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Other operating expenses (Details Textual) - USD ($) | 12 Months Ended | 60 Months Ended | 72 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2013 | Dec. 31, 2011
Disclosure of other operating expenses [Abstract] |  |  |  |  |  |  |  |
Disputed royalties for december two thousand six through september two thousand eleven |  | $ 174,800,000 |  |  |  |  |  |
Net asset tax relating to royalties |  | 33,600,000 | $ 12,100,000 | $ 12,100,000 | $ 12,100,000 | $ 12,100,000 |  |
Profit sharing adjustments related to mining royalties | $ 3,600,000 | 29.2 |  |  |  |  |  |
Penalties on disputed royalties |  | $ 6,200,000 |  |  |  |  | $ 17,700,000 | $ 33,800,000

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- References No definition available. + Details
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- Definition The amount of disputed royalties for december 2006 through september 2011 recognized during the reporting period. + References No definition available. + Details
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- Definition The amount of net asset tax relating to royalties recognized during the reporting period. + References No definition available. + Details
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- Definition The amount of penalties on disputed royalties recognized during the reporting period. + References No definition available. + Details
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- Definition The amount of profit sharing adjustments related to mining royalties recognized during the reporting period. + References No definition available. + Details
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