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Taxes on Income (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Line Items]          
Tax rate   24.00% 25.00% 26.50% 26.50%
Corporate tax on cash dividends distributed from exempted profits   25.00%      
Withholding tax deduction from cash dividends distributed from benefited profits   20.00% 20.00% 20.00%  
Non-Israeli subsidiaries' undistributed earnings for which Company has not provided for Israeli income and foreign withholding taxes   $ 4,043      
Assumed deferred tax liability attributable to taxable temporary differences from non-Israeli subsidiaries'' undistributed earnings   445      
Net operating loss carry-forwards   $ 500      
Subsequent Event [Member]          
Income Tax Disclosure [Line Items]          
Tax rate 21.00%        
Preferred Enterprise [Member] | Rest Of Country [Member]          
Income Tax Disclosure [Line Items]          
Corporate statutory tax rate on 2016 and thereafter   16.00%      
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   9.00%      
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%      
Beneficial Enterprise [Member]          
Income Tax Disclosure [Line Items]          
Tax exemption   $ 50,356 $ 45,405    
Assumed income tax liability   $ 12,589 $ 11,351