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Financial Instruments (Schedule of Fair Values Hierarchy) (Details) - EUR (€) € in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Income receivable in connection with the Erez electricity pumped storage project | € 1,293 | € 1,249
Marketable securities | 5,569 | 5,412
Forward contracts | (2,040) | (2,650)
Swap contracts | (560) | (539)
Currency swap | (1,969) | (1,244)
Loans granted to associates | 11,902 |
Level 1 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Income receivable in connection with the Erez electricity pumped storage project |  |
Marketable securities |  |
Forward contracts |  |
Swap contracts |  |
Currency swap |  |
Loans granted to associates |  |
Level 2 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Income receivable in connection with the Erez electricity pumped storage project |  |
Marketable securities | 5,569 | 5,412
Forward contracts | (2,040) | (2,650)
Swap contracts | (560) | (539)
Currency swap | (1,969) | (1,244)
Loans granted to associates |  |
Level 3 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Income receivable in connection with the Erez electricity pumped storage project | 1,293 | 1,249
Marketable securities |  |
Forward contracts |  |
Swap contracts |  |
Currency swap |  |
Loans granted to associates | € 11,902 |

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