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Taxes on Income (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Line Items] |  |  |
Tax rate | 23.00% | 24.00% | 25.00%
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 | $ 6,701 |  |
Assumed deferred tax liability attributable to taxable temporary differences from non-Israeli subsidiaries'' undistributed earnings | 838 |  |
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 | 9.00% |  |
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 | $ 46,581 | $ 50,356 |
Assumed income tax liability | $ 11,645 | $ 12,589 |

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