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Fair values (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of fair value measurement of assets [abstract] |
Fair value measurement |
| December 31, 2017 | Level 1 | Level 2 | Level 3
Liabilities for which fair values are disclosed Long term borrowings | 41,219 | - | 41,219 | -
| December 31, 2016 | Level 1 | Level 2 | Level 3
Liabilities for which fair values are disclosed Long term borrowings | 62,831 | - | 62,831 | -

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