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Financial risk management, objectives and policies (Details 4) - PEN (S/) S/ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes In Liabilities Arising From Financing Activities [RollForward] |  |  |
Amortization of costs of issuance of senior notes | S/ 1,644 | S/ 1,644 | S/ 1,644
Hedge Finance Cost Payable [Member] |  |  |
Changes In Liabilities Arising From Financing Activities [RollForward] |  |  |
Balance as of beginning | 11,073 | 10,897 |
Distribution of dividends |  |  |
Finance cost on cross currency swaps | 26,140 | 27,800 |
Cash flows | (26,708) | (27,624) |
Movement of foreign currency |  |  |
Amortization of costs of issuance of senior notes |  |  |
Others |  |  |
Balance as of end | 10,505 | 11,073 | 10,897
Dividends Payable [Member] |  |  |
Changes In Liabilities Arising From Financing Activities [RollForward] |  |  |
Balance as of beginning | 5,070 | 4,235 |
Distribution of dividends | 149,837 | 155,236 |
Finance cost on cross currency swaps |  |  |
Cash flows | (124,993) | (154,401) |
Movement of foreign currency |  |  |
Amortization of costs of issuance of senior notes |  |  |
Others | (189) |  |
Balance as of end | 29,725 | 5,070 | 4,235
Interest-bearing Loans [Member] |  |  |
Changes In Liabilities Arising From Financing Activities [RollForward] |  |  |
Balance as of beginning | 998,148 | 1,012,406 |
Distribution of dividends |  |  |
Finance cost on cross currency swaps |  |  |
Cash flows |  |  |
Movement of foreign currency | (34,502) | (15,902) |
Amortization of costs of issuance of senior notes | 1,644 | 1,644 |
Others |  |  |
Balance as of end | S/ 965,290 | S/ 998,148 | S/ 1,012,406

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