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Fixed Assets and Mineral Leaseholds (Narrative) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Asset Retirement Obligations Details [Line Items] |  |
Asset Retirement Obligation | $ 203,641 | $ 213,726
Accrued Liabilities |  |
Asset Retirement Obligations Details [Line Items] |  |
Asset Retirement Obligation | $ 19,300 | $ 22,400

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- Definition [Line Items] for Asset Retirement Obligations Details [Table] + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Details
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