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Other operating expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)).