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CASH AND CASH EQUIVALENTS AND NOTES TO THE CONSOLIDATED STATEMENT OF CASH FLOWS - Narrative (Details) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of external credit grades [line items]    
Time deposit € 50,000 € 100,000
Money market funds € 5,568 € 7,068
Euro    
Disclosure of external credit grades [line items]    
Cash and cash equivalents, denomination percentage 80.00% 85.00%
Cash Collected From Settlements of Receivables or Collateral    
Disclosure of external credit grades [line items]    
Restricted cash and cash equivalents € 31,820 € 44,085
CHINA    
Disclosure of external credit grades [line items]    
Restricted cash and cash equivalents 81,337 € 96,726
AAAm    
Disclosure of external credit grades [line items]    
Money market funds € 50,069