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Share-Based Compensation And Share Repurchase Plans (Schedule Of Restricted Stock Units Issued And Vested) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Value of options, Unvested $ 13,969 $ 223,885
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options, Granted 697,515  
Number of options, Vesting 225,967  
Number of options, Forfeited 7,337  
Number of options, Unvested 464,211  
Value of options, Granted $ 6,221,091  
Value of options, Vesting 3,341,245  
Value of options, Forfeited 107,144  
Value of options, Unvested $ 2,772,703  
Restricted Stock Units (RSUs) [Member] | 2016 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options, Granted 68,153  
Number of options, Vesting 67,372  
Number of options, Forfeited 781  
Value of options, Granted $ 815,160  
Value of options, Vesting 805,760  
Value of options, Forfeited $ 9,400  
Restricted Stock Units (RSUs) [Member] | 2017 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options, Granted 70,538  
Number of options, Vesting 61,590  
Number of options, Forfeited 532  
Number of options, Unvested 8,416  
Value of options, Granted $ 1,124,348  
Value of options, Vesting 981,448  
Value of options, Forfeited 8,496  
Value of options, Unvested $ 134,404  
Restricted Stock Units (RSUs) [Member] | 2018 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options, Granted 97,600  
Number of options, Vesting 74,292  
Number of options, Forfeited 2,102  
Number of options, Unvested 21,206  
Value of options, Granted $ 1,581,512  
Value of options, Vesting 1,199,232  
Value of options, Forfeited 34,240  
Value of options, Unvested $ 348,040  
Restricted Stock Units (RSUs) [Member] | 2019 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options, Granted 59,258  
Number of options, Vesting 22,713  
Number of options, Forfeited 3,104  
Number of options, Unvested 33,441  
Value of options, Granted $ 944,070  
Value of options, Vesting 354,806  
Value of options, Forfeited 50,005  
Value of options, Unvested $ 539,259  
Restricted Stock Units (RSUs) [Member] | 2020 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options, Granted 401,966  
Number of options, Forfeited 818  
Number of options, Unvested 401,148  
Value of options, Granted $ 1,756,002  
Value of options, Forfeited 5,002  
Value of options, Unvested $ 1,751,000