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Inventories - Components (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Inventory [Line Items] |  |  |
Inventories | € 6,703 | € 9,996 |
Cost of inventories recognised as expense during period | 46,783 | 84,506 | € 84,849
Cost |  |  |
Disclosure Of Inventory [Line Items] |  |  |
Inventories | 7,945 | 11,176 |
Accumulated impairment |  |  |
Disclosure Of Inventory [Line Items] |  |  |
Inventories | € (1,242) | € (1,180) | € (1,162)

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