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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Options exercised   (1,500)  
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  
StockOptionsAndStockAppreciationRightsSARS [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Outstanding Beginning Balance 22,000 21,000  
Number Of Shares, Outstanding Ending Balance 20,000 22,000 21,000
Number Of Shares, Exercisable as of March 31, 2016 20,000    
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  
Weighted Average Exercise Price, Outstanding Ending Balance 59.55 $ 57.04 $ 51.30
Weighted Average Exercise Price, Exercisable as of March 31, 2016 $ 59.55    
Average Remaining Contractual Term, Outstanding Beginning Balance 4 years 10 days 3 years 11 months 4 days 3 years 7 months 20 days
Average Remaining Contractual Term, Outstanding Ending Balance 4 years 10 days 3 years 11 months 4 days 3 years 7 months 20 days
Average Remaining Contractual Term, Exercisable as of March 31, 2016 4 years 10 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 945,055 $ 453,510  
Aggregate Intrinsic Value, Outstanding Ending Balance 630,455 $ 945,055 $ 453,510
Aggregate Intrinsic Value, Exercisable as of March 31, 2016 $ 630,455    
SARs      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, SARs granted 0 4,500  
Number Of Shares, Options exercised (2,000) (2,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, SARs granted $ 0.00 $ 73.00  
Weighted Average Exercise Price, Options exercised $ 32.00 $ 47.88