Subsequent Event (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($) a
2017 Permian Basin Acquisition [Member]
Subsequent Event [Line Items]
Payments for acquisitions	$ 683.5
Net acres \| a	13,000
Permian Basin Acquisition [Member]
Subsequent Event [Line Items]
Payments for acquisitions	$ 38.0
Net acres \| a	700
Additional acquisitions in the Permian Basin [Member]
Subsequent Event [Line Items]
Payments for acquisitions	$ 65.0

Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (a)

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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