Debt Instrument, Redemption, Minimum Required Principal Amount to Remain Outstanding Subsequent to Redemption

No definition available.

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- Definition

Debt Instrument, Redemption Price, Maximum Percentage of Principal Amount Redeemable

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Redemption Requirement, Period of Redemption Within Closing Date

+ References

No definition available.

+ Details

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- Definition

Mineral Interest Area, Developed, Gross

+ References

No definition available.

+ Details

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- Definition

Mineral Interest, Area, Developed, Net

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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Debt - Senior Notes (Details) (USD $)	12 Months Ended
Debt - Senior Notes (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Sep. 18, 2013	Sep. 19, 2013 acre
Senior Notes [Member] \| Senior Unsecured Notes due 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal amount			$ 450,000,000
Stated interest rate	7.625%	7.625%	7.625%
Senior Notes [Member] \| Senior Unsecured Notes due 2021 [Member] \| 12-month period beginning October 1, 2016 [Member]
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	105.719%
Senior Notes [Member] \| Senior Unsecured Notes due 2021 [Member] \| 12-month period beginning October 1, 2017 [Member]
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	103.813%
Senior Notes [Member] \| Senior Unsecured Notes due 2021 [Member] \| 12-month period beginning October 1, 2018 [Member]
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	101.906%
Senior Notes [Member] \| Senior Unsecured Notes due 2021 [Member] \| 12-month period beginning October 1, 2019 and thereafter [Member]
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	100.00%
Make-whole premium option [Member] \| Senior Notes [Member] \| Senior Unsecured Notes due 2021 [Member] \| Period prior to October 1, 2016 [Member]
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	100.00%
Net cash proceeds of certain equity offerings [Member] \| Senior Notes [Member] \| Senior Unsecured Notes due 2021 [Member] \| Period prior to October 1, 2016 [Member]
Debt Instrument [Line Items]
Redemption price, expressed as percentage of principal amount	107.625%
Maximum percent of aggregate principal amount redeemable	35.00%
Minimum required principal amount to remain outstanding subsequent to redemption	65.00%
Number of days within closing date redemption can occur	120 days
Midland County, Texas [Member]
Debt Instrument [Line Items]
Acres of oil and gas property, mineral interest, gross				14,804
Acres of oil and gas property, mineral interest, net				12,687