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Basis of Preparation (Narrative) (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Deposit reclassified from short-term to long-term restricted cash and deposits € 3,338  
Amount of liabilities in connection with derivatives € 3,361  
Accounting correction amount   € 3,338
Bottom of range [Member]    
Statement Line Items [Line Items]    
Discount rates used for measuring the lease liability 2.56%  
Top of range [member]    
Statement Line Items [Line Items]    
Discount rates used for measuring the lease liability 4.57%  
Weighted Average [Member]    
Statement Line Items [Line Items]    
Discount rates used for measuring the lease liability 3.40%