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Shareholders' Equity (Fair Value Assumptions) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 03, 2021
Jun. 08, 2020
Jun. 08, 2016
Jan. 31, 2019
Apr. 30, 2018
Jan. 30, 2017
Dec. 31, 2020
Dec. 31, 2017
Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected dividend yield             0.00% 2.68%
$28.38 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Average risk-free interest rate [1]     1.58%          
Expected dividend yield     2.42%          
Average expected volatility [2]     47.90%          
Termination rate     9.00%          
Suboptimal factor [3]     3.32          
$39.62 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Average risk-free interest rate [1]           2.35%    
Expected dividend yield           2.42%    
Average expected volatility [2]           43.71%    
Termination rate           9.00%    
Suboptimal factor [3]           3.28    
36.11 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Average risk-free interest rate [1]         2.92%      
Expected dividend yield         0.00%      
Average expected volatility [2]         45.13%      
Termination rate         9.00%      
Suboptimal factor [3]         3.2      
33.83 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Average risk-free interest rate [1]       2.55%        
Expected dividend yield       0.00%        
Average expected volatility [2]       44.62%        
Termination rate       9.00%        
Suboptimal factor [3]       3.18        
$32.54 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Average risk-free interest rate [1]   0.75%            
Expected dividend yield   0.00%            
Average expected volatility [2]   45.29%            
Termination rate   9.00%            
Suboptimal factor [3]   3.16            
41.84 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Average risk-free interest rate [1] 1.41%              
Expected dividend yield 0.00%              
Average expected volatility [2] 45.28%              
Termination rate 9.00%              
Suboptimal factor [3] 3.14              
[1] Risk-free interest rate represents risk free US$ zero-coupon US Government Bonds at time of grant.
[2] Expected average volatility represents a weighted average standard deviation rate for the price of the Company’s ordinary shares on the NASDAQ National Market.
[3] Suboptimal factor represents the multiple of the increase in the market share price on the day of grant of the option which, should it come to pass, will lead to exercise of the option by the employee. It is the average suboptimal factor of the Company and similar companies.