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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
6 Months Ended 9 Months Ended 24 Months Ended
Mar. 15, 2021
shares
Dec. 30, 2020
USD ($)
employee
Jun. 30, 2021
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2022
item
SOSARs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, Weighted-Average Exercise Price | $ / shares       $ 1,493.03  
Shares granted       77,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period       16,000  
Stock option exercises (shares)       430,000  
Weighted-average grant date fair value | $ / shares       $ 397.44  
SOSARs [Member] | Vesting Period 1 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       2 years  
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]          
Units vested       49,000  
Shares granted       24,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period       8,000  
Weighted-average grant date fair value | $ / shares       $ 1,479.78  
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]          
Units vested       0  
Units forfeited       1,000  
Performance shares granted       18,000  
Weighted-average grant date fair value | $ / shares       $ 1,479.55  
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]          
Units vested 29,000        
Number of employees affected by modified service requirements | employee   7      
Modified service requirements expense | $   $ 71,441      
Stock-based compensation expense | $       $ 55,463  
Modified service requirements expense, unamortized | $       $ 15,512  
Performance Shares [Member] | First Of Four Installments [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Units vested     17,000    
Performance Shares [Member] | Defined Minimum Targets Not Met [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Units vested       0  
Forecast [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of installments | item         4
Minimum [Member] | Performance Shares [Member] | Vesting Period 1 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting 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]          
Vesting percentage       300.00%