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Asset Retirement Obligations (Narrative) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Asset Retirement Obligation Disclosure [Abstract] |  |
Assets legally restricted for purposes of settling AROs | $ 0 | $ 0

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- References No definition available. + Details
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- Definition Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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