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Taxes on Income (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Line Items]      
Tax rate 23.00% 23.00% 24.00%
Federal corporate income tax rate effective January 1, 2018 21.00%    
Corporate tax on cash dividends distributed from exempted profits 25.00%    
Withholding tax deduction from cash dividends distributed from benefited profits 20.00%    
Non-Israeli subsidiaries' undistributed earnings for which Company has not provided for Israeli income and foreign withholding taxes $ 7,221    
Assumed deferred tax liability attributable to taxable temporary differences from non-Israeli subsidiaries'' undistributed earnings 1,030    
Net operating loss carry-forwards $ 900    
Israel Tax Reform [Member]      
Income Tax Disclosure [Line Items]      
Corporate statutory tax rate on 2018 and thereafter 23.00%    
Corporate statutory tax rate on 2017 24.00%    
Corporate statutory tax rate on 2016 25.00%    
Preferred Enterprise [Member] | Development Area A [Member]      
Income Tax Disclosure [Line Items]      
Corporate statutory tax rate on 2017 and thereafter 7.50%    
Corporate statutory tax rate on 2016 7.50%    
Preferred Enterprise [Member] | Rest Of Country [Member]      
Income Tax Disclosure [Line Items]      
Corporate statutory tax rate on 2016 and thereafter 16.00%    
Beneficial Enterprise [Member]      
Income Tax Disclosure [Line Items]      
Tax exemption $ 50,516 $ 46,581  
Assumed income tax liability $ 12,629 $ 11,645