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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - SARs - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number Of Shares, Outstanding Beginning Balance 28,000 25,000 25,000  
Number Of Shares, SARs granted 4,000 4,000 4,000  
Number Of Shares, SARS exercised (2,000)   (1,000)  
Number Of Shares, Outstanding Ending Balance 30,000   28,000 25,000
Number Of Shares, Exercisable as of September 30, 2019 28,000      
Number Of Shares, Unvested as of September 30, 2019 2,000      
Share-based Compensation Arrangement by Share-based Payment Award, SARs, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Weighted Average Exercise Price, Outstanding Beginning Balance $ 110.27 $ 93.40 $ 93.40  
Weighted Average Exercise Price, SARs granted 162.81   188.71  
Weighted Average Exercise Price, SARS exercised 50.50   41.50  
Weighted Average Exercise Price, Outstanding Ending Balance 124.13   $ 110.27 $ 93.40
Weighted Average Exercise Price, Exercisable as of September 30, 2019 120.99      
Share Based Compensation Arrangement By Share Based Payment Award, Unvested, Weighted Average Exercise Price $ 162.81      
Average Remaining Contractual Term, Outstanding Beginning Balance 3 years 9 months 10 days   3 years 7 months 20 days 3 years 11 months 23 days
Average Remaining Contractual Term, Outstanding Ending Balance 3 years 9 months 10 days   3 years 7 months 20 days 3 years 11 months 23 days
Average Remaining Contractual Term, Exercisable as of September 30, 2019 3 years 6 months 18 days      
Average Remaining Contractual Term, Unvested as of September 30, 2019 6 years 7 months 17 days      
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 2,019 $ 2,624 $ 2,624  
Aggregate Intrinsic Value, Outstanding Ending Balance 1,367   $ 2,019 $ 2,624
Aggregate Intrinsic Value, Exercisable as of September 30, 2019 1,367      
Aggregate Intrinsic Value, Unvested as of September 30, 2019 $ 0