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Financial Instruments (Schedule of Composition of Derivatives) (Details)
€ in Thousands, $ in Thousands
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
USD ($)
 [1]
Dec. 31, 2020
EUR (€)
Disclosure of detailed information about financial instruments [line items]      
Derivatives presented under current assets € 42   € 78
Derivatives presented under non-current assets 2,276 $ 2,705 10,238
Derivatives presented under current liabilities (2,531)   (1,378)
Derivatives presented under non-current liabilities (6,297) $ (7,485) (8,336)
Financial power swap [Member]      
Disclosure of detailed information about financial instruments [line items]      
Derivatives presented under non-current assets 1,592   10,238
Derivatives presented under current liabilities (1,195)   0
Currency swap [Member]      
Disclosure of detailed information about financial instruments [line items]      
Derivatives presented under current assets 42   12
Derivatives presented under non-current assets 684   0
Derivatives presented under non-current liabilities 0   (144)
Forward contracts [Member]      
Disclosure of detailed information about financial instruments [line items]      
Derivatives presented under current assets 0   66
Swap contracts [Member]      
Disclosure of detailed information about financial instruments [line items]      
Derivatives presented under current liabilities (1,336)   (1,378)
Derivatives presented under non-current liabilities € (6,297)   € (8,192)
[1] Convenience translation into US$ (exchange rate as at June 30, 2021: EUR 1 = US$ 1.189)