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Income and Mining Taxes (Details Textual) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Income Tax Contingency [Line Items] |  |
Unrecognized tax benefits that would impact effective income tax rate | $ 18.9 | $ 17.9
Penalties and interest accrued | 11.3 | $ 9.2
Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
Decrease in unrecognized tax benefits is reasonably possible | 1.0 |
Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
Decrease in unrecognized tax benefits is reasonably possible | $ 1.5 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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