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Financial Instruments (Schedule of Change in Interest Rate Profit (Loss)) (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Increase of 1% [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gain (loss) from increase decrease in interest rate | € 804 | € 864
Increase of 3% [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gain (loss) from increase decrease in interest rate | 2,473 | 2,587
Decrease of 1% [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gain (loss) from increase decrease in interest rate | (863) | (857)
Decrease of 3% [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gain (loss) from increase decrease in interest rate | € (2,532) | € (2,581)

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