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Finance costs and finance revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finance revenues:      
Interests on loans to associates, note 29(a) $ 1,685 $ 4,164 $ 2,286
Interest on time deposits 1,050 358 419
Interests on third parties loans 813 489 492
Interests on tax claims 153 487 1,297
Income from financial instruments 0 743 0
Dividends income 0 589 500
Other finance revenues 43 0 0
Finance income before unrealized variation of fair value related to contingent consideration liability 3,744 6,830 4,994
Unrealized variation of the fair value related to contingent consideration liability (b) 1,773 0 6,032
Total finance revenues 5,517 6,830 11,026
Finance costs:      
Interest on borrowings 27,052 18,668 17,875
Interest on loans 1,056 4,643 5,565
Banking expenses 552 319 366
Increase in debt issuance costs, note 16(g) 480 0 0
Tax on financial transactions 180 159 312
Interest on commercial obligations 5 496 120
Other finance costs 7 [1] 830 [1] 41
Finance costs before unrealized variation of fair value related to contingent consideration liability 29,332 25,115 24,279
Accrual of debt issuance costs, note 16(g) 909 0 0
Accrual of the present value for mine and exploration project closure, note 15(b) 4,382 4,116 3,293
Unrealized variation of the fair value related to contingent consideration liability (b) 0 2,349 0
Finance costs $ 34,623 $ 31,580 $ 27,572
[1] Primarily represents interest and interest on penalties on income and non-income tax contingencies related to SUNAT assessments for prior years in which the Company expects to obtain an unfavorable result.