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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 |  |

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