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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - SARs - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, SARS, Outstanding [Roll Forward]            
Number of shares, outstanding beginning balance   39 35 39 35  
Number of shares, SARs granted 5 5 5 5 10  
Number Of Shares, SARS exercised       (2) (6)  
Number of shares, outstanding ending balance       42 39 35
Number of shares, exercisable as of September 30, 2023       32    
Number of shares, unvested as of September 30, 2023       10    
Share-based Compensation Arrangement by Share-based Payment Award, SARs, Outstanding, Weighted Average Exercise Price [Roll Forward]            
Weighted average exercise price, outstanding beginning balance   $ 159.39 $ 150.36 $ 159.39 $ 150.36  
Weighted average exercise price, SARs granted       142.88 155.16  
Weighted average exercise price, SARS exercised       93.87 94.44  
Weighted average exercise price, outstanding ending balance       160.83 $ 159.39 $ 150.36
Weighted average exercise price, exercisable as of September 30, 2023       166.57    
Weighted average exercise price, unvested as of September 30, 2023       $ 142.51    
Average remaining contractual term, outstanding beginning balance       3 years 11 months 8 days 4 years 1 month 6 days 3 years 11 months 15 days
Average remaining contractual term, outstanding ending balance       3 years 11 months 8 days 4 years 1 month 6 days 3 years 11 months 15 days
Average remaining contractual term, exercisable as of September 30, 2023       3 years 6 months 7 days    
Average remaining contractual term, unvested as of September 30, 2023       5 years 3 months 10 days    
Aggregate intrinsic value, outstanding beginning balance   $ 243 $ 1,643 $ 243 $ 1,643  
Aggregate intrinsic value, outstanding ending balance       166 $ 243 $ 1,643
Aggregate intrinsic value, exercisable as of September 30, 2023       110    
Aggregate intrinsic value, unvested as of September 30, 2023       $ 56