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Taxes on Income (Narrative) (Details) € in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 04, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Dec. 22, 2016 | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Corporate tax rates |  |  |  |  | 24.00% | 25.00% | 26.50% | 26.50%
Tax rate reduced | 1.5% to a rate of 25% |  |  | Reduced from 25% to 23% in two steps |  |  |  |
Tax loss carryforwards |  |  |  |  | € 37,620 |  |  |
Unrecognized tax benefits | $ |  |  |  |  |  |  | $ 2,900 |
Tax benefit |  |  |  |  |  |  |  | € 2,900
Reduced tax benefit |  |  |  |  | € 500 |  |  |
Changes in tax rates or tax laws enacted or announced [Member] |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Tax rate reduced |  | 23% | 24% |  |  |  |  |
Luxembourg taxation [Member] |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Corporate tax rates |  |  |  |  | 29.22% |  |  |
Italian taxation [Member] |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Corporate tax rates |  |  |  |  | 27.50% |  |  |
Tax rate reduced |  |  |  |  | Starting from 2017 the IRES rate is reduced to 24% |  |  |
Italian taxation [Member] | Resident and Non-Resident [Member] |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Tax rate reduced |  |  |  |  | only on income arising in Italy at the rate from 0% to 4.82% |  |  |
Spanish taxation [Member] |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Corporate tax rates |  |  |  |  | 30.00% |  |  |
Tax rate reduced |  |  |  |  | an aggregate turnover of less than EUR 10 million, pay a tax rate of 25% |  |  |
Spanish taxation [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Corporate tax rates |  |  |  |  | 25.00% |  |  |
Israel [Member] |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |
Corporate tax rates |  |  |  |  | 24.00% | 25.00% | 26.50% | 26.50%

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