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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Value of options, Unvested   $ 223,885 $ 851,552
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options, Granted 295,549    
Number of options, Vesting 175,591    
Number of options, Forfeited 1,449    
Number of options, Unvested 118,509    
Value of options, Granted $ 4,460,709    
Value of options, Vesting 2,566,938    
Value of options, Unvested 1,872,520    
Value of options, Forfeited $ 21,250    
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 59,646    
Number of options, Forfeited 517    
Number of options, Unvested 7,990    
Value of options, Granted $ 810,779    
Value of options, Vesting 708,904    
Value of options, Unvested 95,629    
Value of options, Forfeited $ 6,245    
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 52,465    
Number of options, Unvested 18,073    
Value of options, Granted $ 1,124,348    
Value of options, Vesting 836,258    
Value of options, Unvested $ 288,090    
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 63,480    
Number of options, Forfeited 932    
Number of options, Unvested 33,188    
Value of options, Granted $ 1,581,512    
Value of options, Vesting 1,021,776    
Value of options, Unvested 544,731    
Value of options, Forfeited $ 15,005    
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, Unvested 59,258    
Value of options, Granted $ 944,070    
Value of options, Unvested $ 944,070