Acquisitions (Fair Value of Net Assets Acquired ) (Details) - Delaware Basin $ in Thousands	Feb. 13, 2017 USD ($)
Business Acquisition [Line Items]
Asset retirement obligations	$ (168)
Net assets acquired	646,559
Evaluated oil and natural gas properties
Business Acquisition [Line Items]
Oil and natural gas properties	137,368
Unevaluated oil and natural gas properties
Business Acquisition [Line Items]
Oil and natural gas properties	$ 509,359

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Amount of liabilities assumed at the acquisition date.

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-Topic 805
-SubTopic 20
-Section 50
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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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The amount of property, plant, and equipment recognized as of the acquisition date.

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