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Financial Instruments - Credit Risk - Trade receivables net of the bad debt provision by ageing (Details) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Credit risk |  |  |  |
Total gross carrying amount | € 392,088 | € 289,698 |  |
Allowance account for credit losses of financial assets | (22,291) | (20,531) | € (19,706) | € (17,987)
Trade receivables | € 369,797 | € 269,167 |  |
Not matured |  |  |  |
Credit risk |  |  |  |
ECL Rate | 0.19% | 0.19% |  |
Total gross carrying amount | € 285,942 | € 180,448 |  |
Allowance account for credit losses of financial assets | (585) | (335) |  |
Trade receivables | € 285,357 | € 180,113 |  |
Less than 1 month |  |  |  |
Credit risk |  |  |  |
ECL Rate | 0.19% | 0.19% |  |
Total gross carrying amount | € 48,212 | € 52,310 |  |
Allowance account for credit losses of financial assets | (57) | (92) |  |
Trade receivables | € 48,155 | € 52,218 |  |
Past due 31-60 days |  |  |  |
Credit risk |  |  |  |
ECL Rate | 0.62% | 0.62% |  |
Total gross carrying amount | € 15,831 | € 11,125 |  |
Allowance account for credit losses of financial assets | (101) | (67) |  |
Trade receivables | € 15,730 | € 11,058 |  |
Past due 61-90 days |  |  |  |
Credit risk |  |  |  |
ECL Rate | 2.03% | 2.03% |  |
Total gross carrying amount | € 10,364 | € 10,729 |  |
Allowance account for credit losses of financial assets | (156) | (208) |  |
Trade receivables | € 10,208 | € 10,521 |  |
Past due 91-180 days |  |  |  |
Credit risk |  |  |  |
ECL Rate | 3.01% | 3.01% |  |
Total gross carrying amount | € 8,606 | € 12,158 |  |
Allowance account for credit losses of financial assets | (243) | (353) |  |
Trade receivables | € 8,363 | € 11,805 |  |
6 - 12 months |  |  |  |
Credit risk |  |  |  |
ECL Rate | 8.52% | 8.52% |  |
Total gross carrying amount | € 2,216 | € 4,158 |  |
Allowance account for credit losses of financial assets | (232) | (1,222) |  |
Trade receivables | € 1,984 | € 2,936 |  |
More than one year |  |  |  |
Credit risk |  |  |  |
ECL Rate | 100.00% | 100.00% |  |
Total gross carrying amount | € 3,056 | € 7,549 |  |
Allowance account for credit losses of financial assets | (3,056) | (7,033) |  |
Trade receivables |  | 516 |  |
Customers with Objective Evidence of Impairment [Member] |  |  |  |
Credit risk |  |  |  |
Total gross carrying amount | 17,861 | 11,221 |  |
Allowance account for credit losses of financial assets | € (17,861) | € (11,221) |  |

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- Definition The gross carrying amount of trade receivables from sale of goods and services. + References No definition available. + Details
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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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