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Derivative financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Euro Equivalent the Contractual Amounts of forward Exchange Contracts | The table below summarizes in euro equivalent the contractual amounts of forward exchange contracts used to hedge principally future cash flows from trade receivables and sale orders as at December 31, 2018, 2017 and January 1, 2017.
|  | 31/12/18 |  |  | 31/12/17 |  |  | 01/01/17 |
U.S. dollars |  |  | 14,528 |  |  |  | 21,979 |  |  |  | 26,670 |
Euro |  |  | 11,407 |  |  |  | 10,226 |  |  |  | 13,925 |
British pounds |  |  | 10,612 |  |  |  | 11,137 |  |  |  | 15,860 |
Japanese yen |  |  | 2,318 |  |  |  | 1,692 |  |  |  | 2,117 |
Australian dollars |  |  | 2,129 |  |  |  | 2,294 |  |  |  | 2,964 |
Canadian dollars |  |  | 1,300 |  |  |  | 1,338 |  |  |  | 4,965 |
Danish kroner |  |  | 1,086 |  |  |  | 713 |  |  |  | 618 |
Swedish kroner |  |  | 265 |  |  |  | 248 |  |  |  | 421 |
Total |  |  | 43,645 |  |  |  | 49,627 |  |  |  | 67,540 |
Summary of Information Regarding the Contract Amount in Estimated Fair Value of All of the Group's Forward Exchange Contacts | The following table presents information regarding the contract amount in euro equivalent amounts and the estimated fair value of all of the Group’s forward exchange contracts. Contracts with net unrealized gains are presented as ‘assets’ and contracts with net unrealized losses are presented as ‘liabilities’.
|  | 31/12/18 |  |  | 31/12/17 |  |  | 01/01/17 |
|  | Contract amount |  |  | Unrealised gains (losses) |  |  | Contract amount |  |  | Unrealised gains (losses) |  |  | Contract amount |  |  | Unrealised gains (losses) |
Assets |  |  | 27,459 |  |  |  | 218 |  |  |  | 31,089 |  |  |  | 339 |  |  |  | 25,698 |  |  |  | 223 |
Liabilities |  |  | 16,186 |  |  |  | (320 | ) |  |  | 18,538 |  |  |  | (267 | ) |  |  | 41,842 |  |  |  | (1,293 | )
Total |  |  | 43,645 |  |  |  | (102 | ) |  |  | 49,627 |  |  |  | 72 |  |  |  | 67,540 |  |  |  | (1,070 | )

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