Exercise Price, Outstanding Beginning Balance $ 65.85 $ 57.04 $ 57.04  
Weighted Average Exercise Price, SARs granted 192.71   93.87  
Weighted Average Exercise Price, SARS exercised 36.38   32.00  
Weighted Average Exercise Price, Outstanding Ending Balance 93.40   $ 65.85 $ 57.04
Weighted Average Exercise Price, Exercisable as of September 30, 2017 $ 83.58      
Average Remaining Contractual Term, Outstanding Beginning Balance 4 years 2 months 23 days   3 years 10 months 6 days 3 years 11 months 4 days
Average Remaining Contractual Term, Outstanding Ending Balance 4 years 2 months 23 days   3 years 10 months 6 days 3 years 11 months 4 days
Average Remaining Contractual Term, Exercisable as of September 30, 2017 4 years      
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 836,640 $ 945,055 $ 945,055  
Aggregate Intrinsic Value, Outstanding Ending Balance 2,203,100   $ 836,640 $ 945,055
Aggregate Intrinsic Value, Exercisable as of September 30, 2017 $ 2,203,100      
Share Based Compensation Arrangement By Share Based Payment Award, Unvested, Weighted Average Exercise Price $ 192.71      
Average Remaining Contractual Term, Exercisable as of September 30, 2017 6 years 7 months 17 days      
Aggregate Intrinsic Value, Exercisable as of September 30, 2017 $ 0