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Expenses by nature (Tables) | 12 Months Ended
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Dec. 31, 2019
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Summary of Expenses by Nature | The following table shows the expenses by nature for the years ended December 31, 2019, 2018 and 2017 as required by IAS 1.104.
|  | 2019 |  |  | 2018 |  |  | 2017 |
Changes in inventories |  |  | 14,542 |  |  |  | 6,850 |  |  |  | (63 | )
Raw materials and consumables |  |  | 139,205 |  |  |  | 177,591 |  |  |  | 180,872 |
Services |  |  | 91,526 |  |  |  | 107,074 |  |  |  | 118,681 |
Employee benefits expense |  |  | 129,051 |  |  |  | 134,622 |  |  |  | 137,904 |
Depreciation and amortization, net of government grants |  |  | 23,487 |  |  |  | 10,003 |  |  |  | 11,362 |
Other |  |  | 13,396 |  |  |  | 22,451 |  |  |  | 24,004 |
Total cost of sales, selling and administrative expenses |  |  | 411,207 |  |  |  | 458,591 |  |  |  | 472,760 |
Summary of Depreciation and Amortization | The following tables show in which caption is included the depreciation and amortization, net of government grants.
Included in cost of sales |  | 2019 |  |  | 2018 |  |  | 2017 |
Depreciation of property, plant and equipment |  |  | 7,867 |  |  |  | 7,455 |  |  |  | 8,565 |
Depreciation of right-of-use assets |  |  | 3,842 |  |  |  | — |  |  |  | — |
Amortisation of intangible assets |  |  | 14 |  |  |  | 34 |  |  |  | 73 |
Government grants |  |  | (1,463 | ) |  |  | (1,061 | ) |  |  | (1,068 | )
Total (a) |  |  | 10,260 |  |  |  | 6,428 |  |  |  | 7,570 |
Included in selling expenses |  |  |  |  |  |  |  |  |  |  |  |
Depreciation of property, plant and equipment |  |  | 2,721 |  |  |  | 2,274 |  |  |  | 1,818 |
Depreciation of right-of-use assets |  |  | 9,084 |  |  |  | — |  |  |  | — |
Amortisation of intangible assets |  |  | — |  |  |  | — |  |  |  | 306 |
Total (b) |  |  | 11,805 |  |  |  | 2,274 |  |  |  | 2,124 |
Included in administrative expenses |  |  |  |  |  |  |  |  |  |  |  |
Depreciation of property, plant and equipment |  |  | 381 |  |  |  | 425 |  |  |  | 478 |
Depreciation of right-of-use assets |  |  | 301 |  |  |  | — |  |  |  | — |
Amortisation of intangible assets |  |  | 903 |  |  |  | 876 |  |  |  | 1,190 |
Government grants |  |  | (163 | ) |  |  | — |  |  |  | — |
Total (c) |  |  | 1,422 |  |  |  | 1,301 |  |  |  | 1,668 |
Total depreciation and amortization (a+b+c) |  |  | 23,487 |  |  |  | 10,003 |  |  |  | 11,362 |
Summary of Employee Benefit Expense | The following tables show in which caption is included the employee benefits expense.
Included in cost of sales |  | 2019 |  |  | 2018 |  |  | 2017 |
Salary and wages |  |  | 60,756 |  |  |  | 62,815 |  |  |  | 57,401 |
Social security costs |  |  | 17,251 |  |  |  | 18,310 |  |  |  | 18,854 |
Employees’ leaving entitlement |  |  | 3,704 |  |  |  | 3,827 |  |  |  | 3,710 |
Other costs |  |  | 4,498 |  |  |  | 4,875 |  |  |  | 12,365 |
Total (a) |  |  | 86,209 |  |  |  | 89,827 |  |  |  | 92,330 |
Included in selling expenses |  |  |  |  |  |  |  |  |  |  |  |
Salary and wages |  |  | 18,736 |  |  |  | 19,754 |  |  |  | 20,475 |
Social security costs |  |  | 3,800 |  |  |  | 4,019 |  |  |  | 4,376 |
Employees’ leaving entitlement |  |  | 557 |  |  |  | 350 |  |  |  | 660 |
Other costs |  |  | 689 |  |  |  | 649 |  |  |  | 699 |
Total (b) |  |  | 23,782 |  |  |  | 24,772 |  |  |  | 26,210 |
Included in administrative expenses |  |  |  |  |  |  |  |  |  |  |  |
Salary and wages |  |  | 13,725 |  |  |  | 14,585 |  |  |  | 13,843 |
Social security costs |  |  | 3,502 |  |  |  | 3,638 |  |  |  | 3,570 |
Employees’ leaving entitlement |  |  | 664 |  |  |  | 635 |  |  |  | 831 |
Other costs |  |  | 1,169 |  |  |  | 1,165 |  |  |  | 1,120 |
Total (c) |  |  | 19,060 |  |  |  | 20,023 |  |  |  | 19,364 |
Total employee benefits expense (a+b+c) |  |  | 129,051 |  |  |  | 134,622 |  |  |  | 137,904 |

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