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Earnings Per Common Share and Share Awards Summary Of Share-Based Award Transactions (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number Of Shares, Options exercised (1,500) (1,000) (2,650)  
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 $ 28.63  
StockOptionsAndStockAppreciationRightsSARS        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number Of Shares, Outstanding Beginning Balance 21,000 19,000 98,150  
Number Of Shares, Outstanding Ending Balance 22,000 21,000 19,000 98,150
Number Of Shares, Exercisable as of December 31, 2015 20,875      
Number Of Shares, Unvested as of December 31, 2015 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 $ 51.30 $ 45.74 $ 30.74  
Weighted Average Exercise Price, Outstanding Ending Balance 57.04 $ 51.30 $ 45.74 $ 30.74
Weighted Average Exercise Price, Exercisable as of December 31, 2015 56.18      
Weighted Average Exercise Price, Unvested as of December 31, 2015 $ 73.00      
Average Remaining Contractual Term, Outstanding Beginning Balance 3 years 11 months 4 days 3 years 7 months 20 days 3 years 5 months 4 days 3 years 2 months 1 day
Average Remaining Contractual Term, Exercisable as of December 31, 2015 3 years 9 months 18 days      
Average Remaining Contractual Term, Unvested as of December 31, 2015 6 years 4 months 20 days      
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 453,510 $ 669,610 $ 2,871,710  
Aggregate Intrinsic Value, Outstanding Ending Balance 945,055 $ 453,510 $ 669,610 $ 2,871,710
Aggregate Intrinsic Value, Exercisable as of December 31, 2015 914,680      
Aggregate Intrinsic Value, Unvested as of December 31, 2015 $ 30,375      
SARs        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number Of Shares, SARs granted 4,500 4,500 3,000  
Number Of Shares, Options exercised (2,000) (1,500) (79,500)  
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 $ 71.59  
Weighted Average Exercise Price, Options exercised $ 47.88 $ 49.04 $ 28.77