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Taxation - Deferred Tax Assets and Liabilities, Others (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets and liabilities      
Net deferred tax assets € 123,024 € 112,539 € 66,157
Unrecognized deferred tax assets 66,364 55,282  
2020      
Deferred tax assets and liabilities      
Net deferred tax assets € 26,840 € 27,097  
Spain      
Deferred tax assets and liabilities      
Tax deduction maturity term 18 years    
Tax credit carryforward, exclusively for Spanish companies registered in the Basque Country (in years) 15 years    
United States      
Deferred tax assets and liabilities      
Tax credit carryforward (in years) 20 years