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Cost of sales (Details) - PEN (S/) S/ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cost Of Sales [Roll Forward] |  |  |
Beginning balance of goods and finished products, note 8(a) | S/ 21,427 | S/ 22,929 | S/ 18,951
Beginning balance of work in progress, note 8(a) | 107,882 | 88,349 | 69,711
Consumption of miscellaneous supplies | 232,840 | 246,033 | 286,420
Maintenance and third-party services | 167,735 | 172,781 | 113,042
Depreciation and amortization | 109,262 | 94,726 | 58,856
Shipping costs | 103,928 | 95,031 | 106,464
Personnel expenses, note 21(b) | 76,523 | 90,139 | 67,681
Costs of packaging | 32,011 | 35,924 | 34,273
Other manufacturing expenses | 14,616 | 19,927 | 51,637
Ending balance of goods and finished products, note 8(a) | (27,386) | (21,427) | (22,929)
Ending balance of work in progress, note 8(a) | (105,882) | (107,882) | (88,349)
Total cost of sales | S/ 732,956 | S/ 736,530 | S/ 695,757

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_103&doctype=Standard -URIDate 2017-03-09 + Details
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