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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 15, 2021
shares
Dec. 30, 2020
USD ($)
employee
$ / shares
Sep. 30, 2022
USD ($)
employee
Sep. 30, 2022
USD ($)
item
$ / shares
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
item
shares
Stock Options And SOSARs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted       94,000    
Shares forfeited       20,000    
Grant date fair value | $ / shares       $ 455.08    
Granted, weighted-average exercise price | $ / shares       $ 1,560.51    
Shares exercised       77,000    
Weighted-average Black-Scholes fair value per share at date of grant | $ / shares       $ 455.08    
Stock Options And SOSARs [Member] | Vesting Period 1 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       2 years    
Stock Options And SOSARs [Member] | Vesting Period 2 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted       29,000    
Shares forfeited       8,000    
Grant date fair value | $ / shares       $ 1,563.14    
Units vested       23,000    
Weighted-average Black-Scholes fair value per share at date of grant | $ / shares       $ 1,563.14    
Restricted Stock Units [Member] | Vesting Period 1 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       2 years    
Restricted Stock Units [Member] | Vesting Period 2 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grant date fair value | $ / shares       $ 1,569.39    
Units vested       55,000    
Units forfeited       6,000    
Performance shares granted       24,000    
Weighted-average Black-Scholes fair value per share at date of grant | $ / shares       $ 1,569.39    
Performance and market measurement period       3 years    
Performance Shares [Member] | 2018 Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of installments | item       4    
Units vested 29,000          
Units forfeited       400    
Number of installments remaining | item       1    
Remaining service period       3 months    
Share-based compensation adjustment | $       $ 536    
Number of employees affected by modified service requirements | employee   7        
Modified service requirements expense | $   $ 71,441        
Stock-based compensation expense | $       6,145 $ 55,463  
Modified service requirements expense, unamortized | $       $ 1,116    
Stock price | $ / shares   $ 1,374.17        
Performance Shares [Member] | First Half Vested [Member] | 2018 Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of installments | item           2
Units vested           33,000
Performance Shares [Member] | Second Half Vested [Member] | 2018 Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units vested       8,000    
Performance Shares [Member] | Defined Minimum Targets Not Met [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units vested       0    
Certain Equity Awards of an Employee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of employees affected by modified service requirements | employee     1      
Modified service requirements expense | $     $ 6,701      
Certain Equity Awards of an Employee [Member] | Separation Vesting Period [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     8 months      
Minimum [Member] | Performance Shares [Member] | Vesting Period 1 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Targeted number of shares, quantity that will vest, percentage       0.00%    
Maximum [Member] | Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of target number of shares to be earned if certain criteria is met       100.00%    
Maximum [Member] | Performance Shares [Member] | Vesting Period 1 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Targeted number of shares, quantity that will vest, percentage       300.00%