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Taxes on Income (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Line Items]      
Tax rate 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 $ 2,871    
Assumed deferred tax liability attributable to taxable temporary differences from non-Israeli subsidiaries'' undistributed earnings 359    
Adjustment to deferred tax balance due to reduction in Development Zone A tax rate 94    
Net operating loss carry-forwards 1,500    
Beneficial Enterprise [Member]      
Income Tax Disclosure [Line Items]      
Tax exemption 45,405 $ 44,742  
Assumed income tax liability $ 11,351 $ 11,186  
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 9.00%    
Preferred Enterprise [Member] | Rest Of Country [Member]      
Income Tax Disclosure [Line Items]      
Corporate statutory tax rate on 2016 and thereafter 16.00%