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FINANCIAL RISK MANAGEMENT - Exposure to Financial Counterparties by Rating Type (Details)
€ in Thousands
Dec. 31, 2020
EUR (€)
counterparty
Dec. 31, 2019
EUR (€)
counterparty
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Number of financial counterparties | counterparty 13 14
Exposure € 422,000 € 169,000
Credit exposure threshold amount € 250 € 250
Rated Aa or better    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Number of financial counterparties | counterparty 3 2
Exposure € 120,000 € 83,000
Rated A    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Number of financial counterparties | counterparty 8 9
Exposure € 282,000 € 81,000
Rated Baa    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Number of financial counterparties | counterparty 2 3
Exposure € 20,000 € 5,000