Commitments and contingencies.

No definition available.

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- Definition

Contractual Obligation, Term

+ References

No definition available.

+ Details

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- Definition

Future undiscounted minimum payments

+ References

No definition available.

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- Definition

Minimum delivery commitment to avoid paying gas deficiency fee.

+ References

No definition available.

+ Details

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- Definition

Natural gas processing and transportation agreement maturity period.

+ References

No definition available.

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- Definition

Payment for Long-term Purchase Commitment

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Cost incurred related to the gas activities, such as transportation, marketing and processing crude oil, natural gas and refined petroleum products.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Balance Type:	debit
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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Best estimate of the loss exposure for a reasonably possible liability for product liability damages for which no accrual has been recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14472-108349

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- Details

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Commitments and Contingencies (Details) - USD ($) $ in Millions			3 Months Ended
	May 02, 2017	Feb. 17, 2017	Mar. 31, 2017	Mar. 31, 2016
Commitments and Contingencies (Textual) [Abstract]
Natural gas processing and transportation agreement			5 years
Minimum delivery commitment to avoid paying gas deficiency fee			80.00%
Transportation and processing fee under the agreement			$ 0.5	$ 0.9
Drilling Rig Commitments
Commitments and Contingencies (Textual) [Abstract]
Maximum termination outstanding obligations of contracts			44.6
Outside Operated Drilling Commitments
Commitments and Contingencies (Textual) [Abstract]
Maximum termination outstanding obligations of contracts			20.8
Eagle Ford Acreage Agreement [Member]
Commitments and Contingencies (Textual) [Abstract]
Future undiscounted minimum payments, minimum			0.6
Loving County System Agreement
Commitments and Contingencies (Textual) [Abstract]
Transportation and processing fee under the agreement			3.2	$ 2.0
Deficiency fee required to be paid			11.7
Capital Addition Purchase Commitments [Member]
Commitments and Contingencies (Textual) [Abstract]
Remaining commitments			40.9
Payment for long-term purchase commitment			$ 2.0
Term Of Old Contract Drilling Rig
Commitments and Contingencies (Textual) [Abstract]
Purchase commitment term			2 years
Corporate Joint Venture [Member] \| San Mateo Midstream [Member]
Commitments and Contingencies (Textual) [Abstract]
Contractual obligation			$ 267.3
Rustler Breaks and Wolf Asset Area [Member] \| Corporate Joint Venture [Member] \| San Mateo Midstream [Member]
Commitments and Contingencies (Textual) [Abstract]
Term of contractual obligation		15 years
Rustler Breaks Asset Area [Member] \| Corporate Joint Venture [Member] \| San Mateo Midstream [Member]
Commitments and Contingencies (Textual) [Abstract]
Term of contractual obligation		15 years
Subsequent Event [Member] \| Capital Addition Purchase Commitments [Member]
Commitments and Contingencies (Textual) [Abstract]
Remaining commitments	$ 38.9