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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]              
Number Of Shares, SARs granted 4 7 4        
SARs              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]              
Number Of Shares, Outstanding Beginning Balance   30   28 30 28  
Number Of Shares, SARs granted       0 11 4  
Number Of Shares, SARS exercised         (8) (2)  
Number Of Shares, Outstanding Ending Balance 33       33 30 28
Number Of Shares, Exercisable as of June 30, 2020 25       25    
Number Of Shares, Unvested as of June 30, 2020 8       8    
Share-based Compensation Arrangement by Share-based Payment Award, SARs, Outstanding, Weighted Average Exercise Price [Roll Forward]              
Weighted Average Exercise Price, Outstanding Beginning Balance   $ 124.13   $ 110.27 $ 124.13 $ 110.27  
Weighted Average Exercise Price, SARs granted         135.05 162.81  
Weighted Average Exercise Price, SARS exercised         75.75 50.50  
Weighted Average Exercise Price, Outstanding Ending Balance $ 138.55       138.55 $ 124.13 $ 110.27
Weighted Average Exercise Price, Exercisable as of June 30, 2020 140.79       140.79    
Share Based Compensation Arrangement By Share Based Payment Award, Unvested, Weighted Average Exercise Price $ 131.81       $ 131.81    
Average Remaining Contractual Term, Outstanding Beginning Balance         4 years 7 months 28 days 3 years 6 months 10 days 3 years 7 months 20 days
Average Remaining Contractual Term, Outstanding Ending Balance         4 years 7 months 28 days 3 years 6 months 10 days 3 years 7 months 20 days
Average Remaining Contractual Term, Exercisable as of June 30, 2020         3 years 11 months 15 days    
Average Remaining Contractual Term, Unvested as of June 30, 2020         6 years 9 months 10 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance   $ 1,352   $ 2,019 $ 1,352 $ 2,019  
Aggregate Intrinsic Value, Outstanding Ending Balance $ 385       385 $ 1,352 $ 2,019
Aggregate Intrinsic Value, Exercisable as of June 30, 2020 385       385    
Aggregate Intrinsic Value, Unvested as of June 30, 2020 $ 0       $ 0