Oil and Natural Gas Properties Acquisitions - Actual and Pro Forma Impact of Noble Acquisition (Details) - Noble Acquisition - USD ($) $ in Millions		12 Months Ended
Nov. 28, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Revenue of acquiree since acquisition date, actual		$ 2.8
Series B Cumulative Convertible Preferred Units
Business Acquisition [Line Items]
Number of shares issued (in shares)	14,711,219

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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