Area of land held.

No definition available.

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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=31042434&loc=d3e3213-108585

+ Details

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- Definition

The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ 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 (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Acquisitions Acquisition (Details) $ in Thousands					6 Months Ended
Acquisitions Acquisition (Details) $ in Thousands	Aug. 28, 2014 USD ($) a	Jun. 23, 2014 USD ($) a	Jun. 11, 2014 USD ($) a	Feb. 25, 2014 USD ($) a	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Significant Acquisitions and Disposals [Line Items]
Acquisition of mineral interests					$ 0	$ 7,305
Acquisition of oil and natural gas properties					$ 0	$ 6,493
Midland Basin
Significant Acquisitions and Disposals [Line Items]
Area of Land \| a	8,156
Payments to Acquire Property, Plant, and Equipment	$ 192,500
Proved and Unproved Oil and Natural Gas Properties in Glasscock County Texas
Significant Acquisitions and Disposals [Line Items]
Area of Land \| a		24		278
Acquisition of mineral interests				$ 7,300
Acquisition of oil and natural gas properties		$ 1,800
Proved and Unproved Oil and Natural Gas Properties in Reagan County Texas
Significant Acquisitions and Disposals [Line Items]
Area of Land \| a			460
Acquisition of oil and natural gas properties			$ 4,700