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Asset Retirement Obligations (Narrative) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
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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Namespace Prefix:	us-gaap_
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Period Type:	duration

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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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Balance Type:	debit
Period Type:	instant