Acquistions (Schedule of Acquisition Fair Value of Net Assets ) (Details) - Central Midland Basin [Member] $ in Thousands	Oct. 08, 2014 USD ($)
Business Acquisition [Line Items]
Oil and natural gas properties	$ 91,895
Asset retirement obligations	(140)
Net assets to be acquired	210,205
Unevaluated Oil and Gas Properties [Member]
Business Acquisition [Line Items]
Oil and natural gas properties	$ 118,450

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Amount of liabilities assumed at the acquisition date.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

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