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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 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 (1,000) (2,650)  
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Number 2,250    
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Weighted Average Exercise Price $ 68.70    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Options exercised $ 27.21 $ 28.63  
StockOptionsAndStockAppreciationRightsSARS [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Outstanding Beginning Balance 19,000 98,150  
Number Of Shares, Options/SARs cancelled/forfeited/expired 0 0  
Number Of Shares, Outstanding Ending Balance 21,000 19,000 98,150
Number Of Shares, Exercisable as of September 30, 2014 18,750    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Outstanding Beginning Balance $ 45.74 $ 30.74  
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired $ 0.00 $ 0.00  
Weighted Average Exercise Price, Outstanding Ending Balance $ 51.30 $ 45.74 $ 30.74
Weighted Average Exercise Price, Exercisable as of September 30, 2014 $ 49.22    
Average Remaining Contractual Term, Outstanding Beginning Balance 3 years 10 months 24 days 3 years 5 months 4 days 3 years 2 months 1 day
Average Remaining Contractual Term, Outstanding Ending Balance 3 years 10 months 24 days 3 years 5 months 4 days 3 years 2 months 1 day
Average Remaining Contractual Term, Exercisable as of September 30, 2014 3 years 6 months 25 days    
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Weighted Average Remaining Contractual Term 6 years 7 months 20 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 669,610 $ 2,871,710  
Aggregate Intrinsic Value, Outstanding Ending Balance 459,810 669,610 2,871,710
Aggregate Intrinsic Value, Exercisable as of September 30, 2014 449,685    
Share Based Compensation Arrangement By Share Based Payment Award, Options, Unvested, Intrinsic Value $ 10,125    
SARs
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, SARs granted 4,500 3,000  
Number Of Shares, Options exercised (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 $ 68.70 $ 71.59  
Weighted Average Exercise Price, Options exercised $ 49.04 $ 28.77