Commitments And Contingencies (Details) - Carnero Gathering, Joint Venture $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Earnout derivative liability	$ 6.7
Earnout payments	$ 0.0

The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration