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Other operating expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of other operating expenses [Abstract] |  |  |  |  |
Royalties, net of asset tax (ITAN) and penalties (a) | $ 243,798 | [1] | $ 0 | [1] | $ 0
Other expenses | 15,028 |  | 24,107 |  | 26,739
Miscellaneous other operating expense | $ 258,826 |  | $ 24,107 |  | $ 26,739
[1] | Represents disputed royalties for the period December 2006 through September 2011 of US$174.8 million, net asset tax (ITAN) for the years 2009 to 2013 of US$33.6 million, profit sharing adjustments related to mining royalties of US$29.2 and penalties on disputed royalties for the period December 2006 through the year 2008 of US$6.2 million. Disputed royalties and special mining taxes for the period October 2011 through the year 2013 are recognized in “income tax expense” in the statements of comprehensive income (see Note 14(b)).

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