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Financial Instruments (Schedule of Change in Interest Rate Profit (Loss)) (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Increase of 1% [Member]    
Disclosure of detailed information about financial instruments [line items]    
Gain (loss) from increase decrease in interest rate € 1,012 € 804
Increase of 3% [Member]    
Disclosure of detailed information about financial instruments [line items]    
Gain (loss) from increase decrease in interest rate 2,604 2,473
Decrease of 1% [Member]    
Disclosure of detailed information about financial instruments [line items]    
Gain (loss) from increase decrease in interest rate (581) (863)
Decrease of 3% [Member]    
Disclosure of detailed information about financial instruments [line items]    
Gain (loss) from increase decrease in interest rate € (2,172) € (2,532)