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Property, Plant and Equipment - Self Constructed PP&E and Commitments (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment      
Property, plant and equipment € 2,159,545 € 1,951,983 € 1,760,053
Self-constructed property, plant and equipment      
Property, Plant and Equipment      
Property, plant and equipment € 102,229 € 66,995