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Property, Plant and Equipment - Activity (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment      
Capitalized interests € 14,894 € 8,955 € 8,839
Losses on disposals of property, plant and equipment € 1,408 € 1,401