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Fixed Assets - Asset Retirement Obligation (Narrative) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Asset Retirement Obligations Details [Line Items] |  |
Asset Retirement Obligation | $ 212,888 | $ 188,662
Accrued Liabilities |  |
Asset Retirement Obligations Details [Line Items] |  |
Asset Retirement Obligation | $ 9,800 |

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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