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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - SARs - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 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 June 30, 2017 21,625      
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Number 3,375      
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 June 30, 2017 $ 77.90      
Average Remaining Contractual Term, Outstanding Beginning Balance 4 years 5 months 26 days   3 years 10 months 6 days 3 years 11 months 4 days
Average Remaining Contractual Term, Outstanding Ending Balance 4 years 5 months 26 days   3 years 10 months 6 days 3 years 11 months 4 days
Average Remaining Contractual Term, Exercisable as of June 30, 2017 4 years 1 month 9 days      
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 836,640 $ 945,055 $ 945,055  
Aggregate Intrinsic Value, Outstanding Ending Balance 2,500,970   $ 836,640 $ 945,055
Aggregate Intrinsic Value, Exercisable as of June 30, 2017 $ 2,498,506      
Share Based Compensation Arrangement By Share Based Payment Award, Unvested, Weighted Average Exercise Price $ 192.71      
Share Based Compensation Arrangement By Share Based Payment Award, Unvested, Weighted Average Remaining Contractual Term 6 years 10 months 17 days      
Share Based Compensation Arrangement By Share Based Payment Award, Unvested, Intrinsic Value $ 2,464