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Finance costs (Details) - PEN (S/) S/ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finance Costs |  |  |
Interest on senior notes, net of capitalization, note 14 | S/ 45,358 | S/ 44,729 | S/ 8,108
Finance cost on cross currency swaps | 26,140 | 27,800 | 25,169
Amortization of costs of issuance of senior notes | 1,644 | 1,644 | 1,644
Other | 95 | 94 | 1,098
Total interest expense | 73,237 | 74,267 | 36,019
Unwinding of discount of long-term incentive plan, note 13 | 522 | 345 | 788
Unwinding of discount of other receivables |  | 785 |
Total finance costs | S/ 73,759 | S/ 75,397 | S/ 36,807

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