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Notes on the Consolidated Balance Sheet - Maturity structure of contract liabilities (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Consolidated Balance Sheet [Abstract]      
Non-current contract liabilities € 4 € 5 [1]  
Current contract liabilities 36,840 20,108 [1] € 19,241
Total contract liabilities € 36,844 € 20,113  
[1] (1) Comparative figures for the year ended December 31, 2018 were restated for errors. For further information, see Note 8.4.